23 June 2003 Video coding of model based at very low bit rates
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Proceedings Volume 5150, Visual Communications and Image Processing 2003; (2003) https://doi.org/10.1117/12.500193
Event: Visual Communications and Image Processing 2003, 2003, Lugano, Switzerland
Very low bit rate coding is an important part of the MPEG-4 standard. To obtain maximum compression in videoconference sequences a technique called model-based coding can be used. With this technique, the face of the speaker is represented by a model, and its movement between frames is coded with a small set of parameters. As with all MPEG standards, the encoder algorithm is not described and this leaves the door open to many possible implementations. In this paper, a summary of model-based coding is presented. Many fields have been studied, including 3D wire-frame models, face detection, facial feature extraction, motion parameter estimation, and face model parameter coding. Several problems need to be solved before model-based video communication will become practical. Some of them are discussed in this paper, such as how to detect and locate a face in an image, how to extract parameters from an image to adapt a face model, and how to compress the animation parameters.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
XianPing Fu, XianPing Fu, Zhao Wang, Zhao Wang, } "Video coding of model based at very low bit rates", Proc. SPIE 5150, Visual Communications and Image Processing 2003, (23 June 2003); doi: 10.1117/12.500193; https://doi.org/10.1117/12.500193


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