Image processing apparatus, image processing method, and...

Details Image processing apparatus, image processing method, and... Image processing apparatus, image processing method, and...

2011-05-24

2011-05-24

Ahmed, Samir A (Department: 2624)

Image analysis

Color image processing

Color correction

C382S162000, C382S166000, C382S168000, C382S172000

Reexamination Certificate

active

07949184

ABSTRACT:
An image processing apparatus includes: a unit producing a histogram in a color space from an input image; a unit extracting a plurality of peak colors having a local maximum frequency of appearance of a color value in the histogram; a unit determining whether to unify the extracted plurality of peak colors, based on a feature amount of the extracted plurality of peak colors, and selecting a peak color as a representative color when the extracted plurality of peak colors are unified, the feature amount being a lightness difference among the extracted plurality of peak colors and directions of vectors in the color space, the vectors each showing a shortest distance from one of the extracted plurality of peak colors to a line segment connecting between a reference color and a dark color; and a unit replacing a color of each pixel in the input image by the representative color.

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patent: 2007/0242878 (2007-10-01), Maxwell et al.
patent: A-05-061974 (1993-03-01), None

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