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Signal processing

Files
file	bruite.c
	adds noise to an image
file	convol.c
	convolution
file	directionalfilter.c
	directional filter for curvilinear feature extraction
file	diZenzo.c
	diZenzo gradient pour les images couleurs
file	fft.c
	fast Fourier transform
file	gaussianfilter.c
	Gaussian filter operator.
file	gradientcd.c
	Canny-Deriche gradient operator.
file	laplacian.c
	Laplacian operator.

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