> Right. So for each pixel, measure the difference against the four
> neighboring pixels, total that up, multiply by the wave propogation
> constant, and that's the total acceleration for this pixel. Seems simple
> enough.
> 
> What happens if the wave propogation medium propogates different
> frequencies at different velocities?

The wave propagation constant is not constant, but a function of 
frequency (dispersion relation).

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