This paper describes an HDTV parallel coding method based on image division and coding characteristics. Four division methods, spatial division (SP), pixel interleave division (PI), block interleave division (BI) and subband division (SB), are considered from coding efficiency and architecture standpoints. Based on these, SP division and PI division methods are selected for computer simulation using real HDTV test images. Simulation results show that the SP division method is superior to the PI division method. An HDTV coding system using the SP division method into which the techniques of divided-region boundary filtering, synchronized picture skipping, and adaptive bit allocation have been incorporated is discussed in detail. In addition, it is clarified that decoded HDTV images at 16 Mbit/are obtained with good picture quality. Moreover, by introducing an adaptive bandwidth control filter into MPEG2, coding at around 12 Mbit/s, which is a very low bit-rate for HDTV, is possible.
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