Re: 2d polygon Fourier shape descriptors

Posted by Thomas Boudier on Nov 05, 2009; 8:23am
URL: http://imagej.273.s1.nabble.com/2d-polygon-Fourier-shape-descriptors-tp3690556p3690557.html

Hi,

I do not mind having the modified source so everybody can use it, I will
also have a look to the paper and if the implementation is not too
complicated I will give it a try.

cheers,

Thomas


Ben Tupper a écrit :

> Hello,
>
> I have been using Thomas Boudier's
> (http://www.snv.jussieu.fr/~wboudier/softs.html) Fourier_ plugin to get
> fourier shape descriptors.  It is new territory for me but the reference
> he cites  (http://www.bioss.ac.uk/staff/chris/ch6.pdf) and his code are
> *very* helpful.  I modified the code slightly to make the descriptors
> invariant to translation.  But from my simple tests with circles, the
> descriptors are not invariant to scale.  I haven't tested invariance
> with respect to rotation.
>
> So, in my search for more information on this I came across this paper
> "A Modified Fourier Descriptor for Shape Matching in MARS" by Yong Rui,
> Alfred C She, and Thomas S Huang
> (research.microsoft.com/en-us/um/people/yongrui/ps/sing97.pdf)  I think
> this describes the metrics I want (transformation invariant
> descriptors), but goodness what a work out for the uninitiated!
>
> I haven't found any references to a java implementation (or even better
> an ImageJ plugin).  In fact, I haven't found any implementations in nay
> language.  I thought it couldn't hurt to ask here before I wade in much
> deeper.  Anyone aware of an implementation of the Modified Fourier
> Descriptors in java?
>
>
> Thanks and cheers,
> Ben
>
>

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