Sit straight (and tell me what I did today): a human posture alarm and activity summarization system
CARPE '05 Proceedings of the 2nd ACM workshop on Continuous archival and retrieval of personal experiences
Proceedings of the 11th international conference on Intelligent user interfaces
3D reconstruction of human faces from occluding contours
MIRAGE'07 Proceedings of the 3rd international conference on Computer vision/computer graphics collaboration techniques
Articulated-body tracking through anisotropic edge detection
WDV'05/WDV'06/ICCV'05/ECCV'06 Proceedings of the 2005/2006 international conference on Dynamical vision
iAR: an exploratory augmented reality system for mobile devices
Proceedings of the 18th ACM symposium on Virtual reality software and technology
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This paper advocates an implicit-surface representation of generic 3-D surfaces to take advantage of occluding edges in a very robust way. This lets us exploit silhouette constraints in uncontrolled environments that may involve occlusions and changing or cluttered backgrounds, which limit the applicability of most silhouette based methods. This desirable behavior is completely independent from the way the surface deformations are parametrized. To show this, we demonstrate our technique in three very different cases: Modeling the deformations of a piece of paper represented by an ordinary triangulated mesh; tracking a personýs shoulders whose deformations are expressed in terms of Dirichlet Free Form Deformations; reconstructing the shape of a human face parametrized in terms of a Principal Component Analysis model.