Better Skeletonization

Provides an alternative to the image toolbox skeletonization implemented in bwmorph.

Description

The files in this package comprise the Matlab implementation of a method for skeletonizing binary images. These are my own implementation
of a skeletonization method communicated to me by Alex Telea
(http://www.win.tue.nl/~alext/). See his papers for more details.

Skeletonization is (roughly speaking) the "thinning" of a binary image or silhouette to a one-pixel width spine. The image processing toolbox provides support for skeletonization via the bwmorph function, but its results do not always conform with our intuition. I have found that the approach used herein usually generates a more pleasing result.

There is also a routine for locating endpoints and junctions in skeletonized images.

(Note: This code has not been optimized for speed.)

Bug fix 7/18/07: In rare instances, isolated points would incorrectly be assigned an infinite value for skg.

• Acknowledgements: This submission has inspired the following:; tree labelling
• Required Products: Image Processing Toolbox
• MATLAB release: MATLAB 7.0.4 (R14SP2)

[Arvin Fan]

It works.

[Vincent Pelletier]

Nice. For me it turns out that anaskel is the useful routine after all. I'm glad I tried it!

[Scooter NGC]

 

[Jinghong Low]

Thanks for your contribution

[Luis Felipe]

Very good.

[Fadi Bazzi]

This thing do not work right. Can someone help me? I am getting those errors:

??? Attempt to execute SCRIPT skeleton as a function:
C:\Users\Fkb\Documents\MATLAB\test\skeleton.m

Error in ==> demo at 9
imshow(bwmorph(skeleton(img)>35,'skel',Inf));

[elden fisher]

it works. you have to modify and run first skeleton.m and anaskel.m as they contain absolute path to the two cpp files for compilation.

[Sravanti]

I am a Matlab novice, having said that, this code also doesn't work for me, i ran the mex setup, chose a compiler, changed the file path names in skeleton.m and anaskel.m to the correct ones for the cpp files (from the download) - do I need to make any modifications in the C-code? how does it read the image?
I get lots of errors from the .cpp files

[Casey Ta]

For those having trouble compiling skeleton.m and anaskel.m, I had the same issue at first. The Lcc-win32 C 2.4.1 compiler that comes with MATLAB wouldn't compile these files. You'll have to try a different compiler. These files compiled just fine for me after I chose Microsoft Visual Studio 2008 in mex -setup.

[Matt Fetterman]

It is very good. I have suggestions for additional features if you are interested in collaboration.

[Christopher MacMinn]

This package is very useful.

A question: does anyone know what the local radius values correspond to, or what units they are measured in? They are not in pixels.

[Christopher MacMinn]

With regard to my question above (15 Sep 2009), I think I've figured it out -- it looks like the local radius output of the function skeleton() is actually the radius SQUARED. Take the sqrt to get the radius in pixels.

[donny jason]

I have try other compiler.I'm using mic studio professional 2008. It seems it is still the same..
how to solve it?

[donny jason]

i got it already. It works. Thank you