Kirsch

The Kirsch Edge module detects edges using eight compass filters. All eight filters are applied to the image with the maximum being retained for the final image. The eight filters are a rotation of a basic compass convolution filter. The filters are of the form:

+3 +3 +3

+3 0 +3

-5 -5 -5

+3 +3 +3

-5 0 +3

-5 -5 +3

-5 +3 +3

-5 0 +3

-5 +3 +3

-5 -5 +3

-5 0 +3

+3 +3 +3

-5 -5 -5

+3 0 +3

+3 +3 +3

+3 -5 -5

+3 0 -5

+3 +3 +3

+3 +3 -5

+3 0 -5

+3 +3 -5

+3 +3 +3

+3 0 -5

+3 -5 -5

Example

Source Image Kirsch

For more information

Kirsch Operator
Edge and Contour Detection