System for compensating for the violation of the constant lumina

Details System for compensating for the violation of the constant lumina System for compensating for the violation of the constant lumina

1988-01-15

1989-03-14

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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358 37, 358 39, 358 16, H04N 969

Patent

active

048129054

ABSTRACT:
The high frequencies of the red, blue and green color television signals, with appropriate individual gain levels, are combined in a mixer having non-additive and additive characteristics, with the standard high frequency luminance signal to obtain a correction signal that is the greatest of the four when all have the same polarity, or in the event any of the four signals has opposite polarity with the others a correction signal that is equal to a linear combination of the two opposite polarity, highest level signals. This correction signal is used to compensate for the violation of the constant luminance principle of a luminance signal that was generated by linear matrixing of gamma corrected color signals. The compensation signal is combined with the luminance signal using a mixer similar to that used to generate the correction signal.

REFERENCES:
patent: 2773116 (1956-12-01), Chatten
patent: 2803697 (1957-08-01), Gibson
patent: 2903506 (1959-09-01), Livingston
patent: 2916544 (1959-12-01), Gibson et al.
patent: 3109056 (1963-10-01), Richman
patent: 3281528 (1966-10-01), James
patent: 3681520 (1972-03-01), Schneider
Ralf Schafer, "High-Definition Television Production Standard--An Opportunity, etc.", SMPTE Journal, Jul. 1985, pp. 749-758.
John P. Rossi, "Optimizing the Encoding Process to Overcome Major Effects of NTSC Color Pictures", Preprint No. 129-92, presented at 129th SMPTE Technical Conference, Oct. 31-Nov. 4, 1987.

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