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基于DCT编码的新进展

DOI: 10.11834/jig.20040101

Keywords: 图像处理,离散余弦变换,DCT系数,视觉特性,数字水印,图像大小调整,信号处理

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Abstract:

目前,DCT编码在JPEG、MPEG、H.26x等编码标准中有着广泛的应用,但随着Shapiro关于小波的嵌入式零树小波编码以及Said等人提出的集合分裂等级树编码的成功应用,使图像及视频信号的压缩编码提高到了新阶段,这虽然对传统的DCT编码提出了挑战,然而,Xiong等人利用嵌入式DCT块变换之间直流系数(DC)的高度相关性也能获得较高的编码性能,因为对DCT后的系数进行重组,同样具有小波多分辨率图像的特性。此外,基于形状自适应DCT、区域支撑DCT以及形态DCT的提出,还有利用DCT系数实现信息隐藏、图像大小调整、模式识别等等,都将DCT功能与性能推向更高层次,使得基于常规的DCT编码有了更大的应用与发展空间。为使人们对DCT编码现状有一概略了解,在对该技术进行深入分析与研究的基础上,对该技术作了概略介绍,并对DCT编码发展进行了展望。

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