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Feature Engineering:

For each pixel, consider 5*5 patch neighbors, calculate one-order and two-order derivatives within patch, calculate one-order and two-order derivatives within 4 neighbor patches, two color channel values, calculate Y channel values and dynamic range.
Total number of features: 55 + 5 + 2 + 2 + 45 = 54
Total number of instances: 5[no. of images] * 2000*4000[resolution] = 40M