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    • 10. 发明授权
    • Image processing apparatus, image processing method, and computer readable medium and computer data signal for processing image
    • 图像处理装置,图像处理方法以及用于处理图像的计算机可读介质和计算机数据信号
    • US07949184B2
    • 2011-05-24
    • US11822409
    • 2007-07-05
    • Atsushi Itoh
    • Atsushi Itoh
    • G06K9/00G06K9/36
    • G06K9/4652G06T5/009G06T5/40G06T2207/10024
    • 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.
    • 一种图像处理装置包括:从输入图像产生颜色空间中的直方图的单元; 提取具有直方图中的颜色值的局部最大出现频率的多个峰值的单元; 基于所提取的多个峰值颜色的特征量来确定是否统一所提取的多个峰值,并且当所提取的多个峰值一致时,选择峰值颜色作为代表颜色,其特征量为 所提取的多个峰值颜色和颜色空间中的矢量方向之间的亮度差各自表现出从所提取的多个峰值颜色之一到连接参考颜色和深色之间的线段的最短距离的矢量; 以及通过代表颜色代替输入图像中的每个像素的颜色的单元。