Update hsv-opencv.md

Add image to illustrate the HSV color model.
ashank · Jun 27, 2018 · b513339 · b513339
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commit b513339
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diff --git a/doc/hsv-opencv.md b/doc/hsv-opencv.md
@@ -11,6 +11,8 @@ HSV分别代表，色调（H：hue），饱和度（S：saturation），亮度
 
 亮度（V：value）：取值范围为0(黑色)～255(白色)；
 
+![](http://www.nmt.edu/tcc/help/pubs/colortheory/img/cone.png)
+
 # 效果展示 #
 ![](http://icdn.apigo.cn/hsv.gif)