Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
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".
Kagosaki Hiroshi
Komatsubara Shoji
Dainippon Screen Mfg. Co,. Ltd.
Wintercorn Richard A.
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