diff --git a/composer.json b/composer.json
index 03592bc..e085458 100644
--- a/composer.json
+++ b/composer.json
@@ -12,6 +12,10 @@
       {
          "name": "Martin Zurowietz",
          "email": "m.zurowietz@uni-bielefeld.de"
+      },
+      {
+          "name": "Dominik Fladung",
+          "email": "dominik.fladung@gmx.de"
       }
     ],
     "autoload": {
diff --git a/src/Annotation.php b/src/Annotation.php
new file mode 100644
index 0000000..ce083ce
--- /dev/null
+++ b/src/Annotation.php
@@ -0,0 +1,207 @@
+<?php
+
+namespace Biigle\Modules\MetadataCoco;
+
+use Biigle\Shape;
+use Biigle\Label as LabelModel;
+use Biigle\Services\MetadataParsing\Label;
+use Biigle\Services\MetadataParsing\LabelAndUser;
+
+class Annotation
+{
+    public int $id;
+    public int $image_id;
+    public int $category_id;
+    public ?array $bbox;
+    public array $segmentation;
+
+    private ?Shape $shape = null;
+    private ?array $points = null;
+    private ?array $groupedPoints = null;
+
+    public static function create(array $data): self
+    {
+        self::validate($data);
+        $instance = new self();
+        $instance->id = $data['id'];
+        $instance->image_id = $data['image_id'];
+        $instance->category_id = $data['category_id'];
+        $instance->bbox = $data['bbox'] ?? null;
+        $instance->segmentation = $data['segmentation'][0] ?? null;
+
+        return $instance;
+    }
+
+    // Validate the structure
+    public static function validate(array $data): void
+    {
+        $requiredKeys = ['id', 'image_id', 'category_id'];
+        foreach ($requiredKeys as $key) {
+            if (!array_key_exists($key, $data)) {
+                throw new \Exception("Missing key '$key' in Annotation");
+            }
+        }
+    }
+
+    public function getLabel(array $categories): Label
+    {
+        $categoryIndex = array_search($this->category_id, array_column($categories, 'id'));
+        $category = $categories[$categoryIndex];
+        return new Label(id: $category->id, name: $category->name);
+    }
+
+    public function getLabelAndUsers(array $categories): array
+    {
+        $cocoUser = Coco::getCocoUser();
+        $label = $this->getLabel($categories);
+        return [new LabelAndUser(label: $label, user: $cocoUser)];
+    }
+
+    public function getPoints(): array
+    {
+        if ($this->getShape()->id === Shape::circleId()) {
+            return $this->getCirclePoints();
+        }
+        return $this->segmentation;
+    }
+
+    private function getGroupedPoints(): array
+    {
+        if ($this->groupedPoints) {
+            return $this->groupedPoints;
+        }
+        $groupedPoints = [];
+        for ($i = 0; $i < count($this->segmentation); $i += 2) {
+            $groupedPoints[] = ['x' => $this->segmentation[$i], 'y' => $this->segmentation[$i + 1]];
+        }
+        $this->groupedPoints = $groupedPoints;
+        return $groupedPoints;
+    }
+
+    private function getCirclePoints()
+    {
+        if($this->points) {
+            return $this->points;
+        }
+        // Split the coordinates into x, y pairs
+        $points = $this->getGroupedPoints();
+
+        // Calculate the average center (geometric center) of the points
+        $maxY = max(array_column($points, 'y'));
+        $minY = min(array_column($points, 'y'));
+        $maxX = max(array_column($points, 'x'));
+        $minX = min(array_column($points, 'x'));
+        $centerX = ($maxX + $minX) / 2;
+        $centerY = ($maxY + $minY) / 2;
+
+        // Calculate the distance from the first point to the center (radius)
+        $initialRadius = $this->euclidean_distance($points[0]['x'], $points[0]['y'], $centerX, $centerY);
+
+        $this->points = [$centerX, $centerY, $initialRadius];
+        return $this->points;
+    }
+
+    private function detectShape(): Shape
+    {
+        if (count($this->segmentation) < 2) {
+            return Shape::polygon();
+        }
+
+        if ($this->isPointShape()) {
+            return Shape::point();
+        }
+
+        if ($this->isRectangleShape()) {
+            return Shape::rectangle();
+        }
+
+        if ($this->isLineShape()) {
+            return Shape::line();
+        }
+
+        if ($this->isCircleShape()) {
+            return Shape::circle();
+        }
+
+        return Shape::polygon();
+    }
+
+    public function getShape(): Shape
+    {
+        if (!$this->shape) {
+            $this->shape = $this->detectShape();
+        }
+
+        return $this->shape;
+    }
+
+    public function isPointShape(): bool
+    {
+        return count($this->segmentation) === 2;
+    }
+
+    public function isLineShape(): bool
+    {
+        $segmentationCount = count($this->segmentation);
+        if ($segmentationCount < 4) {
+            return false;
+        }
+
+        $x_1 = $this->segmentation[0];
+        $y_1 = $this->segmentation[1];
+        $x_last = $this->segmentation[$segmentationCount - 2];
+        $y_last = $this->segmentation[$segmentationCount - 1];
+
+        return !($x_1 === $x_last && $y_1 === $y_last);
+    }
+
+    public function isCircleShape(): bool
+    {
+        // Tolerance for floating-point comparison
+        $tolerance = 0.001;
+        $points = $this->getGroupedPoints();
+        list($centerX, $centerY, $initialRadius) = $this->getCirclePoints();
+
+        // Check if all points are equidistant from the center
+        foreach ($points as $point) {
+            $radius = $this->euclidean_distance($point['x'], $point['y'], $centerX, $centerY);
+            if (abs($radius - $initialRadius) > $tolerance) {
+                return false;
+            }
+        }
+
+        // If all points are within the tolerance range, they form a circle
+        return true;
+    }
+
+    function euclidean_distance($x1, $y1, $x2, $y2)
+    {
+        return sqrt(pow($x2 - $x1, 2) + pow($y2 - $y1, 2));
+    }
+
+    public function isRectangleShape(): bool
+    {
+        if (count($this->segmentation) !== 8) {
+            return false;
+        }
+
+        // Toleranz für Gleitkomma-Vergleiche
+        $tolerance = 0.01;
+
+        // Punkte (x1, y1), (x2, y2), (x3, y3), (x4, y4)
+        list($x1, $y1, $x2, $y2, $x3, $y3, $x4, $y4) = $this->segmentation;
+
+        // Berechne die Seitenlängen
+        $d1 = $this->euclidean_distance($x1, $y1, $x2, $y2); // Distanz zwischen P1 und P2
+        $d2 = $this->euclidean_distance($x2, $y2, $x3, $y3); // Distanz zwischen P2 und P3
+        $d3 = $this->euclidean_distance($x3, $y3, $x4, $y4); // Distanz zwischen P3 und P4
+        $d4 = $this->euclidean_distance($x4, $y4, $x1, $y1); // Distanz zwischen P4 und P1
+
+        // Berechne die Diagonalen
+        $diag1 = $this->euclidean_distance($x1, $y1, $x3, $y3); // Diagonale P1 -> P3
+        $diag2 = $this->euclidean_distance($x2, $y2, $x4, $y4); // Diagonale P2 -> P4
+
+        // Prüfen, ob gegenüberliegende Seiten gleich lang sind und Diagonalen gleich lang sind
+        return abs($d1 - $d3) < $tolerance && abs($d2 - $d4) < $tolerance && abs($diag1 - $diag2) < $tolerance;
+    }
+}
diff --git a/src/Category.php b/src/Category.php
new file mode 100644
index 0000000..013cc11
--- /dev/null
+++ b/src/Category.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Biigle\Modules\MetadataCoco;
+
+class Category
+{
+    public int $id;
+    public string $name;
+
+    // Static create method from JSON
+    public static function create(array $data): self
+    {
+        self::validate($data);
+        $instance = new self();
+        $instance->id = $data['id'];
+        $instance->name = $data['name'];
+
+        return $instance;
+    }
+
+    // Validate the structure
+    public static function validate(array $data): void
+    {
+        $requiredKeys = ['id', 'name'];
+        foreach ($requiredKeys as $key) {
+            if (!array_key_exists($key, $data)) {
+                throw new \Exception("Missing key '$key' in Category");
+            }
+        }
+    }
+}
diff --git a/src/Coco.php b/src/Coco.php
new file mode 100644
index 0000000..74179f3
--- /dev/null
+++ b/src/Coco.php
@@ -0,0 +1,101 @@
+<?php
+
+namespace Biigle\Modules\MetadataCoco;
+
+use Biigle\Services\MetadataParsing\User;
+
+class Coco
+{
+    public Info $info;
+    public array $images;
+    public array $annotations;
+    public array $categories;
+
+    public static function getCocoUser(): User
+    {
+        return new User(
+            id: 1,
+            name: 'COCO Import',
+            uuid: null
+        );
+    }
+
+    public static function createFromPath(string $path): self
+    {
+        $data = file_get_contents($path);
+        $data = json_decode($data, true);
+        return self::create($data);
+    }
+
+    // Static create method from JSON
+    public static function create(array $data): self
+    {
+        $instance = new self();
+
+        // Validate top-level structure
+        self::validate($data);
+
+        // Create the Info object
+        if (array_key_exists('info', $data)) {
+            $instance->info = Info::create($data['info']);
+        }
+
+        // Create the Image objects
+        $instance->images = array_map(function ($imageData) {
+            return Image::create($imageData);
+        }, $data['images']);
+
+        // Create the Annotation objects
+        $instance->annotations = array_map(function ($annotationData) {
+            return Annotation::create($annotationData);
+        }, $data['annotations']);
+
+        // Create the Category objects
+        $instance->categories = array_map(function ($categoryData) {
+            return Category::create($categoryData);
+        }, $data['categories']);
