[Insight-users] co-occurrence matrix

[Luis Ibanez]

Hi Glenn,

Thanks for contributing your code to ITK.

The class has been added under

     Insight/Code/Numerics/Statistics.



Tha class name was changed in order to include "Adaptor".
It is now:

      itk::ImageToCooccurrenceListAdaptor



Some coding style changes were made. And the method
UseNeighbor was modified in order to work for N-D images.


A couple of minor coding style details, in ITK we use
the opening brackets in isolated lines, like

    for()
      {
      ....
      }


instead of

     for() {
     }

also,
the brackets are indented two spaces (never using tabs).

---

Your VTK question wasn't quite clear.

Do you want to take a VTK image and get a cooccurrence
matrix out of it using ITK ?

or, do you want to use VTK for visualizing the
cooccurrence matrix that you computed with ITK ?


Please let us know,


    Thanks


      Luis



------------------
Glenn Pierce wrote:
> Ok
> 
> I have a first version of a co occurrence filter.
> I sure there are many things I can improve.
> 
> The main problem is I have stored each pair in a ListSample (each pair
> as a new MeasurementVector).
> However, I need to increase the frequency of duplicate pairs. I wasn't
> sure how to efficiently find if a pair have already been stored and then
> increment the frequency of that pair.
> see line 76 of itkImageToCooccurenceList.txx
> 
> 
> I had to use quite a few typename constructs to remove compiler warnings
> of 'implicit typename' if anyone wonders about them.
> 
> 
> Also I inherited from ImageToListAdaptor
> but I am storing values in a ListSample that is a member of this
> class. This is different from the other adaptors as it is storing
> values. I don't know whether this is suitable for you?
> 
> Any suggestions of improving this filter. Even better itk method names
> etc would be great.
> 
> I eventually am going to use this to produced an co-occurrence image in
> vtk. Does anyone know how you can produce a grey level image with
> different intensity values for the pixels in vtk? I probably should ask
> on the vtk list -sorry.
> 
> 
> I have attached the filter and a small driver program.
> 
> Thanks for the help.
> 
> 
> Glenn
> 
> 
> On Fri, 2004-05-14 at 11:12 -0400, Luis Ibanez wrote:
> 
>>Hi Glenn,
>>
>>Thanks for the clarification.
>>
>>Well...
>>
>>     You probably will have to write that
>>     ImageToListAdaptor class after alll    :-)
>>
>>
>>I would suggest you to write it as a
>>
>>         ImageToListFilter
>>
>>
>>and take advantage of the Neighborhood
>>Iterators.  You probably can get very
>>close by looking at the code used for
>>the Morphological filters.
>>
>>Please read the Iterators chapter on
>>the SoftwareGuide. That will help you
>>find your way.
>>
>>It will be nice let the option to the
>>user for defining what neighbors to
>>use as cliques for the coorcurrence
>>matrix.
>>
>>Your filter will populate a List of
>>2D vector values having all the pairs
>>of cliques from your images.
>>
>>
>>Please let us know if you need any
>>help implementing this filter.
>>
>>and... of course, we will be happy
>>to get it back into the toolkit
>>once you are done   :-)
>>
> 
> 
>