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| <div class="floatcenter">[[File:ITK_Examples_Baseline_ImageProcessing_TestCropImageFilter.png]]</div>
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| ==Description==
| | }} |
| This example demonstrates how to crop an image. The SetBoundaryCropSize( cropSize ) method specifies the size of the boundary to be cropped at both the uppper & lower ends of the image - e.g. cropSize/2 pixels will be removed at both upper & lower extents.
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| ==Classes Demonstrated==
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| {{ITKDoxygenURL|CropImageFilter}} | |
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| ==Output==
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| The original image is displayed on the left. The cropped image is displayed on the right. | |
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| ==CropImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileWriter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkCropImageFilter.h"
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| #include "itkImageToVTKImageFilter.h"
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| #include "vtkImageViewer.h"
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| #include "vtkRenderWindowInteractor.h"
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| #include "vtkSmartPointer.h"
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| #include "vtkImageActor.h"
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| #include "vtkInteractorStyleImage.h"
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| #include "vtkRenderer.h"
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| typedef itk::Image<unsigned char, 2> ImageType;
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| static void CreateImage(ImageType::Pointer image);
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| int main(int, char *[])
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| {
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| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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| typedef itk::CropImageFilter <ImageType, ImageType>
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| CropImageFilterType;
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| CropImageFilterType::Pointer cropFilter
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| = CropImageFilterType::New();
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| cropFilter->SetInput(image);
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| // The SetBoundaryCropSize( cropSize ) method specifies the size of the boundary to
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| // be cropped at both the uppper & lower ends of the image
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| // eg. cropSize/2 pixels will be removed at both upper & lower extents
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| ImageType::SizeType cropSize = {10,14};
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| cropFilter->SetBoundaryCropSize(cropSize);
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| // The below three lines are equivalent to the above two lines:
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| //ImageType::SizeType halfCropSize = {5,7};
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| //cropFilter->SetUpperBoundaryCropSize(halfCropSize);
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| //cropFilter->SetLowerBoundaryCropSize(halfCropSize);
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| cropFilter->Update();
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| // Visualize first image
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| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
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| ConnectorType::Pointer originalConnector = ConnectorType::New();
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| originalConnector->SetInput(image);
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| vtkSmartPointer<vtkImageActor> originalActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| originalActor->SetInput(originalConnector->GetOutput());
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| // Visualize permuted image
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| ConnectorType::Pointer croppedConnector = ConnectorType::New();
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| croppedConnector->SetInput(cropFilter->GetOutput());
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| vtkSmartPointer<vtkImageActor> croppedActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| croppedActor->SetInput(croppedConnector->GetOutput());
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| // There will be one render window
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| vtkSmartPointer<vtkRenderWindow> renderWindow =
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| vtkSmartPointer<vtkRenderWindow>::New();
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| renderWindow->SetSize(600, 300);
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| vtkSmartPointer<vtkRenderWindowInteractor> interactor =
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| vtkSmartPointer<vtkRenderWindowInteractor>::New();
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| interactor->SetRenderWindow(renderWindow);
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| // Define viewport ranges
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| // (xmin, ymin, xmax, ymax)
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| double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
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| double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
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| // Setup both renderers
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| vtkSmartPointer<vtkRenderer> leftRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(leftRenderer);
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| leftRenderer->SetViewport(leftViewport);
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| leftRenderer->SetBackground(.6, .5, .4);
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| vtkSmartPointer<vtkRenderer> rightRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(rightRenderer);
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| rightRenderer->SetViewport(rightViewport); | |
| rightRenderer->SetBackground(.4, .5, .6);
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| // Add the sphere to the left and the cube to the right
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| leftRenderer->AddActor(originalActor);
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| rightRenderer->AddActor(croppedActor);
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| leftRenderer->ResetCamera();
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| rightRenderer->ResetCamera();
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| renderWindow->Render();
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| vtkSmartPointer<vtkInteractorStyleImage> style =
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| vtkSmartPointer<vtkInteractorStyleImage>::New();
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| interactor->SetInteractorStyle(style);
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| interactor->Start();
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| return EXIT_SUCCESS;
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| }
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| void CreateImage(ImageType::Pointer image)
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| {
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| // Create an image with 2 connected components
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| ImageType::RegionType region;
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| ImageType::IndexType start;
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| start[0] = 0;
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| start[1] = 0;
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| ImageType::SizeType size;
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| unsigned int NumRows = 200;
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| unsigned int NumCols = 300;
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| size[0] = NumRows;
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| size[1] = NumCols;
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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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| image->FillBuffer( 0 );
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| // Make a rectangle, centered at (100,150) with sides 160 & 240
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| // This provides a 20 x 30 border around the square for the crop filter to remove
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| for(unsigned int r = 20; r < 180; r++)
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| {
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| for(unsigned int c = 30; c < 270; c++)
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| {
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| ImageType::IndexType pixelIndex;
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| pixelIndex[0] = r;
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| pixelIndex[1] = c;
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|
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| image->SetPixel(pixelIndex, 200);
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| }
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| }
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| }
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| </source>
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| {{ITKVTKCMakeLists|CropImageFilter|}}
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