Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1988-11-23
1990-07-03
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358224, 358332, 346110R, H04N 584, H04N 979
Patent
active
049395815
ABSTRACT:
A system and method for the accurate reproduction of the gray scale of a video monitor screen includes, in one embodiment, a video monitor and an electronic camera having an internal video receiver with a CRT screen. A gray scale test pattern is displayed on the video monitor screen and measured using a photometer. A gray scale test pattern is also displayed on the electronic camera CRT screen, and the electronic camera test pattern is photographed using film. The test pattern on the developed film is measured using a photoelectric densitometer and the results are entered into a computer memory look-up table and compared, by a tone-by-tone basis, with the ideal luminance value for each tone based on the photometer measurements. A set of corrections is obtained for each tone based on the photometer measurements of the gray scale and corrected to all tones available in the system. Those compensating corrections are used to adjust the luminance, on a pixel-by-pixel basis, of the video screen of the electronic camera, so that the screen is compensated to produce a gray scale in the developed film which reproduces the gray scale of the monitor screen.
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"Sensitometry of Black-and-White Materials", Chapter 17, The Theory of the Photographic Process, Fourth Edition, edited by T. H. James, pp. 501-505.
Gerber Eliot S.
Richardson Robert L.
Swayze W. Daniel
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