[ITK] [ITK-users] Setting tolerance is ignored

[Chr. Rossmanith]

SetCoordinateTolerance() is what I've been looking for.

Thanks,
Christina

On 21.09.2016 15:00, Lowekamp, Bradley (NIH/NLM/LHC) [C] wrote:
> Hello,
>
> This is behaving as designed.
>
> The “GlobalDefaultCoordinateTolerance” is the default value used when objects are constructed. Use case would be::
>
> typedef itk::MaskImageFilter< ImageType, ImageType > FilterType;
> FilterType::SetGlobalDefaultCoordinateTolerance(0.001);
> FilterType::Pointer filter = FilterType::New();
>
> This would set the default tolerance for ALL new ImageFilters.
>
> What you may want to do is use SetCoordinateTolerance() on your constructed filter to set the value for just that one filter.
>
> HTH,
> Brad
>
>> On Sep 21, 2016, at 5:05 AM, Chr. Rossmanith <cr at neuro.ma.uni-heidelberg.de> wrote:
>>
>> Hi,
>>
>> I have two images with slightly differing image origins:
>>
>> InputImage Origin: [-7.9896713e+01, -7.0397179e+01, 0.0000000e+00]
>> InputImage_1 Origin: [-7.9896706e+01, -7.0397186e+01, 0.0000000e+00]
>>
>> which are used as input for MaskImageFilter. Processing fails with the error "Inputs do not occupy the same physical space!" and tolerance being reported as 4.6875000e-07 even if I set it to 0.001 by filter->SetGlobalDefaultCoordinateTolerance( 0.001 ).
>>
>> If itkImageToImageFilter would call GetGlobalDefaultCoordinateTolerance() instead of using this->m_CoordinateTolerance in VerifyInputInformation() the user defined tolerance is used.
>>
>> Is this a bug or is the current behaviour intended?
>>
>> Regards,
>> Christina Rossmanith
>> --
>> Dept. of Neurology
>> University Medicine Mannheim
>> University of Heidelberg
>>
>>
>> --------------------------------------------- Code ----------------------------------------------------------------------------
>>
>> #include "itkImageFileReader.h"
>> #include "itkMaskImageFilter.h"
>>
>> int main (int argc, char *argv[])
>> {
>>   const unsigned int Dimension = 3;
>>   typedef short PixelType;
>>   typedef itk::Image< PixelType, Dimension > ImageType;
>>
>>   typedef itk::ImageFileReader< ImageType > ReaderType;
>>   ReaderType::Pointer reader = ReaderType::New();
>>   reader->SetFileName( argv[1] );
>>   reader->Update();
>>   ReaderType::Pointer mask = ReaderType::New();
>>   mask->SetFileName( argv[2] );
>>   mask->Update();
>>
>>   typedef itk::MaskImageFilter< ImageType, ImageType > FilterType;
>>   FilterType::Pointer filter = FilterType::New();
>>   filter->SetGlobalDefaultCoordinateTolerance( 0.001 );
>>   filter->SetInput1( reader->GetOutput() );
>>   filter->SetInput2( mask->GetOutput() );
>>
>>   try
>>     {
>>       filter->Update();
>>     }
>>   catch ( itk::ExceptionObject & e )
>>     {
>>       std::cout << "MaskImageFilter failed: " << e << std::endl;
>>       return EXIT_FAILURE;
>>     }
>>
>>   return EXIT_SUCCESS;
>> }
>>
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