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# 4.6 Frequency filtering

    static VImage create_fmask( int, int, int,
      double, double, double, double, double );
    VImage disp_ps();
    VImage flt_image_freq( int, double, double,
      double, double, double );
    static VImage fractsurf( int, double );
    VImage freqflt( VImage );
    VImage fwfft();
    VImage rotquad();
    VImage invfft();
    VImage invfftr();