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# Integer to float conversion - Converts 256 gray levels into floating point equivalents.
# Geometric normalization – Lines up human chosen eye coordinates.
# Masking – Crops the image using an elliptical mask and image borders such that only the face from forehead to chin and cheek to cheek is visible.
# Histogram equalization – Equalizes the histogram of the unmasked part of the image.
# Pixel normalization – scales the pixel values to have a mean of zero and a standard deviation of one.
