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Weird. I hadn't made the connection with Physics there. I suppose it is a general mathematical operator. Thanks!
by TheLoneWolfling 11y ago
Weird. I hadn't made the connection with Physics there. I suppose it is a general mathematical operator.
Thanks!
- a_e_k 11y agoYes, it's not exactly equivalent here but it's pretty close. Basically, Sobel kernels are analogous to the 1st derivative and the Laplacian is analogous to the 2nd. You'll also often see the Laplacian combined with a Gaussian (the "LoG" operator) for pre-smoothing since it tends to be particularly sensitive to any noise.
- TheLoneWolfling 11y agoBeing a second derivative, I suppose it would be. So does that mean that there are other kernels that approximate derivatives "better"? Like with finite differences?