HALCON Reference Manual 10.0.2

fft_imagefft_imagefft_imageFftImageFftImage (Operator)

Name

fft_imagefft_imagefft_imageFftImageFftImage — Compute the fast Fourier transform of an image.

fft_imagefft_imagefft_imageFftImageFftImage 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 filtering is always done on the entire image, i.e., the region of the image is ignored.

Parallelization

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 internal data level.

Parameters

ImageImageImageImageimage (input_object) image(-array) → object (byte / real)

Input image.

ImageFFTImageFFTImageFFTImageFFTimageFFT (output_object) image(-array) → object (complex)

Fourier-transformed image.

Result

fft_imagefft_imagefft_imageFftImageFftImage 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>)set_system("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_speedoptimize_fft_speedOptimizeFftSpeedOptimizeFftSpeed, read_fft_optimization_dataread_fft_optimization_dataread_fft_optimization_dataReadFftOptimizationDataReadFftOptimizationData

Possible Successors

convol_fftconvol_fftconvol_fftConvolFftConvolFft, convol_gaborconvol_gaborconvol_gaborConvolGaborConvolGabor, convert_image_typeconvert_image_typeconvert_image_typeConvertImageTypeConvertImageType, power_bytepower_bytepower_bytePowerBytePowerByte, power_realpower_realpower_realPowerRealPowerReal, power_lnpower_lnpower_lnPowerLnPowerLn, phase_degphase_degphase_degPhaseDegPhaseDeg, phase_radphase_radphase_radPhaseRadPhaseRad

Alternatives

fft_genericfft_genericfft_genericFftGenericFftGeneric, rft_genericrft_genericrft_genericRftGenericRftGeneric

Module

Foundation

Table of Contents / Filters / FFT

Operators