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Ding Yuan

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01 Feb 2011 Image Edge Enhancing Coherence Filter Toolbox Advanced 2D/3D noise removal and edge enhancing with anisotropic diffusion filtering ( Weickert ) Author: Dirk-Jan Kroon

Dirk,

Thanks for sharing, your profession in matlab is very impressive. the package is really nonlinear anisotropic diffusion, not only coherence diffusion, so I strongly suggest changing the name. I found a problem in functions2D/EigenVectors2D.m the eigenvectors v1 v2 corresponds to mu2 and mu1, please check it, it can be a serious bug.

28 Jan 2011 Nonlinear Diffusion Toolbox Set of functions to perform nonlinear diffusion on images. Author: Frederico D'Almeida

Hi Frederico,

I am translating your matlab code in to IDL, I find that in the convolution step ('gsderiv.m'), the gaussian kernel is not normalized. It is done in 1D 'kernel=kernel/sum(kernel)', however, it is important that you do it like this:
kernel_grid=meshgrid(kernel_index,kernel_index)
kernel = exp(-.5*(kernel_grid./sigma).^2)
kernel=kernel/sum(kernel)

then you do convolution

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