Why is facial expression analysis in the wild challenging?

Tobias Gehrig, Hazim Kemal Ekenel. Why is facial expression analysis in the wild challenging?. In Abhinav Dhall, Roland Goecke, Jyoti Joshi, Michael Wagner 0004, Tom Gedeon, editors, Proceedings of the 2013 on Emotion recognition in the wild challenge and workshop, EmotiW 2013, Sydney, Australia, December 9, 2013. pages 9-16, ACM, 2013. [doi]

Abstract

Abstract is missing.