A hybrid coding method for digital HDTV signals

TitleA hybrid coding method for digital HDTV signals
Publication TypeConference Paper
Year of Publication1995
AuthorsNasiopoulos, P., and R. K. Ward
Conference NameCircuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on
Pagination769 -772 vol.2
Date Publishedapr.
Keywords16 pixel, 32 pixel, 512 pixel, channel noise, compression ratio, data compression, data transmission, DCT coefficients, digital communication, digital HDTV signals, digital signals, digital television, discrete cosine transforms, error resistance, fixed length coding, high definition television, hybrid coding, picture quality, synchronisation, synchronization, variable length codes, variable length coding, video coding, video images

Digitally transmitted video images suffer from sudden degradation in picture quality at high channel noise levels. This is due to the variable length coding and the large synchronization blocks used. To remedy that, we propose encoding the DCT coefficients by a hybrid fixed and variable lengths compression scheme. This method improves the compression ratio by approximately 20% and increases the system's resistance to channel errors. We then combine this hybrid algorithm with an error protected synchronization method which uses small blocks of size 32 times;16 pixels. The resulting combined schemes 1) significantly improve the error resistance characteristic of the system, 2) eliminate the abrupt picture degradation, and 3) does not alter the original data transmission rate


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