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dc.contributor.authorLa Casica, Marcoen_US
dc.contributor.authorSclaroff, Stanen_US
dc.date.accessioned2011-10-20T05:07:35Z
dc.date.available2011-10-20T05:07:35Z
dc.date.issued1998-12-04en_US
dc.identifier.citationLa Cascia, Marco; Sclaroff, Stan. "Fast, Reliable Head Tracking under Varying Illumination", Technical Report BUCS-1998-018, Computer Science Department, Boston University, December 4, 1998. [Available from: http://hdl.handle.net/2144/1774]en_US
dc.identifier.urihttp://hdl.handle.net/2144/1774
dc.description.abstractAn improved technique for 3D head tracking under varying illumination conditions is proposed. The head is modeled as a texture mapped cylinder. Tracking is formulated as an image registration problem in the cylinder's texture map image. To solve the registration problem in the presence of lighting variation and head motion, the residual error of registration is modeled as a linear combination of texture warping templates and orthogonal illumination templates. Fast and stable on-line tracking is then achieved via regularized, weighted least squares minimization of the registration error. The regularization term tends to limit potential ambiguities that arise in the warping and illumination templates. It enables stable tracking over extended sequences. Tracking does not require a precise initial fit of the model; the system is initialized automatically using a simple 2-D face detector. The only assumption is that the target is facing the camera in the first frame of the sequence. The warping templates are computed at the first frame of the sequence. Illumination templates are precomputed off-line over a training set of face images collected under varying lighting conditions. Experiments in tracking are reported.en_US
dc.description.sponsorshipOffice of Naval Research (Young Investigator Award N00014-96-1-0661); National Science Foundation (IIS-9624168, EIA-9623865)en_US
dc.language.isoen_USen_US
dc.publisherBoston University Computer Science Departmenten_US
dc.relation.ispartofseriesBUCS Technical Reports;BUCS-TR-1998-018en_US
dc.titleFast, Reliable Head Tracking under Varying Illuminationen_US
dc.typeTechnical Reporten_US


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