Patent ID: 8107132
Filing Date: 2012-01-31
Classification: H04N

Abstract:
1. An image forming apparatus comprising: a white reference sheet provided at one side of a flat bed, on which an object to be scanned is laid; an image sensor module including an image sensor to detect light reflected from the white reference sheet in a scanning operation for the white reference sheet and light reflected from an image on the object in a scanning operation for the object, and to output analog image signals respectively corresponding to the reflected lights; an analog front end to convert each analog image signal output from the image sensor to a digital image signal; a shading memory to store shading data obtained in the scanning operation for the white reference sheet; and a controller to calculate differences of mean values of dummy pixel values included in the stored shading data corresponding to R, G, and B channels of the image sensor, the dummy pixel values corresponding to dummy pixel areas positioned outside of the white reference sheet, and to correct the stored shading data, based on the calculated differences of mean values, and to correct image data outputs generated from the R, G, and B channels in the scanning operation for the object, based on the calculated differences of mean values.