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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (9): 1705-1710    DOI: 10.3785/j.issn.1008-973X.2010.09.013
    
Reorder discrete cosine transform method for video compression
ZHANG Yi-xiong1, CHEN Ling-yu1, WANG Wei-dong2
1.Department of Communication  Engineering, Xiamen University, Xiamen 361005, China；
2.Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  

In traditional video compression, discrete cosine transform (DCT) is sensitive to the prediction error with nonhorizontal or nonvertical orientations. To improve the performance of DCT in video compression, this work proposed a reorder DCT method, from the view point of modifying signal distribution. In the algorithm, reorder operation was first used to change the pixel position of the blocks to be transformed, and then 2DDCT was applied. Experimental results show that the reorder DCT can reduce the number of DCT coefficients at high frequency. Compared to the traditional DCT, the reorder DCT achieved 0.20-0.30 dB peak signal-to-noise ratio (PSNR) gain without reorder information. With reorder information, 0.05-0.20 dB PSNR gain could be obtained．

Published: 01 September 2010
CLC:  TN 919.81  
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Cite this article:

ZHANG Yi-Xiong, CHEN Ling-Yu, WANG Wei-Dong. Reorder discrete cosine transform method for video compression. J4, 2010, 44(9): 1705-1710.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2010.09.013     OR     http://www.zjujournals.com/eng/Y2010/V44/I9/1705


视频图像编码中的重排DCT方法

为了提高离散余弦变换（DCT）在视频图像编码中的效率,根据DCT对非水平/非垂直残差信号较敏感的特点,从改变残差信号分布的角度出发,提出一种重排DCT方法.对待编码的残差图像块进行像素位置重排,使得残差信号的方向与水平或垂直方向相一致；对重排后的图像块进行2维DCT,从而减少DCT系数的高频分量,提高压缩效率.实验结果表明:在不考虑重排信息的情况下,重排DCT比传统DCT性能提高020～030 dB；在考虑重排信息的情况下,重排DCT比传统DCT性能提高005～020 dB.

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