I think the diffuser ensures that there is a random distribution of incidence angle of photons. Then, if I understand, an optimisation is basically used to fig

I think the diffuser ensures that there is a random distribution of incidence angle of photons. Then, if I understand, an optimisation is basically used to figure out what pixels correspond to what angles. I think the actual angle calculation is skipped and the reconstruction is done directly, but the "angle" concept is implicitly taken into account by the fact that it is needed for the 3D reconstruction to take place.