Black and white image detection

Details Black and white image detection Black and white image detection

2007-12-11

2007-12-11

Williams, Kimberly (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Color separation

C358S001900, C358S002100, C358S538000, C358S540000, C358S461000, C358S462000, C358S463000, C382S162000, C382S163000, C382S168000

Reexamination Certificate

active

10406919

ABSTRACT:
A method and apparatus for classifying an input image as black and white or color is described. The method calculates a first ratio of a color pixel portion to a total pixel portion in the input image. Next, the method calculates a second ratio of the color pixel portion to a combined pixel portion in the input image, where the combined pixel portion comprises the color pixel portion and a dark black and white pixel portion. Finally, the method returns an indication the input image is black and white if the first ratio is less than a first threshold and the second ratio is less than a second threshold.

REFERENCES:
patent: 5973804 (1999-10-01), Yamada
patent: 6097845 (2000-08-01), Ng et al.
patent: 7085413 (2006-08-01), Huang et al.
patent: 2003/0053115 (2003-03-01), Shoda et al.
patent: 10148992 (1998-06-01), None

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