Distributions of the Two-Dimensional DCT Coefficients for Images
Distributions of the Two-Dimensional DCT Coefficients for Images
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DOI：
10.1109/tcom.1983.1095893
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发表时间：
1983-06
期刊：
影响因子：
--
通讯作者：
R. Reininger;J. Gibson
中科院分区：
文献类型：
--
作者：
R. Reininger;J. Gibson
对于二维离散余弦变换（DCT）图像编码系统，关于变换系数的分布有不同的假设。本文提出的分布测试的结果表明，对于许多图像的统计系数是最好的近似高斯分布的DC系数和拉普拉斯分布的其他系数。此外，从DCT编码系统的模拟表明，假设系数是拉普拉斯产生更高的实际输出信噪比和更好的理论和模拟之间的协议比高斯假设。
For a two-dimensional discrete cosine transform (DCT) image coding system, there have been different assumptions concerning the distributions of the transform coefficients. This paper presents results of distribution tests that indicate that for many images the statistics of the coefficients are best approximated by a Gaussian distribution for the DC coefficient and a Laplacian distribution for the other coefficients. Furthermore, from a simulation of the DCT coding System it is shown that the assumption that the coefficients are Laplacian yields a higher actual output signal-to-noise ratio and a much better agreement between theory and simulation than the Gaussian assumption.