Retina broken log polar WIP

[breznak]

WIP PR, I made some cleanups,improvements to the PR, but broke scaling/logpolar.

What I'd like to do is use Retina's useLogSampling, but imho that unfortunately

• does not do logpolar transformation (only log scaling?)
• does not allow to set center&diameter of fovea

Our current approach is neither ideal,

• we have to crop to ROI

• I'd like to re-center the image to given center (& fov. diameter)

  • then apply log polar to all of the image
  • then apply log-scale reduction as is in Retina (so parts further from fovea become blurred, encoded with lesser precision)

• What is the difference for self.scale and self.scale_fovea ?

  • is scaling working properly, incl plots?

Follow up to #691