The color vector Angle histogram is constructed in the image edge and used to describe the image.
在图像的边缘空间，提取图像边缘点的颜色矢量角直方图，以此来描述图像的内容。
When the hue difference increased, the magnitude of color shift in test target decreased, but the deflection Angle of color shift vector from constant hue line increased.
当诱导域与试验域之间的色调差增大时，试验目标色觉位移的幅值减小，而色觉位移矢量偏离恒定色调线的偏向角却增大。
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