| 基于9/7双正交小波的一种高效矢量量化算法 |
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| 引用本文： | 潘建寿,孙宏伟.基于9/7双正交小波的一种高效矢量量化算法[J].电子与信息学报,2002,24(7):900-904. |
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| 作者姓名： | 潘建寿 孙宏伟 |
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| 作者单位： | 西北大学电子科学系,西安,710069 |
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| 摘 要： | 该文提出一种用于图像压缩的矢量量化算法,该算法用9/7双正交小波对图像进行分解,利用三个方向上各自小波系数之间的相关性,构造符合其特征的跨频带矢量,提高了图像的编码效率和重构质量,同时采用了新的矢量量化技术渐进构造聚类(PCC),实验结果证明,该算法在未熵编码的条件下,获得 PSNR32dB的重构图像,比特率高达 0.141 bpp.而且实现方法十分简单。
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| 关 键 词： | 9/7双正交小波 小波变换 跨频带矢量构造 矢量量化 渐进构造聚类 |
| 收稿时间： | 2000-9-12 |
| 修稿时间： | 2000年9月12日 |
An Efficient vector quantization algorithm based on 9/7 biorthogonal wavelet |
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| Pan Jianshou,Sun Hongwei.An Efficient vector quantization algorithm based on 9/7 biorthogonal wavelet[J].Journal of Electronics & Information Technology,2002,24(7):900-904. |
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| Authors: | Pan Jianshou Sun Hongwei |
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| Affiliation: | Dept. of Electronic Sceince Northwest University Xi'an 710069 China |
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| Abstract: | A novel wavelet-based vector quantization (VQ) algorithm is presented in this paper. In this algorithm, first, 9/7 biorthogonal wavelet transform decomposes the original image, then the correlation of the three direction's wavelet coefficients is used to construct the band-cross vector. Therefore, the high coding efficiercy is obtained. In addition, a new VQ technology is used in this algorithm to improve the coding efficiency and the quality of the code-book. The experimental results show that this coding scheme, no entropy-coding, can get a reconstruction quality(PSNR>32dB) at a very low bit rate(0.142 bpp) with high feasibility. |
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| Keywords: | 9/7 biorthogonal wavelet Wavelet transformation Band-cross vector construction Vector Quantization(VQ) Progressive Constructive Clustering(PCC) |
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