Convolve an image with a filter in the frequency domain.

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

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

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')

convol_fft 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>:). If necessary, an exception handling is raised.

convol_fft is reentrant and automatically parallelized (on tuple level).

fft_image, fft_generic, rft_generic, gen_highpass, gen_lowpass, gen_bandpass, gen_bandfilter

power_byte, power_real, power_ln, fft_image_inv, fft_generic, rft_generic

convol_gabor

gen_gabor, gen_highpass, gen_lowpass, gen_bandpass, convol_gabor, fft_image_inv

Foundation