Video coding of model-based at very low bit rates

摘要: 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 can be used. With this technique, face speaker represented by model, and its movement between frames coded with small set parameters. As with all MPEG standards, encoder algorithm not described leaves door open to many possible implementations. In paper, summary presented. Many fields have been studied, including 3D wire-frame models, detection, facial feature extraction, motion parameter estimation, model parameter coding. Several problems need solved before video communication will become practical. Some them are discussed such as how detect locate image, extract parameters from image adapt compress animation