A data coder prepares a frame of data for transmission over a data channel. The frame is first broken into a series of non-overlapping blocks. The blocks are analyzed to determine if they are a “picture” block or a “non-picture” block. Picture blocks are compressed to produce one or more layers...http://www.google.com/patents/US6898313?utm_source=gb-gplus-sharePatent US6898313 - Scalable layered coding in a multi-layer, compound-image data transmission system
