Method for data reduction of digital picture signals by vector quantization of coefficients acquired by orthonormal transformation by means of a symmetrical, nearly cyclical Hadamard matrix
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United States of America Patent
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Sep 20, 1988
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N/A
app pub date -
Dec 4, 1986
filing date -
Dec 4, 1985
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Expired
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Abstract
A method and apparatus for data reduction of digital picture signals by vector quantizing of coefficient acquired by orthonormal transformation using a symmetrically, nearly cyclical Hadamard matrix, includes means for deriving a mean value coefficient and a plurality of structure coefficients from a plurality of blocks formed from the input signal and resorted by means of a Peano curve, said coefficients being in part only scalarly quantized, and in part scalarly and vectorly quantized. The apparatus and method allows a noise amplitude of the picture signal acquired after back transformation to be adapted to visibility thresholds of the human visual system according to CCIR recommendation 500-1.
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