Output gradation adjustment method in image output apparatus

Details Output gradation adjustment method in image output apparatus Output gradation adjustment method in image output apparatus

1997-02-24

1999-03-30

Rogers, Scott

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358521, H04N 150, H04N 160

Patent

active

058899286

ABSTRACT:
Method of automating at least a portion of an output gradation adjustment job for an image output apparatus. Test image data are corrected according to an initial gradation correction curve, and a test image is formed according to the image data thus corrected. The test image is read by a scanner to obtain read data. Based on the read data thus obtained, test image data are newly formed. Based on the newly formed test image data, a test image is again formed. The second-time test image thus formed is read by the scanner to obtain read data. Based on the read data obtained by reading the second-time test image, the initial gradation correction curve and a predetermined reference output curve, candidate point data are obtained. Based on the candidate point data, a gradation correction curve is formed and set.

REFERENCES:
patent: 5585927 (1996-12-01), Fukui et al.
patent: 5589954 (1996-12-01), Watanabe
patent: 5754683 (1998-05-01), Hayashi et al.

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