| ::convol_fft | Convolve an image with a byte-mask in the frequency domain. |
| ::convol_gabor | Convolve an image with a Gabor filter in the frequency domain. |
| ::energy_gabor | Calculate the energy of a two-channel image. |
| ::fft_generic | Compute the fast Fourier transform of an image. |
| ::fft_image | Compute the fast Fourier transform of an image. |
| ::fft_image_inv | Compute the inverse fast Fourier transform of an image. |
| ::gen_bandfilter | Generate an ideal band filter. |
| ::gen_bandpass | Generate an ideal bandpass filter. |
| ::gen_filter_mask | Store a filter mask in the spatial domain as a real-image. |
| ::gen_gabor | Generate a Gabor filter. |
| ::gen_highpass | Generate an ideal highpass filter. |
| ::gen_lowpass | Generate an ideal lowpass filter. |
| ::gen_sin_bandpass | Generate a bandpass filter with sinusoidal shape. |
| ::gen_std_bandpass | Generate a bandpass filter with Gaussian or sinusoidal shape. |
| ::phase_deg | Return the phase of a complex image in degrees. |
| ::phase_rad | Return the phase of a complex image in radians. |
| ::power_byte | Return the power spectrum of a complex image. |
| ::power_ln | Return the power spectrum of a complex image. |
| ::power_real | Return the power spectrum of a complex image. |