feature_params = {
  'color_model': 'yuv',                # hls, hsv, yuv, ycrcb
  'bounding_box_size': 64,             #
  'number_of_orientations': 11,        # 6 - 12
  'pixels_per_cell': 16,               # 8, 16
  'cells_per_block': 2,                # 1, 2
  'do_transform_sqrt': True
}

sourcer = FeatureSourcer(feature_params, vehicle_image)
f = sourcer.features(vehicle_image)

rgb_img, a_img, b_img, c_img = sourcer.visualize()

# [3 x 3 block positions] x [2 x 2 cells per block] x [11 orientations] x [3 channels] = 1,188 features