+
+        // validate the data consistency
+        $instance->validateCategoriesInData();
+        $instance->validateImagesInData();
+
+        return $instance;
+    }
+
+    // Validate the top-level structure
+    public static function validate(array $data): void
+    {
+        $requiredKeys = ['images', 'annotations', 'categories'];
+        foreach ($requiredKeys as $key) {
+            if (!array_key_exists($key, $data)) {
+                throw new \Exception("Missing key '$key' in Coco");
+            }
+        }
+    }
+
+    public function validateCategoriesInData(): void
+    {
+        $categoryIds = array_map(function ($category) {
+            return $category->id;
+        }, $this->categories);
+
+        foreach ($this->annotations as $annotation) {
+            if (!in_array($annotation->category_id, $categoryIds)) {
+                throw new \Exception("Invalid category ID '{$annotation['category_id']}' in annotation '{$annotation['id']}'");
+            }
+        }
+    }
+
+    public function validateImagesInData(): void
+    {
+        $imageIds = array_map(function ($image) {
+            return $image->id;
+        }, $this->images);
+
+        foreach ($this->annotations as $annotation) {
+            if (!in_array($annotation->image_id, $imageIds)) {
+                throw new \Exception("Invalid image ID '{$annotation['image_id']}' in annotation '{$annotation['id']}'");
+            }
+        }
+    }
+}
diff --git a/src/CocoParser.php b/src/CocoParser.php
index 94b9e59..c7b7505 100644
--- a/src/CocoParser.php
+++ b/src/CocoParser.php
@@ -1,15 +1,24 @@
 <?php
+
 namespace Biigle\Modules\MetadataCoco;
 
+use Biigle\MediaType;
 use Biigle\Services\MetadataParsing\MetadataParser;
 use Biigle\Services\MetadataParsing\VolumeMetadata;
+use Biigle\Services\MetadataParsing\ImageAnnotation;
+use Biigle\Services\MetadataParsing\ImageMetadata;
+use Biigle\Modules\MetadataCoco\Coco;
+use Biigle\Modules\MetadataCoco\Image;
 
 class CocoParser extends MetadataParser
 {
+    private $coco = null;
+
     /**
      * {@inheritdoc}
      */
-    public static function getKnownMimeTypes(): array {
+    public static function getKnownMimeTypes(): array
+    {
         return [
             'application/json',
         ];
@@ -23,12 +32,28 @@ public static function getName(): string
         return "COCO";
     }
 
+    private function getCoco(): Coco
+    {
+        if (!$this->coco) {
+            $file       = parent::getFileObject();
+            $this->coco = Coco::createFromPath($file->getRealPath());
+        }
+
+        return $this->coco;
+    }
+
     /**
      * {@inheritdoc}
      */
     public function recognizesFile(): bool
     {
-        // TODO
+        try {
+            $this->getCoco();
+        } catch (\Exception $e) {
+            return false;
+        }
+
+        return true;
     }
 
     /**
@@ -36,6 +61,41 @@ public function recognizesFile(): bool
      */
     public function getMetadata(): VolumeMetadata
     {
-        // TODO
+        $coco = $this->getCoco();
+
+        $metadata = new VolumeMetadata(
+            type: MediaType::image(),
+            name: $coco->info->description ?? null,
+            url: null,
+            handle: null,
+        );
+
+        foreach ($coco->images as $image) {
+            $imageMetaData = new ImageMetadata(
+                name: $image->file_name
+            );
+
+            $this->processImageAnnotations($image, $imageMetaData);
+
+            $metadata->addFile($imageMetaData);
+        }
+
+        return $metadata;
+    }
+
+    private function processImageAnnotations(Image $image, ImageMetadata $imageMetaData)
+    {
+        $annotations = array_filter($this->getCoco()->annotations, function ($annotation) use ($image) {
+            return $annotation->image_id === $image->id;
+        });
+
+        foreach ($annotations as $annotation) {
+            $metaDataAnnotation = new ImageAnnotation(
+                shape: $annotation->getShape(),
+                points: $annotation->getPoints(),
+                labels: $annotation->getLabelAndUsers($this->getCoco()->categories),
+            );
+            $imageMetaData->addAnnotation($metaDataAnnotation);
+        }
     }
 }
diff --git a/src/Image.php b/src/Image.php
new file mode 100644
index 0000000..6bda21c
--- /dev/null
+++ b/src/Image.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Biigle\Modules\MetadataCoco;
+
+class Image
+{
+    public int $id;
+    public int $width;
+    public int $height;
+    public string $file_name;
+    public ?int $license = null;
+    public ?string $flickr_url;
+    public ?string $coco_url;
+
+    public ?string $date_captured;
+
+    // Static create method from JSON
+    public static function create(array $data): self
+    {
+        self::validate($data);
+        $instance = new self();
+        $instance->id = $data['id'];
+        $instance->width = $data['width'];
+        $instance->height = $data['height'];
+        $instance->file_name = $data['file_name'];
+        $instance->license = $data['license'] ?? null;
+        $instance->flickr_url = $data['flickr_url'] ?? null;
+        $instance->coco_url = $data['coco_url'] ?? null;
+        $instance->date_captured = $data['date_captured'] ?? null;
+
+        return $instance;
+    }
+
+    // Validate the structure
+    public static function validate(array $data): void
+    {
+        $requiredKeys = ['id', 'width', 'height', 'file_name'];
+        foreach ($requiredKeys as $key) {
+            if (!array_key_exists($key, $data)) {
+                throw new \Exception("Missing key '$key' in Image");
+            }
+        }
+    }
+}
diff --git a/src/Info.php b/src/Info.php
new file mode 100644
index 0000000..daca85c
--- /dev/null
+++ b/src/Info.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Biigle\Modules\MetadataCoco;
+
+class Info
+{
+    public ?int $year;
+    public ?string $version;
+    public ?string $description;
+    public ?string $contributor;
+    public ?string $url;
+    public ?string $date_created;
+
+    // Static create method from JSON
+    public static function create(array $data): self
+    {
+        $instance = new self();
+        $instance->year = $data['year'] ?? null;
+        $instance->version = $data['version'] ?? null;
+        $instance->description = $data['description'] ?? null;
+        $instance->contributor = $data['contributor'] ?? null;
+        $instance->url = $data['url'] ?? null;
+        $instance->date_created = $data['date_created'] ?? null;
+
+        return $instance;
+    }
+}
diff --git a/tests/CocoParserTest.php b/tests/CocoParserTest.php
index 997185b..bb49dc2 100644
--- a/tests/CocoParserTest.php
+++ b/tests/CocoParserTest.php
@@ -1,17 +1,311 @@
 <?php
+
 namespace Biigle\Tests\Modules\MetadataCoco;
 
+use Symfony\Component\HttpFoundation\File\File;
+use Biigle\MediaType;
+use Biigle\Shape;
+use Biigle\Modules\MetadataCoco\Annotation;
+use Biigle\Modules\MetadataCoco\Coco;
+use Biigle\Modules\MetadataCoco\CocoParser;
+
 use TestCase;
 
 class CocoParserTest extends TestCase
 {
-    public function testRecognizesFile()
+    public function testRecognizesCorrectFile()
+    {
+        $file   = new File(__DIR__ . "/files/full-coco-import-volume.json");
+        $parser = new CocoParser($file);
+        $this->assertTrue($parser->recognizesFile());
+    }
+
+    public function testRecognizesCorrectFileWithAdditionalData()
     {
-        //
+        $file   = new File(__DIR__ . "/files/additional-data-coco-import-volume.json");
+        $parser = new CocoParser($file);
+        $this->assertTrue($parser->recognizesFile());
+    }
+
+    public function testRecognizesMissingCategoryFile()
+    {
+        $file   = new File(__DIR__ . "/files/missing-category-coco-import-volume.json");
+        $parser = new CocoParser($file);
+        $this->assertFalse($parser->recognizesFile());
+    }
+
+    public function testRecognizesEmptyFile()
+    {
+        $file   = new File(__DIR__ . "/files/empty.json");
+        $parser = new CocoParser($file);
+        $this->assertFalse($parser->recognizesFile());
     }
 
     public function testGetMetadata()
     {
-        //
+        $file   = new File(__DIR__ . "/files/full-coco-import-volume.json");
+        $parser = new CocoParser($file);
+        $metadata = $parser->getMetadata();
+
+        $this->assertSame(MediaType::imageId(), $metadata->type->id);
+        $this->assertSame("COCO 2017 Volume", $metadata->name);
+        $this->assertNull($metadata->url);
+        $this->assertNull($metadata->handle);
+
+        $this->assertCount(1, $metadata->getFiles());
+
+        $file = $metadata->getFiles()->first();
+        $this->assertSame("31c3-Wimmelbild-ccby.jpg", $file->name);
+        $this->assertSame(null, $file->lng);
+        $this->assertSame(null, $file->lat);
+
+        $this->assertTrue($metadata->hasAnnotations());
+
+        $annotations = $file->getAnnotations();
+        $this->assertCount(6, $annotations);
+        $this->assertSame(Shape::rectangle(), $annotations[0]->shape);
+        $this->assertSame(Shape::circle(), $annotations[1]->shape);
+        $this->assertSame(Shape::line(), $annotations[2]->shape);
+        $this->assertSame(Shape::polygon(), $annotations[3]->shape);
+        $this->assertSame(Shape::rectangle(), $annotations[4]->shape);
+        $this->assertSame(Shape::polygon(), $annotations[5]->shape);
+
+        $this->assertSame($annotations[0]->points, [
+            1853.22,
+            596.22,
+            1776.16,
+            799.04,
+            1597.21,
+            731.04,
+            1674.27,
+            528.23
+        ]);
+
