| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily and precisely select a character color from a histogram in which color bleeding becomes dominant in a color reduction processing. <P>SOLUTION: A plurality of classes constituted on the basis of a plurality of regions which are set in a hue circle and a plurality of luminance levels which are set in a luminance direction are determined. Frequency distribution of the respective classes is generated from an input image and it is determined whether a hue difference between the classes is a prescribed threshold or more. When the difference is determined to be the prescribed threshold or more, color information of a class whose color hue is the largest and color information of a class whose hue is the smallest are selected as representative colors. When the difference is determined to be less than the prescribed threshold, color information of a class whose frequency distribution is the largest and color information of a class having the largest luminance difference from the class whose frequency distribution is the largest are selected as the representative colors. Respective pixel values included in the input image are replaced with the selected representative colors. <P>COPYRIGHT: (C)2013,JPO&INPIT |
