ITK/Examples/ImageProcessing/InvertIntensityImageFilter: Difference between revisions
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<div class="floatright">[[File:ITK_Examples_Baseline_ImageProcessing_TestInvertIntensityImageFilter.png]]</div> | |||
This example demonstrates how to invert the intensity of pixels by subtracting each pixel value from a specified maximum value. The output shows the original image and the inverted image. | This example demonstrates how to invert the intensity of pixels by subtracting each pixel value from a specified maximum value. The output shows the original image and the inverted image. | ||
Revision as of 20:41, 10 December 2010
This example demonstrates how to invert the intensity of pixels by subtracting each pixel value from a specified maximum value. The output shows the original image and the inverted image.
InvertIntensityImageFilter.cxx
<source lang="cpp">
- include "itkImage.h"
- include "itkRescaleIntensityImageFilter.h"
- include "itkInvertIntensityImageFilter.h"
- include "itkImageFileReader.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 CreateImage(ImageType::Pointer image);
int main(int, char *[]) {
ImageType::Pointer image = ImageType::New(); CreateImage(image);
typedef itk::InvertIntensityImageFilter <ImageType> InvertIntensityImageFilterType;
InvertIntensityImageFilterType::Pointer invertIntensityFilter = InvertIntensityImageFilterType::New(); invertIntensityFilter->SetInput(image); invertIntensityFilter->SetMaximum(50); invertIntensityFilter->Update();
// Visualize first image typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType; ConnectorType::Pointer originalConnector = ConnectorType::New(); originalConnector->SetInput(image);
vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New(); originalActor->SetInput(originalConnector->GetOutput());
// Visualize inverted image ConnectorType::Pointer invertedConnector = ConnectorType::New(); invertedConnector->SetInput(invertIntensityFilter->GetOutput());
vtkSmartPointer<vtkImageActor> invertedActor = vtkSmartPointer<vtkImageActor>::New(); invertedActor->SetInput(invertedConnector->GetOutput());
// There will be one render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300);
vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow);
// 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<vtkRenderer> leftRenderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(leftRenderer); leftRenderer->SetViewport(leftViewport); leftRenderer->SetBackground(.6, .5, .4);
vtkSmartPointer<vtkRenderer> rightRenderer = vtkSmartPointer<vtkRenderer>::New(); renderWindow->AddRenderer(rightRenderer); rightRenderer->SetViewport(rightViewport); rightRenderer->SetBackground(.4, .5, .6);
// Add the sphere to the left and the cube to the right leftRenderer->AddActor(originalActor); rightRenderer->AddActor(invertedActor);
leftRenderer->ResetCamera(); rightRenderer->ResetCamera();
renderWindow->Render();
vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); interactor->SetInteractorStyle(style);
interactor->Start();
return EXIT_SUCCESS;
}
void CreateImage(ImageType::Pointer image) {
// Create an image 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; size[1] = NumCols;
region.SetSize(size); region.SetIndex(start);
image->SetRegions(region); image->Allocate();
// Make a square for(unsigned int r = 40; r < 100; r++) { for(unsigned int c = 40; c < 100; c++) { ImageType::IndexType pixelIndex; pixelIndex[0] = r; pixelIndex[1] = c;
image->SetPixel(pixelIndex, 50); } }
} </source>
CMakeLists.txt
<source lang="cmake"> cmake_minimum_required(VERSION 2.6)
PROJECT(InvertIntensityImageFilter)
include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)
FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE})
FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})
ADD_EXECUTABLE(InvertIntensityImageFilter InvertIntensityImageFilter.cxx) TARGET_LINK_LIBRARIES(InvertIntensityImageFilter vtkHybrid ITKBasicFilters ITKCommon ITKIO)
</source>