Title :
Image coding based on energy estimation and reordering of wavelets
Author :
Xianglin, Wang ; Guowei, Wu ; Xinggang, Lin
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
In this paper, a new zerotree based wavelet image coding scheme is put forward. Prior to zerotree coding, all the wavelet coefficients are rearranged according to their energy estimation on tree structure. As a result, bit allocation is optimized so that 0.3-0.4dB PSNR improvement of coding efficiency is achieved and both encoding and decoding processes are about 10% less time consuming. Furthermore, the code stream produced is still embedded and able to support multirate image decoding
Keywords :
decoding; estimation theory; image coding; transform coding; tree data structures; wavelet transforms; bit allocation; code stream; coding efficiency; decoding; energy estimation; image coding; multirate image decoding; reordering; tree structure; wavelet coefficients; zerotree based wavelet image coding scheme; zerotree coding; Bit rate; Decoding; Image coding; PSNR; Power engineering and energy; Quantization; Streaming media; Tree data structures; Wavelet coefficients; Wavelet transforms;
Conference_Titel :
Signal Processing, 1996., 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2912-0
DOI :
10.1109/ICSIGP.1996.567177
