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| This example computes the squared difference between corresponding pixels. Note: This functionality is already available in SquaredDifferenceImageFilter. We simply use this as a simple operation to demonstrate the BinaryFunctorImageFilter.
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| | | }} |
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| ==BinaryFunctorImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkVectorImage.h"
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| #include "itkVector.h"
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| #include "itkVariableLengthVector.h"
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| #include "itkRigid2DTransform.h"
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| #include "itkBinaryFunctorImageFilter.h"
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| typedef itk::Image<float, 2> ImageType;
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| static void CreateImage(ImageType::Pointer image);
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| namespace Functor
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| {
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| template< class TPixel>
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| class MySquaredDifference
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| {
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| public:
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| MySquaredDifference() {}
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| ~MySquaredDifference() {}
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| bool operator!=(const MySquaredDifference &) const
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| {
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| return false;
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| }
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| bool operator==(const MySquaredDifference & other) const
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| {
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| return !( *this != other );
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| }
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| inline TPixel operator()(const TPixel & A,
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| const TPixel & B) const
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| {
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| const double dA = static_cast< double >( A );
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| const double dB = static_cast< double >( B );
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| const double diff = dA - dB;
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| return static_cast< TPixel >( diff * diff );
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| }
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| };
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| }
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| int main(int, char *[])
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| {
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| ImageType::Pointer image1 = ImageType::New();
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| CreateImage(image1);
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| image1->FillBuffer(2);
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| ImageType::Pointer image2 = ImageType::New();
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| CreateImage(image2);
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| image2->FillBuffer(5);
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|
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| typedef itk::BinaryFunctorImageFilter< ImageType, ImageType, ImageType,
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| Functor::MySquaredDifference<ImageType::PixelType> > FilterType;
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| FilterType::Pointer filter = FilterType::New();
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| filter->SetInput1(image1);
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| filter->SetInput2(image2);
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| filter->Update();
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| itk::Index<2> pixelIndex;
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| pixelIndex.Fill(0);
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|
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| ImageType::PixelType input1PixelValue = image1->GetPixel(pixelIndex);
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| ImageType::PixelType input2PixelValue = image2->GetPixel(pixelIndex);
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| ImageType::PixelType outputPixelValue = filter->GetOutput()->GetPixel(pixelIndex);
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| std::cout << "pixel1 was = " << input1PixelValue << std::endl;
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| std::cout << "pixel2 was = " << input2PixelValue << std::endl;
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| std::cout << "output is = " << outputPixelValue << std::endl;
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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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| ImageType::IndexType start;
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| start.Fill(0);
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|
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| ImageType::SizeType size;
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| size.Fill(10);
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| ImageType::RegionType region(start,size); | |
| image->SetRegions(region);
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| image->Allocate();
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| } | |
| </source>
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| | |
| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(BinaryFunctorImageFilter)
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(BinaryFunctorImageFilter BinaryFunctorImageFilter.cxx)
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| TARGET_LINK_LIBRARIES(BinaryFunctorImageFilter
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| ITKIO ITKBasicFilters ITKCommon
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| )
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| </source>
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