Automatic brightness algorithm in a slide to video transfer unit

Details Automatic brightness algorithm in a slide to video transfer unit Automatic brightness algorithm in a slide to video transfer unit

1989-04-20

1991-08-06

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 54, 358214, H04N 336

Patent

active

050382160

ABSTRACT:
A system for automatically controlling the brightness of an optical image which is translated into digital signal samples corresponding to the pixels constituting the image includes a variable area aperture through which the image is transmitted for digitization into the samples, a device for varying the area of the aperture, a device for detecting peak values of the samples, and a device for operating the aperture area varying device until the percentage of the peak values which are above a certain peak value is a certain percentage.

REFERENCES:
patent: 4037254 (1977-07-01), Monahan
patent: 4331979 (1982-05-01), Bendell
patent: 4542403 (1985-09-01), Zimmermann et al.
patent: 4703306 (1987-10-01), Shor
patent: 4829382 (1989-05-01), Hess et al.
patent: 4843476 (1989-06-01), Fujioka et al.

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