Improved robustness to case of constant intensity frame.
Masking of displacements with poor correlations in frame align.
Partial.
3D HMM calls frame_alignment with correlation criterion
Fix to correlation thresholding in frame alignment
Ignore masked frames in whole frame shifting
Fixes to 3D HMM and removal of itertool.chain(*
Bug fix.
Bug fix
Bug fix in frame alignment of 3D row-wise displacements
Changes to estimation of transition probabilities.
Cleanup and fixes to tests.
Stopped motion correction parameters from being changed during
estimation.
Removed unnecessary import.
Merge pull request #68 from pkaifosh/motion

Improvements of 3D motion correction