Operator Reference

HALCON Operator Reference / Filters / FFT
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fft_image_invfft_image_invFftImageInvFftImageInvfft_image_inv (Operator)

fft_image_invfft_image_invFftImageInvFftImageInvfft_image_inv — Compute the inverse fast Fourier transform of an image.

Signature

fft_image_inv(Image : ImageFFTInv : : )

Herror fft_image_inv(const Hobject Image, Hobject* ImageFFTInv)

Herror T_fft_image_inv(const Hobject Image, Hobject* ImageFFTInv)

void FftImageInv(const HObject& Image, HObject* ImageFFTInv)

HImage HImage::FftImageInv() const

static void HOperatorSet.FftImageInv(HObject image, out HObject imageFFTInv)

HImage HImage.FftImageInv()

def fft_image_inv(image: HObject) -> HObject

Description

fft_image_invfft_image_invFftImageInvFftImageInvfft_image_inv calculates the inverse Fourier transform of the input image (ImageImageImageimageimage), i.e., it transforms the image back into the spatial domain. This corresponds to the call fft_generic(Image, ImageFFT, 'from_freq', 1, 'sqrt', 'dc_center', 'byte')fft_generic(Image, ImageFFT, "from_freq", 1, "sqrt", "dc_center", "byte")FftGeneric(Image, ImageFFT, "from_freq", 1, "sqrt", "dc_center", "byte")FftGeneric(Image, ImageFFT, "from_freq", 1, "sqrt", "dc_center", "byte")fft_generic(Image, ImageFFT, "from_freq", 1, "sqrt", "dc_center", "byte").

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) → objectHImageHObjectHObjectHobject (complex)

Input image.

ImageFFTInvImageFFTInvImageFFTInvimageFFTInvimage_fftinv (output_object)  image(-array) → objectHImageHObjectHObjectHobject * (byte)

Inverse-Fourier-transformed image.

Result

fft_image_invfft_image_invFftImageInvFftImageInvfft_image_inv 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>)set_system("no_object_result",<Result>). If necessary, an exception is raised.

Possible Predecessors

convol_fftconvol_fftConvolFftConvolFftconvol_fft, convol_gaborconvol_gaborConvolGaborConvolGaborconvol_gabor, fft_imagefft_imageFftImageFftImagefft_image, optimize_fft_speedoptimize_fft_speedOptimizeFftSpeedOptimizeFftSpeedoptimize_fft_speed, read_fft_optimization_dataread_fft_optimization_dataReadFftOptimizationDataReadFftOptimizationDataread_fft_optimization_data

Possible Successors

convert_image_typeconvert_image_typeConvertImageTypeConvertImageTypeconvert_image_type, energy_gaborenergy_gaborEnergyGaborEnergyGaborenergy_gabor

Alternatives

fft_genericfft_genericFftGenericFftGenericfft_generic, rft_genericrft_genericRftGenericRftGenericrft_generic

See also

fft_imagefft_imageFftImageFftImagefft_image, fft_genericfft_genericFftGenericFftGenericfft_generic, energy_gaborenergy_gaborEnergyGaborEnergyGaborenergy_gabor

Module

Foundation

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