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Interactive Tracking of 2D Generic Objects with Spacetime Optimization [chapter]

Xiaolin K. Wei, Jinxiang Chai
2008 Lecture Notes in Computer Science  
We present a continuous optimization framework for interactive tracking of 2D generic objects in a single video stream.  ...  The user begins with specifying the locations of a target object in a small set of keyframes; the system then automatically tracks locations of the objects by combining user constraints with visual measurements  ...  We show the system can accurately track a 2D generic object or or a group of objects with a minimal amount of user interaction.  ... 
doi:10.1007/978-3-540-88682-2_50 fatcat:5gfovt3gqnbxvizvg2hysm6m4m

Coupled Detection and Trajectory Estimation for Multi-Object Tracking

Bastian Leibe, Konrad Schindler, Luc Van Gool
2007 2007 IEEE 11th International Conference on Computer Vision  
We present a novel approach for multi-object tracking which considers object detection and spacetime trajectory estimation as a coupled optimization problem.  ...  The resulting approach can initialize automatically and track a large and varying number of persons over long periods and through complex scenes with clutter, occlusions, and large-scale background changes  ...  Spacetime Trajectory Following The optimization is fed hypothetical tracks based on the object detections in spacetime.  ... 
doi:10.1109/iccv.2007.4408936 dblp:conf/iccv/LeibeSG07 fatcat:havpbydynva3bppmmxlbddnu5q

Dynamic 3D Scene Analysis from a Moving Vehicle

Bastian Leibe, Nico Cornelis, Kurt Cornelis, Luc Van Gool
2007 2007 IEEE Conference on Computer Vision and Pattern Recognition  
Finally, a global optimization criterion takes object-object interactions into account to arrive at accurate 3D localization and trajectory estimates for both cars and pedestrians.  ...  A subsequent tracking module analyzes the resulting 3D observations to find physically plausible spacetime trajectories.  ...  We also wish to acknowledge the support of Toyota Motor Corporation/Toyota Motor Europe, KU Leuven Research Fund's GOA project MARVEL, and TeleAtlas for providing additional survey videos to test on.  ... 
doi:10.1109/cvpr.2007.383146 dblp:conf/cvpr/LeibeCCG07 fatcat:t2xsqfvrsvbwdpvyncxxquc2li

Coupled Object Detection and Tracking from Static Cameras and Moving Vehicles

B. Leibe, K. Schindler, N. Cornelis, L. Van Gool
2008 IEEE Transactions on Pattern Analysis and Machine Intelligence  
We present a novel approach for multi-object tracking which considers object detection and spacetime trajectory estimation as a coupled optimization problem.  ...  The 2D object detections are checked for their consistency with (automatically estimated) scene geometry and are converted to 3D observations which are accumulated in a world coordinate frame.  ...  The authors also acknowledge the support of Toyota Motor Corp./Toyota Motor Europe and KU Leuven Research Fund's GOA project MARVEL.  ... 
doi:10.1109/tpami.2008.170 pmid:18703824 fatcat:37mpe56oxrbafbiljtxycacxti

Keyframe-based tracking for rotoscoping and animation

Aseem Agarwala, Aaron Hertzmann, David H. Salesin, Steven M. Seitz
2004 ACM SIGGRAPH 2004 Papers on - SIGGRAPH '04  
We describe a new approach to rotoscoping -the process of tracking contours in a video sequence -that combines computer vision with user interaction.  ...  Our tracking algorithm is cast as a spacetime optimization problem that solves for time-varying curve shapes based on an input video sequence and user-specified constraints.  ...  Spacetime constraints. In Computer Graphics (Proceedings of SIGGRAPH 88), vol. 22, 159-168.  ... 
doi:10.1145/1186562.1015764 fatcat:himlbl2zu5g4ngts2jf5uaprbq

Keyframe-based tracking for rotoscoping and animation

Aseem Agarwala, Aaron Hertzmann, David H. Salesin, Steven M. Seitz
2004 ACM Transactions on Graphics  
We describe a new approach to rotoscoping -the process of tracking contours in a video sequence -that combines computer vision with user interaction.  ...  Our tracking algorithm is cast as a spacetime optimization problem that solves for time-varying curve shapes based on an input video sequence and user-specified constraints.  ...  We also thank Siobhan Quinn and Lorie Loeb for assisting with early versions of this system, actors Benjamin Stewart and Amira Fahoum, and David Simons and Matt Silverman.  ... 
doi:10.1145/1015706.1015764 fatcat:sg54bmaorfa5blwc2gddsrz2wy

Video-guided motion synthesis using example motions

Min Je Park, Min Gyu Choi, Yoshihisa Shinagawa, Sung Yong Shin
2006 ACM Transactions on Graphics  
We then compute the sequence of body configurations of a virtual character by deforming this motion, according to spacetime constraints derived from a sequence of 2D features in the input video.  ...  We also showed the potential of our scheme as a new paradigm for motion capture, that is, capturing motions from videos taken with a monocular camera, even outside a motion capture studio.  ...  (a), the patch-based 2D feature tracking method works well, in general, under constant • M. J. Park et al.  ... 
doi:10.1145/1183287.1183291 fatcat:jcnbo546zzhifby45bskubm2aa

Human motion reconstruction from inter-frame feature correspondences of a single video stream using a motion library

