Image reading apparatus and program

Details Image reading apparatus and program Image reading apparatus and program

2006-06-06

2006-06-06

Ahmed, Samir (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

C382S291000, C382S295000, C358S003260, C358S486000

Reexamination Certificate

active

07058236

ABSTRACT:
The object of this invention is to provide an image reading apparatus capable of greatly reducing generation of a black streak image caused by dust, dirt, or the like at a flow scanning position on a document glass table in flow scanning of reading a document image while moving the document sheet at a predetermined speed. To achieve this object, the CPU of the image reading apparatus performs dust detection processing of detecting dust on the document glass table by a dust detection circuit during a document nonreading period. The CPU executes dust correction processing based on the dust detection result during continuous document reading. During an interval between the end of a series of image reading JOBs and the next image reading JOB, the CPU performs dust avoidance processing of changing the flow scanning position to a position free from any dust on the document glass table. If dust is difficult to avoid, the CPU inhibits flow scanning and executes control of switching flow scanning to optical scanning document reading.

REFERENCES:
patent: 5362958 (1994-11-01), Ando
patent: 5500745 (1996-03-01), Iishiba et al.
patent: 5572433 (1996-11-01), Falconer et al.
patent: 5734758 (1998-03-01), Yamamoto et al.
patent: 5982948 (1999-11-01), Shimada et al.
patent: 6563938 (2003-05-01), Harada
patent: 6792161 (2004-09-01), Imaizumi et al.

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