lotusk/tensorflow_camera
https://classroom.udacity.com/courses/ud730/lessons/224c71d3-9dc3-4cb5-abca-f8d12fce5cfa/concepts/b69b7b74-d76e-4749-a7fc-35be6551480f
https://classroom.udacity.com/courses/ud730/lessons/224c71d3-9dc3-4cb5-abca-f8d12fce5cfa/concepts/b69b7b74-d76e-4749-a7fc-35be6551480f