Method for data reduction of digital video signals by vector qua

Details Method for data reduction of digital video signals by vector qua Method for data reduction of digital video signals by vector qua

1988-09-30

1989-05-09

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 712

Patent

active

048293768

ABSTRACT:
A method for data reduction of digital video signals by vector quantization of coefficients acquired by orthonormal transformation with a symmetrical, nearly cyclical Hadamard matrix, employs formation of a mean value coefficient and a plurality of structure coefficients from a plurality of blocks formed from the input signal in a Peano curve arrangement, these coefficients being in part only scalarly quantized and in part both scalarly as well as vectorially quantized. The quantization takes place in a coder having at least two stages interconnected cascade-like. The reconstruction of the video signal takes place in a decoder, having an identical plurality of stages. The method allows the noise amplitude of the video signal acquired after back-transformation to be adapted to the visibility thresholds of the human visual system.

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patent: 4689672 (1987-08-01), Furakawa et al.
Siemens Forsch.-u. Entwickl.-Ber., vol. 13 (1984) No. 3, entitled "Transform Coding Of Digitized Images Signals", pp. 105-108.
Frequenz 39 (1985) 7/8 entitled "Transform Coding Of Image Sequences With The M-Hadamard Transform", pp. 226-234.

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