Patent ID: 6522359
Filing Date: 2003-02-18
Classification: H04N

Abstract:
An image signal processing apparatus comprising:an image sensor for reading an image and outputting image data representing the read image as an image data signal; a sample-and-hold circuit for sampling and holding said image data signal for a predetermined output period; an A/D converter for converting an analog signal outputted by said sample-and-hold circuit corresponding to a held image data signal into a digital signal; a reference signal generator for generating a reference signal; a timing generator for generating a read timing signal which is used to readout image data from the image sensor for a predetermined reading period and a hold timing signal which controls hold timing of the sample-and-hold circuit according to said reference signal; and an A/D conversion timing generator for generating a conversion timing signal according to said reference signal for controlling operation of said A/D converter; whereinsaid timing generator changes either said readtiming signal or said hold timing signal so that the same data from the starting point of the output of the image data is held, when changing the output period of the image data for image enlargement or reduction processing.