Photographic copier image contrast control

Details Photographic copier image contrast control Photographic copier image contrast control

1986-03-10

1987-11-10

Goldberg, E. A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346110R, 346139R, 358298, 358296, 358280, 358171, H04N 121, H04N 516, G01D 942, G01D 1516

Patent

active

047061316

ABSTRACT:
A thermally developed photographic copier is provided having two controls, one for adjusting the contrast, or blackness, of an image, and another for adjusting background contrast. A microprocessor samples and processes the settings of these controls to produce a video pedestal determined bythe background contrast control, and a gain control signal adjusted for effects of the background contrast setting to keep amplified video singals within the dynamic range necessary for the image contrast setting. Video signals used to expose light-sensitive paper or film are amplified in accordance with the gain control signal and combined with the video pedestal for desired background contrast. The system can automatically modify the gain and video pedestal levels for different lots of paper or film by recording a calibrated grey scale, scanning the recorded grey scale image, comparing the scanned image with previously stored information on the desired image, and modifying the gain and pedestal values as necessary to reproduce images of the desired appearance.

REFERENCES:
patent: 4314272 (1982-02-01), Miyaji et al.
patent: 4335390 (1982-06-01), Axford
patent: 4542281 (1985-09-01), Thompson
patent: 4568975 (1986-02-01), Harschbarger
patent: 4631589 (1986-12-01), Hongu et al.

Affiliated with

Also associated with

Rating

Photographic copier image contrast control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic copier image contrast control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic copier image contrast control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1071460