+        $users = $file->getUsers();
+        $cocoUser = Coco::getCocoUser();
+        $this->assertCount(1, $users);
+        $this->assertSame($cocoUser->name, $users[array_key_first($users)]->name);
+
+        $labels = $file->getAnnotationLabels();
+        $this->assertCount(1, $labels);
+        $this->assertSame("Animal", $labels[array_key_first($labels)]->name);
+
+        $this->assertSame("Animal", $annotations[0]->labels[0]->label->name);
+        $this->assertSame("Animal", $annotations[1]->labels[0]->label->name);
+        $this->assertSame("Animal", $annotations[2]->labels[0]->label->name);
+        $this->assertSame("Animal", $annotations[3]->labels[0]->label->name);
+        $this->assertSame("Animal", $annotations[4]->labels[0]->label->name);
+        $this->assertSame("Animal", $annotations[5]->labels[0]->label->name);
+    }
+
+    public function testIsPointShape()
+    {
+        $pointAnnotation = Annotation::create([
+            'id' => 1,
+            'image_id' => 1,
+            'category_id' => 1,
+            'bbox' => null,
+            'segmentation' => [[1, 1]]
+        ]);
+        $this->assertTrue($pointAnnotation->isPointShape());
+        $this->assertSame($pointAnnotation->getShape(), Shape::point());
+    }
+
+    public function testIsRectangleShape()
+    {
+        $rectangleAnnotation = Annotation::create([
+            'id' => 1,
+            'image_id' => 1,
+            'category_id' => 1,
+            'bbox' => null,
+            'segmentation' => [
+                [
+                    1853.22,
+                    596.22,
+
+                    1776.16,
+                    799.04,
+
+                    1597.21,
+                    731.04,
+
+                    1674.27,
+                    528.23
+                ]
+            ],
+        ]);
+        $this->assertTrue($rectangleAnnotation->isRectangleShape());
+        $this->assertSame($rectangleAnnotation->getShape(), Shape::rectangle());
+        $this->assertSame($rectangleAnnotation->getPoints(), $rectangleAnnotation->segmentation);
+    }
+
+    public function testIsCircleShape()
+    {
+        $circleAnnotation = Annotation::create([
+            'id' => 1,
+            'image_id' => 1,
+            'category_id' => 1,
+            'bbox' => null,
+            'segmentation' => [[
+                1474.3300000000002,
+                1165.54,
+                1473.8187624307873,
+                1155.1335202112105,
+                1472.289973220411,
+                1144.8272605115476,
+                1469.7583554446887,
+                1134.7204758158937,
+                1466.2482899667234,
+                1124.9104999857984,
+                1461.793580635865,
+                1115.4918084511837,
+                1456.4371287381614,
+                1106.5551083603089,
+                1450.2305198335218,
+                1098.1864650203456,
+                1443.2335269585758,
+                1090.4664730414243,
+                1435.5135349796544,
+                1083.4694801664782,
+                1427.1448916396912,
+                1077.2628712618387,
+                1418.2081915488163,
+                1071.9064193641352,
+                1408.7895000142016,
+                1067.4517100332766,
+                1398.9795241841064,
+                1063.9416445553113,
+                1388.8727394884525,
+                1061.410026779589,
+                1378.5664797887896,
+                1059.8812375692128,
+                1368.16,
+                1059.37,
+                1357.7535202112106,
+                1059.8812375692128,
+                1347.4472605115477,
+                1061.410026779589,
+                1337.3404758158938,
+                1063.9416445553113,
+                1327.5304999857985,
+                1067.4517100332766,
+                1318.1118084511838,
+                1071.9064193641352,
+                1309.175108360309,
+                1077.2628712618387,
+                1300.806465020346,
+                1083.4694801664782,
+                1293.0864730414244,
+                1090.4664730414243,
+                1286.0894801664783,
+                1098.1864650203456,
+                1279.8828712618388,
+                1106.5551083603089,
+                1274.5264193641353,
+                1115.4918084511837,
+                1270.0717100332768,
+                1124.9104999857984,
+                1266.5616445553114,
+                1134.7204758158937,
+                1264.0300267795892,
+                1144.8272605115476,
+                1262.501237569213,
+                1155.1335202112105,
+                1261.99,
+                1165.54,
+                1262.501237569213,
+                1175.9464797887895,
+                1264.0300267795892,
+                1186.2527394884523,
+                1266.5616445553114,
+                1196.3595241841062,
+                1270.0717100332768,
+                1206.1695000142015,
+                1274.526419364135,
+                1215.5881915488162,
+                1279.8828712618388,
+                1224.524891639691,
+                1286.0894801664783,
+                1232.893534979654,
+                1293.0864730414244,
+                1240.6135269585757,
+                1300.8064650203457,
+                1247.6105198335217,
+                1309.175108360309,
+                1253.8171287381613,
+                1318.1118084511838,
+                1259.1735806358647,
+                1327.5304999857985,
+                1263.6282899667233,
+                1337.3404758158938,
+                1267.1383554446886,
+                1347.4472605115477,
+                1269.6699732204108,
+                1357.7535202112106,
+                1271.1987624307872,
+                1368.16,
+                1271.71,
+                1378.5664797887894,
+                1271.1987624307872,
+                1388.8727394884525,
+                1269.6699732204108,
+                1398.9795241841064,
+                1267.1383554446886,
+                1408.7895000142016,
+                1263.6282899667233,
+                1418.2081915488163,
+                1259.1735806358647,
+                1427.1448916396912,
+                1253.8171287381613,
+                1435.5135349796544,
+                1247.6105198335217,
+                1443.2335269585758,
+                1240.6135269585757,
+                1450.2305198335218,
+                1232.8935349796543,
+                1456.4371287381614,
+                1224.524891639691,
+                1461.7935806358648,
+                1215.5881915488162,
+                1466.2482899667234,
+                1206.1695000142015,
+                1469.7583554446887,
+                1196.3595241841062,
+                1472.289973220411,
+                1186.2527394884523,
+                1473.8187624307873,
+                1175.9464797887895,
+                1474.3300000000002,
+                1165.54
+            ]]
+        ]);
+        $this->assertTrue($circleAnnotation->isCircleShape());
+        $this->assertSame($circleAnnotation->getShape(), Shape::circle());
+        $this->assertSame($circleAnnotation->getPoints(), [1368.16, 1165.54, 106.17000000000007]);
+    }
+
+    public function testIsLineShape()
+    {
+        $lineAnnotation = Annotation::create([
+            'id' => 1,
+            'image_id' => 1,
+            'category_id' => 1,
+            'bbox' => null,
+            'segmentation' => [[1, 1, 2, 2, 3, 3, 2, 2]]
+        ]);
+        $this->assertTrue($lineAnnotation->isLineShape());
+        $this->assertSame($lineAnnotation->getShape(), Shape::line());
+    }
+
+    public function testIsPolygonShape()
+    {
+        $polygonAnnotation = Annotation::create([
+            'id' => 1,
+            'image_id' => 1,
+            'category_id' => 1,
+            'bbox' => null,
+            'segmentation' => [[1, 1, 2, 2, 3, 3, 4, 4, 1, 1]]
+        ]);
+        $this->assertSame($polygonAnnotation->getShape(), Shape::polygon());
     }
 }
diff --git a/tests/files/additional-data-coco-import-volume.json b/tests/files/additional-data-coco-import-volume.json
new file mode 100644
index 0000000..6ba2b69
--- /dev/null
+++ b/tests/files/additional-data-coco-import-volume.json
@@ -0,0 +1,681 @@
+{
+    "foo": "bar",
+    "images": [
+        {
+            "height": 1775,
+            "width": 2500,
+            "id": 5588064,
+            "file_name": "31c3-Wimmelbild-ccby.jpg",
+            "longitude": null,
+            "latitude": null
+        }
+    ],
+    "categories": [
+        {
+            "id": 15,
+            "name": "Animal"
+        }
+    ],
+    "annotations": [
+        {
+            "segmentation": [
+                [
+                    1853.22,
+                    596.22,
+                    1776.16,
+                    799.04,
+                    1597.21,
+                    731.04,
+                    1674.27,
+                    528.23
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 69330.06809999999,
+            "image_id": 5588064,
+            "bbox": [
+                1597.21,
+                528.23,
+                256.01,
+                270.80999999999995
+            ],
+            "category_id": 15,
+            "id": 38917020
+        },
+        {
+            "segmentation": [
+                [
+                    1474.3300000000002,
+                    1165.54,
+                    1473.8187624307873,
+                    1155.1335202112105,
+                    1472.289973220411,
+                    1144.8272605115476,
+                    1469.7583554446887,
