An image coding method based on multiwavelet transform

2011 ◽  
Author(s):  
Wei Liu
Keyword(s):  
Image Coding ◽  
Coding Method ◽  
Multiwavelet Transform

AN IMPROVED EMBEDDED ZEROTREE WAVELET IMAGE CODING METHOD BASED ON COEFFICIENT PARTITIONING USING MORPHOLOGICAL OPERATION

2000 ◽  
Vol 14 (06) ◽  
pp. 795-807 ◽  
Author(s):  
JUNMEI ZHONG ◽  
C. H. LEUNG ◽  
Y. Y. TANG
Keyword(s):  
Image Compression ◽  
Video Coding ◽  
Image Coding ◽  
Experimental Results ◽  
Morphological Operation ◽  
Compression Algorithms ◽  
Still Image ◽  
Coding Method ◽  
Wavelet Image ◽  
Image Compression Algorithm

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.

A Lifting Scheme of Symmetric-antisymmetric Multiwavelet Transform for Image Coding

2012 ◽  
Vol 31 (5) ◽  
pp. 1887-1900 ◽  
Author(s):  
Jiazhong Chen ◽  
Zengwei Ju ◽  
Hua Cao ◽  
Ping Xie ◽  
Changnian Chen ◽  
...  
Keyword(s):  
Image Coding ◽  
Lifting Scheme ◽  
Multiwavelet Transform

Research on Lossless Predictive Coding Methods for Stereo Images

2014 ◽  
Vol 596 ◽  
pp. 406-412 ◽  
Author(s):  
Shi Gao Li
Keyword(s):  
Image Coding ◽  
Predictive Coding ◽  
Prediction Method ◽  
Code Rate ◽  
Experimental Results ◽  
Stereo Image ◽  
Stereoscopic Image ◽  
Coding Method ◽  
Image Pairs ◽  
Very High

There exists very high correlation between left-view images and right-view images of stereo image pairs. The correlation can help to reduce the stereoscopic image coding bit rate. Proposed methods first estimate the disparity by using causal neighborhood pixels. And then a prediction method which combines inter-view prediction with intra-view prediction is used to obtain a better predictive coding method for target-view images. The reference-view images are then encoded by using those commonly used prediction coding method. The experimental results show that compared with those methods using only intra-view correlation, the proposed method can obtain lower code rate.

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