https://techcrunch.com/2017/08/31/facebook-has-a-way-to-correct-your-crooked-360-photos/

As part of its Scale conference today in San Jose, Facebook’s computational photography team is announcing the completion of an internal research project dedicated to helping you clean up your poorly taken 360 photos. The team used a deep neural network to identify crooked 360 photos and reorient them to maintain realism.

You’ve probably used leveling tools before on your smartphone to salvage pictures taken at awkward angles. But Matt Uyttendaele, one of the research scientists working on the project, explained to me in an interview that traditional computer vision researchers would approach this problem by looking to identify straight lines in a photo converging at a vanishing point (when two parallel lines appear to intersect).