Posted by
Kenneth Sloan-2 on
Jun 11, 2014; 9:45pm
URL: http://imagej.273.s1.nabble.com/Connecting-Two-Nearby-Edges-tp5008141p5008146.html
In my opinion, this problem is just on the other side of
the classic dividing line between “image processing” and
“scene analysis”. Almost always, “scene analysis” tends
to be very domain dependent and requires significantly different
data structures and processing than what is usually found
in ImageJ stuff.
When I need to do things like this, I make extensive use of
custom plugins which create a symbolic representation of the
features found by the image processing level…and then implement
custom algorithms which hardly ever go back to look at the
raw image (sometimes there is a “verification vision” step - but
less often than you might think).
So…I think the short answer is that you have gotten as far as you
can with vanilla ImageJ - and now you need to write some custom
programs, probably in Java. These can still run as ImageJ plugins,
but they won’t look much like all the plugins you see in
the typical ImageJ tutorial.
Looking at your sample images, and your intended “correct answer”, I think
you need to define WHY the blue segments are added, but not similar-looking
(to my eye) extensions of other linear features in the image - say, for example,
the short line at 4 o’clock from the small circular figure. These are the
kinds of decisions which usually depend crucially on domain-specific knowledge,
which makes it difficult to write a “general purpose” version of what you want.
If you are lucky, someone will now pipe up and embarrass me by pointing out
some existing ImageJ plugin that does precisely what you want. For your
sake, I hope so.
--
Kenneth Sloan
[hidden email]
On Jun 11, 2014, at 12:35 , James Male <
[hidden email]> wrote:
> Hello,
>
> I am trying to measure two different particles of a very similar brightness
> and have been attempting to do so by subtracting a canny edge detection
> image from the original image in order to create a white barrier between
> the two particles. However, the edge detected by the canny edge detector
> does not completely split the two regions. Is there any program I can run
> which will automatically connect nearby lines? For my purposes I cannot use
> manual tools such as the pencil.
>
> I have attached an image of the region I am talking about (circled in red)
> and an image of what I want the image to look like (drawn in blue).
>
> Thank you,
> James
>
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http://imagej.nih.gov/ij/list.html> <help region.png><help connected.png>
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