Krisch Compass Mask
Kirsch compass mask is used for finding edges. It is almost the same as Robinson compass mask. It also has 8 direction compass. The main difference between Robinson and kirsch compass masks is that in kirsch we can change the mask according to the requirements.
Following are its eight orientations:
Standard size is taken and then it is rotated in all directions.
Following is a mask which is in north direction and the rotated:
Example of Kirsch compass mask applied to an image
The maximum gradient in the 8 directions