convol_fftconvol_fftconvol_fftConvolFftConvolFft (Operator)

Name

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

Signature

Description

convol_fftconvol_fftconvol_fftConvolFftConvolFft convolves two (Fourier-transformed) images in the frequency domain, i.e., the pixels of the complex image ImageFFTImageFFTImageFFTImageFFTimageFFT are multiplied by the corresponding pixels of the filter ImageFilterImageFilterImageFilterImageFilterimageFilter.

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.

Parameters

Example (HDevelop)

gen_highpass(Highpass,0.2,'n','dc_edge',Width,Height)
fft_generic(Image,ImageFFT,'to_freq',-1,'none','dc_edge','complex')
convol_fft(ImageFFT,Highpass,ImageConvol)
fft_generic(ImageConvol,ImageResult,'from_freq',1,'none','dc_edge','byte')

Result

convol_fftconvol_fftconvol_fftConvolFftConvolFft returns 2 (H_MSG_TRUE) if all parameters are correct. 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

fft_imagefft_imagefft_imageFftImageFftImage, fft_genericfft_genericfft_genericFftGenericFftGeneric, rft_genericrft_genericrft_genericRftGenericRftGeneric, gen_highpassgen_highpassgen_highpassGenHighpassGenHighpass, gen_lowpassgen_lowpassgen_lowpassGenLowpassGenLowpass, gen_bandpassgen_bandpassgen_bandpassGenBandpassGenBandpass, gen_bandfiltergen_bandfiltergen_bandfilterGenBandfilterGenBandfilter

Possible Successors

power_bytepower_bytepower_bytePowerBytePowerByte, power_realpower_realpower_realPowerRealPowerReal, power_lnpower_lnpower_lnPowerLnPowerLn, fft_image_invfft_image_invfft_image_invFftImageInvFftImageInv, fft_genericfft_genericfft_genericFftGenericFftGeneric, rft_genericrft_genericrft_genericRftGenericRftGeneric

Alternatives

convol_gaborconvol_gaborconvol_gaborConvolGaborConvolGabor

See also

gen_gaborgen_gaborgen_gaborGenGaborGenGabor, gen_highpassgen_highpassgen_highpassGenHighpassGenHighpass, gen_lowpassgen_lowpassgen_lowpassGenLowpassGenLowpass, gen_bandpassgen_bandpassgen_bandpassGenBandpassGenBandpass, convol_gaborconvol_gaborconvol_gaborConvolGaborConvolGabor, fft_image_invfft_image_invfft_image_invFftImageInvFftImageInv

Module

Foundation