Reading device having reference white selecting function for shading correction
Patent 5864408 Issued on January 26, 1999. Estimated Expiration Date: 
July 3, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 3, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOriginal reading apparatus Patent #: 4907097 InventorAssigneeApplicationNo. 674879 filed on 07/03/1996US Classes:358/461, Shade correction358/464, To distinguish intelligence from background358/496, Document moves during scanning358/497, Scanning element moves relative to a flat stationary document358/498Document feedExaminersPrimary: Coles, Edward L.Assistant: Lamb, Twyler Attorney, Agent or FirmForeign Patent References
International ClassesH04N 001/40H04N 001/38 H04N 001/04 Foreign Application Priority Data1995-07-04 JPAbstractA reading device, having both modes of a book scanner and a sheet scanner, to be used in a handling apparatus having a function for selecting a reference white plate. The reading device includes a reading unit, a first reference white plate, which is mounted within an area where an original document is transferred and where therefore dust may be carried and raised thereabouts. The first reference white plate is usually read by the reading unit in the sheet scanner mode. A second reference white plate is mounted out of an area of a transference of an original document, and therefore no dust is carried or raised thereabouts. The reading device further includes a controller which controls the reading unit to suitably select reading a white density from between the first reference white plate and the second reference white plate in accordance with a shading correction situation so as to improve an image output quality. | |
