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On the Two-View Geometry of Unsynchronized Cameras [article]

Cenek Albl, Zuzana Kukelova, Andrew Fitzgibbon, Jan Heller, Matej Smid, Tomas Pajdla
2017 arXiv   pre-print
We evaluated the methods on synthetic and wide range of real world datasets and the results show a broad applicability to the problem of camera synchronization.  ...  We present new methods for simultaneously estimating camera geometry and time shift from video sequences from multiple unsynchronized cameras.  ...  First, we present a new method for simultaneous computation of two-view camera geometry and temporal offset parameters from minimal sets of point correspondences.  ... 
arXiv:1704.06843v1 fatcat:4rqlsynex5dhpntem55qqiqjaa

On the Two-View Geometry of Unsynchronized Cameras

Cenek Albl, Zuzana Kukelova, Andrew Fitzgibbon, Jan Heller, Matej Smid, Tomas Pajdla
2017 2017 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
We evaluated the methods on synthetic and wide range of real world datasets and the results show a broad applicability to the problem of camera synchronization.  ...  We present new methods for simultaneously estimating camera geometry and time shift from video sequences from multiple unsynchronized cameras.  ...  First, we present a new method for simultaneous computation of two-view camera geometry and temporal offset parameters from minimal sets of point correspondences.  ... 
doi:10.1109/cvpr.2017.593 dblp:conf/cvpr/AlblKFHSP17 fatcat:i4vrsr4q65ae7plsrbl62tozgy

Computing Epipolar Geometry from Unsynchronized Cameras

Y. PIAO, J. SATO
2008 IEICE transactions on information and systems  
If 3D points are observed from synchronized cameras, the multiple view geometry of these cameras can be computed and the 3D reconstruction of the scene is available.  ...  The proposed method is tested by using real image sequences taken from uncalibrated and unsynchronized cameras. key words: epipolar geometry, unsynchronized cameras, uncalibrated cameras, temporal offset  ...  Both the temporal offset and the frame rate ratio of two cameras were computed properly by using the proposed method. We first described the epipolar geometry on unsynchronized video cameras.  ... 
doi:10.1093/ietisy/e91-d.8.2171 fatcat:4je6c4pnh5hehimb6aelkyowx4

Correcting unsynchronized zoom in 3D video

Colin Doutre, Mahsa T. Pourazad, Alexis Tourapis, Panos Nasiopoulos, Rabab K. Ward
2010 Proceedings of 2010 IEEE International Symposium on Circuits and Systems  
Next, we present a method for correcting zoom mismatch by applying cropping and scaling to ones of the views.  ...  In this paper we study the problem of unsynchronized zooming in 3D video.  ...  IMPACT OF ZOOM MISMATCH ON SUBJECTIVE 3D QUALITY Consider the stereo geometry of two parallel cameras shown in Figure 1 .  ... 
doi:10.1109/iscas.2010.5537923 dblp:conf/iscas/DoutrePTNW10 fatcat:svuhmu2cbrf3dnb56ecf24krbe

Synchronization and calibration of camera networks from silhouettes

S.N. Sinha, M. Pollefeys
2004 Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004.  
In this paper, we extend recent work on computing the epipolar geometry from dynamic silhouettes, to deal with unsynchronized sequences and find the temporal offset between them.  ...  We propose an automatic approach to synchronize a network of uncalibrated and unsynchronized video cameras, and recover the complete calibration of all these cameras.  ...  The rays through the center of a calibrated camera and points on the silhouette define a viewing cone [6] .  ... 
doi:10.1109/icpr.2004.1334021 dblp:conf/icpr/SinhaP04 fatcat:bv6nmbxyjvgb3phtnc2agtjbhm

Stereoscopic 3D View Synthesis From Unsynchronized Multi-View Video

Felix Klose, Christian Linz, Christian Lipski, Marcus Magnor, Kai Ruhl
2011 Zenodo  
Publication in the conference proceedings of EUSIPCO, Barcelona, Spain, 2011  ...  Their focus is on synthesizing new views close to the original camera path, rather than a wide set of novel views. Zhou et al.  ...  A novel view I(ϕ,t) is a function of those two parameters.  ... 
doi:10.5281/zenodo.42480 fatcat:lzhzkd6zxrcx3ik5vht43uzhdm

