VALUE img_fwfft(VALUE);
VALUE img_invfft(VALUE);
VALUE img_rotquad(VALUE);
VALUE img_invfftr(VALUE);
VALUE img_s_fmask_ideal_highpass(VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_ideal_lowpass(VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_butterworth_highpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_butterworth_lowpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_gauss_highpass(VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_gauss_lowpass(VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_ideal_ringpass(VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_ideal_ringreject(VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_butterworth_ringpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_butterworth_ringreject(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_gauss_ringpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_gauss_ringreject(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_ideal_bandpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_ideal_bandreject(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_butterworth_bandpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_butterworth_bandreject(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_gauss_bandpass(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_gauss_bandreject(VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
VALUE img_s_fmask_fractal_flt(VALUE, VALUE, VALUE, VALUE);
VALUE img_freqflt(VALUE, VALUE);
VALUE img_disp_ps(VALUE);
VALUE img_phasecor_fft(VALUE, VALUE);
VALUE img_s_fractsurf(VALUE, VALUE, VALUE);