Patent ID: 6900829

Claim:
An electronic endoscope system, comprising: an image capturing system, which receives sequential frames of an optical image of an object and sequentially outputs a plurality of image signals respectively corresponding to a plurality of color components of said sequential frames of said optical image; a frame memory for storing image signals; a noise reduction system, which reduces random noise included in each of said plurality of image signals by combining a non-noise-reduced image signal previously stored in said frame memory and including first random noise, with a non-noise-reduced current image signal from said image capturing system and including second random noise, to form a noise-reduced image signal, and outputs a plurality of said noise-reduced image signals, respectively corresponding to said plurality of image signals; a memory which receives said plurality of noise-reduced image signals for each of said sequential frames of said optical image; and a video signal generating system, which generates a video signal for each of said sequential frames based on said noise-reduced image signals, corresponding to said plurality of color components.