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GRASP Special Seminar – Yaser Ajmal Sheikh, Carnegie Mellon University, “Structure from Motion in the Wild: Towards 3D Reconstruction of Active Scenes from Moving Cameras”

September 22, 2011 @ 1:00 pm - 2:00 pm

Abstract: Our social environments abound with activity: faces expressing and emoting, people ambulating and gesticulating, and vehicles locomoting. These same environments are increasingly being imaged by cameras that people carry or wear. In this talk, I will discuss research into reconstructing active environments from cameras that may themselves be moving — a problem that requires the marriage of geometric reconstruction and statistical representation of time-varying data.I will first present an algorithm to reconstruct the motion of a collection of cameras constrained by an underlying articulated structure. The algorithm has been applied for motion capture using multiple body-mounted cameras. Results will be shown in settings where capture would be difficult with traditional motion capture systems, including walking outside and swinging on monkey bars. A central challenge in reconstructing active 3D structure is representation. I will present trajectory-based models of active objects and describe a closed form solution for the estimation of time-varying 3D structure. I will conclude by motivating the use of spatiotemporal models for representing active environments and describe the significant open problems in the area.


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Yaser Ajmal Sheikh is currently an Assistant Research Professor in the Robotics Institute at Carnegie Mellon University. He received his PhD in Computer Science from the University of Central Florida in 2006. Professor Sheikh is interested in analyzing dynamism in scenes from
moving cameras. In particular, his research focuses on dynamic motion
reconstruction, human behavior analysis, estimation of nonrigid motion
and modeling moving cameras in spacetime.


September 22, 2011
1:00 pm - 2:00 pm
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