问题
I have written the code for histogram and i want to use it for SVM traning. But the fundamental problem is that i don't understand how many minimum number of bins i should choose so that i can get widely varied distribution among bins for different colors (red,green,yellow,blue,orange).
So, can somebody give me the link/post the image of Hue color wheel for openCV. I need something as shown below but the hue range in it is 0-360 and i need a color wheel used by opencv (i.e. 0-180 )
回答1:
in opencv, the hsv image has to fit into 3 8-bit channels, (no problem for S and V [0..255]) .
since H is in the [0..360] range, the actual values get divided by 2, so it fits into a uchar.
just divide any value in the diagram above by 2. ( or multiply the value you get from opencv )
来源：https://stackoverflow.com/questions/21737613/image-of-hsv-color-wheel-for-opencv