Color histogram（hsv(hue,saturation,value)）
now I can locate the face in a photo, and make a HSV Color Histogram for it.
this is Sir Alex Ferguson, His face is always red.
i was imaging this two sportsman should seems similar in the diagram.
However, Nani seems a little brighter.
Two 'Vampires', Their Histograms are similar. (But actually Bella is not vampire in this pic, so the blue line is lower.)
What I am going to do this week, is
1. Calculate the MAIN COLOR of the face and eyes.
2. Start the Work on Outline comparison.
3.Start the work on Color comparison
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