Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-01
1992-09-01
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358474, 358471, H04N 104
Patent
active
051444550
ABSTRACT:
A document to be scanned is corner referenced on a transparent platen, with the document's image facing down. The platen defines an X-Y coordinate system matrix. A moving line of light extends in the X direction and illuminates the document's image, line by line, as the line of light moves in the Y direction. The line of light that is thus reflected from the document is sensed by a linear CCD sensor array having a large number of individual sensor cells arranged in a line that effectively extends in the X direction. Each cell of the CCD array defines an individual pixel (PEL) within the line of light that is reflected from the document. A reflection target is located at a known position relative to the platen's referencing corner, to be scanned prior to scanning the document. Sensing of the target enables (1) the X direction physical position of the CCD sensor array relative to the referencing corner to be accurately determined, and (2) the Y direction physical position of the line of light relative to the the referencing corner to be accurately determined, both parameters being determined prior to scanning of the document.
REFERENCES:
patent: 4724330 (1988-02-01), Tuhro
patent: 4760463 (1988-07-01), Nonoyama et al.
patent: 4864415 (1989-09-01), Beikirch et al.
patent: 4933778 (1990-06-01), Tufano et al.
Boyd David W.
Stein Irene F.
Webb Steven L.
Cochran II William W.
Coles Sr. Edward L.
Grant II Jerome
Hewlett--Packard Company
Winfield Augustus G.
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