Patent ID: 6542202
Filing Date: 2003-04-01
Classification: H04N

Abstract:
A video signal processing apparatus, comprising:a video signal amplifying circuit amplifying an input video signal in accordance with a gain control coefficient, and outputting a video signal of a predetermined image size; a frame addition circuit connected to said video signal amplifying circuit and adding outputs of said video signal amplifying circuit by a predetermined number of frames; a first signal level detecting circuit connected to said video signal amplifying circuit and calculating said gain control coefficient and a multiplication coefficient in accordance with an output of said video signal amplifying circuit, wherein calculating said gain control coefficient and multiplication coefficient includes generating the gain control coefficient and the multiplication coefficient to provide an addition and averaging period, a variable period, and an addition period based upon an illuminance; and a first multiplier connected to said frame addition circuit and said first signal level detecting circuit, and receiving as inputs an output of said frame addition circuit and said multiplication coefficient.