Method of controlling exposure of process camera

Details Method of controlling exposure of process camera Method of controlling exposure of process camera

1991-12-20

1992-09-08

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, G03B 2754, G03B 2732

Patent

active

051462680

ABSTRACT:
A method of controlling exposure prepares basic data and original data, prepares data for correction for determining a correction amount of the original data, obtains first dot image, obtains dot percentage differences .delta..sub.H and .delta..sub.S between dot percentages of a highlight region and a shadow region of the first dot image, respectively, and a desired highlight dot percentage and a shadow dot percentage, obtains a correction amount of the original data based on .delta..sub.H and .delta..sub.S and the data for correction to update the basic data based on the correction amount of the original data, and acquires an exposure amount for obtaining second dot image based on the updated basic data and the original data. An apparatus for implementing this method is also disclosed.

REFERENCES:
patent: 3249000 (1966-05-01), Pack
patent: 3619055 (1971-11-01), Archer et al.
patent: 3640623 (1972-02-01), Florsheim, Jr. et al.
patent: 4025189 (1977-05-01), Pugsley
patent: 4902899 (1990-02-01), Lin et al.
patent: 5099276 (1992-03-01), Kagosaki
Printing Magazine 8 (1975): pp. 43-47 "Recent Trends In Exposure Control Systems".
Thirty Five Years of Image Techniques (1978): pp. 93-99 "Exposure Control and Apparatus Therefor".

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