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Improving distribution and flexible quantization for DCT coefficients

By Jarek Duda
While it is a common knowledge that AC coefficients of Fourier-related transforms, like DCT-II of JPEG image compression, are from Laplace distribution, there was tested more general EPD (exponential power distribution) ρexp(xκ)\rho\sim \exp(-|x|^{\kappa}) family, leading to maximum likelihood estimated (MLE) κ0.5\kappa\approx 0.5 instead of Laplace distribution κ=1\kappa=1 - such replacement... Show more
August 13, 2020
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Improving distribution and flexible quantization for DCT coefficients
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