Television camera circuit comprising a gamma and an aperture cor

Details Television camera circuit comprising a gamma and an aperture cor Television camera circuit comprising a gamma and an aperture cor

1978-11-06

1980-04-29

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358164, H04N 514, H04N 520

Patent

active

042008883

ABSTRACT:
A combined gamma and aperture (or contour) correction circuit for the picture signal in a television camera, the aperture correction signal having signal values, which are negative and positive-going relative to a reference value, being split into a negative and a positive aperture correction signal. The positive correction signal is added to the picture signal before gamma correction and the negative correction signal is added to the picture signal after the gamma correction. The result is an improved aperture and contour correction, respectively, and less noise in the contours in the darker picture portions.

REFERENCES:
patent: 3919470 (1975-11-01), Blom et al.
patent: 4057828 (1977-11-01), Monahan

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