Image scanner and image forming apparatus

Details Image scanner and image forming apparatus Image scanner and image forming apparatus

2006-12-27

2010-11-09

Safaipour, Houshang (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S448000, C358S461000, C358S474000

Reexamination Certificate

active

07830563

ABSTRACT:
An image scanner includes a scanning unit that scans a white scanning member via a contact glass on one line basis when the image scanner is powered on and outputs image data of the white scanning member, and a determining unit that determines whether at least one of the contact glass and the white scanning member has dirt or a scratch thereon by comparing the image data with reference data on one line basis. The reference data is acquired by scanning the scanning member in a situation that there is no dirt or scratch on the scanning member.

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patent: 6295140 (2001-09-01), Kameyama
patent: 7119926 (2006-10-01), Takeda et al.
patent: 7253932 (2007-08-01), Tsutsumi
patent: 6-78147 (1994-03-01), None
patent: 2002-300391 (2002-10-01), None
patent: 2003-46773 (2003-02-01), None

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