Title :
Pre-post quantisation and integer wavelet for image compression
Author :
Iwahashi, M. ; Tonomura, Y. ; Chokchaitam, S. ; Kambayashi, N.
Author_Institution :
Dept. of Electr. Eng., Nagaoka Univ. of Technol., Nagaoka Niigata, Japan
Abstract :
Quantisation prior to the integer wavelet transform (Pre-Qnt) is introduced. The best combination of the Pre-Qnt and the conventional post-quantisation (Post-Qnt) in multi-stage band splitting based on the integer wavelet transform is presented.
Keywords :
data compression; entropy; image coding; quantisation (signal); rate distortion theory; roundoff errors; transform coding; wavelet transforms; entropy rate; hybrid method; image compression; integer wavelet transform; lossy coding mode; multistage band splitting; pre-post quantisation; probability density function; rate distortion curves; rounding errors; three-stage decomposition;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20031121
