Matrix of the diagonal sobel operator of size 3x3

Question

What is the matrix of sobel operator of size 3x3 if the operator is said to be diagonal (Left or right diagonal)? EDIT: or may be with more bigger size

Answer 1

The 3x3 diagonal Sobel operators are:

[[0,1,2],
 [-1,0,1],
 [-2,-1,0]]

and

[[-2,-1,0],
 [-1,0,1],
 [0,1,2]]

Hope it helps.