feat: add instance segmentation postprocessing support

focoos/runtime.py

@@ -56,6 +56,15 @@
 logger = get_logger()
 
 
+def get_postprocess_fn(task: FocoosTask):
+    if task == FocoosTask.INSTANCE_SEGMENTATION:
+        return instance_postprocess
+    elif task == FocoosTask.SEMSEG:
+        return semseg_postprocess
+    else:
+        return det_postprocess
+
+
 def det_postprocess(out: List[np.ndarray], im0_shape: Tuple[int, int], conf_threshold: float) -> sv.Detections:
     """
     Postprocesses the output of an object detection model and filters detections
@@ -108,6 +117,26 @@ def semseg_postprocess(out: List[np.ndarray], im0_shape: Tuple[int, int], conf_t
     )
 
 
+def instance_postprocess(out: List[np.ndarray], im0_shape: Tuple[int, int], conf_threshold: float) -> sv.Detections:
+    """
+    Postprocesses the output of an instance segmentation model and filters detections
+    based on a confidence threshold.
+    """
+    cls_ids, mask, confs = out[0][0], out[1][0], out[2][0]
+    high_conf_indices = np.where(confs > conf_threshold)[0]
+
+    masks = mask[high_conf_indices].astype(bool)
+    cls_ids = cls_ids[high_conf_indices].astype(int)
+    confs = confs[high_conf_indices].astype(float)
+    return sv.Detections(
+        mask=masks,
+        # xyxy is required from supervision
+        xyxy=np.zeros(shape=(len(high_conf_indices), 4), dtype=np.uint8),
+        class_id=cls_ids,
+        confidence=confs,
+    )
+
+
 class BaseRuntime:
     def __init__(self, model_path: str, opts: Any, model_metadata: ModelMetadata):
         pass
@@ -136,7 +165,8 @@ def __init__(self, model_path: str, opts: OnnxRuntimeOpts, model_metadata: Model
         self.name = Path(model_path).stem
         self.opts = opts
         self.model_metadata = model_metadata
-        self.postprocess_fn = det_postprocess if model_metadata.task == FocoosTask.DETECTION else semseg_postprocess
+
+        self.postprocess_fn = get_postprocess_fn(model_metadata.task)
 
         # Setup session options
         options = ort.SessionOptions()
@@ -264,7 +294,7 @@ def __init__(
         self.logger = get_logger(name="TorchscriptEngine")
         self.logger.info(f"🔧 [torchscript] Device: {self.device}")
         self.opts = opts
-        self.postprocess_fn = det_postprocess if model_metadata.task == FocoosTask.DETECTION else semseg_postprocess
+        self.postprocess_fn = get_postprocess_fn(model_metadata.task)
 
         map_location = None if torch.cuda.is_available() else "cpu"
 

focoos/utils/vision.py

@@ -109,7 +109,6 @@ def scale_mask(mask: np.ndarray, target_shape: tuple) -> np.ndarray:
     """
     # Calculate scale factors for height and width
     scale_factors = (target_shape[0] / mask.shape[0], target_shape[1] / mask.shape[1])
-
     # Resize the mask using zoom with nearest-neighbor interpolation (order=0)
     scaled_mask = zoom(mask, scale_factors, order=0) > 0.5
 
@@ -123,6 +122,9 @@ def scale_detections(detections: sv.Detections, in_shape: tuple, out_shape: tupl
         x_ratio = out_shape[0] / in_shape[0]
         y_ratio = out_shape[1] / in_shape[1]
         detections.xyxy = detections.xyxy * np.array([x_ratio, y_ratio, x_ratio, y_ratio])
+
+    if detections.mask is not None:
+        detections.mask = np.array([scale_mask(m, out_shape) for m in detections.mask])
     return detections