Method for controlling exposure amount in copying of color origi

Details Method for controlling exposure amount in copying of color origi Method for controlling exposure amount in copying of color origi

1990-04-17

1991-01-08

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 77, G03B 2780

Patent

active

049840134

ABSTRACT:
Prior to copying of a color original, the original is scanned for photometric measurement in order to determine an optimum exposure amount for copying. The exposure amount in copying of a color original is controlled by (a) photometrically measuring a color density on the surface of the original, (b) determining whether or not the difference in color density between two positionally different spots exceeds a predetermined value, thereby determining whether the spots belong to an image region or a background region and extracting at least one of the regions, and (c) determining an exposure amount for subsequent copying based on a characteristic quantity of the extracted region.

REFERENCES:
patent: 3677641 (1972-07-01), King et al.
patent: 3888580 (1975-06-01), Amano
patent: 4641959 (1987-02-01), Terashita
patent: 4668082 (1987-05-01), Terashita
patent: 4693596 (1987-09-01), Shigaki
patent: 4769695 (1988-09-01), Terashita
patent: 4816874 (1989-03-01), Terashita et al.

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