Method and system for contrast correction of color television si

Details Method and system for contrast correction of color television si Method and system for contrast correction of color television si

1980-05-15

1981-12-08

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

043050905

ABSTRACT:
A contrast correction signal is generated to compensate for the limited contrast range of known image converters. The one of the primary color signals having the highest luminosity is low-pass filtered, its amplitude indicative of darker picture portions boosted, by use of a nonlinear amplifier, the resultant signal is subtracted from a blanking signal which has been subjected to the same nonlinear amplification and the resultant difference signal is multiplied by the composite television signal. The multiplier output constitutes the correction signal which is added to the composite color television signal. The method and system are illustrated with respect to the PAL, NTSC and SECAM systems.

REFERENCES:
patent: 4152720 (1979-05-01), Fenton
patent: 4167750 (1979-09-01), Tomimoto et al.

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