Title :
Image coding using DCT of wavelet coefficients
Author :
Kok, C.W. ; Chan, S.C. ; Leung, S.H.
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong
Abstract :
A method to encode wavelet transformed (WT) images is described. WT decomposition of natural images preserves image structure within each subimage. Subsequent coding of this multiresolution representation can be achieved through techniques such as scalar/vector quantization (SQ/VQ). It is proposed that by transforming WT coefficients, a better result can be achieved in both compression ratio and output quality. Experimental results are presented to demonstrate the quality of the decoded images
Keywords :
data compression; discrete cosine transforms; image coding; vector quantisation; wavelet transforms; DCT; compression ratio; decoded images; image coding; image quality; image structure; multiresolution representation; output quality; scalar quantization; vector quantization; wavelet coefficients; wavelet transforms; Cities and towns; Decoding; Discrete cosine transforms; Electronic mail; Energy resolution; Frequency; Image coding; Quantization; Signal resolution; Wavelet coefficients;
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1992., Proceedings of the IEEE-SP International Symposium
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-0805-0
DOI :
10.1109/TFTSA.1992.274156
