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| The key of using SetRequestedRegion to tell a filter to only operate on a specified ImageRegion is to call SetRequestedRegion on the filters GetOutput(). That is, to tell the DerivativeImageFilter to only operate on a small region, you must do: | | {{warning|1=The media wiki content on this page is no longer maintained.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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| derivativeFilter->GetOutput()->SetRequestedRegion(smallRegion);
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| derivativeFilter->Update();
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| | |
| ==RequestedRegion.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkRandomImageSource.h"
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| #include "itkDerivativeImageFilter.h"
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| | |
| int main(int, char *[])
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| {
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| typedef itk::Image<float, 2> ImageType;
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| itk::Size<2> smallSize;
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| smallSize.Fill(10);
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| itk::Index<2> index;
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| index.Fill(0);
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| itk::ImageRegion<2> region(index, smallSize);
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| itk::Size<2> bigSize;
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| bigSize.Fill(10000);
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| itk::RandomImageSource<ImageType>::Pointer randomImageSource = itk::RandomImageSource<ImageType>::New();
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| randomImageSource->SetNumberOfThreads(1); // to produce non-random results
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| randomImageSource->SetSize(bigSize);
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| randomImageSource->GetOutput()->SetRequestedRegion(smallSize);
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| randomImageSource->Update();
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| std::cout << "Created random image." << std::endl;
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| typedef itk::DerivativeImageFilter<ImageType, ImageType > DerivativeImageFilterType;
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| DerivativeImageFilterType::Pointer derivativeFilter = DerivativeImageFilterType::New();
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| derivativeFilter->SetInput( randomImageSource->GetOutput() );
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| derivativeFilter->SetDirection(0); // "x" axis
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| derivativeFilter->GetOutput()->SetRequestedRegion(smallSize);
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| derivativeFilter->Update();
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| std::cout << "Computed derivative." << std::endl;
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| return EXIT_SUCCESS;
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| }
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| </source>
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| {{ITKCMakeLists|RequestedRegion}}
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