Signal processing apparatus for use with a single chip solid-sta

Details Signal processing apparatus for use with a single chip solid-sta Signal processing apparatus for use with a single chip solid-sta

1988-03-22

1989-11-28

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358 41, H04N 9077, H04N 904, H04N 964

Patent

active

048841293

ABSTRACT:
A signal processing apparatus for use with an imaging device having an image signal output circuit inherently generating noise in operation so that noise may be superposed on the image signal. The apparatus comprises a noise suppressor having a sampling and holding circuit for producing noise-suppressed pixel signals carrying different color information to contribute to suppression of noise superposed on the image signal and at the same time to demodulation of chroma signals representative of color components of an image and adders for producing a sum of and a difference between the noise-suppressed pixel signals to thereby produce a luminance signal and chroma signals for an image. The apparatus may further comprise a gain control circuits interposed between the sampling and holding circuit and the difference producing adder so that the amplitudes of the noise-suppressed pixel signals are leveled to improve the color purity of an image reproduced from the image signal.

REFERENCES:
patent: 4620222 (1986-10-01), Baba et al.
patent: 4656503 (1987-04-01), Hynecek
patent: 4682211 (1987-07-01), Kaji
patent: 4794448 (1988-12-01), Takizawa
patent: 4809074 (1989-02-01), Imaide et al.
Masamori Omae et al., "Color Imaging Characteristics of CCD for PAL System", Preliminary Transactions of the 1985 Nationwide Congress of the Institute of Television Engineers of Japan, 1985, pp. 83-84.

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