Treating Hue as a normal distribution is wrong. You should use wrapped normal distribution instead.

[philip-bl]

Hi. I think your way of estimating Hue mean and variance in HSV color space is incorrect. I am only talking about HSV because I haven't read about the other two color spaces yet. Hue values live on a circle - the values in [0, 1) correspond to the circle, the values 0 and 1 are infinitely close. Your method treats them as if they are very far apart when you simply use array.mean() and array.std() to estimate the stats. This corresponds to estimating the parameters of a normal distribution. Instead, you should treat Hue as if it was sampled from a wrapped normal distribution. You can use https://en.wikipedia.org/wiki/Wrapped_normal_distribution#Estimation_of_parameters to estimate its mean and std.