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Probability density functions for Hadamard coefficients in transformed television pictures

Probability density functions for Hadamard coefficients in transformed television pictures

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The distributions of Hadamard coefficient for blocks of size 8 × 1 picture elements in six 625-line television pictures were obtained. The data were well approximated by gamma distributions. Low-sequency components were best fitted by choosing Γ(n) with n in the range 1/2−2/3, and high-sequency components by n = 1 (equivalent to the negative exponential distribution).

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