[Insight-users] using itkVoronoiSegmentationImageFilter ?

Tue, 22 Oct 2002 05:51:15 +0900 (KST)

Hi,
 Thanks for the help. It worked and segmented but not as I expected. I don't understand well about VoronoiSegmentationImageFilter but it seems to segment all similar color regions in whole image as the seed region. I just wanted to find more exact boundary of that found using FuzzyConnectednessScalarFilter.
 Anyway I think the VoronoiSegmentationImageFilter worked fine. What do you think about using DeformableMeshFilter instead of VoronoiSegmentationImageFilter?
 
 regards
 Seungbum Koo
 
 > Title : Re: [Insight-users] using itkVoronoiSegmentationImageFilter ?
 > Date : Sun, 20 Oct 2002 13:34:32 -0400
 > From : "Yinpeng Jin" <yj76@columbia.edu>
 > To : Seungbum Koo<koosb2@hanmail.net>,<insight-users@public.kitware.com>
 > 
 > if you use takeaprior, then you don't want to setMean and setVar, those two parameters will be calculated from the binary mask.
 > and 
 > try to use 
 > m_voronoiFilter->SetMeanPercentError(PERCENT);
 > m_voronoiFilter->SetVarPercentError(VARPERCENT);
 > in stead of 
 > m_voronoiFilter->SetMeanTolerance(10); 
 > m_voronoiFilter->SetVarTolerance(20); 
 > 
 > they are trying to manipulate the same parameter, but usually are more intuitive to figure.
 > the MeanPercentError could usually be set between 0.1 to 0.3
 > and the VarPercentError could be between 1 to 3. they don't depends on your pixel intensity range, while the MeanTolerance and VarTolerance usually do.
 > Also, you can first output your m_binaryImage to see if it is something reasonable. the VoronoisegmentationImagefilter will need something at least represents
 > parts of your target object as the a prior.
 > Try the above, and let me know what happens.
 > Yinpeng.
 > 
 > 
 > 
 > ----- Original Message ----- 
 > From: Seungbum Koo
 > To: insight-users@public.kitware.com 
 > Sent: Sunday, October 20, 2002 12:45 AM
 > Subject: [Insight-users] using itkVoronoiSegmentationImageFilter ?
 > 
 > 
 > Hi, 
 > 
 > I'm trying to use itkVoronoiSegmentationImageFilter combined with itkSimpleFuzzyConnectednessScalarImageFilter. 
 > 
 > I made a binary image from itkSimpleFuzzyConnectednessScalarImageFilter but I couldn't figure out how to set itkVoronoiSegmentationImageFilter variables. Here is my source code. 
 > 
 > ============================================================= 
 > m_voronoiFilter->SetInput(m_rawImageSource->GetOutput()); 
 > m_voronoiFilter->TakeAPrior(m_binaryImage); 
 > m_voronoiFilter->SetMean(520); 
 > m_voronoiFilter->SetVar(20); 
 > m_voronoiFilter->SetMeanTolerance(10); 
 > m_voronoiFilter->SetVarTolerance(20); 
 > // m_voronoiFilter->SetNumberOfSeeds(400); // ?? 
 > m_voronoiFilter->SetSteps(5); 
 > m_voronoiFilter->Update(); 
 > ============================================================= 
 > 
 > m_binaryImage is calculated from m_rawImageSource and as I expected. 
 > But this code just makes a black image... all zeros. 
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