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Efficient coding of shape and transparency for video objects.

Shankar Manuel Aghito¹, Søren Forchhammer

¹Technical University of Denmark, COM DTU Department of Communications, Optics and Materials, DTU, 2800 Kgs. Lyngby, Denmark. sma@com.dtu.dk

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society

|September 6, 2007

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A new method efficiently codes video transparency and shape information by segmenting alpha planes into three layers. This approach significantly reduces bit rates compared to existing MPEG-4 Part 2 standards.

Area of Science:

Computer Vision
Digital Image Processing
Video Compression

Background:

Object-based video requires gray-level alpha planes for shape and transparency.
Existing methods like MPEG-4 Part 2 use a single transparency layer, limiting efficiency.
Smooth composition of video objects necessitates accurate shape and transparency data.

Purpose of the Study:

To introduce a novel coding scheme for gray-level alpha planes in object-based video.
To improve the efficiency of coding shape and transparency information.
To reduce the bit rate required for video object composition.

Main Methods:

Segmentation of the alpha plane into three layers: binary shape, opaque, and intermediate.
Development of distinct encoding schemes for each layer, leveraging cross-layer correlations.

Related Experiment Videos

Utilizing a novel video shape coder for the binary shape layer, extended with an inter-mode for temporal redundancies.

Employing morphological erosion to model correlations between the opaque layer and the binary shape layer.

Proposing three solutions for coding the intermediate layer, utilizing information from previously encoded layers.

Main Results:

The proposed scheme achieves substantial bit rate savings in coding shape and transparency.
Significant improvements in compression efficiency are demonstrated compared to MPEG-4 Part 2 tools.
The three-layer segmentation effectively replaces the single transparency layer of MPEG-4 Part 2.

Conclusions:

The novel coding scheme offers a more efficient method for handling alpha planes in object-based video.
The technique provides considerable bit rate reduction, beneficial for video compression applications.
This layered approach enhances the coding of shape and transparency, leading to better video quality and reduced bandwidth usage.