+                    1134.7204758158937,
+                    1466.2482899667234,
+                    1124.9104999857984,
+                    1461.793580635865,
+                    1115.4918084511837,
+                    1456.4371287381614,
+                    1106.5551083603089,
+                    1450.2305198335218,
+                    1098.1864650203456,
+                    1443.2335269585758,
+                    1090.4664730414243,
+                    1435.5135349796544,
+                    1083.4694801664782,
+                    1427.1448916396912,
+                    1077.2628712618387,
+                    1418.2081915488163,
+                    1071.9064193641352,
+                    1408.7895000142016,
+                    1067.4517100332766,
+                    1398.9795241841064,
+                    1063.9416445553113,
+                    1388.8727394884525,
+                    1061.410026779589,
+                    1378.5664797887896,
+                    1059.8812375692128,
+                    1368.16,
+                    1059.37,
+                    1357.7535202112106,
+                    1059.8812375692128,
+                    1347.4472605115477,
+                    1061.410026779589,
+                    1337.3404758158938,
+                    1063.9416445553113,
+                    1327.5304999857985,
+                    1067.4517100332766,
+                    1318.1118084511838,
+                    1071.9064193641352,
+                    1309.175108360309,
+                    1077.2628712618387,
+                    1300.806465020346,
+                    1083.4694801664782,
+                    1293.0864730414244,
+                    1090.4664730414243,
+                    1286.0894801664783,
+                    1098.1864650203456,
+                    1279.8828712618388,
+                    1106.5551083603089,
+                    1274.5264193641353,
+                    1115.4918084511837,
+                    1270.0717100332768,
+                    1124.9104999857984,
+                    1266.5616445553114,
+                    1134.7204758158937,
+                    1264.0300267795892,
+                    1144.8272605115476,
+                    1262.501237569213,
+                    1155.1335202112105,
+                    1261.99,
+                    1165.54,
+                    1262.501237569213,
+                    1175.9464797887895,
+                    1264.0300267795892,
+                    1186.2527394884523,
+                    1266.5616445553114,
+                    1196.3595241841062,
+                    1270.0717100332768,
+                    1206.1695000142015,
+                    1274.526419364135,
+                    1215.5881915488162,
+                    1279.8828712618388,
+                    1224.524891639691,
+                    1286.0894801664783,
+                    1232.893534979654,
+                    1293.0864730414244,
+                    1240.6135269585757,
+                    1300.8064650203457,
+                    1247.6105198335217,
+                    1309.175108360309,
+                    1253.8171287381613,
+                    1318.1118084511838,
+                    1259.1735806358647,
+                    1327.5304999857985,
+                    1263.6282899667233,
+                    1337.3404758158938,
+                    1267.1383554446886,
+                    1347.4472605115477,
+                    1269.6699732204108,
+                    1357.7535202112106,
+                    1271.1987624307872,
+                    1368.16,
+                    1271.71,
+                    1378.5664797887894,
+                    1271.1987624307872,
+                    1388.8727394884525,
+                    1269.6699732204108,
+                    1398.9795241841064,
+                    1267.1383554446886,
+                    1408.7895000142016,
+                    1263.6282899667233,
+                    1418.2081915488163,
+                    1259.1735806358647,
+                    1427.1448916396912,
+                    1253.8171287381613,
+                    1435.5135349796544,
+                    1247.6105198335217,
+                    1443.2335269585758,
+                    1240.6135269585757,
+                    1450.2305198335218,
+                    1232.8935349796543,
+                    1456.4371287381614,
+                    1224.524891639691,
+                    1461.7935806358648,
+                    1215.5881915488162,
+                    1466.2482899667234,
+                    1206.1695000142015,
+                    1469.7583554446887,
+                    1196.3595241841062,
+                    1472.289973220411,
+                    1186.2527394884523,
+                    1473.8187624307873,
+                    1175.9464797887895,
+                    1474.3300000000002,
+                    1165.54
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 45088.27560000006,
+            "image_id": 5588064,
+            "bbox": [
+                1261.99,
+                1059.37,
+                212.34000000000015,
+                212.34000000000015
+            ],
+            "category_id": 15,
+            "id": 38917021
+        },
+        {
+            "segmentation": [
+                [
+                    957.16,
+                    1368.35,
+                    731.11,
+                    1465.91,
+                    623.23,
+                    1327.28
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 46292.71590000003,
+            "image_id": 5588064,
+            "bbox": [
+                623.23,
+                1327.28,
+                333.92999999999995,
+                138.6300000000001
+            ],
+            "category_id": 15,
+            "id": 38917022
+        },
+        {
+            "segmentation": [
+                [
+                    2030.9,
+                    1060.28,
+                    1707.24,
+                    1304.17,
+                    2038.6,
+                    1478.75,
+                    2303.18,
+                    1268.23,
+                    2277.5,
+                    944.75,
+                    2107.96,
+                    862.6,
+                    2030.9,
+                    1060.28
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 367188.43099999987,
+            "image_id": 5588064,
+            "bbox": [
+                1707.24,
+                862.6,
+                595.9399999999998,
+                616.15
+            ],
+            "category_id": 15,
+            "id": 38917023
+        },
+        {
+            "segmentation": [
+                [
+                    828.73,
+                    261.85,
+                    828.73,
+                    580.19,
+                    1357.89,
+                    580.19,
+                    1357.89,
+                    261.85
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 168452.79440000004,
+            "image_id": 5588064,
+            "bbox": [
+                828.73,
+                261.85,
+                529.1600000000001,
+                318.34000000000003
+            ],
+            "category_id": 15,
+            "id": 38917024
+        },
+        {
+            "segmentation": [
+                [
+                    625,
+                    1022.95,
+                    634.77,
+                    1022.95,
+                    639.65,
+                    1027.83,
+                    642.09,
+                    1027.83,
+                    656.74,
+                    1042.48,
+                    659.18,
+                    1042.48,
+                    664.06,
+                    1047.36,
+                    666.5,
+                    1047.36,
+                    671.39,
+                    1052.25,
+                    673.83,
+                    1052.25,
+                    681.15,
+                    1059.57,
+                    683.59,
+                    1059.57,
+                    688.48,
+                    1064.45,
+                    690.92,
+                    1064.45,
+                    695.8,
+                    1069.34,
+                    698.24,
+                    1069.34,
+                    700.68,
+                    1071.78,
+                    703.13,
+                    1071.78,
+                    703.13,
+                    1074.22,
+                    705.57,
+                    1076.66,
+                    705.57,
+                    1091.31,
+                    703.13,
+                    1093.75,
+                    703.13,
+                    1098.63,
+                    705.57,
+                    1101.07,
+                    717.77,
+                    1101.07,
+                    725.1,
+                    1093.75,
+                    727.54,
+                    1096.19,
+                    727.54,
+                    1098.63,
+                    729.98,
+                    1101.07,
+                    729.98,
+                    1105.96,
+                    734.86,
+                    1110.84,
+                    742.19,
+                    1103.52,
+                    747.07,
+                    1103.52,
+                    754.39,
+                    1110.84,
+                    756.84,
+                    1110.84,
+                    761.72,
+                    1115.72,
+                    764.16,
+                    1115.72,
+                    766.6,
+                    1118.16,
+                    769.04,
+                    1118.16,
+                    776.37,
+                    1125.49,
