Back-light module for image scanning device and method for...

Details Back-light module for image scanning device and method for... Back-light module for image scanning device and method for...

2006-02-14

2006-02-14

Williams, Kimberly (Department: 2626)

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

C358S505000, C358S461000, C358S509000, C382S167000, C382S162000, C382S255000

Reexamination Certificate

active

06999212

ABSTRACT:
A back-light module for an image scanning device includes a casing, a pair of tubular lamps, a light guide plate, and a frosted transparent plate. The image scanning device includes a document supporting plate and an optical scanning module movable in a longitudinal direction. A calibration of illumination with the back-light module is done by (1) activating the back-light module to project light onto the optical scanning module, (2) driving the optical scanning module in the longitudinal direction, (3) obtaining illumination signals associated with selected pixels of a longitudinally-extending calibration zone formed on the document supporting plate, (4) comparing each illumination signal with a reference to obtain a result and manipulating the result to obtain a calibration parameter, and (5) calibrating the illumination of pixels of an image with the corresponding calibration parameters in scanning a transmissive original document.

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