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