Reading device having reference white selecting function for sha

Details Reading device having reference white selecting function for sha Reading device having reference white selecting function for sha

1996-07-03

1999-01-26

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358461, 358464, 358496, 358497, 358498, H04N 140, H04N 138, H04N 104

Patent

active

058644083

ABSTRACT:
A 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.

REFERENCES:
patent: 4907097 (1990-03-01), Sobue

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