Method and apparatus for sensing the presence of a line of data

Details Method and apparatus for sensing the presence of a line of data Method and apparatus for sensing the presence of a line of data

1996-02-14

1998-06-02

Le, Que

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250234, 358488, G01N 2186

Patent

active

057604126

ABSTRACT:
Apparatus and a method for sensing the presence of a document on the transparent surface of an optical scanner involve moving a scanner optics carriage to a predetermined position beneath the transparent surface, reading a line of data, and if any of the data is on the "white" side of the gray-scale relative to a threshold, determining that a document is present in the scanner. Optionally, before determining whether a document is present, the apparatus and method may perform an initial threshold comparison to check for the presence of a dark background to ensure that an old document has been removed before the new document is read. The results of the document presence determination are used to generate a signal which is sent through a scanner interface to the host computer for use in automatically initiating a complete scan of a new document.

REFERENCES:
patent: 4071232 (1978-01-01), Fujimoto
patent: 5138674 (1992-08-01), Sugawa
patent: 5568281 (1996-10-01), Kochis et al.

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