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In this letter, we propose results of distribution tests that indicate that for many natural images, the statistics of the discrete cosine transform (DCT) coefficients are best approximated by a generalized gamma function (GΓF), which includes the conventional Gaussian, Laplacian, and gamma probability density functions. The major parameter of the GΓF is estimated according to the maximum likelihood (ML) principle. Experimental results on a number of χ2 tests indicate that the GΓF can be used effectively for modeling the DCT coefficients compared to the conventional Laplacian and generalized Gaussian function (GGF).
Date of Publication: April 2005