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| Can't instantiate a GradientImageFilter with a vector image type?
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}} |
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| The compiler errors are: | |
| /home/doriad/src/ITK/Code/Common/itkConceptChecking.h: In member function ‘void itk::Concept::Convertible<T1, T2>::Constraints::constraints() [with T1 = itk::CovariantVector<float, 2u>, T2 = float]’:
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| /home/doriad/src/ITK/Code/Common/itkConceptChecking.h:192: instantiated from ‘itk::Concept::Convertible<itk::CovariantVector<float, 2u>, float>’
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| /home/doriad/src/ITK/Code/BasicFilters/itkGradientImageFilter.h:119: instantiated from ‘itk::GradientImageFilter<itk::Image<itk::CovariantVector<float, 2u>, 2u>, itk::CovariantVector<float, 2u>, float>’ | |
| /media/portable/Examples/c++/src/ITK/GradientOfVectorImage/GradientOfVectorImage.cxx:37: instantiated from here
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| /home/doriad/src/ITK/Code/Common/itkConceptChecking.h:185: error: invalid static_cast from type ‘itk::CovariantVector<float, 2u>’ to type ‘float’
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| ==GradientOfVectorImage.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkCovariantVector.h"
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| #include "itkGradientImageFilter.h"
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| #include "itkImageRegionIterator.h"
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| int main(int argc, char * argv[])
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| {
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| // Setup types
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| typedef itk::CovariantVector<float, 2> VectorType;
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| typedef itk::Image<VectorType, 2> VectorImageType;
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| VectorImageType::Pointer image = VectorImageType::New();
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| itk::Size<2> size;
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| size[0] = 5;
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| size[1] = 5;
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| itk::Index<2> index;
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| index[0] = 0;
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| index[1] = 0;
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| VectorImageType::RegionType region;
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| region.SetSize(size);
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| region.SetIndex(index);
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| image->SetRegions(region);
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| image->Allocate();
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| itk::ImageRegionIterator<VectorImageType> iterator(image, region);
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| while(!iterator.IsAtEnd())
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| {
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| }
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|
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| // Create and setup a gradient filter
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| typedef itk::GradientImageFilter<
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| VectorImageType, VectorType> GradientFilterType;
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| GradientFilterType::Pointer gradientFilter = GradientFilterType::New();
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| gradientFilter->SetInput(image);
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| gradientFilter->Update();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| {{ITKCMakeLists|{{SUBPAGENAME}}}}
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