Patent ID: 8077347
Filing Date: 2011-12-13
Classification: H04N

Abstract:
1. An image forming apparatus comprising: a scanning unit configured to deflect a beam irradiated in accordance with output pixel data in a main scanning direction to form an image on a photosensitive member; a storage unit configured to store error information in correspondence with a main scanning position, wherein the error information corresponds misalignment of a scanning line of the beam deflected by the scanning unit in a sub-scanning direction; a correction unit configured to delete pixel data or add pixel data to generate corrected pixel data; a memory configured to store the corrected pixel data; a control unit configured to set an interpolation coefficient and reading sub-scanning positions based on a sub-scanning position of a target output pixel and the error information corresponding to a main scanning position of the target output pixel; a reading unit configure to read the corrected pixel data from the memory based on the reading sub-scanning positions and the main scanning position of the target output pixel; an interpolation unit configured to perform interpolate operation on the corrected pixel data read by the reading unit in accordance with the interpolation coefficient to generate output pixel data for the target output pixel, wherein the control unit changes a line changeover position in a case that the main scanning position of the target output pixel is a line changeover position and the target output pixel is the deleted pixel data or the added pixel data.