I need to know what is iteration and divergence in anisotropic diffusion filter technique.
Isotropic diffusion $$\frac{\partial I(x, y, z)}{\partial t}={\rm div}\left[c\cdot \nabla I\left(x, y, z\right)\right], \quad \text{where } c \text{ is the diffusion coefficient}$$
Anisotropic diffusion $$\frac{\partial I(x, y, z)}{\partial t}={\rm div}\left[g\left(\left\| I\left(x, y, z\right)\right\|\right)\cdot \nabla I\left(x, y, z\right)\right], \quad \text{where } g \text{ is the anisotropic diffusion coefficient }\textbf{(Edge stopping function)}$$
- Here $t$ refers to iteration, what is this iteration ? How is it related to filtering ? I know that iteration refers to number of rounds but how it is related with filtering ?
- Also explain to me why we use divergence in these equation what is the purpose of divergence.