Task: fft Purpose: Fourier transform on image(s) Categories: uv analysis, map making FFT is a MIRIAD task that performs a fast Fourier transform on an image. If the input is a cube, then each plane is FFT'ed individually (i.e. this does not perform a 3D FFT). Blanked pixels in the input images are treated as zeroes. The input image dimensions will be padded to a power of two if necessary. The output of the FFT is normally complex-valued. You can save it in any one of several ways -- as the real or imaginary part, or as the magnitude (amplitude) and phase. Key: rin Input real image. No default. Key: iin Input imaginary image. The default is a zero image. Key: sign Sign of the exponent in the transform. -1 gives a a forward transform, +1 an inverse transform. The inverse transform applies 1/N scaling. The default is a forward transform. Key: center Origin of the transform. If two values are given they are used as the origin in the x and y axis respectively. If one value is given then it's used for the origin for both the x and y. The default is the header value for CRPIX1 and CRPIX2 or N/2+1 if they are not present in the header. Key: rout Output real image. Default is not to write it Key: iout Output imaginary image. Default is not to write it. Key: mag Output amplitude image. Default is not to write it. Key: phase Output phase image. Default is not to write it. Revision: 1.5, 2012/04/11 06:34:50 UTC

Generated by miriad@atnf.csiro.au on 21 Jun 2016