List of augmentations to implement

[nrweir]

The pre-processing component of this package needs to include augmentations. We should use popular existing augmentation implementations for imagery where they exist, for consistency.

The albumentations library (https://github.com/albu/albumentations and https://albumentations.readthedocs.io/en/latest/index.html) compiles the fastest implementations of each operation from OpenCV, imgaug, and scipy, and likely represents the best choice for our use.

Augmentations to include:

(to be added later)

[nrweir]

Another point - I'm not sure if the albumentations package is compatible with != 3-channel images. Something we'll have to dig into.

List of augmentations:

• [ ] horizontal/vertical flips
• [ ] cropping (random and center)
• [ ] rotation
  • [x] arbitrary
  • [ ] 90 degree steps
• [x] zooming in/out
• [ ] blur
• [ ] Gamma
• [ ] transpose
• [ ] optical distortion
• [ ] grid distortion
• [ ] elastic transformation - may want to use albumentations.augmentations.functional.elastic_transform_approx for this for speed
• [ ] HSV
• [ ] channel intensity shifts
• [ ] contrast adjustment
• [ ] brightness adjustment
• [ ] CLAHE
• [ ] gaussian noise (?)
• [ ] channel shuffling (?)
• [ ] image inversion (?) (i.e. new_im = 255 - original_im)
• [ ] convert to grayscale
• [ ] cutout (coarse dropout of square regions from image)

Feel free to extend this list if desired.

[nrweir]

Resolved with #35.