Detecting a defect in an image scanner

Details Detecting a defect in an image scanner Detecting a defect in an image scanner

2007-02-27

2007-02-27

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S246000, C382S274000, C358S003260

Reexamination Certificate

active

09845852

ABSTRACT:
Image data in an image scanner is examined to determine whether lines (light or dark) are present in the image data. By examining whether the lines are present in image data for multiple colors, and whether calibration gains for corresponding photosensors are normal, it can be determined whether the lines are likely caused by a surface defect, on a calibration target, or on a platen, or on an image being scanned.

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U.S. Appl. No. 09/629,495; “Dust And Scratch Detection For An Image Scanner”; Robert G. Gann et al.

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