Laplacian filter matlab edge detection

1. Can Laplacian of Gaussian filter detect edges?
2. How Laplacian is used in edge detection?
3. How does Matlab calculate Laplacian?

Can Laplacian of Gaussian filter detect edges?

Laplacian of Gaussian (LoG) Filter - useful for finding edges - also useful for finding blobs! Sharp changes in gray level of the input image correspond to “peaks or valleys” of the first-derivative of the input signal.

How Laplacian is used in edge detection?

A Laplacian filter is an edge detector used to compute the second derivatives of an image, measuring the rate at which the first derivatives change. This determines if a change in adjacent pixel values is from an edge or continuous progression.

How does Matlab calculate Laplacian?

Calculate the Laplacian of U using del2 . Use the domain vector x to define the 1-D coordinate of each point in U . L = 4*del2(U,x); Analytically, the Laplacian of this function is equal to Δ U = - cos ( x ) .