[Insight-users] itk::ImageIORegion::IndexType

[camille le men]

Answering myself, it seems I used setsize and setindex the same way the ones 
of itk::Image are used, and it seems the use is different.
I  now do not get any compilation nor executing error anymore but the image 
I get in output is all black... Hope I'll see the error I did.
I defined the ioregion as follows:
itk::ImageIORegion ioregion;
ioregion.SetSize( 0,2000);
ioregion.SetSize(1,3000);
ioregion.SetIndex( 0,0 );
ioregion.SetIndex( 1,0);
Sorry for disturbing!!
Camille.


>From: "camille le men" <camillelemen at hotmail.com>
>To: insight-users at itk.org
>Subject: [Insight-users] itk::ImageIORegion::IndexType
>Date: Mon, 05 Dec 2005 14:56:19 +0100
>
>Hi everybody!
>I want to read raw images. That is a file with no header. So, for the 
>reader to be able to read it, I need to provide it the size of my images. 
>In order to do so, I want to use the SetIORegion(IORegion) of ImageIOBase. 
>So I need to define the size and index of the IORegion to be able to pass 
>it as an argument of SetIORegion. I did that, the coresponding code is at 
>the end of the mail, But, I get a Segmentation fault error at the execution 
>time. It seems that the error is between those two lines: 
>itk::ImageIORegion::IndexType start;//std::cout works
>start[0] = 0;//std::cout doesn't work
>It must be a problem like: I did not well initialize "start", and since it 
>does not know how much space it needs for it, it does not reserve enough 
>and it overwrites memory or sthing like that. (Am I right so far? Please 
>tell me if U doubt!!) but I don't know how to do it, since there is no 
>dynamic constructor of it.
>I give U my code:
>
>#include "itkImageFileReader.h"
>#include "itkImageFileWriter.h"
>#include "itkRawImageIO.h"
>#include "itkImageIOBase.h"
>#include<iostream>
>#include "itkImage.h"
>#include "itkCastImageFilter.h"
>#include "itkPNGImageIO.h"
>int main( int argc, char ** argv )
>{
>if( argc < 3 )
>   {
>   std::cerr << "Usage: " << std::endl;
>   std::cerr << argv[0] << " inputImageFile  outputImageFile " << 
>std::endl;
>   return EXIT_FAILURE;
>   }
>typedef unsigned short      PixelType;
>const   unsigned int        Dimension = 2;
>typedef itk::Image< PixelType, Dimension >    ImageType;
>typedef unsigned char      PixelTypeOut;
>typedef itk::Image< PixelTypeOut, Dimension >    ImageTypeOut;
>typedef itk::ImageFileReader< ImageType >  ReaderType;
>typedef itk::ImageFileWriter< ImageTypeOut >  WriterType;
>typedef itk::RawImageIO<PixelType,Dimension> ImageIOType;
>typedef itk::PNGImageIO ImageIOTypeOut;
>typedef itk::CastImageFilter<ImageType,ImageTypeOut> CasterType;
>//typedef itk::ImageIORegion IORegionType;
>ImageIOType::Pointer RawIO = ImageIOType::New();
>RawIO->SetPixelType(itk::ImageIOBase::SCALAR);
>RawIO->SetNumberOfDimensions(2);
>RawIO->SetDimensions(0,3000);
>RawIO->SetDimensions(1,2000);
>RawIO->SetComponentType(itk::ImageIOBase::USHORT);
>
>RawIO->SetByteOrderToBigEndian();
>RawIO->SetFileTypeToASCII();
>ImageIOTypeOut::Pointer RawIOOut = ImageIOTypeOut::New();
>RawIOOut->SetPixelType(itk::ImageIOBase::SCALAR);
>RawIOOut->SetNumberOfDimensions(2);
>RawIOOut->SetDimensions(0,3000);
>RawIOOut->SetDimensions(1,2000);
>RawIOOut->SetComponentType(itk::ImageIOBase::UCHAR);
>
>itk::ImageIORegion::IndexType start;//cout works
>start[0] = 0;//cout  does not work
>start[1] = 0;
>itk::ImageIORegion::SizeType size;
>
>size[0] = 300;
>size[1] = 400;
>itk::ImageIORegion ioregion;
>
>ioregion.SetSize(  size  );
>ioregion.SetIndex( start );
>
>RawIOOut->SetIORegion(ioregion);
>
>ReaderType::Pointer reader = ReaderType::New();
>WriterType::Pointer writer = WriterType::New();
>
>reader->SetImageIO( RawIO );
>writer->SetImageIO( RawIOOut);
>
>const char * inputFilename  = argv[1];
>const char * outputFilename = argv[2];
>
>CasterType::Pointer caster = CasterType::New();
>
>reader->SetFileName( inputFilename  );
>writer->SetFileName( outputFilename );
>caster->SetInput( reader->GetOutput() );
>writer->SetInput( caster->GetOutput() );
>
>
>try
>   {
>   writer->Update();
>   }
>catch( itk::ExceptionObject & err )
>   {
>   std::cerr << "ExceptionObject caught !" << std::endl;
>   std::cerr << err << std::endl;
>   return EXIT_FAILURE;
>   }
>
>
>return EXIT_SUCCESS;
>}
>
>--
>
>ERROR: Segmentation Fault
>
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