Articles

Two improved codebook search methods of vector quantization based on orthogonal checking and fixed range search

[+] Author Affiliations
Chin-Chen Chang, Wen-Tsai Li

National Chung Cheng University, Department of Computer Science and Information Engineering, Chaiyi, Taiwan, Republic of China

Tung-Shou Chen

National Chin-Yi Institute of Technology, Department of Information Management, Taiping, Taichung, Taiwan, Republic of China

J. Electron. Imaging. 7(2), 357-366 (Apr 01, 1998). doi:10.1117/1.482606
History: Received Jan. 3, 1996; Revised Apr. 30, 1997; Accepted Nov. 13, 1997
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Abstract

We present two improved methods for the codebook search in this article. We call them the improved eigenvector method (IEVM) and the improved triangle inequality elimination (ITIE), respectively. IEVM is a full-search (FS) equivalent method, but ITIE is not. In these two methods we propose some techniques, such as the orthogonal checking and the fixed range search, to speed up their performance. According to our experimental results, IEVM is an efficient method. It is faster than FS, TIE, and EVM. Its execution time and number of operations per pixel were 4.86% and 4.76% of those in FS, respectively. As for ITIE, it is always faster than IEVM even if we limit its peak signal-to-noise ratio degradation to be no greater than 3% of the image quality of FS. Under this limitation, the execution time and the number of operations per pixel of ITIE were only 3.08% and 3.05% of those in FS, respectively. © 1998 SPIE and IS&T.

© 1998 SPIE and IS&T

Citation

Chin-Chen Chang ; Wen-Tsai Li and Tung-Shou Chen
"Two improved codebook search methods of vector quantization based on orthogonal checking and fixed range search", J. Electron. Imaging. 7(2), 357-366 (Apr 01, 1998). ; http://dx.doi.org/10.1117/1.482606


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