Platen cover for a digital document scanner with electrically sw

Details Platen cover for a digital document scanner with electrically sw Platen cover for a digital document scanner with electrically sw

1995-09-08

1998-08-04

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Liquid crystal for recording or imaging on photosensitive...

349113, G02F 113

Patent

active

057902119

ABSTRACT:
A system and method digitally scans a document using a high reflectance mode and a low reflectance mode. Initially, a platen cover provides a low reflectance background around the document and the scanner scans the low reflectance background and document to determine an edge of the document or to retrieve other image characteristics of the document. Subsequently, the platen cover changes so as to provide a high reflectance background around the document. The scanner then scans the high reflectance background and the document and produces digital image data relating to an image on the document.

REFERENCES:
patent: 3936172 (1976-02-01), McVeigh
patent: 4012122 (1977-03-01), McVeigh
patent: 4603945 (1986-08-01), Fergason
English Abstract of Laid-open Japanese Patent Application, JP05252350.

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