Re: Accurate edge detection?

On Aug 2, 2:32=A0am, Andrew_M <m...@[EMAIL PROTECTED]
> wrote:
> > I haven't lost interest. =A0I don't understand illywacker's sarcasm of
> > "true researcher." =A0It would make more sense if he said "pure
> > researcher." =A0Commercial applied research that cannot be published
> > because of its proprietary nature is still true research but not pure
> > research. =A0On the other hand, most papers published in electrical
> > engineering journals represent pure research in the sense that their
> > findings have no foreseeable practical use. =A0For engineers, that is
> > immoral hypocrisy that deserves sarcasm. =A0And, IEEE typically
charges
> > $35 for you to buy a paper and then discover it is useless. =A0You
can'=
t
> > judge a paper by its abstract anymore than judge a book by its cover.
>
> Well, if so, what d'you think about my attempt to revert
> "irrevertible" transform? Probably, there was my sarcasm, not
> illywacker's one. It was my own experience of working with true-pure
> researchers. I do think that isn't a proper place to tell stories
> concerning my own live, but if t has some interest for you, I can send
> some words what I've just sent to =A0illywacker. But, let's return to
> our images. I've tryed to revert simple rectangular filter and was
> really surprized, that this one can be reverted too with low level of
> artifacts. I was afraid that this op requires more heavy (complicated,
> sophisticated- whichever term do you prefere) methods. At my old book
> this problem was named as "phase restoration problem". After
> diffraction one gets in fact amplitudes of a complex function, so this
> function to be restored requires info concerning its phase (to say
> nothing about the fact that hi frequence harmonics will be lost during
> direct transform). I did only 8 iteration to get my restored images
> despite of that in my book similar method requires 600 ones

I don't have an opinion because I never tried to deconvolve a similar
image.  However, if the results were of aesthetic im****tance, as in
the cases I typically deal with, I would be concerned with artifacts
in the areas surrounding the edges.

The best use of theory is in deciding which experiments to
perform.