Assume that we have a video sequence and want to detect moving shadows.

it is clear that image intensity in each(R,G,B) channels decrease in shadow because light source is partially blocked by a moving object. But, my question is how to find the amount of intensity changing in all channels. If, image intensity value in location x before shadow is (50,100,150) and now(there is a shadow) we know that intensity in R channel is 20. what is intensity in G and B channels?

is it (70,120) or (40,60) or anything else?

Thank in advance

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