Thank you. I will follow your advice.
Dr. Eduardo Ortega
> Hi,
>
> For Fourier Shape Analysis, I never used it with real images ;-) , maybe
> you can have a look at the first 3-5 values, and compare them between
> leafs.
>
> Thomas
>
>
> David Randell a écrit :
> > On Sunday 08 June 2008 02:38:25 Eduardo Ortega Delgado wrote:
> >> Hello to everybody
> >> I am new with ImageJ list.
> >> I am interested to use ImageJ for shape analysis.
> >> I already have Fourier plugin, but do not know how to use it.
> >> I am interested to compare shapes of botanical organs, lets say leaves,
> >> flowers, etc.
> >> I will appreciate to receive any information on how to use ImageJ for
> that
> >> purpose of recomend me any web page were I can learn or a tutorial for
> >> that purpose.
> >> Best greetings and Thanks in advances
> >> Eduardo Ortega
> >
> > Hi Eduardo,
> >
> > Search for "Shock Graphs" and "medial-axis transform" using Google for a
> > starter. Both typically take a binary (silhouette) image or simple
> > non-intersecting closed curve and reduces the profile of a 2D object to a
> > skeleton, the topology/morphology of which can then be used to classify 2D
>
> > shapes.
> >
> > For a theoretical paper on this, see:
> >
http://www.cs.toronto.edu/~sven/Papers/iccv98-shocks.pdf> >
> > If you look in ImageJ you will find a mathematical morphology routine that
>
> > will extract a skeleton from a silhouette. But its worth noting different
> > skeletons can be extracted from the same image, depending on the algorithm
>
> > used. In this respect look up the plugins: BinaryThin_.class and
> > BinaryThin2_.class in Gabriel Landini's software written for ImageJ:
> >
> >
http://www.dentistry.bham.ac.uk/landinig/software/software.html> >
> > I know one person who successfully used shock-graphs to classify leaf
> > silhouettes, but do not have a reference to hand. As this was for part of a
>
> > thesis project, it may not have been published.
> >
> > Best regards,
> > Dave Randell
> >
> >
>
> --
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> Thomas Boudier, MCU Université Paris 6,
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>