Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-07-25
1987-07-14
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 27, 358 36, 358163, H04N 9077, H04N 518, H04N 964, H04N 968
Patent
active
046806245
ABSTRACT:
A signal processing circuit for a color video camera using a single image pickup tube with less color phase and color noise at a low luminance portion, comprises in a clamping circuit for clamping a black level of a video signal produced from the image pickup element, a circuit for superimposing a shading correction signal onto a clamp reference signal. To further reduce the color phase and noise, there is provided a circuit for separating a luminance signal and a plurality of chrominance signals from a video signal produced from the image pickup tube, a circuit for demodulating the separated chrominance signals to obtain color difference signals with the luminance signal, a circuit for modulating a carrier with the color difference signals to obtain carrier color difference signals, a variable gain amplifier circuit provided in a transmitting path of the carrier color difference signals, and a circuit for detecting a luminance component of a level lower than a predetermined level from a luminance signal of a video signal produced from the image pickup tube, whereby the variable gain amplifier circuit operates such that when the level of the luminance signal is lower than a predetermined level, the amplitude of the carrier chrominance signal is made smaller as the luminance becomes lower.
REFERENCES:
patent: 2445040 (1948-07-01), Schade
patent: 3936870 (1976-02-01), Nakamura
patent: 4359756 (1982-11-01), Schneider et al.
patent: 4473839 (1984-09-01), Noda
patent: 4562459 (1985-12-01), Sokei
"The Journal of the Institute of Television Engineers of Japan", Mar. 1981, vol. 35, No. 3, pp. 183-194.
Groody James J.
Hitachi , Ltd.
Svihla Randall S.
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