Intraframe coding and interframe coding are selectively employed for generating a compressed digital video frame in order to record a motion video signal on a small capacity recording medium such as a CD ROM. Motion compensation is also employed for effective compression, and motion compensation in only...http://www.google.com/patents/US5040061?utm_source=gb-gplus-sharePatent US5040061 - Method and apparatus for transmitting a compressed picture signal by using different encoding techniques for portions of each frame
