REPORT Nguyen_Idiap-RR-27-2012/IDIAP Using self-context for multimodal detection of head nods in face-to-face interactions Nguyen, Laurent Son Odobez, Jean-Marc Gatica-Perez, Daniel EXTERNAL https://publications.idiap.ch/attachments/reports/2012/Nguyen_Idiap-RR-27-2012.pdf PUBLIC Idiap-RR-27-2012 2012 Idiap August 2012