DIFFUSION TUTORIAL REVISITED
Recently I wrote a tutorial related to PDE based, nonlinear image diffusion, using AOS (Additive Operator Splitting) scheme to solve the related PDE (Partial Differential Equation) efficiently. It seems that that the 'matrix formulation' was not clear to everyone, so I have improved this part. I hope that now it is clearer and easier to understand. Also, I fixed a 'glitch' in the AOS-formulation.