Ambiguities in Visual Tracking of Articulated Objects Using Two and Three-Dimensional Models  

Oleh:

Rehg, James M. ; Morris, Daniel D. ; Kanade, Takeo

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: The International Journal of Robotics Research vol. 22 no. 6 (Jun. 2003), page 393-418.
Topik: figure tracking; visual servoing; kinematic singularities; motion capture
Fulltext: 393.pdf (571.02KB)

Isi artikel

Three-dimensional (3D) kinematic models are widely-used in videobased figure tracking. We show that these models can suffer from singularities when motion is directed along the viewing axis of a single camera. The single camera case is important because it arises in many interesting applications, such as motion capture from movie footage, video surveillance, and vision-based user-interfaces. We describe a novel two-dimensional scaled prismatic model (SPM) for figure registration. In contrast to 3D kinematic models, the SPM has fewer singularity problems and does not require detailed knowledge of the 3D kinematics. We fully characterize the singularities in the SPM and demonstrate tracking through singularities using synthetic and real examples. We demonstrate the application of our model to motion capture from movies. Fred Astaire is tracked in a clip from the film "Shall We Dance".We also present the use of monocular hand tracking in a 3D user-interface. These results demonstrate the benefits of the SPM in tracking with a single source of video.

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