I used SNAP to perform GLCM processing on SAR images. And I want to normalize these images for neural network training. I used Python to find the maximum and minimum values of these images, but these values are somewhat different from my estimation(From the perspective of probability, should the maximum and minimum be between 0 and 1?).
So how should I obtain the formula used by SNAP in the process of GLCM calculation, or the theoretical maximum and minimum values?