Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-02-06
1983-10-18
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 54, 358 76, H04N 952, H04N 911
Patent
active
044109083
ABSTRACT:
This invention is an improvement upon the system and method shown in the "Rainbow" U.S. Pat. No. 4,096,523. A special luminance compensation signal is formed by combining the color derivative signals (yellow, green, red, blue, cyan and magenta) with one another. The compensation signal so formed is combined with the luminance signal from a standard luminance matrix. The overall luminance signal is used in the usual way to form video picture signals. The individual color derivative components of the luminance signal can be varied independently of one another. This provides an improved degree of control and correction of video color signals, and corrects for some film errors which previously have not been adequately corrected. Preferably, the gain, pedestal and gamma factors of the overall luminance signal also can be controlled independently. It also is preferred that the primary color component signals delivered to the standard luminance matrix be taken from the output of the gain section of the signal processor for each of the primary color component signals. A special gamma control circuit is provided by means of which it is possible to provide continuous variation of the gamma factor from values substantially less than one to values substantially greater than one. This is done by means of a single circuit which also has excellent noise suppression properties.
REFERENCES:
patent: 2684995 (1954-07-01), Schroeder
patent: 2892025 (1959-06-01), Luther et al.
patent: 2903506 (1959-09-01), Livingston
patent: 3558806 (1971-01-01), Monahan et al.
patent: 4096523 (1978-06-01), Belmares-Sarabia et al.
Color Correction Techniques for Television Cameras, by John F. Monahan and Robert A. Dischert, "Journal of the SMPTE," vol. 78, Sep. 1969, pp. 696-700.
Belmares-Sarabia Armand
Chayka Stanley J.
Corporate Communications Consultants
Martin John C.
Neff Gregor N.
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