convol_gaborconvol_gaborConvolGaborConvolGaborconvol_gabor (Operator)
Name
convol_gaborconvol_gaborConvolGaborConvolGaborconvol_gabor — Convolve an image with a Gabor filter in the frequency domain.
Signature
Description
convol_gaborconvol_gaborConvolGaborConvolGaborConvolGaborconvol_gabor convolves a Fourier-transformed image with a
Gabor filter GaborFilterGaborFilterGaborFilterGaborFiltergaborFiltergabor_filter (see gen_gaborgen_gaborGenGaborGenGaborGenGaborgen_gabor) and its
Hilbert transform in the frequency domain. The result image is of
type 'complex'"complex""complex""complex""complex""complex".
Attention
The filtering is always done on 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.
Parameters
ImageFFTImageFFTImageFFTImageFFTimageFFTimage_fft (input_object) (multichannel-)image(-array) → objectHImageHObjectHImageHobject (complex)
Input image.
GaborFilterGaborFilterGaborFilterGaborFiltergaborFiltergabor_filter (input_object) multichannel-image → objectHImageHObjectHImageHobject (real)
Gabor/Hilbert-Filter.
ImageResultGaborImageResultGaborImageResultGaborImageResultGaborimageResultGaborimage_result_gabor (output_object) image(-array) → objectHImageHObjectHImageHobject * (complex)
Result of the Gabor filter.
ImageResultHilbertImageResultHilbertImageResultHilbertImageResultHilbertimageResultHilbertimage_result_hilbert (output_object) image(-array) → objectHImageHObjectHImageHobject * (complex)
Result of the Hilbert filter.
Example (HDevelop)
gen_gabor(Filter,1.4,0.4,1.0,1.5,'n','dc_edge',512,512)
fft_generic(Image,ImageFFT,'to_freq',-1,'none','dc_edge','complex')
convol_gabor(ImageFFT,Filter,Gabor,Hilbert)
fft_generic(Gabor,GaborInv,'from_freq',1,'none','dc_edge','byte')
fft_generic(Hilbert,HilbertInv,'from_freq',1,'none','dc_edge','byte')
energy_gabor(GaborInv,HilbertInv,Energy)
Result
convol_gaborconvol_gaborConvolGaborConvolGaborConvolGaborconvol_gabor returns TRUE if all images are 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>)set_system("no_object_result",<Result>). If necessary,
an exception is raised.
Possible Predecessors
fft_imagefft_imageFftImageFftImageFftImagefft_image,
fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic,
gen_gaborgen_gaborGenGaborGenGaborGenGaborgen_gabor
Possible Successors
power_bytepower_bytePowerBytePowerBytePowerBytepower_byte,
power_realpower_realPowerRealPowerRealPowerRealpower_real,
power_lnpower_lnPowerLnPowerLnPowerLnpower_ln,
fft_image_invfft_image_invFftImageInvFftImageInvFftImageInvfft_image_inv,
fft_genericfft_genericFftGenericFftGenericFftGenericfft_generic
Alternatives
convol_fftconvol_fftConvolFftConvolFftConvolFftconvol_fft
See also
convol_imageconvol_imageConvolImageConvolImageConvolImageconvol_image
Module
Foundation