Optimally isotropic Laplacian operator.
Laplacian operators used in the literature for digital image processing are not rotationally invariant. We examine the anisotropy of 3 x 3 Laplacian operators for images quantized in square pixels, and find the operator which has the minimum overall anisotropy.
Kamgar-Parsi
B
B
Kamgar-Parsi
B
B
Rosenfeld
A
A