Digital terrestrial TV broadcasting will start service in Japan from the year 2003 and extensive plans are being made to provide fully equipped broadcast systems. In this service, the available bit-rate for the secondary distribution of HDTV is limited from 11 to 15 Mbps, and an effective high compression encoding technologies are required to maintain a satisfactory picture quality at such a low bit-rate. In this paper, HDTV is assumed to be a typical digital television application and an adaptive selection of picture types is introduced as an effective technology to achieve higher coding gain. First, the difference in coding performance observed when applying various patterns of picture coding types is shown, and the optimum selection scheme of picture coding types is proposed and evaluated.
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