+                    778.81,
+                    1125.49,
+                    791.02,
+                    1137.7,
+                    793.46,
+                    1137.7,
+                    795.9,
+                    1140.14,
+                    798.34,
+                    1140.14,
+                    805.66,
+                    1147.46,
+                    803.22,
+                    1149.9,
+                    803.22,
+                    1162.11,
+                    791.02,
+                    1162.11,
+                    788.57,
+                    1164.55,
+                    781.25,
+                    1164.55,
+                    778.81,
+                    1166.99,
+                    776.37,
+                    1166.99,
+                    773.93,
+                    1169.43,
+                    771.48,
+                    1169.43,
+                    769.04,
+                    1171.88,
+                    766.6,
+                    1171.88,
+                    761.72,
+                    1176.76,
+                    761.72,
+                    1179.2,
+                    759.28,
+                    1181.64,
+                    759.28,
+                    1186.52,
+                    756.84,
+                    1188.96,
+                    756.84,
+                    1196.29,
+                    754.39,
+                    1198.73,
+                    754.39,
+                    1203.61,
+                    747.07,
+                    1210.94,
+                    744.63,
+                    1210.94,
+                    739.75,
+                    1215.82,
+                    737.3,
+                    1215.82,
+                    725.1,
+                    1228.03,
+                    722.66,
+                    1228.03,
+                    698.24,
+                    1252.44,
+                    695.8,
+                    1252.44,
+                    693.36,
+                    1254.88,
+                    693.36,
+                    1257.32,
+                    690.92,
+                    1259.77,
+                    690.92,
+                    1296.39,
+                    693.36,
+                    1298.83,
+                    693.36,
+                    1308.59,
+                    690.92,
+                    1311.04,
+                    686.04,
+                    1311.04,
+                    686.04,
+                    1308.59,
+                    681.15,
+                    1303.71,
+                    681.15,
+                    1264.65,
+                    678.71,
+                    1262.21,
+                    678.71,
+                    1259.77,
+                    671.39,
+                    1252.44,
+                    668.95,
+                    1252.44,
+                    659.18,
+                    1242.68,
+                    656.74,
+                    1242.68,
+                    651.86,
+                    1247.56,
+                    651.86,
+                    1286.62,
+                    654.3,
+                    1289.06,
+                    654.3,
+                    1296.39,
+                    649.41,
+                    1301.27,
+                    646.97,
+                    1301.27,
+                    639.65,
+                    1293.95,
+                    639.65,
+                    1291.5,
+                    637.21,
+                    1289.06,
+                    629.88,
+                    1289.06,
+                    627.44,
+                    1286.62,
+                    627.44,
+                    1267.09,
+                    625,
+                    1264.65,
+                    625,
+                    1257.32,
+                    627.44,
+                    1254.88,
+                    625,
+                    1252.44,
+                    625,
+                    1247.56,
+                    622.56,
+                    1245.12,
+                    622.56,
+                    1235.35,
+                    620.12,
+                    1232.91,
+                    620.12,
+                    1220.7,
+                    615.23,
+                    1215.82,
+                    612.79,
+                    1215.82,
+                    610.35,
+                    1213.38,
+                    607.91,
+                    1213.38,
+                    605.47,
+                    1210.94,
+                    603.03,
+                    1210.94,
+                    598.14,
+                    1206.05,
+                    595.7,
+                    1206.05,
+                    595.7,
+                    1186.52,
+                    600.59,
+                    1181.64,
+                    605.47,
+                    1181.64,
+                    612.79,
+                    1174.32,
+                    612.79,
+                    1171.88,
+                    610.35,
+                    1169.43,
+                    610.35,
+                    1166.99,
+                    603.03,
+                    1159.67,
+                    603.03,
+                    1157.23,
+                    595.7,
+                    1149.9,
+                    588.38,
+                    1149.9,
+                    581.05,
+                    1157.23,
+                    581.05,
+                    1159.67,
+                    576.17,
+                    1164.55,
+                    576.17,
+                    1166.99,
+                    571.29,
+                    1171.88,
+                    563.96,
+                    1171.88,
+                    561.52,
+                    1169.43,
+                    554.2,
+                    1169.43,
+                    554.2,
+                    1166.99,
+                    546.88,
+                    1159.67,
+                    544.43,
+                    1159.67,
+                    539.55,
+                    1154.79,
+                    532.23,
+                    1154.79,
+                    529.79,
+                    1157.23,
+                    529.79,
+                    1171.88,
+                    532.23,
+                    1174.32,
+                    532.23,
+                    1208.5,
+                    524.9,
+                    1208.5,
+                    522.46,
+                    1206.05,
+                    522.46,
+                    1193.85,
+                    520.02,
+                    1191.41,
+                    520.02,
+                    1171.88,
+                    517.58,
+                    1169.43,
+                    517.58,
+                    1157.23,
+                    515.14,
+                    1154.79,
+                    515.14,
+                    1140.14,
+                    512.7,
+                    1137.7,
+                    512.7,
+                    1130.37,
+                    510.25,
+                    1127.93,
+                    510.25,
+                    1125.49,
+                    512.7,
+                    1123.05,
+                    512.7,
+                    1118.16,
+                    527.34,
+                    1103.52,
+                    529.79,
+                    1103.52,
+                    544.43,
+                    1088.87,
+                    546.88,
+                    1088.87,
+                    549.32,
+                    1086.43,
+                    551.76,
+                    1086.43,
+                    554.2,
+                    1083.98,
+                    566.41,
+                    1083.98,
+                    568.85,
+                    1086.43,
+                    573.73,
+                    1086.43,
+                    576.17,
+                    1088.87,
+                    581.05,
+                    1088.87,
+                    588.38,
+                    1081.54,
+                    588.38,
+                    1076.66,
+                    590.82,
+                    1074.22,
+                    593.26,
+                    1076.66,
+                    598.14,
+                    1076.66,
+                    603.03,
+                    1071.78,
+                    603.03,
+                    1066.89,
+                    600.59,
+                    1064.45,
+                    593.26,
+                    1064.45,
+                    590.82,
+                    1062.01,
+                    588.38,
+                    1062.01,
+                    585.94,
+                    1059.57,
+                    585.94,
+                    1057.13,
+                    588.38,
+                    1054.69,
+                    590.82,
+                    1054.69,
+                    593.26,
+                    1052.25,
+                    595.7,
+                    1052.25,
+                    600.59,
+                    1047.36,
+                    600.59,
+                    1040.04,
+                    610.35,
+                    1030.27,
+                    617.68,
+                    1030.27,
+                    625,
+                    1022.95
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 85104.66689999997,
+            "image_id": 5588064,
+            "bbox": [
+                510.25,
+                1022.95,
+                295.40999999999997,
+                288.0899999999999
+            ],
+            "category_id": 15,
+            "id": 38917025
+        }
+    ]
+}
\ No newline at end of file
diff --git a/tests/files/empty.json b/tests/files/empty.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/tests/files/empty.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/tests/files/full-coco-import-volume.json b/tests/files/full-coco-import-volume.json
