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Reconstruct from odd projections: adapt angles to avoid slice being rotated

Pierre Paleo requested to merge reconstruct_odd_offset into master

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When reconstructing from odd projections, the final slice is slightly rotated with respect to a "full-reconstruction", because the angles are subsampled as well.

In this MR we basically subtract 180/n_projs (or 360/n_projs) to the reconstruction angles, so that the output slices always have the same orientation.

Close #498 (closed)

To do

  • Adapt build_processing_steps
  • End-to-end reconstruction test
Edited by Pierre Paleo

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