| 一种基于小波包最优基算法的图像压缩方法 |
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| 引用本文： | 李国军,沈永增,计建炳,陈勇. 一种基于小波包最优基算法的图像压缩方法[J]. 浙江工业大学学报, 2003, 31(1): 48-52 |
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| 作者姓名： | 李国军 沈永增 计建炳 陈勇 |
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| 作者单位： | 1. 浙江工业大学,信息学院,浙江,杭州,310032
2. 浙江工业大学,化工学院,浙江,杭州,310032 |
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| 基金项目： | 浙江省自然科学基金 (2 990 11) |
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| 摘 要： | 小波包是近年来的一个研究热点，在图像处理方面有着很广泛的应用，本文提出了一种基于快速小波包算法的图像压缩方法，在一维情况下，它比传统算法提高2．67倍，在二维情况下，和具体的图像大小有关，但比传统算法还是提高了三至四倍，因此加快了图像压缩的进程，取得了很好的实验效果，将图像在小波包最优基下展开，利用小波包最优基极好的空间，尺度定位性，使得图像的小波包变换系数在小波变换域极可能的集中从而使在不降低压缩信号的视频质量情况下，提高了图像的压缩比。
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| 关 键 词： | 代价函数 小波包 最优基 图像压缩 图像处理 小波变换 |
| 文章编号： | 1006-4303(2003)01-0048-05 |
| 修稿时间： | 2002-04-15 |
A best basis wavelet packet image compression |
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| LI Guo|jun+,SHEN Yong|zeng+,JI Jian|bing+,CHEN Yong+. A best basis wavelet packet image compression[J]. Journal of Zhejiang University of Technology, 2003, 31(1): 48-52 |
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| Authors: | LI Guo|jun+ SHEN Yong|zeng+ JI Jian|bing+ CHEN Yong+ |
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| Affiliation: | LI Guo|jun+1,SHEN Yong|zeng+1,JI Jian|bing+2,CHEN Yong+2 |
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| Abstract: | Wavelet packet is becoming the focus of research. It is used in image processing. There is a fast wavelet packet method of image compression in the paper. The speed up factor is at most 2.67 in 1|D. In 2|D, the speed up factor is relative to the size of the picture. It increases 3 to 4 times compared with traditional methods. So it quickens the process of image compression and gets a very good experiment result. The image is expressed as a linear combination of the best bases of wavelet packet. The energy of expansion coefficients is concentrated in a small number of coefficients because of the location properties of wavelet packet best bases. So it achieves high compression without any losses of visual information of the compressed image. |
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| Keywords: | cost function wavelet packet best basis image compression |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
