A realtime shrug detector

Ning Huazhong, Tony X. Han, Hu Yuxiao, Zhang Zhenqiu, Fu Yun, Thomas S. Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A realtime system for shrug detection is discussed in this paper. The system is automatically initialized by a face detector based on Ada-boost[14], After frontal face is localized by the face detector, shoulder position is detected by fitting a parabola to the nearby horizontal edges using weighted Hough Transform[13]. Since shrug is an action which is defined not only by the distance between face and shoulder but also the relative temporal-spacial changing between them, we propose a parameterizing scheme using two different parabolas, named as "Stable Parabola" (SP) and "Transient Parabola" (TP) to characterize the action shrug. Stable Parabola represents the mean shoulder position over a long time duration, while Transient Parabola represents the mean shoulder position of a very short time duration. By using this scheme (only 6 dimensions), we avoid the high dimensional representation of the temporal process - shrug, and therefore make the realtime implementation possible. The shrug detector is then trained in the parameter space using Fisher Discriminant Analysis (FDA). The experiments show that the proposed shrug detector is able to not only detect the shrug action correctly and efficiently (in realtime), but also tolerate the large in-class variation caused by different subject, different action speed, illumination, partial occlusion, and background clutter. So the proposed realtime shrug detector is promising in video analysis under an uncontrolled environment.

Original languageEnglish (US)
Title of host publicationFGR 2006
Subtitle of host publicationProceedings of the 7th International Conference on Automatic Face and Gesture Recognition
Pages505-510
Number of pages6
DOIs
StatePublished - Nov 14 2006
EventFGR 2006: 7th International Conference on Automatic Face and Gesture Recognition - Southampton, United Kingdom
Duration: Apr 10 2006Apr 12 2006

Publication series

NameFGR 2006: Proceedings of the 7th International Conference on Automatic Face and Gesture Recognition
Volume2006

Other

OtherFGR 2006: 7th International Conference on Automatic Face and Gesture Recognition
Country/TerritoryUnited Kingdom
CitySouthampton
Period4/10/064/12/06

ASJC Scopus subject areas

  • Engineering(all)

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