new file mode 100644
index 0000000..a72d7eb
--- /dev/null
+++ b/tests/files/full-coco-import-volume.json
@@ -0,0 +1,684 @@
+{
+    "info": {
+        "description": "COCO 2017 Volume",
+        "url": "http://cocodataset.org"
+    },
+    "images": [
+        {
+            "height": 1775,
+            "width": 2500,
+            "id": 5588064,
+            "file_name": "31c3-Wimmelbild-ccby.jpg",
+            "longitude": null,
+            "latitude": null
+        }
+    ],
+    "categories": [
+        {
+            "id": 15,
+            "name": "Animal"
+        }
+    ],
+    "annotations": [
+        {
+            "segmentation": [
+                [
+                    1853.22,
+                    596.22,
+                    1776.16,
+                    799.04,
+                    1597.21,
+                    731.04,
+                    1674.27,
+                    528.23
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 69330.06809999999,
+            "image_id": 5588064,
+            "bbox": [
+                1597.21,
+                528.23,
+                256.01,
+                270.80999999999995
+            ],
+            "category_id": 15,
+            "id": 38917020
+        },
+        {
+            "segmentation": [
+                [
+                    1474.3300000000002,
+                    1165.54,
+                    1473.8187624307873,
+                    1155.1335202112105,
+                    1472.289973220411,
+                    1144.8272605115476,
+                    1469.7583554446887,
+                    1134.7204758158937,
+                    1466.2482899667234,
+                    1124.9104999857984,
+                    1461.793580635865,
+                    1115.4918084511837,
+                    1456.4371287381614,
+                    1106.5551083603089,
+                    1450.2305198335218,
+                    1098.1864650203456,
+                    1443.2335269585758,
+                    1090.4664730414243,
+                    1435.5135349796544,
+                    1083.4694801664782,
+                    1427.1448916396912,
+                    1077.2628712618387,
+                    1418.2081915488163,
+                    1071.9064193641352,
+                    1408.7895000142016,
+                    1067.4517100332766,
+                    1398.9795241841064,
+                    1063.9416445553113,
+                    1388.8727394884525,
+                    1061.410026779589,
+                    1378.5664797887896,
+                    1059.8812375692128,
+                    1368.16,
+                    1059.37,
+                    1357.7535202112106,
+                    1059.8812375692128,
+                    1347.4472605115477,
+                    1061.410026779589,
+                    1337.3404758158938,
+                    1063.9416445553113,
+                    1327.5304999857985,
+                    1067.4517100332766,
+                    1318.1118084511838,
+                    1071.9064193641352,
+                    1309.175108360309,
+                    1077.2628712618387,
+                    1300.806465020346,
+                    1083.4694801664782,
+                    1293.0864730414244,
+                    1090.4664730414243,
+                    1286.0894801664783,
+                    1098.1864650203456,
+                    1279.8828712618388,
+                    1106.5551083603089,
+                    1274.5264193641353,
+                    1115.4918084511837,
+                    1270.0717100332768,
+                    1124.9104999857984,
+                    1266.5616445553114,
+                    1134.7204758158937,
+                    1264.0300267795892,
+                    1144.8272605115476,
+                    1262.501237569213,
+                    1155.1335202112105,
+                    1261.99,
+                    1165.54,
+                    1262.501237569213,
+                    1175.9464797887895,
+                    1264.0300267795892,
+                    1186.2527394884523,
+                    1266.5616445553114,
+                    1196.3595241841062,
+                    1270.0717100332768,
+                    1206.1695000142015,
+                    1274.526419364135,
+                    1215.5881915488162,
+                    1279.8828712618388,
+                    1224.524891639691,
+                    1286.0894801664783,
+                    1232.893534979654,
+                    1293.0864730414244,
+                    1240.6135269585757,
+                    1300.8064650203457,
+                    1247.6105198335217,
+                    1309.175108360309,
+                    1253.8171287381613,
+                    1318.1118084511838,
+                    1259.1735806358647,
+                    1327.5304999857985,
+                    1263.6282899667233,
+                    1337.3404758158938,
+                    1267.1383554446886,
+                    1347.4472605115477,
+                    1269.6699732204108,
+                    1357.7535202112106,
+                    1271.1987624307872,
+                    1368.16,
+                    1271.71,
+                    1378.5664797887894,
+                    1271.1987624307872,
+                    1388.8727394884525,
+                    1269.6699732204108,
+                    1398.9795241841064,
+                    1267.1383554446886,
+                    1408.7895000142016,
+                    1263.6282899667233,
+                    1418.2081915488163,
+                    1259.1735806358647,
+                    1427.1448916396912,
+                    1253.8171287381613,
+                    1435.5135349796544,
+                    1247.6105198335217,
+                    1443.2335269585758,
+                    1240.6135269585757,
+                    1450.2305198335218,
+                    1232.8935349796543,
+                    1456.4371287381614,
+                    1224.524891639691,
+                    1461.7935806358648,
+                    1215.5881915488162,
+                    1466.2482899667234,
+                    1206.1695000142015,
+                    1469.7583554446887,
+                    1196.3595241841062,
+                    1472.289973220411,
+                    1186.2527394884523,
+                    1473.8187624307873,
+                    1175.9464797887895,
+                    1474.3300000000002,
+                    1165.54
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 45088.27560000006,
+            "image_id": 5588064,
+            "bbox": [
+                1261.99,
+                1059.37,
+                212.34000000000015,
+                212.34000000000015
+            ],
+            "category_id": 15,
+            "id": 38917021
+        },
+        {
+            "segmentation": [
+                [
+                    957.16,
+                    1368.35,
+                    731.11,
+                    1465.91,
+                    623.23,
+                    1327.28
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 46292.71590000003,
+            "image_id": 5588064,
+            "bbox": [
+                623.23,
+                1327.28,
+                333.92999999999995,
+                138.6300000000001
+            ],
+            "category_id": 15,
+            "id": 38917022
+        },
+        {
+            "segmentation": [
+                [
+                    2030.9,
+                    1060.28,
+                    1707.24,
+                    1304.17,
+                    2038.6,
+                    1478.75,
+                    2303.18,
+                    1268.23,
+                    2277.5,
+                    944.75,
+                    2107.96,
+                    862.6,
+                    2030.9,
+                    1060.28
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 367188.43099999987,
+            "image_id": 5588064,
+            "bbox": [
+                1707.24,
+                862.6,
+                595.9399999999998,
+                616.15
+            ],
+            "category_id": 15,
+            "id": 38917023
+        },
+        {
+            "segmentation": [
+                [
+                    828.73,
+                    261.85,
+                    828.73,
+                    580.19,
+                    1357.89,
+                    580.19,
+                    1357.89,
+                    261.85
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 168452.79440000004,
+            "image_id": 5588064,
+            "bbox": [
+                828.73,
+                261.85,
+                529.1600000000001,
+                318.34000000000003
+            ],
+            "category_id": 15,
+            "id": 38917024
+        },
+        {
+            "segmentation": [
+                [
+                    625,
+                    1022.95,
+                    634.77,
+                    1022.95,
+                    639.65,
+                    1027.83,
+                    642.09,
+                    1027.83,
+                    656.74,
+                    1042.48,
+                    659.18,
+                    1042.48,
+                    664.06,
+                    1047.36,
+                    666.5,
+                    1047.36,
+                    671.39,
+                    1052.25,
+                    673.83,
+                    1052.25,
+                    681.15,
+                    1059.57,
+                    683.59,
+                    1059.57,
