Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1996-04-24
1998-02-17
Le, Que
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
2505591, 250234, 358488, G01N 2186
Patent
active
057194041
ABSTRACT:
A method and apparatus is used on a flatbed scanner for calibrating the horizontal starting point of a document which is to be scanned by the flatbed scanner. The flatbed scanner is of the type having a light-sensing device as a CCD or CIS device consisting of a linear array of light-sensing cells and a movable scan head. In the method and apparatus, two reflective marks are fixed at a predetermined calibrating position to the front edge of the document. During the calibration process, the movable scan head is moved to the calibrating position where it senses the two reflective marks to thereby determine the distance in pixels between the first light-sensing cell on the linear array and the first reflective mark, and also the distance in pixel between the two reflective marks. The distance in pixel between the first reflective mark and the horizontal starting point of the document can then be determined. After that, the distance in pixels between the first light-sensing cell on the linear array and the horizontal starting point of the document is determined to thereby determine which light-sensing cell on the linear array is to be used as the starting light-sensing cell corresponding to the horizontal starting point of the document. The movable scan head is then further moved to the front edge of the document where the scan process over the document is started.
REFERENCES:
patent: 4957689 (1990-09-01), Ohnishi et al.
patent: 5097350 (1992-03-01), Baran
patent: 5479274 (1995-12-01), Baba
Le Que
Must Systems Inc.
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