[IMG176] add rotation axis tilt correction (!146) · Merge requests · Zhang, Chen / iMars3D · GitLab

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Zhang, Chen requested to merge IMG157_rot_axis_tilt_correction into next Jun 09, 2022

Original Gitlab Story: IMG176

This PR adds a new rotation axis tilt correction along with corresponding unit tests.

The tilt correction is calculated by rotating the 180 deg pair util they match
The solution finder is carried out by scalar_minimizer from scipy
The current tilt correction can only work for in-plane tilt within 5 deg.
- within 2 deg: the tilt can be found accurately
- from 2 ~ 5 deg: the accuracy degrades with smaller image size
- beyond 5 deg: it is not recommended to use this correction

The accuracy curve from a 100x100 size image:

blue dots: tilt value calculated from each 180 deg pair
red cross: correct solution (reference value)
black cross: calculated tilt value

benchmark_tilts_searchMethod_100x100.pdf benchmark_tilts_searchMethod_200x200.pdf benchmark_tilts_searchMethod_500x500.pdf