convol_gaborconvol_gaborConvolGaborConvolGabor (Operator)

Name

convol_gaborconvol_gaborConvolGaborConvolGabor — Convolve an image with a Gabor filter in the frequency domain.

Signature

convol_gabor(ImageFFT, GaborFilter : ImageResultGabor, ImageResultHilbert : : )

convol_gaborconvol_gaborConvolGaborConvolGaborConvolGabor convolves a Fourier-transformed image with a Gabor filter GaborFilterGaborFilterGaborFilterGaborFiltergaborFilter (see gen_gaborgen_gaborGenGaborGenGaborGenGabor) and its Hilbert transform in the frequency domain. The result image is of type '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

ImageFFTImageFFTImageFFTImageFFTimageFFT (input_object) (multichannel-)image(-array) → object (complex)

Input image.

GaborFilterGaborFilterGaborFilterGaborFiltergaborFilter (input_object) multichannel-image → object (real)

Gabor/Hilbert-Filter.

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

Result of the Gabor filter.

ImageResultHilbertImageResultHilbertImageResultHilbertImageResultHilbertimageResultHilbert (output_object) image(-array) → object (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)