[Insight-users] Error In segmented region size by using itkRelabelComponentImageFilter.

[yasser salman]

hi Miller .., 
thanx for ur reply but i'm acutally never use
itkRelabelComponentImageFilter before , so i'm sure
about it's input and output, also how can i get the
size of the segmented region ( or labeled region) by
using this filter
so i try this code , for sure need a modification coz
i had this error message:  

" error C2664: 'void __thiscall
itk::ImageToImageFilter<class itk::Image<unsigned
short,3>,class itk::Image<unsigned short,3>
>::SetInput(const class itk::Image<unsigned short,3>
*)' : cannot convert parameter
 1 from 'class itk::Image<unsigned short,3> *(unsigned
int)' to 'const class itk::Image<unsigned short,3> *'
        Context does not allow for disambiguation of
overloaded function"



 typedef unsigned short   InputPixelType;
 typedef float        InternalPixelType;
 typedef unsigned short   SegmentedPixelType;

  typedef itk::Image< InputPixelType, 3 >        
InputImageType;
  typedef itk::Image< InternalPixelType, 3>      
InternalImageType;
  typedef itk::Image< SegmentedPixelType, 3 >    
SegmentedImageType;


  typedef itk::ConnectedThresholdImageFilter< 
			InternalImageType, SegmentedImageType >
ConnectedFilterType;
  
  typedef itk::ImageToVTKImageFilter<
SegmentedImageType >  
			ITK2VTKConnectorFilterType;

  typedef itk::VTKImageToImageFilter< InputImageType  
  >  
            VTK2ITKConnectorFilterType;

  typedef
itk::RelabelComponentImageFilter<SegmentedImageType,SegmentedImageType>
RelabelImageFilter;
  ReaderType::Pointer reader = ReaderType::New();


rcfilter->SetInput(connectedThreshold->GetOutput);
rcfilter->Update();
  ITK2VTKconnector->SetInput(rcfilter ->GetOutput());
 
ITK2VTKconnector->GetImporter()->SetDataScalarTypeToUnsignedChar();

thanx 

yasser s.,

--- "Miller, James V (Research)" <millerjv at crd.ge.com>
wrote:
> You could use the RelabelComponentImageFilter. 
> Given a segmented image, 
> it relabels it such that label 1 is the largest
> object, label 2 is the next
> largest object, etc.  Once the relabeling has been
> performed, you can query 
> the size of a labelled object in terms of number of
> pixels or volume.
> 
> It is a bit of an overkill for the output of the
> ConnectedThreshold.  We
> could add a similar API to the segmentation
> algorithms. By having the
> capability in another filter, we have factored out
> the capability so it can
> used on the output 
> of any of the segmentation algorithms.
> 
> Jim
> 
> 
> 
> -----Original Message-----
> From: yasser salman [mailto:yass71 at yahoo.com]
> Sent: Monday, April 12, 2004 1:53 PM
> To: insight-users at itk.org
> Cc: Luis Ibanez
> Subject: [Insight-users] segmented region size..
> 
> 
> hi all  .., 
> how can i get the region size  (or No. of pixels)
> after segmentation ,
> the code below give me the whole voulme size 256 x
> 256
> x19  i need only the segmented region .., 
> connectedThreshold->Update(); 
> ImageType::ConstPointer image  =
> connectedThreshold->GetOutput();
> ImageType::RegionType   region =
> image->GetBufferedRegion();
> ImageType::SizeType     size   = region.GetSize();
> 
> 
> thanx ,, 
> yasser
> 
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