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vlt.signal.fermi

  FERMI creates a 2D Fermi filter.
    FFILTER = vlt.signal.fermi(XDIM,CUTOFF,TRANS_WIDTH) calculates a 2D
      Fermi filter on a grid with dimensions XDIM * XDIM. 
     The cutoff frequency is defined by CUTOFF and represents
      the radius (in pixels) of the circular symmetric function   
      at which the amplitude drops below 0.5
     TRANS_WIDTH defines the width of the transition. 

     Author: Wally Block, UW-Madison  02/23/01. 

     Call: ffilter = vlt.signal.fermi(xdim, cutoff, trans_width);