Image analysis – Color image processing – Color correction
Patent
1997-03-11
2000-07-25
Lee, Cheukfan
Image analysis
Color image processing
Color correction
358519, 358521, 358504, 358406, G03F 308, H04N 146
Patent
active
060945028
ABSTRACT:
In a copying machine, a printer control unit calculates .gamma. correction data according to a grid potential Vg and a development bias potential Vb which are image forming parameters, and a calculation coefficient. The printer control unit reads reflectance data of a copied test pattern in a test pattern read out mode to correct the calculation coefficient for the calculation of .gamma. correction data according to the read out data. Thus, .gamma. correction at always the optimum and accurate level can be carried out without usage of a memory of a large capacity.
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Hirata Katsuyuki
Katori Kentaro
Tanaka Masaki
Lee Cheukfan
Minolta Co. , Ltd.
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