Color video camera capable of improving gradation of dark signal

Details Color video camera capable of improving gradation of dark signal Color video camera capable of improving gradation of dark signal

1996-02-14

1997-11-04

Faile, Andrew

Television

Camera, system and detail

Combined image signal generator and general image signal...

348222, 348674, 348675, H04N 5202

Patent

active

056845332

ABSTRACT:
A color camera capable of providing good dark gradation without color hue and saturation change is disclosed, the color camera comprising a picking-up device for converting an incident light into a video signal, a detector for detecting proportion of an area having a signal level below a predetermined dark level to produce a dark area proportion signal, and a stretching circuit for stretching a dark signal level in the video signal in accordance with the dark area proportion signal.

REFERENCES:
patent: 2731557 (1956-01-01), Clayden
patent: 4241362 (1980-12-01), Van der Valk
patent: 4489349 (1984-12-01), Okada
patent: 4969045 (1990-11-01), Haruki et al.
patent: 5068718 (1991-11-01), Iwabe et al.
patent: 5148281 (1992-09-01), Nakamura et al.

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