Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1996-05-30
1998-06-02
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Picture signal generator
358474, 399362, 355 25, 355 82, H04N 104, G03B 2732
Patent
active
057609250
ABSTRACT:
An overhead scanning system records pages from bound documents in an upright and open condition. The scanning system is defined with a general imaging geometry that makes the scanning system readily portable, and provides the scanning system with a variable imaging area. Once an operator defines an imaging area of an image acquisition system, the operator positions a light stripe projector to project across the imaging area. After recording calibration data, a perspective transform is provided by a perspective transform generator. In operation, a first image of the bound document having a light stripe projected there across is recorded by the image acquisition system. A page shape transform generator is then used to derive a page shape transform. Subsequently, a second image of the bound document is recorded without projecting a light stripe thereacross. If the second image is warped because of foreshortening, or magnification due to the pages of the bound document being curved, an image correction system de-warps the second image using the perspective and page shape transforms. The de-warped image is reconstructed by "polling" each location in the second image to determine the value of each pixel in the de-warped image.
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Berlin Andrew A.
Saund Eric
Coles Sr. Edward L.
Nguyen Madeleine A-V
Xerox Corporation
Zell Thomas B.
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