|
|
| (2 intermediate revisions by one other user not shown) |
| Line 1: |
Line 1: |
| Apply a custom function to every pixel in an image. In this example, we rotate every vector in a 2D VectorImage by 90 degrees.
| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| | | }} |
| ==UnaryFunctorImageFilter.cxx==
| |
| <source lang="cpp">
| |
| #include "itkVectorImage.h"
| |
| #include "itkVector.h"
| |
| #include "itkVariableLengthVector.h"
| |
| #include "itkRigid2DTransform.h"
| |
| #include "itkUnaryFunctorImageFilter.h"
| |
| #include "vnl/vnl_math.h"
| |
| | |
| template< class TInput, class TOutput>
| |
| class RotateVectors
| |
| {
| |
| public:
| |
| RotateVectors() {};
| |
| ~RotateVectors() {};
| |
| bool operator!=( const RotateVectors & ) const
| |
| {
| |
| return false;
| |
| }
| |
| bool operator==( const RotateVectors & other ) const
| |
| {
| |
| return !(*this != other);
| |
| }
| |
| inline TOutput operator()( const TInput & A ) const
| |
| {
| |
| typedef itk::Vector<double, 2> VectorType;
| |
| VectorType v;
| |
| v[0] = A[0];
| |
| v[1] = A[1];
| |
|
| |
| typedef itk::Rigid2DTransform< float > TransformType;
| |
| | |
| TransformType::Pointer transform = TransformType::New();
| |
| transform->SetAngle(vnl_math::pi/2.0);
| |
| | |
| VectorType outputV = transform->TransformVector(v);
| |
| TOutput transformedVector;
| |
| transformedVector.SetSize(2);
| |
| transformedVector[0] = outputV[0];
| |
| transformedVector[1] = outputV[1];
| |
| | |
| return transformedVector;
| |
| }
| |
| };
| |
| | |
| int main(int, char *[])
| |
| {
| |
| typedef itk::VectorImage<float, 2> ImageType;
| |
| | |
| ImageType::RegionType region;
| |
| ImageType::IndexType start;
| |
| start[0] = 0;
| |
| start[1] = 0;
| |
| | |
| ImageType::SizeType size;
| |
| size[0] = 2;
| |
| size[1] = 3;
| |
| | |
| region.SetSize(size);
| |
| region.SetIndex(start);
| |
| | |
| ImageType::Pointer image = ImageType::New(); | |
| image->SetRegions(region);
| |
| image->SetVectorLength(2);
| |
| image->Allocate();
| |
| | |
| ImageType::IndexType pixelIndex;
| |
| pixelIndex[0] = 1;
| |
| pixelIndex[1] = 1;
| |
| | |
| typedef itk::VariableLengthVector<float> VectorType;
| |
| VectorType v;
| |
| v.SetSize(2);
| |
| v[0] = 1;
| |
| v[1] = 0;
| |
|
| |
| image->SetPixel(pixelIndex, v);
| |
|
| |
| typedef itk::UnaryFunctorImageFilter<ImageType,ImageType,
| |
| RotateVectors<
| |
| ImageType::PixelType,
| |
| ImageType::PixelType> > FilterType;
| |
| | |
| FilterType::Pointer filter = FilterType::New();
| |
| filter->SetInput(image);
| |
| filter->Update();
| |
| | |
| ImageType::PixelType inputPixelValue = image->GetPixel(pixelIndex);
| |
| ImageType::PixelType outputPixelValue = filter->GetOutput()->GetPixel(pixelIndex);
| |
| | |
| std::cout << "pixel (1,1) was = " << inputPixelValue << std::endl;
| |
| std::cout << "pixel (1,1) now = " << outputPixelValue << std::endl;
| |
| | |
| return EXIT_SUCCESS;
| |
| }
| |
| </source>
| |
| | |
| {{ITKCMakeLists|UnaryFunctorImageFilter}}
| |
