In accordance with wide variety of situations which video codecs are applied to, many kinds of codecs have been developed with different design philosophies. This paper outlines objectives, coding algorithms, hardware architectures, and coding performances of our four video codecs; 1. compact codec for LAN, 2. medium rate codec for primary or sub-primary rate transmission, 3. low rate codec for ISDN use, and 4,. HDTV codec for LAN and BB-ISDN.
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