Re: question on edge detection

Posted by David Schaffer on Jan 19, 2018; 9:30pm
URL: http://imagej.273.s1.nabble.com/question-on-edge-detection-tp5019908p5019912.html

Thanks, Herbie.
I figured folks would want to see an example image.
OK, Here's one attached.
You can see some speckle, and some artifacts (actually other small
arteries orthogonal to the image plane).
There's one main artery in the image plane.
We chose the image plane so this is so.
The Canny edge detector, can to a pretty good job of suppressing
artifacts, but we also loose some of the desired edges.
So now we search for a way to fill in the lost edge segments.
I could also send an image with the Canny edges superimposed if that would help.

> As far as I understand, you are mainly interested in the widths of the
arteries.
We're really trying to extract the waveforms of each (left,right) edge
that's in the image.
We have a stack of these, and want to be able to extract the dynamics
of the artery walls (as they respond to heart pulses.

And we expect to have LOTS of such image sequences, so we'd love to
come up w a robust algorithm -- no manual inputs.
Needn't be truly general; just for our types of images.

Any help appreciated.
Thanks,
Dave

On Fri, Jan 19, 2018 at 9:39 AM, Herbie <[hidden email]> wrote:

> Dear Dave,
>
> without any sampe images it is extremely difficut, if not impossible, to
> judge the situation.
>
> What you write appears sound, but please let us see at least a *typical*,
> not the best, image and please tell us *exactly* where you define the artery
> edge because for colleagues who are not immediately involved in such
> research it is often quite difficult to come up with correct guesses ...
>
> If possible, don't provide jpg-image and please let us access images in
> original resolution.
>
> As far as I understand, you are mainly interested in the widths of the
> arteries.
>
> Regards
>
> Herbie
>
>
>
> --
> Sent from: http://imagej.1557.x6.nabble.com/
>
> --
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--
J. David Schaffer
Visiting Research Professor
College of Community and Public Affairs
Binghamton University
Binghamton, NY 13902-6000
[hidden email]
607-777-9145

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