Image reading apparatus, image correcting method

Patent metadata

Field	Value
Publication number	US-10108857-B2
Application number	US-201715607214-A
Country	US
Kind code	B2
Filing date	May 26, 2017
Priority date	May 30, 2016
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

An image reading apparatus is configured to read an image of each of documents transported in a transport path from an upstream side to a downstream side in a transport direction, acquires a correction factor for correcting a read image on the basis of a fed document number, and corrects the length of the read image in the transport direction on the basis of the correction factor which has been acquired.

First claim

What is claimed is:

1. An image reading apparatus comprising:
a feeder configured to feed documents while providing frictional force in a direction opposite to a transport direction from a mount unit on which the documents are mounted toward a transport path;
a storage configured to store a fed document number of the documents fed by the feeder;
a reader configured to read an image of each of the documents transported in the transport path from an upstream side to a downstream side in the transport direction;
a correction factor acquisition unit configured to acquire, based on the fed document number, a correction factor for correcting a read image read by the reader; and
a correction unit configured to correct a length of the read image in the transport direction on the basis of the correction factor.

2. The image reading apparatus according to claim 1 , wherein
the fed document number stored in the storage is reset when the feeder is replaced.

3. The image reading apparatus according to claim 1 , wherein
the correction factor acquisition unit acquires the correction factor for each of jobs.

4. The image reading apparatus according to claim 1 , further comprising:
a transport roller configured to transport the documents fed by the feeder from the upstream side to the downstream side in the transport direction, wherein
the storage further stores a rotational number of the transport roller, and
the correction factor acquisition unit acquires the correction factor also on the basis of the rotational number.

5. The image reading apparatus according to claim 1 , wherein
the storage further stores a specific adjustment value which is specific to the image reading apparatus, and
the correction factor acquisition unit acquires the correction factor also on the basis of the specific adjustment value.

6. The image reading apparatus according to claim 1 , further comprising:
an adjustment value acquisition unit configured to acquire a variable adjustment value which is variable, wherein
the correction factor acquisition unit acquires the correction factor also on the basis of the variable adjustment value.

7. The image reading apparatus according to claim 1 , further comprising:
an output unit configured to output correction information based on the correction factor.

8. The image reading apparatus according to claim 1 , wherein
the feeder includes a feed roller and a separating roller.

9. An image correcting method of an image reading apparatus including: a feeder configured to feed documents while providing frictional force in a direction opposite to a transport direction from a mount unit on which the documents are mounted toward a transport path; and a reader configured to read an image of each of the documents transported in the transport path from an upstream side to a downstream side in the transport direction, the image correcting method comprising:
causing the feeder to feed the documents;
storing a fed document number of the documents which are fed;
causing the reader to read the image of each of the documents;
acquiring, based on the fed document number, a correction factor for correcting a read image read by the reader; and
correcting a length of the read image in the transport direction on the basis of the correction factor.

Assignees

• Seiko Epson Corp

Inventors

• Murahashi Kenichi
• Kanamitsu Masatomo
• Beppu Wataru

Classifications

• H04N1/00602 Primary

  Feed rollers · CPC title

• H04N1/121

  Feeding arrangements (transporting sheets to or from the scanning position H04N1/0057; control or error compensation of sub-scanning velocity H04N1/0473) · CPC title

• H04N1/00588

  to the scanning position (H04N1/00572, H04N1/00594 take precedence) · CPC title

• H04N1/123

  Using a dedicated sheet guide element · CPC title

• H04N1/04

  Scanning arrangements {, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa}(H04N1/387 takes precedence) · CPC title