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| This example demonstrates how to access a specified channel of a vector image as if it were a scalar image.
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| | | }} |
| ==NthElementImageAdaptor.cxx==
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| <source lang="cpp">
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| #include "itkImageAdaptor.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkNthElementImageAdaptor.h"
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| typedef itk::Image<itk::CovariantVector< float, 3>, 2> VectorImageType;
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| static void CreateImage(VectorImageType::Pointer image);
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| int main(int, char *[])
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| { | |
| VectorImageType::Pointer image = VectorImageType::New();
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| CreateImage(image);
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| itk::Index<2> index;
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| index.Fill(0);
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| std::cout << image->GetPixel(index) << std::endl;
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| typedef itk::NthElementImageAdaptor<VectorImageType,
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| float> ImageAdaptorType;
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| ImageAdaptorType::Pointer adaptor = ImageAdaptorType::New();
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| adaptor->SelectNthElement(0);
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| adaptor->SetImage(image);
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| std::cout << adaptor->GetPixel(index) << std::endl;
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| return EXIT_SUCCESS;
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| }
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| void CreateImage(VectorImageType::Pointer image)
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| {
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| VectorImageType::IndexType start;
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| start.Fill(0);
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| VectorImageType::SizeType size;
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| size.Fill(2);
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| VectorImageType::RegionType region;
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| region.SetSize(size);
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| region.SetIndex(start);
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| image->SetRegions(region);
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| image->Allocate();
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| // Create a pixel and fill it with (1,2,3), and set every pixel of the image to this pixel. | |
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| itk::ImageRegionIterator<VectorImageType> imageIterator(image,image->GetLargestPossibleRegion());
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| itk::CovariantVector<float, 3> vectorPixel;
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| vectorPixel[0] = 1;
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| vectorPixel[1] = 2;
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| vectorPixel[2] = 3;
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| image->FillBuffer(vectorPixel);
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| }
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| </source>
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| {{ITKCMakeLists|NthElementImageAdaptor}}
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