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Your search keyword '"Popović, Jovan"' showing total 32 results
Start Over Author "Popović, Jovan" Journal acm transactions on graphics
32 results on '"Popović, Jovan"'

31. Temporally Coherent Completion of Dynamic Shapes.

Author

HAO LI, LUO, LINJIE, VLASIC, DANIEL, PEERS, PIETER, POPOVIĆ, JOVAN, PAULY, MARK, and RUSINKIEWICZ, SZYMON

Subjects
GEOMETRIC shapes, GEOMETRIC surfaces, ALBEDO, DYNAMICS, TOPOLOGY, DEFORMATION of surfaces, GEOMETRIC analysis
Abstract

We present a novel shape completion technique for creating temporally coherent watertight surfaces from real-time captured dynamic performances. Because of occlusions and low surface albedo, scanned mesh sequences typically exhibit large holes that persist over extended periods of time. Most conventional dynamic shape reconstruction techniques rely on template models or assume slow deformations in the input data. Our framework sidesteps these requirements and directly initializes shape completion with topology derived from the visual hull. To seal the holes with patches that are consistent with the subject's motion, we first minimize surface bending energies in each frame to ensure smooth transitions across hole boundaries. Temporally coherent dynamics of surface patches are obtained by unwarping all frames within a time window using accurate interframe correspondences. Aggregated surface samples are then filtered with a temporal visibility kernel that maximizes the use of nonoccluded surfaces. A key benefit of our shape completion strategy is that it does not rely on long-range correspondences or a template model. Consequently, our method does not suffer error accumulation typically introduced by noise, large deformations, and drastic topological changes. We illustrate the effectiveness of our method on several high-resolution scans of human performances captured with a state-of-the-art multiview 3D acquisition system. [ABSTRACT FROM AUTHOR]

Published
2012
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32. Linear Bellman Combination for Control of Character Animation.

Author

Silvax, Marco da, Durand, Frédo, and Popović, Jovan

Subjects
COMPUTER-generated imagery, COMPUTER graphics, PARTIAL differential equations, EQUATIONS, MATHEMATICAL variables, INTERPOLATION
Abstract

Controllers are necessary for physically-based synthesis of character animation. However, creating controllers requires either manual tuning or expensive computer optimization. We introduce linear Bellman combination as a method for reusing existing controllers. Given a set of controllers for related tasks, this combination creates a controller that performs a new task. It naturally weights the contribution of each component controller by its relevance to the current state and goal of the system. We demonstrate that linear Bellman combination outperforms naive combination often succeeding where naive combination fails. Furthermore, this combination is provably optimal for a new task if the component controllers are also optimal for related tasks. We demonstrate the applicability of linear Bellman combination to interactive character control of stepping motions and acrobatic maneuvers. [ABSTRACT FROM AUTHOR]

Published
2009
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