Min Je Park, Min Gyu Choi, Sung Yong Shin
2002 Proceedings of the 2002 ACM SIGGRAPH/Eurographics symposium on Computer animation - SCA '02  
We exploit a motion library to resolve the depth ambiguity in recovering the 3D configurations from 2D features.  ...  Our reconstruction method takes three major steps: timewarping to align the reference motion with that in the video, reconstructing the joint orientations, and estimating the root trajectory.  ...  This research was supported by the National Research Laboratory (NRL) project of Korea Institute of Science & Technology Evaluation and Planning (KISTEP).  ... 
doi:10.1145/545261.545280 dblp:conf/sca/ParkCS02 fatcat:5e7amkqyhncthhap2ziqkr6l5m

Human motion reconstruction from inter-frame feature correspondences of a single video stream using a motion library

Min Je Park, Min Gyu Choi, Sung Yong Shin
2002 Proceedings of the 2002 ACM SIGGRAPH/Eurographics symposium on Computer animation - SCA '02  
We exploit a motion library to resolve the depth ambiguity in recovering the 3D configurations from 2D features.  ...  Our reconstruction method takes three major steps: timewarping to align the reference motion with that in the video, reconstructing the joint orientations, and estimating the root trajectory.  ...  This research was supported by the National Research Laboratory (NRL) project of Korea Institute of Science & Technology Evaluation and Planning (KISTEP).  ... 
doi:10.1145/545278.545280 fatcat:c4hy2gjj75egdhnsffro4ejble

Active Animations of Reduced Deformable Models with Environment Interactions [article]

Zherong Pan, Dinesh Manocha
2017 arXiv   pre-print
We present an efficient spacetime optimization method to automatically generate animations for a general volumetric, elastically deformable body.  ...  Our approach can model the interactions between the body and the environment and automatically generate active animations.  ...  We compute the animations using a novel spacetime optimization algorithm and formulate the objective function taking into account dynamics constraints as well as various interactions with the environment  ... 
arXiv:1708.08188v2 fatcat:f3pb6wmdbfe2xl537xfwvomkry

Motion editing with spacetime constraints

Michael Gleicher
1997 Proceedings of the 1997 symposium on Interactive 3D graphics - SI3D '97  
However, when considering richer optimization objectives and constraints, we must be careful not to violate the simplifications that make interactive performance possible on spacetime problems.  ...  Methods of Optimization Practical Optimization Computer Graphics (1992 Symposium on Interactive 3D Graphics) A Differential Approach to Graphical Interaction Proceedings of Graphics Interface '93 Advanced  ... 
doi:10.1145/253284.253321 dblp:conf/si3d/Gleicher97 fatcat:lntdttr7jzfrtkvsujf36uma2e

Tracking of moving objects under severe and total occlusions

A. Bartesaghi, G. Sapiro
2005 IEEE International Conference on Image Processing 2005  
A set of interior points provided by the user is used to constrain the optimization, which basically corresponds to selecting the object of interest within the video sequence.  ...  THIS PAGE unclassified Standard Form 298 (Rev. 8-98) ABSTRACT We present an algorithm for tracking moving objects using intrinsic minimal surfaces which handles particularly well the presence of severe  ...  Acknowledgments: This work is partially supported by the Office of Naval Research, the National Science Foundation, and the National Geospatial-Intelligence Agency.  ... 
doi:10.1109/icip.2005.1529747 dblp:conf/icip/BartesaghiS05 fatcat:pclg2gqh6jg2nogszz2xs5zaam

Interactive 3D video editing

Michael Waschbüsch, Stephan Würmlin, Markus Gross
2006 The Visual Computer  
This work is carried out in the context of the blue-c-II project, funded by ETH grant No. 0-21020-04 as an internal poly-project.  ...  Acknowledgement We would like to thank Vanessa Stadler for her Flamenco performance, Rolf Adelsberger, Patrick Jenni, and Doo Young Kwon for helping with the acquisition, and Christoph Niederberger for  ...  3D video with additional 2D and 3D objects, new background and shadow mapping and geometry of the scene as point-samples in spacetime.  ... 
doi:10.1007/s00371-006-0053-z fatcat:bw3wtbvzyzg3vh3uv3grxcxrv4

Dynamic hair capture using spacetime optimization

Zexiang Xu, Hsiang-Tao Wu, Lvdi Wang, Changxi Zheng, Xin Tong, Yue Qi
2014 ACM Transactions on Graphics  
To ensure the spatial and temporal coherence of the dynamic capture, we formulate the global hair reconstruction as a spacetime optimization problem solved iteratively.  ...  Demonstrated using a range of real-world hairstyles driven by different wind conditions and head motions, our approach is able to reconstruct complex hair dynamics matching closely with video recordings  ...  Yue Qi is supported by National Natural Science Foundation of China (No. 61272348  ... 
doi:10.1145/2661229.2661284 fatcat:fhimxik7jvhyrhvg2ps2a5rhai

Applications of Clifford's Geometric Algebra

Eckhard Hitzer, Tohru Nitta, Yasuaki Kuroe
2013 Advances in Applied Clifford Algebras  
We thus hope to clearly demonstrate the benefit of developing problem solutions in a unified framework for algebra and geometry with the widest possible scope: from quantum computing and electromagnetism  ...  We survey the development of Clifford's geometric algebra and some of its engineering applications during the last 15 years.  ...  tracking rotations, but for representing general displacements.  ... 
doi:10.1007/s00006-013-0378-4 fatcat:xmnxscftojhnpgxtyrwrqnjic4
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