Black and white level adjustment and normalization circuit for a

Details Black and white level adjustment and normalization circuit for a Black and white level adjustment and normalization circuit for a

1985-09-16

1987-09-15

Cardillo, Raymond F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358244, 358 76, 358 80, H04N 584, H04N 981

Patent

active

046943552

ABSTRACT:
A color video printer for producing a color photographic copy from a color video signal. A self-processing color photographic element is exposed to a sequence of six color field images constituting a full frame of a color video image. The printer includes a monochrome cathode-ray-tube (CRT) and a rotatable color filter having red (R), green (G) and blue (B) filters which are sequentially moved into an optical path between the CRT and the self-processing photographic element positioned at an exposure station. A video signal circuit provides a color video signal to be copied. The color video signal includes luminance and chrominance signals which are demodulated to concurrent R, G, and B component signals. The luminance signal is amplified by a variable gain amplifier which reduces the level of the luminance signal in response to detection of the level of one of the color component signals exceeding a predetermined limit. A gate is selectively actuated to apply one of the color component signals to the CRT. Operator adjustable controls are provided for adjusting the black and white limits of the color component signal applied to the CRT.

REFERENCES:
patent: 4219841 (1980-08-01), Nishimura et al.
patent: 4335397 (1982-06-01), Tamura
patent: 4339769 (1982-07-01), Fujita et al.
patent: 4373156 (1983-02-01), Pfannkuch et al.
patent: 4410908 (1983-10-01), Belmares-Sarabia et al.
patent: 4459616 (1984-07-01), Lemke
patent: 4477831 (1984-10-01), Hosoya
patent: 4488244 (1984-12-01), Freeman
patent: 4500919 (1985-02-01), Schreiber
patent: 4530011 (1985-07-01), Haddick
Philips Report No. EJV 8301 for the TDA 3563 NTSC Demodulator Single Chip Decoder.

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