Camcorder equipped with a function for correcting brightness on

Details Camcorder equipped with a function for correcting brightness on Camcorder equipped with a function for correcting brightness on

1993-12-29

1995-07-11

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348 28, H04N 520

Patent

active

054325501

ABSTRACT:
A camcorder equipped with a function for correcting a brightness on sides of the camcorder screen which automatically compensates the brightness on the sides of screen is described. The camcorder includes an amplifier which varies gain of inputted image signal; a first detection member which averages image signal of amplifier; a first comparator which compares output of first detection member with standard voltage; a window signal generation member which outputs a horizontal and a vertical window signals corresponding to the horizontal and vertical window signal among image signals outputted from amplifier; a non-window area detection member detecting an image signal which does not correspond to the horizontal and vertical window signals among image signals outputted from amplifier; a first comparison part which compares an output of the window detection member with that of the non-window detection member; a first gain control member which outputs a signal controlling according to an output of the first comparison part of image signal during horizontal and vertical window signal generation; a counting means which counts outputs of the first comparator and first gain control member and outputs the result to amplifier, so that it can automatically compensates the difference in luminance between the sides and center and records an image signal on magnetic recording medium.

REFERENCES:
patent: 4628362 (1986-12-01), Waehner
patent: 4654710 (1987-03-01), Richard
patent: 4811101 (1989-03-01), Yagi
patent: 4837625 (1989-06-01), Douziech et al.
patent: 5023649 (1991-06-01), Hayashi et al.
patent: 5087976 (1992-02-01), Oda et al.
patent: 5221963 (1993-06-01), Hashimoto et al.

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