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| <div class="floatcenter">[[File:ITK_Examples_Baseline_ImageProcessing_TestInvertIntensityImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| 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==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkInvertIntensityImageFilter.h"
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| #include "itkImageFileReader.h"
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| #include "QuickView.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 argc, char *argv[])
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| { | |
| ImageType::Pointer image = ImageType::New();
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| std::stringstream desc;
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| CreateImage(image);
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| unsigned int maximum = 255;
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| if (argc > 1)
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| {
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName( argv[1] );
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| reader->Update();
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| image = reader->GetOutput();
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| desc << itksys::SystemTools::GetFilenameName(argv[1]);
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| if (argc > 2)
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| {
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| maximum = atoi(argv[2]);
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| }
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| }
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| else
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| {
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| CreateImage(image);
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| desc << "Synthetic image";
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| maximum = 50;
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| }
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| | |
| typedef itk::InvertIntensityImageFilter <ImageType>
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| InvertIntensityImageFilterType;
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| InvertIntensityImageFilterType::Pointer invertIntensityFilter
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| = InvertIntensityImageFilterType::New();
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| invertIntensityFilter->SetInput(image);
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| invertIntensityFilter->SetMaximum(maximum);
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| QuickView viewer;
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| viewer.AddImage(
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| image.GetPointer(),
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| true,
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| desc.str());
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| std::stringstream desc2;
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| desc2 << "InvertIntensity, maximum = " << maximum;
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| viewer.AddImage(
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| invertIntensityFilter->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;
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| }
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| | |
| void CreateImage(ImageType::Pointer image)
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| {
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| // Create an image
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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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| // Make a square
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| for(unsigned int r = 40; r < 100; r++) | |
| {
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| for(unsigned int c = 40; c < 100; 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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| | |
| image->SetPixel(pixelIndex, 50);
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| }
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| }
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| }
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| </source>
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| {{ITKVTKCMakeLists|{{SUBPAGENAME}}}}
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