46_computer_vision_keras.py

# example of pixel normalization
from numpy import asarray
from PIL import Image

# load image
image = Image.open('bondi_beach.jpg')
pixels = asarray(image)

# confirm pixel range is 0-255
print('Data Type: %s' % pixels.dtype)
print('Min: %.3f, Max: %.3f' % (pixels.min(), pixels.max()))

# convert from integers to floats
pixels = pixels.astype('float32')

# normalize to the range 0-1
pixels /= 255.0

# confirm the normalization
print('Min: %.3f, Max: %.3f' % (pixels.min(), pixels.max()))