The following describes the steps in edge detection with an LOG filter:
- First, the input image needs to be smoothed (by convolution with the Gaussian filter).
- Then, the smoothed image needs to be convolved with the Laplacian filter to obtain the output image as ∇2 (I (x,y) * G (x,y)).
- Finally the zero-crossings from the image obtained in the last step need to be computed, as shown in the following diagram:
