Image reading apparatus, control method of image reading apparatus, and storage medium

Patent metadata

Field	Value
Publication number	US-8947749-B2
Application number	US-94959510-A
Country	US
Kind code	B2
Filing date	Nov 18, 2010
Priority date	Dec 18, 2009
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

A method includes reading an image of a document obtained by a reading unit exposing the document to light with an exposure unit, causing the reading unit to perform first reading processing for reading first information obtained by causing the exposure unit to perform exposure with a first light amount, and second reading processing for reading second information obtained by causing the exposure unit to perform exposure with a second light amount that is smaller than the first light amount while no document is placed at a reading position of the reading unit, and detecting a foreign matter existing at the reading position according to a difference between the first and second information.

First claim

What is claimed is:

1. An apparatus, comprising:
a reading unit configured to read an image of a document by eight being emitted to the document by a light emitting unit;
a control unit configured to cause the reading unit to perform first reading processing for obtaining first information by causing the light emitting unit to emit light with a first light amount and to perform second reading processing for obtaining second information by causing the light emitting unit to emit…

Assignees

• Utsunomiya Takehito
• Canon Kk

Inventors

• Utsunomiya Takehito

Classifications

• H04N1/4097 Primary

  Electricity · mapped topic