| US 7,525,692 B2 | ||
| Method and apparatus for image reading capable of obtaining adequate white reference data for shading correction | ||
| Kazuhiko Nakaya, Nagoya (Japan) | ||
| Assigned to RICOH Company Ltd., Tokyo (Japan) | ||
| Filed on Mar. 12, 2004, as Appl. No. 10/798,570. | ||
| Claims priority of application No. 2003-066781 (JP), filed on Mar. 12, 2003. | ||
| Prior Publication US 2004/0179242 A1, Sep. 16, 2004 | ||
| Int. Cl. H04N 1/04 (2006.01) | ||
| U.S. Cl. 358—461 [358/496; 358/498] | 18 Claims |
| 1. An image reading apparatus, comprising:
a reader configured to read one side of an original document being conveyed at a reading position;
a contact glass comprising a surface configured to contact the original document;
a reference disposed at a side of the contact glass opposite to the surface and configured to be movable between the reading
position and a standby position, the reference comprising a surface configured to face the reader, the surface having a predetermined
color to provide shading data used for a shading correction;
a carrier configured to move the reference to the reading position; and
guiding members configured to guide the reference moving between the standby position and the reading position above the standby
position,
wherein the reader is configured to obtain the shading data by reading the predetermined color on the surface of the reference
at the reading position and to read the predetermined color on the surface of the reference at a plurality of locations as
the reference slides down towards the standby position from the reading position when the carrier is deactivated.
|