Initial codebook method of vector quantisation in Hadamard domain

被引：7
|
作者：
Chen, S. X. [1 ]
Li, F. W. [1 ]
机构：
[1] Chongqing Univ Posts & Telecommun CQUPT, Commun & Informat Engn Coll, Chongqing 400065, Peoples R China
来源：
ELECTRONICS LETTERS | 2010年 / 46卷 / 09期
基金：
中国国家自然科学基金;
关键词：
IMAGE COMPRESSION; ALGORITHM; SEARCH;
D O I：
10.1049/el.2010.3573
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
To deal with the problem that the initialisation method based on random selection may provide a suboptimal codebook of vector quantisation (VQ); an improved method is proposed. In the proposed method, Hadamard transform is performed on training vectors, and then the transformed vectors are sorted according to their first elements. The ordered transformed vectors are partitioned into groups. The initial codebook is composed of the mid vector of each ordered group. This method has a better performance and can be used as the initialisation method of VQ to improve and speed up codebook design.
引用
收藏
页码：630 / U47
页数：2
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