Learning conditional PDF’s
We can calculate P(R | skin) from a
set of training images
•It is simply
a histogram over the pixels in the training images
–each bin Ri contains the
proportion of skin pixels with color Ri
But this isn’t quite what we want
•Why not? How to
determine if a pixel is skin?
•We want P(skin | R) not P(R | skin)
•How can we get it?