| 基于DCT系数小波重组的图像压缩算法 |
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| 引用本文： | 王国华,陈宏,俞一彪,芮贤义. 基于DCT系数小波重组的图像压缩算法[J]. 信息安全与通信保密, 2006, 0(4): 100-102 |
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| 作者姓名： | 王国华 陈宏 俞一彪 芮贤义 |
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| 作者单位： | 苏州大学电子信息学院,苏州,215021 |
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| 摘 要： | 论文提出一种与小波变换结构近似的嵌入式编码—MSESPIHT。将图像8×8子块进行DCT变换后的系数按照小波变换结构重新组合,运用均值去除法降低低频段系数的冗余度。之后,运用基于分层树集合分割排序的编码算法对图像进行压缩编码。实验表明,采用MSESPIHT处理的图像,在相同压缩比的情况下,图像质量得到改善,当码率为1.00bpp时,EZW、MSEDCT、SPIHT、MSESPIHT、峰值信噪比分别为39.55dB、39.75dB、39.97dB、40.12dB。
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| 关 键 词： | DCT系数 小波重组 SPIHT编码 空间方向树 |
| 修稿时间： | 2005-08-23 |
An Image Compression Algorithm Based on DCT Coefficients Rearranged By Wavelet Structure |
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| Wang Guohua,Chen Hong,Yu Yibiao,Rui Xianyi. An Image Compression Algorithm Based on DCT Coefficients Rearranged By Wavelet Structure[J]. China Information Security, 2006, 0(4): 100-102 |
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| Authors: | Wang Guohua Chen Hong Yu Yibiao Rui Xianyi |
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| Abstract: | This paper introduces an embedded coding method based on the similar wavelet coefficients structure, which is said MSESPIHT. The method rearranges coefficients of 8*8 block DCT and reduces high correlation between low frequency coefficients by a mean-subtract method. Then, image is compressed by SPIHT coding with high PSNR at high compression ratios. For EZW,MSEDCT,SPIHT , MSESPIHT, when coding rate is 1.00 bit per pixel, PSNR partly is 39.55dB,39.75dB,39.97dB,40.12dB. |
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| Keywords: | DCT coefficients rearranged by wavelet structure SPIHT coding SOT(spatial orientation tree) |
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