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基于DSPs的小波图像压缩技术的研究
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摘要
图像压缩编码长期以来利用离散余弦变换(DCT)作为变换编码的主要技术。然而利用DCT作为主要技术的变换编码方法存在着明显的方块效应,而且进一步提高压缩性能很困难。小波变换由于具有能够有效描述非平稳信号的独特优点而成为当前图像压缩编码研究的主要方向。本文从分析小波变换入手,通过对图像小波系数的分析,在综合多种压缩方法的基础上,提出了一种结合快速矢量量化和多级矢量量化的双正交小波变换编码算法。该算法充分利用了小波分解后各子带间的相关性,跨子带构造高维数矢量,利用改进的渐进构造聚类(PCC)结合LBG的算法生成了具有代表性的最优码书,并提取特征矢量快速实现矢量量化,最后通过二级量化进一步降低矢量量化的复杂度。本文还给出了该算法在DSPs上实现的设计方法,预测DSPs可以解决算法中大量乘法运算的难题。
The DCT was used as the main method of image transform coding for a long time. But there is obvious "block noise" in this transform coding method useing DCT. And it is difficult to improve the compression performance. Wavelet transform becomes the main subject of image compression coding for it has the advantage of describing non-steady signal. In this paper, we begin with the analysis of wavelet transform. After the analysis of image wavelet coefficients and methods of image compression, a method of vector-constitution among different subbands, making verctor book using PCC+LBG, and fast VQ is presented. At the same time a better compression performance is improved by using multistage vector algorithm, the design of this algorithm based on DSPs is given at the end of this paper.
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