Image reading apparatus and correction method thereof

Patent metadata

Field	Value
Publication number	US-9300829-B2
Application number	US-201514666073-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Apr 4, 2014
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

In conventional image reading in a large-sized scanner using plural CIS sensors, overall linearity of an original is poor, and a shift occurs particularly at connection portions of the CIS sensors in the read image. To solve this, an image reading apparatus in which CISs are arranged zigzag, and an original is read while conveying the original by a conveyance roller in a direction different from an arrayed direction of the reading elements of the CIS sensors performs following correction. That is, a shift from an image position in a calibration sheet corresponding to a rotation angle of the conveyance roller for at each position of the CIS sensors is detected from image data obtained by reading the calibration sheet while conveying the calibration sheet by the conveyance roller. The shift is corrected.

First claim

What is claimed is:

1. An image reading apparatus that reads an image of an original, comprising:
a plurality of line reading sensors, each formed by arraying a plurality of reading elements, which are arranged in a direction the plurality of reading elements are arrayed and used for reading the image of the original;
a conveyance roller for conveying the original in a direction different from the direction in which the plurality of reading elements are arrayed;
a drive unit c…

Assignees

• Canon Kk

Inventors

• Sohara Yoshitsugu

Classifications

• H04N1/00092

  Electricity · mapped topic

• H04N1/00018

  Electricity · mapped topic

• H04N1/00819 Primary

  Electricity · mapped topic