Compute the fast Fourier transform of an image.
fft_image calculates the Fourier transform of the input image (Image), i.e., it transforms the image into the frequency domain. The algorithm used is the fast Fourier transform. This corresponds to the call
fft_generic(Image,ImageFFT,'to_freq',-1,'sqrt','dc_center','complex').
The filtering is always done on the entire image, i.e., the region of the image is ignored.
|
Image (input_object) |
image(-array) -> object : byte / real |
| Input image. | |
|
ImageFFT (output_object) |
image(-array) -> object : complex |
| Fourier-transformed image. | |
fft_image returns 2 (H_MSG_TRUE) if the input image is of correct type. If the input is empty the behavior can be set via set_system(::'no_object_result',<Result>:). If necessary, an exception handling is raised.
fft_image is reentrant and automatically parallelized (on tuple level).
optimize_fft_speed, read_fft_optimization_data
convol_fft, convol_gabor, convert_image_type, power_byte, power_real, power_ln, phase_deg, phase_rad
Foundation
