Title :
Wavelet video coding with ladder structures and entropy-constrained quantization
Author :
Van Dyck, Robert E. ; Marshall, Thomas G., Jr. ; Chin, Melissa ; Moayeri, Nader
Author_Institution :
GEC-Marconi Electron. Syst. Co., Wayne, NJ, UK
fDate :
10/1/1996 12:00:00 AM
Abstract :
A subband decomposition using wavelet filters has become an effective basis for image compression. The use of a ladder structure for the subband filtering provides a fast implementation and allows the system to be useful at video rates. A system is proposed that provides good quality video for moderate motion, roughly common intermediate format-f 0-t (CIF-) sized images at bit rates under 500 kb/s, and for teleconferencing scenes at bit rates from 180 kb/s to below 128 kb/s (basic rate ISDN). The system uses subband coding, a modified version of H.261, and entropy-constrained quantization to achieve the desired bit rate and image quality
Keywords :
channel capacity; digital filters; entropy codes; ladder filters; motion estimation; telecommunication standards; teleconferencing; transform coding; vector quantisation; video codecs; video coding; wavelet transforms; 128 to 180 kbit/s; 500 kbit/s; CIF-sized images; H.261; ISDN; bit rate; common intermediate format-f 0-t sized images; entropy-constrained quantization; image compression; image quality; ladder structures; motion; subband decomposition; subband filtering; teleconferencing scenes; video rates; wavelet filters; wavelet video coding; Bit rate; Filtering; Filters; ISDN; Image coding; Layout; Quantization; Teleconferencing; Video coding; Video compression;
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
