Image forming apparatus that corrects input gray level-output gr

Details Image forming apparatus that corrects input gray level-output gr Image forming apparatus that corrects input gray level-output gr

1994-11-30

1996-12-31

Vu, Kim

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358523, 358524, 358525, 358534, H04N 140, H04N 146

Patent

active

055899501

ABSTRACT:
In an image forming apparatus according to the present invention, characteristic correcting data for correcting input gray level-output gray level characteristics for each of a plurality of steps into which input gray levels are divided is inputted by an inputting device. At the time of image formation processing, input gray level-output gray level characteristic data are corrected on the basis of the characteristic correcting data inputted by the inputting device. Further, when there occurs at the boundary between adjacent steps such a reversal phenomenon that an output gray level in the step having relatively low input gray levels is higher than an output gray level in the step having relatively high input gray levels in input gray level-output gray level characteristic data obtained by correction using a correcting device, the input gray level-output gray level characteristic data are so corrected that output gray levels gradually increase with higher input gray levels in the vicinity of the boundary.

REFERENCES:
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patent: 4805013 (1989-02-01), Dei et al.
patent: 5077158 (1991-12-01), Nakano
patent: 5164822 (1992-11-01), Muramatsu
patent: 5189521 (1993-02-01), Ohtsubo
patent: 5398109 (1995-03-01), Amakawa et al.
patent: 5422738 (1995-06-01), Ishihara
patent: 5422740 (1995-06-01), Fujimoto

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