Anatomical priors

[AnderBiguri]

Anatomical priors in TIGRE.

This is work in progress, making a PR for visibility.

Tasks before merge

• PICCS
  • Multi-GPU source
  • Add PICCS algorithm to python
• Directional TV (CUDA). Gradient-based like standard TV minimizer? or proximal based like ROF? both?
  • Test the regularized within a minimization algorithm. ASD-POCS.
• Matthias Ehrhardt's Directional TV. The other one I was thinking about was a TV that is an ellipsoid shape, that changes its angle w.r.t. an anatomical prior image. Ehrhardt's directional TV changes in value w.r.t. an underlying anatomical prior (I think).
• Add educational demos. This is called anatomical priors but of course also works for industrial tomography.

[AnderBiguri]

https://github.com/mehrhardt/Multi-Modality-Imaging-with-Structure-Promoting-Regularizers/blob/master/example_xray.py