> 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
>
>
UMR 7101 / IFR 83. Bat A 328, Jussieu.