High quality variable rate video coding based on stabilization of lower frequency component

The configuration and performance of a stable, high compression video coding scheme suitable for broadcast quality are described. This scheme was developed for application to high-quality image packet transmission in asynchronous transfer mode (ATM) networks. There are two problems in implementing image packet transmission in ATM networks: the achievement of a compression scheme with high coding efficiency and the achievement of an effective compensation method for cell loss. The scheme considered resolves both these problems. It involves the division of a two-dimensional spectral image signal into several subbands, applies high-compression-ratio, motion-compensated interframe DPCM (differential pulse code modulation) and discrete cosine transform (DCT) to the high-frequency bands, and applies intraframe prediction with DCT to the baseband. This scheme also provides stable compensation for cell loss. It is shown that, based on this system, an original image signal of 165 Mb/s is compressed to about 1/15, and a high-quality reconstructed image stable to cell loss is obtained