Image signal quantizing method and apparatus

Details Image signal quantizing method and apparatus Image signal quantizing method and apparatus

1987-02-17

1988-05-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358260, H04N 701

Patent

active

047469781

ABSTRACT:
In a method of and apparatus for quantizing image signals, an image is divided into a plurality of minute unit regions in the course of quantization of image signals. The image signals in the respective minute unit regions are quantized by applying a plurality of such quantization characteristics that the numbers of levels after quantization are approximately equal to each other and positions of quantization steps are deviated from each other in the quantization width direction. The quantization characteristics are changed over for the respective minute unit regions.

REFERENCES:
patent: 4542411 (1985-09-01), Imanaka
patent: 4571618 (1986-02-01), Hatori
patent: 4626923 (1986-12-01), Yoshida
patent: 4633325 (1986-12-01), Usubuchi
patent: 4661839 (1987-04-01), Plantholt
patent: 4677571 (1987-06-01), Riseman
patent: 4684997 (1987-08-01), Romeo

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