+                    688.48,
+                    1064.45,
+                    690.92,
+                    1064.45,
+                    695.8,
+                    1069.34,
+                    698.24,
+                    1069.34,
+                    700.68,
+                    1071.78,
+                    703.13,
+                    1071.78,
+                    703.13,
+                    1074.22,
+                    705.57,
+                    1076.66,
+                    705.57,
+                    1091.31,
+                    703.13,
+                    1093.75,
+                    703.13,
+                    1098.63,
+                    705.57,
+                    1101.07,
+                    717.77,
+                    1101.07,
+                    725.1,
+                    1093.75,
+                    727.54,
+                    1096.19,
+                    727.54,
+                    1098.63,
+                    729.98,
+                    1101.07,
+                    729.98,
+                    1105.96,
+                    734.86,
+                    1110.84,
+                    742.19,
+                    1103.52,
+                    747.07,
+                    1103.52,
+                    754.39,
+                    1110.84,
+                    756.84,
+                    1110.84,
+                    761.72,
+                    1115.72,
+                    764.16,
+                    1115.72,
+                    766.6,
+                    1118.16,
+                    769.04,
+                    1118.16,
+                    776.37,
+                    1125.49,
+                    778.81,
+                    1125.49,
+                    791.02,
+                    1137.7,
+                    793.46,
+                    1137.7,
+                    795.9,
+                    1140.14,
+                    798.34,
+                    1140.14,
+                    805.66,
+                    1147.46,
+                    803.22,
+                    1149.9,
+                    803.22,
+                    1162.11,
+                    791.02,
+                    1162.11,
+                    788.57,
+                    1164.55,
+                    781.25,
+                    1164.55,
+                    778.81,
+                    1166.99,
+                    776.37,
+                    1166.99,
+                    773.93,
+                    1169.43,
+                    771.48,
+                    1169.43,
+                    769.04,
+                    1171.88,
+                    766.6,
+                    1171.88,
+                    761.72,
+                    1176.76,
+                    761.72,
+                    1179.2,
+                    759.28,
+                    1181.64,
+                    759.28,
+                    1186.52,
+                    756.84,
+                    1188.96,
+                    756.84,
+                    1196.29,
+                    754.39,
+                    1198.73,
+                    754.39,
+                    1203.61,
+                    747.07,
+                    1210.94,
+                    744.63,
+                    1210.94,
+                    739.75,
+                    1215.82,
+                    737.3,
+                    1215.82,
+                    725.1,
+                    1228.03,
+                    722.66,
+                    1228.03,
+                    698.24,
+                    1252.44,
+                    695.8,
+                    1252.44,
+                    693.36,
+                    1254.88,
+                    693.36,
+                    1257.32,
+                    690.92,
+                    1259.77,
+                    690.92,
+                    1296.39,
+                    693.36,
+                    1298.83,
+                    693.36,
+                    1308.59,
+                    690.92,
+                    1311.04,
+                    686.04,
+                    1311.04,
+                    686.04,
+                    1308.59,
+                    681.15,
+                    1303.71,
+                    681.15,
+                    1264.65,
+                    678.71,
+                    1262.21,
+                    678.71,
+                    1259.77,
+                    671.39,
+                    1252.44,
+                    668.95,
+                    1252.44,
+                    659.18,
+                    1242.68,
+                    656.74,
+                    1242.68,
+                    651.86,
+                    1247.56,
+                    651.86,
+                    1286.62,
+                    654.3,
+                    1289.06,
+                    654.3,
+                    1296.39,
+                    649.41,
+                    1301.27,
+                    646.97,
+                    1301.27,
+                    639.65,
+                    1293.95,
+                    639.65,
+                    1291.5,
+                    637.21,
+                    1289.06,
+                    629.88,
+                    1289.06,
+                    627.44,
+                    1286.62,
+                    627.44,
+                    1267.09,
+                    625,
+                    1264.65,
+                    625,
+                    1257.32,
+                    627.44,
+                    1254.88,
+                    625,
+                    1252.44,
+                    625,
+                    1247.56,
+                    622.56,
+                    1245.12,
+                    622.56,
+                    1235.35,
+                    620.12,
+                    1232.91,
+                    620.12,
+                    1220.7,
+                    615.23,
+                    1215.82,
+                    612.79,
+                    1215.82,
+                    610.35,
+                    1213.38,
+                    607.91,
+                    1213.38,
+                    605.47,
+                    1210.94,
+                    603.03,
+                    1210.94,
+                    598.14,
+                    1206.05,
+                    595.7,
+                    1206.05,
+                    595.7,
+                    1186.52,
+                    600.59,
+                    1181.64,
+                    605.47,
+                    1181.64,
+                    612.79,
+                    1174.32,
+                    612.79,
+                    1171.88,
+                    610.35,
+                    1169.43,
+                    610.35,
+                    1166.99,
+                    603.03,
+                    1159.67,
+                    603.03,
+                    1157.23,
+                    595.7,
+                    1149.9,
+                    588.38,
+                    1149.9,
+                    581.05,
+                    1157.23,
+                    581.05,
+                    1159.67,
+                    576.17,
+                    1164.55,
+                    576.17,
+                    1166.99,
+                    571.29,
+                    1171.88,
+                    563.96,
+                    1171.88,
+                    561.52,
+                    1169.43,
+                    554.2,
+                    1169.43,
+                    554.2,
+                    1166.99,
+                    546.88,
+                    1159.67,
+                    544.43,
+                    1159.67,
+                    539.55,
+                    1154.79,
+                    532.23,
+                    1154.79,
+                    529.79,
+                    1157.23,
+                    529.79,
+                    1171.88,
+                    532.23,
+                    1174.32,
+                    532.23,
+                    1208.5,
+                    524.9,
+                    1208.5,
+                    522.46,
+                    1206.05,
+                    522.46,
+                    1193.85,
+                    520.02,
+                    1191.41,
+                    520.02,
+                    1171.88,
+                    517.58,
+                    1169.43,
+                    517.58,
+                    1157.23,
+                    515.14,
+                    1154.79,
+                    515.14,
+                    1140.14,
+                    512.7,
+                    1137.7,
+                    512.7,
+                    1130.37,
+                    510.25,
+                    1127.93,
+                    510.25,
+                    1125.49,
+                    512.7,
+                    1123.05,
+                    512.7,
+                    1118.16,
+                    527.34,
+                    1103.52,
+                    529.79,
+                    1103.52,
+                    544.43,
+                    1088.87,
+                    546.88,
+                    1088.87,
+                    549.32,
+                    1086.43,
+                    551.76,
+                    1086.43,
+                    554.2,
+                    1083.98,
+                    566.41,
+                    1083.98,
+                    568.85,
+                    1086.43,
+                    573.73,
+                    1086.43,
+                    576.17,
+                    1088.87,
+                    581.05,
+                    1088.87,
+                    588.38,
+                    1081.54,
+                    588.38,
+                    1076.66,
+                    590.82,
+                    1074.22,
+                    593.26,
+                    1076.66,
