Patent ID: 6594038
Filing Date: 2003-07-15
Classification: H04N

Abstract:
A method of processing an image signal comprising:selecting between an ordinary image reading mode and a fine image reading mode; illuminating an original document with a light source; focusing a reflected light or transmitted light from the original document to a photoelectric converter with an optical system; moving the photoelectric converter relative to the original document in a subsidiary scanning direction; generating signal data representative of a plurality of image scanning lines with the photoelectric converter, wherein each scan line includes a plurality of pixels; reading out the signal data from the photoelectric converter and supplying the signal data to an image processing circuit; wherein the signal data in said fine image reading mode is read out from said photoelectric converter and supplied into said processing circuit every 1/n times (n being an integer of two or more) of the number of times of the signal data is readout in the ordinary image reading mode; and wherein the signal data in said fine image reading mode is read out from said photoelectric converter and supplied into said signal processing circuit every 1/n times of the number of times of the signal data is read out in the ordinary image reading mode when the speed of the relative movement between the photoelectric circuit to the original document is set at 1/n of that of the speed in the ordinary image reading node.