**Fourier Transform Functions**

FFT |
Returns an image pair of the Fourier transform coefficients of
the input image |

InvFFT |
Returns an image calculated using the inverse Fourier transform
on the input FFT coefficient image pair |

ViewFFT |
Returns the pair of input images after they have been normalised
using a log scale, to improve their legibility |

FFTAdaptiveLP |
Returns the input pair of images after a ceiling threshold on
the input image values has been applied, reducing the effect of
high response frequencies |

FFTGaussian |
Returns an image pair of the user specified size, which are the
FFT coefficients of an image of a gaussian kernel with the user
specified standard deviation |

FFTDivide |
Returns an image pair of the division of the first input
coefficient images, by the second input coefficient images |

FFTMultiply |
Returns an image pair of the multiplication of the first input
coefficient images, by the second input coefficient images |

FFTLowPass |
Returns an image pair of the user specified low frequency
portion of the input image pair |

FFTHighPass |
Returns an image pair of the user specified high frequency
portion of the input image pair |

FFTBandPass |
Returns an image pair of the user specified mid frequency
portion of the input image pair |

FFTBandStop |
Returns the input image pair with the user specified mid
frequency portion of the input image pair set to zero |

FFTSelectivePass |
Returns the input image pair with a user specified portion of
the input image pair set to zero |