CHANGELOG

0.4.1
 - setup: bump scipy to 1.4.0 (updated QHull in griddata)
0.4.0
 - BREAKING CHANGES:
   - renamed submodule `_preproc` to `_prepare_sino`
   - renamed submodule `_postproc` to `_translate_ri`
   - missing apple core correction is now applied to the
     object function (`f`) instead of the refractive index (`n`),
     which is the physically correct approach
   - default keyword for `padval` is now "edge"
     instead of `None`; the meaning is retained
 - enh: added symmetric histogram apple core correction method "sh"
 - fix: using "float32" dtype in 3D backpropagation lead to
   casting error in numexpr
 - enh: improve performance when padding is disabled
 - docs: minor update
0.3.0
 - feat: basic missing apple core correction (#6)
 - docs: reordered 3D examples (decreasing importance)
0.2.6
 - fix: make phase unwrapping deterministic
 - tests: remove one test of the 2D Fourier mapping algorithm due to
   instabilities in using scipy.interpolate.griddata
 - ref: use `empty_aligned` instead of deprecated `n_byte_align_empty`
 - docs: add hint for windows users how to run the 3D examples
0.2.5
 - fix: reconstruction volume rotated by 180° due to floating point
   inaccuracies (affects `backpropagate_3d_tilted`).
0.2.4
 - maintenance release
0.2.3
 - enh: employ slice-wise padding to reduce the memory usage (and
   possibly the computation time) of
   - basic 3D backpropagation algorithm (#7)
   - 3D backpropagation with a tilted axis of rotation (#9)
 - ref: replace asserts with raises (#8)
 - ref: multiprocessing-based rotation does not anymore require
   a variable (_shared_array) at the top level of the module; As a
   result, multiprocessing-rotation should now also work on Windows.
0.2.2
 - docs: minor update and add changelog
0.2.1
 - fix: Allow sinogram data type other than complex128
 - docs: Add example with experimental data (#3)
 - ci: automated deployment with travis-ci
0.2.0
 - BREAKING CHANGES:
   - Dropped support for Python 2
   - Renamed `sum_2d` to `integrate_2d`
 - Refactoring (#4, #5):
   - Moved each reconstruction algorithm to a separate file
   - Modified code to comply with PEP8
   - Moved long doc strings from source to docs directory
   - Migrate from unwrap to scikit-image
   - Cleaned up example scripts
 - Bugfixes:
   - Mistake in "negative-modulo" method for determination of
     2PI sinogram phase offsets
0.1.8
 - Updated documentation
 - Cleaned up examples
0.1.7
 - Move documentation from GitHub to readthedocs.io
 - Add universal wheel on PyPI
 - Update tests on travis with new versions of NumPy
0.1.6
 - Bugfixes:
  - size of reconstruction volume in z too large for cases where
    the y-size is larger than the x-size of the sinogram images
  - `backpropagate_3d_tilted` used wrong shape of projections
  - 3D backpropagation methods did not use power-of-two padding size
0.1.5
 - Code optimization (speed, memory) with numexpr
 - New keyword argument `save_memory` for 3D reconstruction
   on machines with limited memory
 - New keyword argument `copy` for 3D reconstruction to protect
   input sinogram data.
0.1.4
 - The exponential term containing the distance between center
   of rotation and detector `lD` is now multiplied with
   the factor `M-1` instead of `M`. This is necessary,
   because usually the scattered wave is normalized in both
   amplitude and phase (`u_0`) and not only amplitude `a_0`
 - Allow angles of shape (A,1) in `backpropagate_3d_tilted` 
 - Set default value lD=0 for all reconstruction algorithms
 - Improvement of documentation
0.1.3
 - Fixes for `backpropagate_3d_tilted` when `angles` are
   points on the unit sphere:
   - Make sure each point is normalized
   - Correctly rotate each point w.r.t. `tilted_axis`
0.1.2
 - Added reconstruction algorithm for tilted axis of rotation
0.1.1
 - Support NumPy 1.10.
 - Allow to weight backpropagation using keyword `weight_angles`
 - Bugfix: backpropagate_3d with keyword `onlyreal=True` did not work
 - Bugfix: sum_2d did not return correctly shaped array
 - Code coverage is now 90%
 - Added more examples to the documentation