System for optically scanning images using optical shutter

Details System for optically scanning images using optical shutter System for optically scanning images using optical shutter

1996-06-10

1999-12-21

Au, Amelia

Image analysis

Image sensing

Optical

382266, 358483, 358484, 358514, G06K 920, G06K 928

Patent

active

060059907

ABSTRACT:
An image is optically scanned by projecting the image onto an optical sensor through an optical shutter. In an exemplary embodiment, the image is projected through the optical shutter while the shutter is made substantially opaque except for a selected substantially transparent group of contiguous pixels. Then, the contents of the document are scanned by advancing this group of pixels across the shutter in a predetermined pattern. The shutter, for example, may comprise an LCD screen. To scan a document, the document is first placed against the shutter. As a light source directs light through the document and the shutter, the shutter is made substantially opaque except for a selected substantially transparent group of contiguous pixels. Then, the contents of the document are scanned by advancing this group of pixels across the shutter in a predetermined pattern. The document may be placed against either side of the shutter--near the light source or near the optical sensor.

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