Re: Accurate edge detection?

This is not a simple task, even if you have opaque flat object and a
uniform back light behind it. Do not try solve really complicated prob
using simple methods. Let's try to imagine opague circle instead of
your knife. Lens and scanning system transforms this source object to
some grayscale image. Where the true edge should be placed, depends on
the source circle radius, savvy? It means, as a matter of fact, that
you shouldn't think about it as about an "edge detection problem".
This is the problem of restoration of a transformed image, and,
unfortunately, this is an incorrect one. Lots of very different source
images may produce similar results after transforming, so some
regularization is a must. It is possible for example, if you have an
opaque object with more or less smooth edges. What kind of objects do
you actually have? If you really need some assistance, send me some
sample image (not very big- my Net is very slow).