Patent ID: 8098407
Filing Date: 2012-01-17
Classification: H04N

Abstract:
1. An image forming apparatus that corrects a position shift of a scan line in a sub-scanning direction, comprising: a digital correction unit configured to perform a straight-line approximation processing, so as to correct the position shift of the scan line in the sub-scanning direction, in a pixel unit w in a main-scanning direction; and a control unit configured to perform control such that the pixel unit w is set to a first number of pixels and the straight-line approximation in the set pixel unit w is performed at a time of an image formation for regular printing, and to perform control such that the pixel unit w is set to a second number of pixels smaller than the first number and the straight-line approximation in the set pixel unit w is performed at a time of a pattern image formation for registration correction for measuring and correcting a color shift, the color shift being measured from the pattern image.