An improved embedded zerotree wavelet image coding method based on coefficient partitioning using morphological operation

作     者：Zhong, JM Leung, CH Tang, YY 

作者机构：Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China Hong Kong Baptist Univ Dept Comp Studies Hong Kong Hong Kong Peoples R China 

出 版 物：《INTERNATIONAL JOURNAL OF PATTERN RECOGNITION AND ARTIFICIAL INTELLIGENCE》 (国际图形识别与人工智能杂志)

年 卷 期：2000年第14卷第6期

页      面：795-807页

核心收录：

学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：wavelet transform zerotree significance clustering image compression embedded coding morphological operation multiresolution representation 

摘      要：In recent years, wavelets have attracted great attention in both still image compression and video coding, and several novel wavelet-based image compression algorithms have been developed so far, one of which is Shapiro s embedded zerotree wavelet (EZW) image compression algorithm. However, there are still some deficiencies in this algorithm. In this paper, after the analysis of the deficiency in EZW, a new algorithm based on quantized coefficient partitioning using morphological operation is proposed. Instead of encoding the coefficients in each subband line-by-line, regions in which most of the quantized coefficients are significant are extracted by morphological dilation and encoded first. This is followed by using zerotrees to encode the remaining space which has mostly zeros. Experimental results show that the proposed algorithm is not only superior to the EZW, but also compares favorably with the most efficient wavelet-based image compression algorithms reported so far.