Sunkit-image

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Features
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- Add the `~sunkit_image.coalignment` module ported from `sunpy`. (`78 <https://github.com/sunpy/sunkit-image/pull/78>`__)

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Trivial/Internal Changes
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- Minor changes to ensure that sunkit-image is buildable on conda-forge.

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- Fixed a bug where a `~astropy.units.UnitConversionError` was thrown if a non-dimensionless
`~astropy.units.Quantity` object was input for the signal in `~sunkit_image.time_lag.cross_correlation`. (`72 <https://github.com/sunpy/sunkit-image/pull/72>`__)
- Fixed a bug where the way we dealt with `astropy.units.Quantity` objects was inconsistent with
`~dask.array.Array` objects in newer versions of `~numpy`. The ``pre_check_hook`` option keyword
argument has also been removed from `~sunkit_image.time_lag.time_lag` and ``post_check_hook``
has been renamed to ``array_check`` and now accepts two arguments. (`72 <https://github.com/sunpy/sunkit-image/pull/72>`__)


Trivial/Internal Changes
------------------------

- A warning is now raised if the input data to `~sunkit_image.enhance.mgn` contain any NaNs. (`73 <https://github.com/sunpy/sunkit-image/pull/73>`__)

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Features
--------

- The `sunkit_image.time_lag` module provides functions for computing the cross-correlation,
time lag, and peak cross-correlation for N-dimensional time series. (`61 <https://github.com/sunpy/sunkit-image/pull/61>`__)
- Increased the minimum version of "sunpy" to 3.0.0, the new LTS release

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Features
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- The minimum and maximum values of the gamma transform can now be specified for :func:`sunkit_image.enhance.mgn`. (`60 <https://github.com/sunpy/sunkit-image/pull/60>`__)


Bug Fixes
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- Increased the minimum version of "skimage" to 0.18.0, preventing faulty code in :meth:`sunkit_image.utils.points_in_poly`. (`59 <https://github.com/sunpy/sunkit-image/pull/59>`__)


Trivial/Internal Changes
------------------------

- Added multiple unit tests to increase code coverage. (`59 <https://github.com/sunpy/sunkit-image/pull/59>`__)
- Increased minimum supported version of sunpy to 2.0.0
- Many internal package updates to documentation, the continuous integration and etc.

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Features
--------

- Added a class (``sunkit_image.utils.noise.NoiseLevelEstimation``) for noise level estimation of an image. (`12 <https://github.com/sunpy/sunkit-image/pull/12>`__)
- Added a new function (`sunkit_image.radial.fnrgf`) to normalize the radial brightness gradient using a Fourier approximation. (`17 <https://github.com/sunpy/sunkit-image/pull/17>`__)
- Added a function (`sunkit_image.enhance.mgn`) for applying Multi-scale Gaussian Normalization to an image (`numpy.ndarray`). (`30 <https://github.com/sunpy/sunkit-image/pull/30>`__)
- Added a new function (`sunkit_image.trace.occult2`) to automatically trace out loops/curved structures in an image. (`31 <https://github.com/sunpy/sunkit-image/pull/31>`__)
- Added an implementation of the Automated Swirl Detection Algorithm (ASDA). (`40 <https://github.com/sunpy/sunkit-image/pull/40>`__)


Improved Documentation
----------------------

- Added an example on how to use `astroscrappy.detect_cosmics <https://astroscrappy.readthedocs.io/en/latest/api/astroscrappy.detect_cosmics.html>`__ to eliminate cosmic ray hits in solar images. (`#35 <https://github.com/sunpy/sunkit-image/pull/35>`__)


Trivial/Internal Changes
------------------------

- Transferred ``sunkit_image.utils.noise.NoiseLevelEstimation`` from class object into a series of functions. (`38 <https://github.com/sunpy/sunkit-image/pull/38>`__)