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| ==InverseFFTImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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">
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| #include "itkImage.h"
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| #include "itkForwardFFTImageFilter.h"
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| #include "itkInverseFFTImageFilter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkImageFileReader.h"
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| #include "itkCastImageFilter.h"
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| #include "itkImageFileWriter.h"
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| | |
| typedef itk::Image<float, 2> FloatImageType;
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|
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| static void CreateImage(FloatImageType* const image);
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| | |
| int main(int argc, char*argv[])
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| { | |
| FloatImageType::Pointer image;
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| // Verify input
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| if(argc < 2)
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| {
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| image = FloatImageType::New();
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| CreateImage(image);
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| //std::cerr << "Required: filename" << std::endl;
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| //return EXIT_FAILURE;
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| }
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| else
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| {
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| // Read the image
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| typedef itk::ImageFileReader<FloatImageType> 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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| }
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| | |
| // Define some types
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| typedef itk::Image<unsigned char, 2> UnsignedCharImageType;
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| | |
| // Compute the FFT
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| typedef itk::ForwardFFTImageFilter<FloatImageType> FFTType;
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| FFTType::Pointer fftFilter = FFTType::New();
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| fftFilter->SetInput(image);
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| fftFilter->Update();
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| | |
| // Compute the IFFT
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| //typedef itk::InverseFFTImageFilter<FFTType::OutputImageType, UnsignedCharImageType> IFFTType; // This does not work - output type seems to need to be float, but it is just an error, not a concept check error...
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| typedef itk::InverseFFTImageFilter<FFTType::OutputImageType, FloatImageType> IFFTType;
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| IFFTType::Pointer ifftFilter = IFFTType::New();
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| ifftFilter->SetInput(fftFilter->GetOutput());
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| ifftFilter->Update();
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| | |
| // QuickView viewer;
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| // viewer.AddImage(image.GetPointer());
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| // viewer.AddImage(ifftFilter->GetOutput()); | |
| // viewer.Visualize();
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| | |
| typedef itk::CastImageFilter< FloatImageType, UnsignedCharImageType > CastFilterType; | |
| CastFilterType::Pointer castFilter = CastFilterType::New();
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| castFilter->SetInput(ifftFilter->GetOutput());
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| castFilter->Update();
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|
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| typedef itk::ImageFileWriter<UnsignedCharImageType> WriterType;
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| | |
| WriterType::Pointer writer = WriterType::New();
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| writer->SetFileName("ifft.png");
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| writer->SetInput(castFilter->GetOutput());
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| writer->Update();
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|
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| return EXIT_SUCCESS;
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| }
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| | |
| void CreateImage(FloatImageType* const image)
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| {
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| itk::Index<2> corner = {{0,0}};
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| itk::Size<2> size = {{200,200}};
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| itk::ImageRegion<2> region(corner, size);
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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(FloatImageType::IndexValueType r = 40; r < 100; r++)
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| {
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| for(FloatImageType::IndexValueType c = 40; c < 100; c++)
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| {
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| FloatImageType::IndexType pixelIndex = {{r,c}};
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| | |
| image->SetPixel(pixelIndex, 100);
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| }
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| }
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| }
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| | |
| </source>
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| {{ITKCMakeLists|{{SUBPAGENAME}}}}
| |
