Detecting and compensating for color misregistration...

Details Detecting and compensating for color misregistration... Detecting and compensating for color misregistration...

2008-07-15

2008-07-15

Poon, King Y. (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Color separation

C358S504000, C358S518000

Reexamination Certificate

active

10672234

ABSTRACT:
A method, computer program product and system for detecting and compensating for color misregistration. A black/white edge or a solid color edge on a target may be scanned. A black/white edge may refer to a black image, e.g., black text, on a white surrounding background having a rapid spatial transition from black to white. A solid color edge may refer to a solid color image, e.g., solid color text, on a white surrounding background having a rapid spatial transition from color to white. A curve of gray values versus spatial pixel positions for each color channel, e.g., red, green and blue color channels, may be generated. A misregistration error may then be calculated by calculating the offset between the color channel curves. The misregistration error may then be used to calibrate the scanner to compensate for the detected color misregistration.

REFERENCES:
patent: 5000570 (1991-03-01), Neilson et al.
patent: 6034795 (2000-03-01), Smitt
patent: 6587224 (2003-07-01), Nabeshima et al.
patent: 2002/0141003 (2002-10-01), Chang et al.
patent: 60230760 (1985-11-01), None

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