+                    598.14,
+                    1076.66,
+                    603.03,
+                    1071.78,
+                    603.03,
+                    1066.89,
+                    600.59,
+                    1064.45,
+                    593.26,
+                    1064.45,
+                    590.82,
+                    1062.01,
+                    588.38,
+                    1062.01,
+                    585.94,
+                    1059.57,
+                    585.94,
+                    1057.13,
+                    588.38,
+                    1054.69,
+                    590.82,
+                    1054.69,
+                    593.26,
+                    1052.25,
+                    595.7,
+                    1052.25,
+                    600.59,
+                    1047.36,
+                    600.59,
+                    1040.04,
+                    610.35,
+                    1030.27,
+                    617.68,
+                    1030.27,
+                    625,
+                    1022.95
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 85104.66689999997,
+            "image_id": 5588064,
+            "bbox": [
+                510.25,
+                1022.95,
+                295.40999999999997,
+                288.0899999999999
+            ],
+            "category_id": 15,
+            "id": 38917025
+        }
+    ]
+}
\ No newline at end of file
diff --git a/tests/files/missing-category-coco-import-volume.json b/tests/files/missing-category-coco-import-volume.json
new file mode 100644
index 0000000..f155c4b
--- /dev/null
+++ b/tests/files/missing-category-coco-import-volume.json
@@ -0,0 +1,245 @@
+{
+    "images": [
+        {
+            "height": 1775,
+            "width": 2500,
+            "id": 5588064,
+            "file_name": "31c3-Wimmelbild-ccby.jpg",
+            "longitude": null,
+            "latitude": null
+        }
+    ],
+    "annotations": [
+        {
+            "segmentation": [
+                [
+                    1853.22,
+                    596.22,
+                    
+                    1776.16,
+                    799.04,
+                    
+                    1597.21,
+                    731.04,
+
+                    1674.27,
+                    528.23
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 69330.06809999999,
+            "image_id": 5588064,
+            "bbox": [
+                1597.21,
+                528.23,
+                256.01,
+                270.80999999999995
+            ],
+            "category_id": 15,
+            "id": 38917020
+        },
+        {
+            "segmentation": [
+                [
+                    1474.3300000000002,
+                    1165.54,
+                    1473.8187624307873,
+                    1155.1335202112105,
+                    1472.289973220411,
+                    1144.8272605115476,
+                    1469.7583554446887,
+                    1134.7204758158937,
+                    1466.2482899667234,
+                    1124.9104999857984,
+                    1461.793580635865,
+                    1115.4918084511837,
+                    1456.4371287381614,
+                    1106.5551083603089,
+                    1450.2305198335218,
+                    1098.1864650203456,
+                    1443.2335269585758,
+                    1090.4664730414243,
+                    1435.5135349796544,
+                    1083.4694801664782,
+                    1427.1448916396912,
+                    1077.2628712618387,
+                    1418.2081915488163,
+                    1071.9064193641352,
+                    1408.7895000142016,
+                    1067.4517100332766,
+                    1398.9795241841064,
+                    1063.9416445553113,
+                    1388.8727394884525,
+                    1061.410026779589,
+                    1378.5664797887896,
+                    1059.8812375692128,
+                    1368.16,
+                    1059.37,
+                    1357.7535202112106,
+                    1059.8812375692128,
+                    1347.4472605115477,
+                    1061.410026779589,
+                    1337.3404758158938,
+                    1063.9416445553113,
+                    1327.5304999857985,
+                    1067.4517100332766,
+                    1318.1118084511838,
+                    1071.9064193641352,
+                    1309.175108360309,
+                    1077.2628712618387,
+                    1300.806465020346,
+                    1083.4694801664782,
+                    1293.0864730414244,
+                    1090.4664730414243,
+                    1286.0894801664783,
+                    1098.1864650203456,
+                    1279.8828712618388,
+                    1106.5551083603089,
+                    1274.5264193641353,
+                    1115.4918084511837,
+                    1270.0717100332768,
+                    1124.9104999857984,
+                    1266.5616445553114,
+                    1134.7204758158937,
+                    1264.0300267795892,
+                    1144.8272605115476,
+                    1262.501237569213,
+                    1155.1335202112105,
+                    1261.99,
+                    1165.54,
+                    1262.501237569213,
+                    1175.9464797887895,
+                    1264.0300267795892,
+                    1186.2527394884523,
+                    1266.5616445553114,
+                    1196.3595241841062,
+                    1270.0717100332768,
+                    1206.1695000142015,
+                    1274.526419364135,
+                    1215.5881915488162,
+                    1279.8828712618388,
+                    1224.524891639691,
+                    1286.0894801664783,
+                    1232.893534979654,
+                    1293.0864730414244,
+                    1240.6135269585757,
+                    1300.8064650203457,
+                    1247.6105198335217,
+                    1309.175108360309,
+                    1253.8171287381613,
+                    1318.1118084511838,
+                    1259.1735806358647,
+                    1327.5304999857985,
+                    1263.6282899667233,
+                    1337.3404758158938,
+                    1267.1383554446886,
+                    1347.4472605115477,
+                    1269.6699732204108,
+                    1357.7535202112106,
+                    1271.1987624307872,
+                    1368.16,
+                    1271.71,
+                    1378.5664797887894,
+                    1271.1987624307872,
+                    1388.8727394884525,
+                    1269.6699732204108,
+                    1398.9795241841064,
+                    1267.1383554446886,
+                    1408.7895000142016,
+                    1263.6282899667233,
+                    1418.2081915488163,
+                    1259.1735806358647,
+                    1427.1448916396912,
+                    1253.8171287381613,
+                    1435.5135349796544,
+                    1247.6105198335217,
+                    1443.2335269585758,
+                    1240.6135269585757,
+                    1450.2305198335218,
+                    1232.8935349796543,
+                    1456.4371287381614,
+                    1224.524891639691,
+                    1461.7935806358648,
+                    1215.5881915488162,
+                    1466.2482899667234,
+                    1206.1695000142015,
+                    1469.7583554446887,
+                    1196.3595241841062,
+                    1472.289973220411,
+                    1186.2527394884523,
+                    1473.8187624307873,
+                    1175.9464797887895,
+                    1474.3300000000002,
+                    1165.54
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 45088.27560000006,
+            "image_id": 5588064,
+            "bbox": [
+                1261.99,
+                1059.37,
+                212.34000000000015,
+                212.34000000000015
+            ],
+            "category_id": 15,
+            "id": 38917021
+        },
+        {
+            "segmentation": [
+                [
+                    957.16,
+                    1368.35,
+
+                    731.11,
+                    1465.91,
+
+                    623.23,
+                    1327.28
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 46292.71590000003,
+            "image_id": 5588064,
+            "bbox": [
+                623.23,
+                1327.28,
+                333.92999999999995,
+                138.6300000000001
+            ],
+            "category_id": 15,
+            "id": 38917022
+        },
+        {
+            "segmentation": [
+                [
+                    2030.9,
+                    1060.28,
+                    1707.24,
+                    1304.17,
+                    2038.6,
+                    1478.75,
+                    2303.18,
+                    1268.23,
+                    2277.5,
+                    944.75,
+                    2107.96,
+                    862.6,
+                    2030.9,
+                    1060.28
+                ]
+            ],
+            "iscrowd": 0,
+            "area": 367188.43099999987,
+            "image_id": 5588064,
+            "bbox": [
+                1707.24,
+                862.6,
+                595.9399999999998,
+                616.15
+            ],
+            "category_id": 15,
+            "id": 38917023
+        }
+    ]
+}
\ No newline at end of file