|
|
| Line 1: |
Line 1: |
| ==GradientImageFilter.cxx==
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| <source lang="cpp">
| |
| #include "itkImage.h"
| |
| #include "itkCovariantVector.h"
| |
| #include "itkImageFileReader.h"
| |
| #include "itkImageFileWriter.h"
| |
| #include "itkGradientImageFilter.h"
| |
| | |
| #include <itkImageToVTKImageFilter.h>
| |
| | |
| #include "vtkPointData.h"
| |
| #include "vtkFloatArray.h"
| |
| #include "vtkImageData.h"
| |
| #include "vtkRenderWindowInteractor.h"
| |
| #include "vtkRenderWindow.h"
| |
| #include "vtkSmartPointer.h"
| |
| #include "vtkImageActor.h"
| |
| #include "vtkActor.h"
| |
| #include "vtkInteractorStyleImage.h"
| |
| #include "vtkRenderer.h"
| |
| #include "vtkGlyph3DMapper.h"
| |
| #include "vtkArrowSource.h"
| |
| | |
| static void VectorImageToVTKImage(itk::Image<itk::CovariantVector<float, 2>, 2>::Pointer vectorImage, vtkImageData* VTKImage);
| |
| | |
| int main(int argc, char * argv[])
| |
| { | |
| // Verify command line arguments
| |
| if( argc < 2 )
| |
| {
| |
| std::cerr << "Usage: " << std::endl;
| |
| std::cerr << argv[0] << "inputImageFile" << std::endl;
| |
| return EXIT_FAILURE;
| |
| }
| |
| | |
| // Parse command line arguments
| |
| std::string inputFilename = argv[1];
| |
| | |
| // Setup types
| |
| typedef itk::Image< float, 2 > FloatImageType;
| |
| typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;
| |
| | |
| // Create and setup a reader
| |
| typedef itk::ImageFileReader< UnsignedCharImageType > ReaderType;
| |
| ReaderType::Pointer reader = ReaderType::New();
| |
| reader->SetFileName( inputFilename.c_str() );
| |
|
| |
| // Create and setup a gradient filter
| |
| typedef itk::GradientImageFilter<
| |
| UnsignedCharImageType, float> GradientFilterType;
| |
| GradientFilterType::Pointer gradientFilter = GradientFilterType::New();
| |
| gradientFilter->SetInput( reader->GetOutput() );
| |
| gradientFilter->Update();
| |
| | |
| // Visualize original image
| |
| typedef itk::ImageToVTKImageFilter<UnsignedCharImageType> ConnectorType;
| |
| ConnectorType::Pointer originalConnector = ConnectorType::New();
| |
| originalConnector->SetInput(reader->GetOutput());
| |
| | |
| vtkSmartPointer<vtkImageActor> originalActor =
| |
| vtkSmartPointer<vtkImageActor>::New();
| |
| originalActor->SetInput(originalConnector->GetOutput());
| |
| | |
| // Visualize gradient
| |
| vtkSmartPointer<vtkImageData> gradientImage =
| |
| vtkSmartPointer<vtkImageData>::New();
| |
| VectorImageToVTKImage(gradientFilter->GetOutput(), gradientImage);
| |
|
| |
| vtkSmartPointer<vtkArrowSource> arrowSource =
| |
| vtkSmartPointer<vtkArrowSource>::New();
| |
|
| |
| vtkSmartPointer<vtkGlyph3DMapper> gradientMapper =
| |
| vtkSmartPointer<vtkGlyph3DMapper>::New();
| |
| gradientMapper->ScalingOn();
| |
| gradientMapper->SetScaleFactor(.05);
| |
| gradientMapper->SetSourceConnection(arrowSource->GetOutputPort());
| |
| gradientMapper->SetInputConnection(gradientImage->GetProducerPort());
| |
| gradientMapper->Update();
| |
| | |
| vtkSmartPointer<vtkActor> gradientActor =
| |
| vtkSmartPointer<vtkActor>::New();
| |
| gradientActor->SetMapper(gradientMapper);
| |
| | |
| // Visualize
| |
| // Define viewport ranges
| |
| // (xmin, ymin, xmax, ymax)
| |
| double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
| |
| double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; | |
| | |
| // Setup both renderers
| |
| vtkSmartPointer<vtkRenderWindow> renderWindow =
| |
| vtkSmartPointer<vtkRenderWindow>::New();
| |
| renderWindow->SetSize(600,300);
| |
| | |
| vtkSmartPointer<vtkRenderer> leftRenderer =
| |
| vtkSmartPointer<vtkRenderer>::New();
| |
| renderWindow->AddRenderer(leftRenderer);
| |
| leftRenderer->SetViewport(leftViewport);
| |
| | |
| vtkSmartPointer<vtkRenderer> rightRenderer =
| |
| vtkSmartPointer<vtkRenderer>::New();
| |
| renderWindow->AddRenderer(rightRenderer);
| |
| rightRenderer->SetViewport(rightViewport);
| |
| rightRenderer->SetBackground(1,0,0);
| |
| | |
| leftRenderer->AddActor(originalActor);
| |
| rightRenderer->AddActor(gradientActor);
| |
| | |
| vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
| |
| vtkSmartPointer<vtkRenderWindowInteractor>::New();
| |
| | |
| vtkSmartPointer<vtkInteractorStyleImage> style =
| |
| vtkSmartPointer<vtkInteractorStyleImage>::New();
| |
| renderWindowInteractor->SetInteractorStyle(style);
| |
| | |
| renderWindowInteractor->SetRenderWindow(renderWindow);
| |
| renderWindowInteractor->Initialize();
| |
| | |
| renderWindowInteractor->Start();
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| | |
| void VectorImageToVTKImage(itk::Image<itk::CovariantVector<float, 2>, 2>::Pointer vectorImage, vtkImageData* VTKImage)
| |
| {
| |
| itk::Image<itk::CovariantVector<float, 2>, 2>::RegionType region = vectorImage->GetLargestPossibleRegion();
| |
| itk::Image<itk::CovariantVector<float, 2>, 2>::SizeType imageSize = region.GetSize();
| |
| VTKImage->SetExtent(0, imageSize[0] -1, 0, imageSize[1] - 1, 0, 0);
| |
| | |
| vtkSmartPointer<vtkFloatArray> vectors =
| |
| vtkSmartPointer<vtkFloatArray>::New();
| |
| vectors->SetNumberOfComponents(3);
| |
| vectors->SetNumberOfTuples(imageSize[0] * imageSize[1]);
| |
| vectors->SetName("GradientVectors");
| |
| | |
| int counter = 0;
| |
| for(unsigned int j = 0; j < imageSize[1]; j++)
| |
| {
| |
| for(unsigned int i = 0; i < imageSize[0]; i++)
| |
| {
| |
| itk::Image<itk::CovariantVector<float, 2>, 2>::IndexType index;
| |
| index[0] = i;
| |
| index[1] = j;
| |
| | |
| itk::Image<itk::CovariantVector<float, 2>, 2>::PixelType pixel = vectorImage->GetPixel(index);
| |
|
| |
| float v[2];
| |
| v[0] = pixel[0];
| |
| v[1] = pixel[1];
| |
| v[2] = 0;
| |
| vectors->InsertTupleValue(counter, v);
| |
| counter++;
| |
| }
| |
| }
| |
| //std::cout << region << std::endl;
| |
|
| |
| VTKImage->GetPointData()->SetVectors(vectors);
| |
| }
| |
| </source>
| |
| | |
| {{ITKVTKCMakeLists|{{SUBPAGENAME}}}}
| |
