fft_imagefft_imageFftImageFftImage (Operator)
Name
fft_imagefft_imageFftImageFftImage — Compute the fast Fourier transform of an image.
Signature
Description
fft_imagefft_imageFftImageFftImageFftImage calculates the Fourier transform of the input
image (ImageImageImageImageimage), 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')
.
Attention
The transformation is always performed for the entire image, i.e., the
domain of the image is ignored.
Execution Information
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Automatically parallelized on tuple level.
- Automatically parallelized on channel level.
- Automatically parallelized on internal data level.
Parameters
ImageImageImageImageimage (input_object) (multichannel-)image(-array) → objectHImageHImageHobject (byte / real)
Input image.
ImageFFTImageFFTImageFFTImageFFTimageFFT (output_object) image(-array) → objectHImageHImageHobject * (complex)
Fourier-transformed image.
Result
fft_imagefft_imageFftImageFftImageFftImage 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>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>). If necessary,
an exception is raised.
Possible Predecessors
optimize_fft_speedoptimize_fft_speedOptimizeFftSpeedOptimizeFftSpeedOptimizeFftSpeed,
read_fft_optimization_dataread_fft_optimization_dataReadFftOptimizationDataReadFftOptimizationDataReadFftOptimizationData
Possible Successors
convol_fftconvol_fftConvolFftConvolFftConvolFft,
convol_gaborconvol_gaborConvolGaborConvolGaborConvolGabor,
convert_image_typeconvert_image_typeConvertImageTypeConvertImageTypeConvertImageType,
power_bytepower_bytePowerBytePowerBytePowerByte,
power_realpower_realPowerRealPowerRealPowerReal,
power_lnpower_lnPowerLnPowerLnPowerLn,
phase_degphase_degPhaseDegPhaseDegPhaseDeg,
phase_radphase_radPhaseRadPhaseRadPhaseRad
Alternatives
fft_genericfft_genericFftGenericFftGenericFftGeneric,
rft_genericrft_genericRftGenericRftGenericRftGeneric
See also
fft_image_invfft_image_invFftImageInvFftImageInvFftImageInv
Module
Foundation