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cooccurrence matrix

mathematics Given a position operator P(i,j), let A be a nxn

matrix whose element A[i][j] is the number of times that

points with grey level (intensity) g[i] occur, in the position

specified by P, relative to points with grey level g[j]. Let

C be the nxn matrix that is produced by dividing A with the

total number of point pairs that satisfy P. C[i][j] is a

measure of the joint probability that a pair of points

satisfying P will have values g[i], g[j]. C is called a

cooccurrence matrix defined by P. Examples for the operator P

are: "i above j", "i one position to the right and two below

j", etc.