11. The non-transitory computer-readable storage medium of claim 10 , wherein iteratively extracting the image features from the image involves: partitioning the image into the tiles of different sizes; and extracting the image features from the tiles.
11. The non-transitory computer-readable storage medium of claim 10 , wherein iteratively extracting the image features from the image involves: partitioning the image into the tiles of different sizes; and extracting the image features from the tiles. 12. The non-transitory computer-readable storage medium of claim 11 , wherein for each given tile size in the different sizes, partitioning the image into the tiles involves partitioning the image into tiles of the given tile size.