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| This examples runs the MedianImageFilter on a region of the image. It uses the RequestRegion to tell the filter which region to process. Then the example uses PasteImageFilter to paste the processed region into the original 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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| =ImageFilterOnARegion.cxx==
| | }} |
| <source lang="cpp">=
| |
| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkMedianImageFilter.h"
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| #include "itkPasteImageFilter.h"
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| #include "itkSubtractImageFilter.h"
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| | |
| #include "itksys/SystemTools.hxx"
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| | |
| #include <sstream>
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| | |
| #include "QuickView.h"
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| | |
| int main(int argc, char * argv[])
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| { | |
| // Verify command line arguments
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| if( argc < 2 )
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| {
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| std::cerr << "Usage: " << std::endl;
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| std::cerr << argv[0] << " InputImageFile [radius]" << std::endl;
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| return EXIT_FAILURE;
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| }
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| std::string inputFilename = argv[1];
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| | |
| // Setup types
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| typedef itk::Image<float, 2 > ImageType;
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| typedef itk::MedianImageFilter<ImageType, ImageType > FilterType;
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| typedef itk::SubtractImageFilter<ImageType> SubtractType;
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| typedef itk::PasteImageFilter<ImageType, ImageType > PasteType;
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| | |
| // Create and setup a reader
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName( inputFilename );
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| | |
| // Create and setup a median filter
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| FilterType::Pointer medianFilter = FilterType::New();
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| FilterType::InputSizeType radius;
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| radius.Fill(2);
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| if (argc > 2)
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| {
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| radius.Fill(atoi(argv[2]));
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| }
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| | |
| reader->Update();
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| | |
| itk::Size<2> processSize;
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| processSize[0] =
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| reader->GetOutput()->GetLargestPossibleRegion().GetSize()[0] / 2;
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| processSize[1] =
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| reader->GetOutput()->GetLargestPossibleRegion().GetSize()[1] / 2;
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|
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| itk::Index<2> processIndex;
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| processIndex[0] = processSize[0] / 2;
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| processIndex[1] = processSize[1] / 2;
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|
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| itk::ImageRegion<2> processRegion(processIndex, processSize);
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| | |
| medianFilter->SetRadius(radius);
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| medianFilter->SetInput( reader->GetOutput() );
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| medianFilter->GetOutput()->SetRequestedRegion( processRegion );
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| | |
| PasteType::Pointer pasteFilter = PasteType::New();
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| | |
| pasteFilter->SetSourceImage(medianFilter->GetOutput());
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| pasteFilter->SetSourceRegion(medianFilter->GetOutput()->GetRequestedRegion());
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| pasteFilter->SetDestinationImage(reader->GetOutput());
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| pasteFilter->SetDestinationIndex(processIndex);
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| | |
| SubtractType::Pointer diff = SubtractType::New();
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| diff->SetInput1(reader->GetOutput());
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| diff->SetInput2(pasteFilter->GetOutput());
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| | |
| QuickView viewer;
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| viewer.AddImage(
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| reader->GetOutput(),true,
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| itksys::SystemTools::GetFilenameName(inputFilename));
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| | |
| std::stringstream desc;
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| desc << "Median/PasteImageFilter, radius = " << radius;
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| viewer.AddImage(
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| pasteFilter->GetOutput(),
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| true,
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| desc.str());
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| | |
| std::stringstream desc2;
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| desc2 << "Original - Median/Paste"; | |
| viewer.AddImage(
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| diff->GetOutput(),
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| true,
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| desc2.str());
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| | |
| viewer.Visualize();
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| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| </source>
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| | |
| {{ITKVTKCMakeLists|ImageFilterOnARegion|}}
| |
