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DiffusionFilter
# Diffusion filter ## Diffusion equation From Wikipedia, > The diffusion equation is a partial differential equation which describes density dynamics in a material undergoing diffusion. $$ \frac{\partial\phi(\mathbf{r},t)}{\partial t} = \nabla \cdot \big[ D(\phi,\mathbf{r}) \ \nabla\phi(\mathbf{r},t) \big], $$