A hybrid coding method for digital HDTV

TitleA hybrid coding method for digital HDTV
Publication TypeJournal Article
Year of Publication1995
AuthorsNasiopoulos, P., and R. K. Ward
JournalConsumer Electronics, IEEE Transactions on
Pagination1080 -1088
Date Publishednov.
Keywords16 pixel, 32 pixel, 512 pixel, abrupt picture degradation, channel errors, coding errors, compression ratio, data transmission rate, DCT coefficients encoding, digital communication, digital HDTV, digital television, digitally transmitted video images, discrete cosine transforms, error resistance characteristic, error statistics, fixed length coding, high channel noise levels, high definition television, hybrid coding method, image compression, large synchronization blocks, picture block, picture quality, synchronisation, synchronization method, telecommunication channels, transform coding, variable length codes, variable length coding, video coding

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 length coding compression scheme. This method improves the compression ratio by approximately 20% and increases the system's resistance to channel errors. To fortify the transmitted bits against channel noise we then use a synchronization method which restricts the effects of an error to a 32 times;16 pixel picture block. The resulting combined scheme (1) significantly improves the error resistance characteristic of the system, (2) eliminates the abrupt picture degradation, and (3) does not alter the original data transmission rate


a place of mind, The University of British Columbia

Electrical and Computer Engineering
2332 Main Mall
Vancouver, BC Canada V6T 1Z4
Tel +1.604.822.2872
Fax +1.604.822.5949

Emergency Procedures | Accessibility | Contact UBC | © Copyright 2021 The University of British Columbia