Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-12-04
1988-09-20
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, 358136, H04N 712
Patent
active
047729465
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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Siemens Forschungs-und Entwicklungs Bericht, vol. 13, (1984), No. 3, pp. 105-108.
Frequenz, 39 (1985), pp. 226-234.
Groody James J.
Peng John K.
Siemens Aktiengesellschaft
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