'0) Atari frames: 210 x 160
1) Get image grayscale
2) Rescale image 110 x 84
3) Crop center 84 x 84 (you can crop top/bottom according to the game)'

def get_preprocessed_frame(self, observation):

    return resize(rgb2gray(observation), (110, 84))[13:(110 - 13), :]
