Dust and scratch detection for an image scanner

Details Dust and scratch detection for an image scanner Dust and scratch detection for an image scanner

2008-04-08

2008-04-08

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559400, C356S237100

Reexamination Certificate

active

10931317

ABSTRACT:
Multiple scans of the same object are obtained, where for any given line on the object to be scanned, the angle of the illumination is different for each scan. The different scans are obtained from different rows of photosensors that are separated. Because the angles of illumination are different, the resulting shadows in each scan are different. The multiple scans may be combined into a single composite color image. In a composite image, a dust particle may generate a series of overlapping shadows, where each shadow is a different color. Searching the composite image for the unique pattern of colors may identify artifacts or defects. Alternatively, the data for one scanned image may be compared to the data for another scanned image, and any differences may be due to shadows, which may indicate defects.

REFERENCES:
patent: 6064478 (2000-05-01), Paul et al.
patent: 2002/0051228 (2002-05-01), Spears et al.

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