Image reader and image reading method

Details Image reader and image reading method Image reader and image reading method

2005-01-04

2005-01-04

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001120

Reexamination Certificate

active

06839153

ABSTRACT:
Even if there may exist a difference in reading density between reading positions, there will be provided an image reader capable of accurately detecting and removing streaks-shaped noise caused by the adhesion of dust particles to the reading unit. A CCD reads an original at each reading position, and image data A and B in each reading position are obtained from an output delay circuit and a shading correction circuit. A streak detection circuit judges a difference A−B between each image data through the use of a threshold corrected on the basis of an average density difference between each image data A and B, and outputs black streak detection data in accordance with the judgment result. A streak removal circuit always outputs the image data A, but if black streak detection data is outputted, image data B corrected on the basis of the average density difference is outputted in place of the image data A.

REFERENCES:
patent: 6366358 (2002-04-01), Satou et al.
patent: 20030090742 (2003-05-01), Fukuda et al.
patent: 9-139844 (1997-05-01), None

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