[Insight-users] co-occurrence matrix

[Luis Ibanez]

Hi Glenn,

You can visualize the 2D histogram by first copying
its values in an itk::Image.

For this you can write a while() loop and use the
method

       histogram->GetFrequency( index );

Then you convert this ITK image into a VTK image
using the filter adaptors in

    InsightApplications/Auxiliary/vtk

and plug this vtkImageData into a vtkImageViewer.


---

We didnt' change the actual computation of your
List of measurement vectors.  More on this in a
following email...


  Regards,


    Luis



-------------------
Glenn Pierce wrote:

> On Sun, 2004-05-16 at 15:11 -0400, Luis Ibanez wrote:
> 
>>Hi Glenn,
>>
>>Thanks for contributing your code to ITK.
>>
>>The class has been added under
>>
>>     Insight/Code/Numerics/Statistics.
>>
>>
> 
> Thanks :)
> 
>>
>>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 ?
>>
> 
> I wanted to visualise the cooccurrence matrix with vtk as a grey scale 
> image.
> So I would be visualising  the frequency for each "pair of intensity 
> values". 
> So pairs that have a greater frequency appear as higher intensities in a 
> grey level image.
> 
> In my code I was storing each pair in it's own MeasurementVector. 
> However I should have
> been increasing the frequency for pairs that are the same. Was this 
> changed ?
> 
> 
> Thanks for the help.
> 
> Much appreciated
> 
> 
> Glenn
>