Color image forming apparatus

Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic

Reexamination Certificate

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Details

C399S301000

Reexamination Certificate

active

07598971

ABSTRACT:
A color image forming apparatus includes a coordinate conversion part, which converts a ordinate value, for executing a misregistration correction in the unit of a pixel; a gradation conversion part, which converts a gradation level, for executing a misregistration correction in a unit less than a pixel; and a judgment part, which detects a feature of the image and judges whether or not to execute the misregistration correction in a unit less than a pixel by the gradation conversion part. The judgment part compares the gradation level in an object pixel and a pixel adjacent in a sub-scanning direction, thereby judging whether or not to execute the misregistration correction in a unit less than a pixel. Thus, the invention enables to distinguish an image to be subjected to the registration correction in a unit less than a pixel and an image not to be subjected to such correction in a simple manner and also in consideration of the image color.

REFERENCES:
patent: 7075561 (2006-07-01), Ozawa et al.
patent: 7344217 (2008-03-01), Kitamura et al.
patent: 2004/0239746 (2004-12-01), Ozawa et al.
patent: 2006/0232620 (2006-10-01), Kitamura et al.
patent: 2000-158707 (2000-06-01), None
patent: 2001-260422 (2001-09-01), None
patent: 2002-116394 (2002-04-01), None
patent: 2002-135586 (2002-05-01), None
patent: 2003-241131 (2003-08-01), None
patent: 2004-170755 (2004-06-01), None
patent: 2005-10746 (2005-01-01), None
patent: 2006-297633 (2006-11-01), None
Computer-generated translation of JP 2005-010746 cited in the IDS filed on Jan. 5, 2007.
European Official Letter Search Report, dated Sep. 26, 2006, in European Application No. 06011940.1.

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