[Insight-users] problem with defining public Filter objects

[Seniha Esen Yuksel]

Hi all,
I want to define a public filter in my function which I will use as a buffer to hold my images, but I am getting an exception error. Actually even before the exception error, I can see that the  output of the filter is empty, which makes me think that I am defining the RegionType in a wrong way -- could you please particularly look at that and tell me if it is correct?   I am copying parts of the code below from the header file and the c++ file. 
 
//------------------------------------------------------------------------------

//part of the code from my .h file:
//------------------------------------------------------------------------------
 

public:
 
// ........
 
//===================
//My ITK Object Pointers
//===================
    
  typedef int integer;
  typedef unsigned short      PixelType;
  typedef  unsigned char  InputPixelType;
  typedef  unsigned char  OutputPixelType;
  typedef itk::Image< InputPixelType,  2 >   InputImageType;
  typedef itk::Image< OutputPixelType, 2 >   OutputImageType;
  typedef itk::RegionOfInterestImageFilter<InputImageType, OutputImageType >  FilterType;
  typedef itk::ImageFileWriter< OutputImageType> WriterTypeGL;

  FilterType::Pointer filter; 
  WriterTypeGL::Pointer writergl;
 
 InputImageType::RegionType regionGL;
// ........
 
 
//------------------------------------------------------------------------------
//-------------------- part of my c++ code --------------------------
 
int FrontDialog::CropImage(){
 
//...........................
 
 writerMoving->SetFileName( output.c_str() );
 writerMoving->SetInput( cropMoving->GetOutput() );
 try {
         writerMoving->Update();
         }     catch (itk::ExceptionObject &err)         {
         std::cout<< "Exception caught:" << std::endl;
         std::cout<< err <<std::endl;
        
         return -1;
         }
 
//here I definitely know that cropMoving->GetOutput()  gives correct results
//because I am able to save it as an image. However, I also want to save it in a
//public variable to use over and over.
 
//here comes the part which fails:
 
 regionGL.SetSize(Width, Height);
 regionGL.SetIndex(0,0);

 filter = FilterType::New();
 filter->SetRegionOfInterest(regionGL);
 filter->SetInput( crop->GetOutput());
 try {
          filter->Update();
         }     catch (itk::ExceptionObject &err)         {
         std::cout<< "Exception caught:" << std::endl;
         std::cout<< err <<std::endl;
        
         return -1;
         }

 filter->GetOutput()->Print( std::cout );
 
//.............
return 0;
}
 
 
//-------------------------------------------------------------------
 
 
I spent too much time to figure out this problem but I am now clueless on what to do. The output of the exe file is as below.  I will really appreciate it a lot if anyone could help me...
Thanks a lot in advance,
Seniha
 
 
This program resizes the input file with the following parameters
x starting value: 300
y starting value: 300
x extension     : 200
y extension     : 200
===========================
images are cropped
Image (02695AA0)
  RTTI typeinfo:   class itk::Image<unsigned char,2>
  Reference Count: 1
  Modified Time: 236
  Debug: Off
  Observers:
    none
  Source: (02695B90)
  Source output index: 0
  Release Data: Off
  Data Released: False
  Global Release Data: Off
  PipelineMTime: 222
  UpdateMTime: 237
  LargestPossibleRegion:
    Dimension: 2
    Index: [0, 0]
    Size: [0, 0]
  BufferedRegion:
    Dimension: 2
    Index: [0, 0]
    Size: [0, 0]
  RequestedRegion:
    Dimension: 2
    Index: [0, 0]
    Size: [0, 0]
  Spacing: [1, 1]
  Origin: [300, 300]
  PixelContainer:
    ImportImageContainer (02694BE0)
      RTTI typeinfo:   class itk::ImportImageContainer<unsigned long,unsigned ch
ar>
      Reference Count: 1
      Modified Time: 235
      Debug: Off
      Observers:
        none
      Pointer: 02694C10
      Container manages memory: true
      Size: 0
      Capacity: 0
Exception caught:
itk::ExceptionObject (0109E4C0)
Location: "Unknown"
File: C:\ITK\InsightToolkit-2.0.0\InsightToolkit-2.0.0\Code\IO\itkPNGImageIO.cxx
Line: 395
Description: itk::ERROR: PNGImageIO(026955F0): PNG Writer can only write 2-dimen
sional images

 




Seniha Esen Yuksel 
Research Assistant 
Computer Vision and Image Processing Lab, 
Lutz Hall Rm 414, 
University of Louisville, 
Louisville, KY 
work ph: 502- 8521528 
home ph: 502- 8549856 
email: esen at cvip.uofl.edu // esenyuksel at ieee.org 
web: http://www.cvip.louisville.edu/~esen/

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