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| <div class="floatright">[[File:ITK_Examples_Baseline_ImageProcessing_TestSubtractImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| ==SubtractImageFilter.cxx==
| | }} |
| <source lang="cpp">
| |
| #include "itkImage.h"
| |
| #include "itkImageFileWriter.h"
| |
| #include "itkRescaleIntensityImageFilter.h"
| |
| #include "itkSubtractImageFilter.h"
| |
| | |
| #include "itkImageToVTKImageFilter.h"
| |
| | |
| #include "vtkImageViewer.h"
| |
| #include "vtkRenderWindowInteractor.h"
| |
| #include "vtkSmartPointer.h"
| |
| #include "vtkImageActor.h"
| |
| #include "vtkInteractorStyleImage.h"
| |
| #include "vtkRenderer.h"
| |
| | |
| typedef itk::Image<unsigned char, 2> ImageType;
| |
| | |
| static void CreateImage1(ImageType::Pointer image);
| |
| static void CreateImage2(ImageType::Pointer image);
| |
| | |
| int main(int, char *[])
| |
| {
| |
| ImageType::Pointer image1 = ImageType::New();
| |
| CreateImage1(image1);
| |
| | |
| ImageType::Pointer image2 = ImageType::New();
| |
| CreateImage2(image2);
| |
| | |
| typedef itk::SubtractImageFilter <ImageType, ImageType >
| |
| SubtractImageFilterType;
| |
| | |
| SubtractImageFilterType::Pointer subtractFilter
| |
| = SubtractImageFilterType::New ();
| |
| subtractFilter->SetInput1(image1);
| |
| subtractFilter->SetInput2(image2);
| |
| subtractFilter->Update();
| |
| | |
| // Visualize first image
| |
| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
| |
| ConnectorType::Pointer connector1 = ConnectorType::New();
| |
| connector1->SetInput(image1);
| |
| | |
| vtkSmartPointer<vtkImageActor> actor1 =
| |
| vtkSmartPointer<vtkImageActor>::New();
| |
| actor1->SetInput(connector1->GetOutput());
| |
| | |
| // Visualize second image
| |
| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
| |
| ConnectorType::Pointer connector2 = ConnectorType::New();
| |
| connector2->SetInput(image2);
| |
| | |
| vtkSmartPointer<vtkImageActor> actor2 =
| |
| vtkSmartPointer<vtkImageActor>::New();
| |
| actor2->SetInput(connector2->GetOutput());
| |
| | |
| // Visualize subtracted image
| |
| ConnectorType::Pointer subtractConnector = ConnectorType::New();
| |
| subtractConnector->SetInput(subtractFilter->GetOutput());
| |
| | |
| vtkSmartPointer<vtkImageActor> subtractActor =
| |
| vtkSmartPointer<vtkImageActor>::New();
| |
| subtractActor->SetInput(subtractConnector->GetOutput());
| |
| | |
| // There will be one render window
| |
| vtkSmartPointer<vtkRenderWindow> renderWindow =
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| vtkSmartPointer<vtkRenderWindow>::New();
| |
| renderWindow->SetSize(900, 300);
| |
| | |
| vtkSmartPointer<vtkRenderWindowInteractor> interactor =
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| vtkSmartPointer<vtkRenderWindowInteractor>::New();
| |
| interactor->SetRenderWindow(renderWindow);
| |
| | |
| // Define viewport ranges
| |
| // (xmin, ymin, xmax, ymax)
| |
| double leftViewport[4] = {0.0, 0.0, 0.33, 1.0};
| |
| double centerViewport[4] = {0.33, 0.0, 0.66, 1.0};
| |
| double rightViewport[4] = {0.66, 0.0, 1.0, 1.0};
| |
| | |
| // Setup both renderers
| |
| vtkSmartPointer<vtkRenderer> leftRenderer =
| |
| vtkSmartPointer<vtkRenderer>::New();
| |
| renderWindow->AddRenderer(leftRenderer);
| |
| leftRenderer->SetViewport(leftViewport);
| |
| leftRenderer->SetBackground(.6, .5, .4);
| |
| | |
| vtkSmartPointer<vtkRenderer> centerRenderer =
| |
| vtkSmartPointer<vtkRenderer>::New();
| |
| renderWindow->AddRenderer(centerRenderer);
| |
| centerRenderer->SetViewport(centerViewport);
| |
| centerRenderer->SetBackground(.4, .5, .6);
| |
| | |
| vtkSmartPointer<vtkRenderer> rightRenderer = | |
| vtkSmartPointer<vtkRenderer>::New();
| |
| renderWindow->AddRenderer(rightRenderer);
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| rightRenderer->SetViewport(rightViewport);
| |
| rightRenderer->SetBackground(.4, .5, .6);
| |
| | |
| // Add the sphere to the left and the cube to the right
| |
| leftRenderer->AddActor(actor1);
| |
| centerRenderer->AddActor(actor2);
| |
| rightRenderer->AddActor(subtractActor);
| |
| | |
| leftRenderer->ResetCamera();
| |
| centerRenderer->ResetCamera();
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| rightRenderer->ResetCamera();
| |
| | |
| renderWindow->Render();
| |
| | |
| vtkSmartPointer<vtkInteractorStyleImage> style =
| |
| vtkSmartPointer<vtkInteractorStyleImage>::New();
| |
| interactor->SetInteractorStyle(style);
| |
| | |
| interactor->Start();
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| void CreateImage1(ImageType::Pointer image)
| |
| {
| |
| // Create an image with 2 connected components
| |
| ImageType::RegionType region;
| |
| ImageType::IndexType start;
| |
| start[0] = 0;
| |
| start[1] = 0;
| |
| | |
| ImageType::SizeType size;
| |
| unsigned int NumRows = 200;
| |
| unsigned int NumCols = 300;
| |
| size[0] = NumRows;
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| size[1] = NumCols;
| |
| | |
| region.SetSize(size);
| |
| region.SetIndex(start);
| |
| | |
| image->SetRegions(region);
| |
| image->Allocate();
| |
| | |
| // Make a square
| |
| for(unsigned int r = 20; r < 80; r++)
| |
| {
| |
| for(unsigned int c = 20; c < 80; c++)
| |
| {
| |
| ImageType::IndexType pixelIndex;
| |
| pixelIndex[0] = r;
| |
| pixelIndex[1] = c;
| |
| | |
| image->SetPixel(pixelIndex, 15);
| |
| }
| |
| }
| |
| }
| |
| | |
| | |
| void CreateImage2(ImageType::Pointer image)
| |
| {
| |
| // Create an image with 2 connected components
| |
| ImageType::RegionType region;
| |
| ImageType::IndexType start;
| |
| start[0] = 0;
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| start[1] = 0;
| |
| | |
| ImageType::SizeType size;
| |
| unsigned int NumRows = 200;
| |
| unsigned int NumCols = 300;
| |
| size[0] = NumRows;
| |
| size[1] = NumCols;
| |
| | |
| region.SetSize(size);
| |
| region.SetIndex(start);
| |
| | |
| image->SetRegions(region);
| |
| image->Allocate();
| |
| | |
| // Make another square
| |
| for(unsigned int r = 40; r < 100; r++)
| |
| {
| |
| for(unsigned int c = 40; c < 100; c++)
| |
| {
| |
| ImageType::IndexType pixelIndex;
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| pixelIndex[0] = r;
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| pixelIndex[1] = c;
| |
| | |
| image->SetPixel(pixelIndex, 15);
| |
| }
| |
| }
| |
| }
| |
| </source>
| |
| | |
| {{ITKVTKCMakeLists|SubtractImageFilter|}}
| |
