A long, long time ago I did have an EDGE task on my list of KAPPA
enhancements, which would include the popular algorithms of the day such
as Sobel, Canny, Marr-Hildreth, and Prewitt. However, there was no
demand from Starlink users for edge detectors.
MEDIAN is close in that it offers a way to define the kernel through
parameters, but it finds the median not the sum in the kernel.
I suppose that the Laplacian (LAPLACE) is too crude if you have noisy
data. In terms of quality Sobel is a middle ranking operator. If I
were to add one more edge detector to KAPPA it would be Canny or
Marr-Hildreth.
Malcolm
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