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background-matting-mobilenetv2

Use Case and High-Level Description

The background-matting-mobilenetv2 model is a high-resolution background replacement technique based on background matting (with MobileNetV2 backbone), where an additional frame of the background is captured and used in recovering the alpha matte and the foreground layer. This model is pre-trained in PyTorch* framework and converted to ONNX* format. More details provided in the paper. For details see the repository. For details regarding export to ONNX see here.

Specification

Metric Value
Type Background_matting
GFlops 6.7419
MParams 5.052
Source framework PyTorch*

Accuracy

Accuracy measured on a dataset composed with foregrounds from the HumanMatting dataset and backgrounds from the OpenImagesV5 one with input resolution 1280x720.

Metric Original model Converted model
Alpha MAD 4.32 4.35
Alpha MSE 1.0 1.0
Alpha GRAD 2.48 2.49
Foreground MSE 2.7 2.69
  • Alpha MAD - mean of absolute difference for alpha.
  • Alpha MSE - mean squared error for alpha.
  • Alpha GRAD - spatial-gradient metric for alpha.
  • Foreground MSE - mean squared error for foreground.

Input

Original Model

Image, name: src, shape: 1, 3, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Expected color order: RGB. scale factor: 255

Image, name: bgr, shape: 1, 3, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Expected color order: RGB. scale factor: 255

Converted Model

Image, name: src, shape: 1, 3, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Expected color order: BGR.

Image, name: bgr, shape: 1, 3, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Expected color order: BGR.

Output

Original model

Alpha matte. Name: pha Shape: 1, 1, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Foreground. Name: fgr Shape: 1, 3, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Converted model

Alpha matte. Name: pha Shape: 1, 1, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Foreground. Name: fgr Shape: 1, 3, 720, 1280, format: B, C, H, W, where:

  • B - batch size
  • C - number of channels
  • H - image height
  • W - image width

Download a Model and Convert it into Inference Engine Format

You can download models and if necessary convert them into Inference Engine format using the Model Downloader and other automation tools as shown in the examples below.

An example of using the Model Downloader:

omz_downloader --name <model_name>

An example of using the Model Converter:

omz_converter --name <model_name>

Demo usage

The model can be used in the following demos provided by the Open Model Zoo to show its capabilities:

Legal Information

The original model is distributed under the MIT License.