Video signal processing apparatus

Details Video signal processing apparatus Video signal processing apparatus

2005-04-19

2005-04-19

Moe, Aung (Department: 2612)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S255000, C348S370000, C348S607000

Reexamination Certificate

active

06882363

ABSTRACT:
An automatic gain controlling circuit controls a gain of a video signal from an imager having an electronic shutter function according to a gain control signal. An average detecting circuit detects an average level of a luminance signal of the video signal. An automatic exposure controlling circuit generates the gain control signal according to the luminance average level in response to a mode signal indicative of the cycles per second of the ac line and generates a timing signal corresponding to the ac line and a shutter speed control signal together with electronic shutter control signal generation circuit at a unit of the voltage variation cycle of the ac line according to the luminance average level such that a shutter interval of the imager is changed stepwise and each of the shutter intervals is an integer times the voltage variation cycle of the ac line. The automatic exposure controlling range is expanded by changing the shutter speed stepwise from {fraction (1/100)} sec, {fraction (2/100)} sec {fraction (3/100)} sec at 50-Hz-ac area, for example, to provide coarse exposure controlling and fine automatic gain controlling is provided every shutter interval to suppress flicker.

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Thomson-Derwent machine assisted translation of Japanese Publ. No. 10-098650 A.

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