Variable threshold quantification process in encoding by transfo

Details Variable threshold quantification process in encoding by transfo Variable threshold quantification process in encoding by transfo

1989-09-18

1990-12-18

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, 358136, H04N 712

Patent

active

049790382

ABSTRACT:
The invention relates to a quantization process in an encoding by transformation for transmission on a low rate link of an image signal, said image signal being processed in the form of blocks, each containing a set of digital data, each block being transformed to produce a transformed block of coefficients (Ci) representing the frequency components of the block, each transformed coefficients of a block being quantified during a scan by comparison with quantization levels, the first being called the threshold, the process being characterized in that the quantization is performed with a threshold (T) able to vary between one transfored coefficient (Ci) and the next (Ci+1) in the scan, depending on whether the transformed coefficient does or does not fulfil the conditions -T<Ci<+T.

REFERENCES:
patent: 3662266 (1972-05-01), Limb et al.
patent: 3984626 (1976-10-01), Mounts et al.
patent: 4281344 (1981-07-01), Mounts et al.
patent: 4845560 (1989-07-01), Kondo et al.
Frequenz, vol. 38, No. 10, Oct. 1984, pp. 247-254, Berlin, West Germany; .-A. Vuong: "Entwurf eines blockweise adaptiven DPCM-Coders fur die M-Spektralwerte von Bilddaten", p. 250, paragraph 3.2: Der Quantisierer; it its entirety.
Onzieme Colloque Gretsi, Nice, Aug. 1-Jun. 5, 1987, theme 12: "Images", pp. 777-779; R. Philippe: Presentation d'un codec visiophone a 64 K bit/s, in its entirety.

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