[Insight-users] how to define a filter's output smaller than input

[Renaud Isabelle]

Hi, 
 
I would like to define my own ExtractImageFilter, calling the itk::ExtractImageFilter inside.
 
I thought that I just have to call itkExtractImageFilter inside my GenerateData() method and graft the output, but I got errors at execution: it seems that I have to override some functions to specify that my output data is 2D whereas my input is of size 3D. 
 
Could you tell me which functions I have to override.  
 
   -  virtual void GenerateInputRequestedRegion();
   -  virtual void EnlargeOutputRequestedRegion(DataObject *output);
  -   virtual void GenerateOutputInformation()
 
??
 
As theses functions are already implemented in itkExtractImageFilter, I thought I don't have to override them, but apparently I am wrong. 
 
please help me,
 
Isabelle

		
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