The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2014
Filed:
Oct. 23, 2009
Tomoyuki Saiki, Suntou-gun, JP;
Go Araki, Suntou-gun, JP;
Yuuji Takayama, Suntou-gun, JP;
Hisashi Ishikawa, Urayasu, JP;
Tomoyuki Saiki, Suntou-gun, JP;
Go Araki, Suntou-gun, JP;
Yuuji Takayama, Suntou-gun, JP;
Hisashi Ishikawa, Urayasu, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
An image forming apparatus forms a color image using image carriers for a plurality of colors by electrophotography. The image forming apparatus stores, for each color, information on the shift amount between an ideal scanning line and an actual scanning line in the main scanning direction on the image carrier. For each color, a color misregistration correction amount calculation unit converts a readout address in a bitmap memory (), based on the stored shift amount information, and reads out image data. A color misregistration correction unit () performs tone correction for the readout image data based on the address, outputting image data containing the value of the decimal part. A multi-level error diffusion unit () performs quantization by multi-level error diffusion processing for the tone-corrected image data containing the value of the decimal part.