Patent ID: 6724461
Filing Date: 2004-04-20
Classification: H04N

Abstract:
An image reading method that photoelectrically reads an original image by prescan, sets reading conditions in accordance with prescanned data obtained by the prescan, and performs fine scan that photoelectrically reads the original image to obtain fine scanned data for producing output image data, comprising the steps of:analyzing both data of a preset area of the original image for both the prescanned data and the fine scanned data to calculate at least respective preset density points of density histograms of the prescanned data and the fine scanned data of said preset area as image characteristic values of the prescanned data and the fine scanned data of said preset area; calculating a correction condition for the fine scanned data such that the image characteristic values of the prescanned data and fine scanned data match; and processing the fine scanned data on said correction condition.