[GitHub] [incubator-mxnet] lkubin opened a new pull request #16794: Random rotation

[GitBox <gi...@apache.org>]

lkubin opened a new pull request #16794: Random rotation
URL: https://github.com/apache/incubator-mxnet/pull/16794
 
 
   ## Description ##
   - We implemented functions for image rotation and random rotation in mxnet.image.image.py, a transform for Rotation and one for RandomRotation in mxnet.gluon.data.vision.transforms.py
   
   ## Checklist ##
   ### Essentials ###
   
   - [x] The PR refers to the relevant issues #13206 #11230
   - [x] Changes are complete 
   - [x] All changes have test coverage
   - Unit tests are added for both mxnet.image.image.py functions and for mxnet.gluon.data.vision.transforms.py 
   - [x] Code is well-documented: 
   - For user-facing API changes, API doc string has been updated. 
   - [x] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   - [x] Image rotation function `imrotate`, based on BilinearSampler function. Tested in tests/python/unittest/test_image.py
   - [x] transforms.Rotate, tested in tests/python/unittest/test_gluon_data_vision.py
   - [x] Image random rotation function `random_rotate`. Tested in tests/python/unittest/test_image.py
   - [x] transforms.RandomRotation, tested in tests/python/unittest/test_gluon_data_vision.py
   
   ## Comments ##
   All the implemented functionalities are based on `imrotate` function. The shape of the output of this function is the same shape of the input, thus it can be used inside a transformer.
   It supports 3 behaviors:
   - Simple image rotation without zooming
   ![alt text](https://i.ibb.co/1m4P6wr/no-zoom.png "Simple Rotation")
   - Zoom in image rotation: no padding is shown in the output result
   ![alt text](https://i.ibb.co/JyCK6GQ/zoom-in.png "Rotation with zoom in")
   - Zoom out image rotation: the whole original image will be contained in the output result
   ![alt text](https://i.ibb.co/tPhLKvT/zoom-out.png "Rotation with zoom in")
   
   

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