ITK/Release 4/Refactor Numerical Libraries/Inventory/Fourier Transforms

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The Problem

ITK obtains Fast Fourier Transform (FFT) functionalities from

  • VXL - as software included as third party library
  • FFTW - as a configuration time option

To choose between these two options you use, at CMake configuration time, the following variable


Where is the Code

ITK classes that provide FFT filters can be found in the Module: 

   ITK/Modules/Filtering/FFT

They include

  • itkFFTShiftImageFilter.h
  • itkFFTWForwardFFTImageFilter.h
  • itkFFTWInverseFFTImageFilter.h
  • itkForwardFFTImageFilter.h
  • itkInverseFFTImageFilter.h
  • itkVnlForwardFFTImageFilter.h
  • itkVnlInverseFFTImageFilter.h
  • vnl_fft_3d.h


VXL

The FFT code in VXL is in the directory 

 ITK/Modules/ThirdParty/VNL/src/vxl/core/vnl/algo

and include the following files

  • vnl_fft_1d.h
  • vnl_fft_1d.txx
  • vnl_fft_2d.h
  • vnl_fft_2d.txx
  • vnl_fft_base.h
  • vnl_fft_base.txx
  • vnl_fft.cxx
  • vnl_fft.h
  • vnl_fft_prime_factors.h
  • vnl_fft_prime_factors.txx

The code acepts images whose number of pixels is a multiple of powers of the following prime numbers:

  • 2
  • 3
  • 5

Benchmark Test

Options

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