https://www.tensorflow.org/hub/modules/google/delf/1
https://github.com/tensorflow/hub/blob/master/examples/colab/tf_hub_delf_module.ipynb
https://arxiv.org/abs/1604.01325
https://cvlab.epfl.ch/research/page-90554-en-html/research-detect-lift/
https://en.wikipedia.org/wiki/Correspondence_problem
https://en.wikipedia.org/wiki/Bundle_adjustment
https://en.wikipedia.org/wiki/Simultaneous_localization_and_mapping
https://en.wikipedia.org/wiki/Oriented_FAST_and_rotated_BRIEF https://stackoverflow.com/questions/35877193/detecting-similar-points-between-two-pictures-and-then-overlaying-them-python https://en.wikipedia.org/wiki/Scale-invariant_feature_transform
https://cdn57.androidauthority.net/wp-content/uploads/2018/05/vps-camera-Google-IO-2018-840x472.jpg