- #1

atrus_ovis

- 101

- 0

I'm reading this lecture pdf.

At end of page 1 , beginning of page 2 it says:

The spatial information obviously required for a registration method is provided by the

definition of a joint probability distribution that depends simultaneously on image A and B.

The conventional expression for it is pA,B (a, b). It is calculated as the number of times out

of the total number of pixels N that a pixel in A contains the value a and the same pixel

that is, the pixel in the same image position, in B contains the value b; this number of pixels

is then divided by the total number of pixels to give the joint probability of a, b.

Is this a bit vague, or am i missing something?

Since we are calculating frequency of the value a in the pixels of image A, when was the information about any position introduced?

Or does it mean that for *any* pixel in image A that contains the value a, check if the pixel(s) in image B at the corresponding position have the value b?

If this is too specific or too dependent on image processing,can you provide some material to build my intuition about joint probability distributions?

Thank you.