Pre-processing about optic-nerve-cnn HOT 4 CLOSED

@abhinav-iiit, not exactly, the order used is:

1. Area of size 512x512 centered around optic disc is cropped from an original image.
2. Resized to 128x128.
3. Rescaled to [0, 1], CLAHE applied.

Besides, augmentation is applied before CLAHE for both tasks (see preprocess(...)).

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@abhinav-iiit, in the presented version of notebooks, at the preprocessing stage all images are rescaled to [0, 1], resized to 256x256, and CLAHE is applied.

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Thanks!
Let me know if the following is correct for optic cup :

1. Area of size 512x512 centered around optic disc is cropped from original image.
2. Rescaled to [0,1], resized to 256x256, CLAHE applied
3. Again resized to 128x128

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You will probably find the original article helpful, which explains the algorithm in plain English.

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