Color copying apparatus for determining exposure amount from ima

Details Color copying apparatus for determining exposure amount from ima Color copying apparatus for determining exposure amount from ima

1996-03-22

1998-06-16

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358518, 358523, 355 35, 355 38, 355 77, H04N 100, G03F 308, G03B 2752, G03B 2780

Patent

active

057679835

ABSTRACT:
A color copying apparatus for constantly obtaining a high-quality print irrespective of a change in film characteristics due to deterioration over time and the like is disclosed. A reference image recorded on the film is photometrically measured to determine film characteristic data. After logarithmically transformed values of photometric values of an original image on one film set in a printing position have been stored, normalizing conditions are determined on the basis of average image data, and a transformation formula or table for transformation between the film characteristic data and image data is generated in correspondence with a film type. Pixels are then selected from the original image set in the printing position, and a characteristic amount of the image is calculated and is made to correspond to print characteristic data by means of the transformation formula or table. An abnormal frame is then determined by using the film characteristic data and the characteristic amount of the image, and an exposure amount is determined by setting coefficients of an exposure calculating formula as a result of the determination, so as to effect exposure control.

REFERENCES:
patent: 4641959 (1987-02-01), Terashita
patent: 5148213 (1992-09-01), Terashita
patent: 5162841 (1992-11-01), Terashita
patent: 5353095 (1994-10-01), Terashita
patent: 5561494 (1996-10-01), Terashita

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