Motion-based pose estimation via free falling

Changjun Gu, Gan Sun, Yun Feng, Dongying Tian, Yan Peng, Xiaomao Li, Yang Cong
2018 2018 33rd Youth Academic Annual Conference of Chinese Association of Automation (YAC)  
Specifically, it first estimates the feature points based on synchronization or asynchronous free fall motion.  ...  After adding an uncalibrated node into a network of calibrated cameras, our method can fully automatic calibrate multiple cameras using several free fall motion.  ...  Let us assume that the two cameras in fixed poses can share a common field of view. Then the generated 3D points can be viewed by cameras C 1 , C 2 .  ... 
doi:10.1109/yac.2018.8406457 fatcat:ivdm4254lvghjm25zrl4comdsi

Virtual Video Camera: Image-Based Viewpoint Navigation Through Space and Time

C. Lipski, C. Linz, K. Berger, A. Sellent, M. Magnor
2010 Computer graphics forum (Print)  
Instead of scene depth estimation, layer segmentation, or 3D reconstruction, our approach is based on dense image correspondences, treating view interpolation uniformly in space and time: spatial viewpoint  ...  Acquisition simplification, integration of moving cameras, generalization to difficult scenes, and space-time symmetric interpolation amount to a widely applicable Virtual Video Camera system.  ...  In their Video View Interpolation system, Zitnick [WY05, WSY07] . The system operates on unsynchronized video streams and is capable of interpolating in space and time.  ... 
doi:10.1111/j.1467-8659.2010.01824.x fatcat:7letli33zrb6vcahwarykgyhye

Virtual video camera

Christian Lipski, Christian Linz, Kai Berger, Marcus Magnor
2009 SIGGRAPH '09: Posters on - SIGGRAPH '09  
Instead of scene depth estimation, layer segmentation, or 3D reconstruction, our approach is based on dense image correspondences, treating view interpolation uniformly in space and time: spatial viewpoint  ...  Acquisition simplification, integration of moving cameras, generalization to difficult scenes, and space-time symmetric interpolation amount to a widely applicable Virtual Video Camera system.  ...  In their Video View Interpolation system, Zitnick [WY05, WSY07] . The system operates on unsynchronized video streams and is capable of interpolating in space and time.  ... 
doi:10.1145/1599301.1599394 dblp:conf/siggraph/LipskiLBM09 fatcat:h4qfqov6yvharnjcxvvvu74epu

Discrete Laplace Operator Estimation for Dynamic 3D Reconstruction [article]

Xiangyu Xu, Enrique Dunn
2019 arXiv   pre-print
Our graph-theoretic formulation models the Spatio-temporal relationships among our observations in terms of the joint estimation of their 3D geometry and its discrete Laplace operator.  ...  We present a reconstructability analysis, experiments on motion capture data and multi-view image datasets, as well as explore applications to geometry-based event segmentation and data association.  ...  The value of λ 2 depends on the 2D noise level and the mean camera-to-scene distance. Enforcing Multi-view Reconstructability.  ... 
arXiv:1908.11044v1 fatcat:4boappn6pjbxflnf5ggvrb6gem

GTT-Net: Learned Generalized Trajectory Triangulation [article]

Xiangyu Xu, Enrique Dunn
2021 arXiv   pre-print
We build on a graph-theoretic formulation of the generalized trajectory triangulation problem, where non-concurrent multi-view imaging geometry is known but global image sequencing is not provided.  ...  We present GTT-Net, a supervised learning framework for the reconstruction of sparse dynamic 3D geometry.  ...  Figure 11 : 11 Qualitative results on unsynchronized multi-view video capture. GTT-Net was not trained on the test domain. CMU Mocap ( http://mocap.cs.cmu.edu/)  ... 
arXiv:2109.03408v1 fatcat:jofq4xpytba37jwkqvqvqzd7n4

Camera Alignment Using Trajectory Intersections in Unsynchronized Videos

Thomas Kuo, Santhoshkumar Sunderrajan, B.S. Manjunath
2013 2013 IEEE International Conference on Computer Vision  
To the best of our knowledge, this is one of the first attempts to align views that are unsynchronized with variable frame rates.  ...  This paper addresses the novel and challenging problem of aligning camera views that are unsynchronized by low and/or variable frame rates using object trajectories.  ...  Their proposed synchronization method requires the camera geometry of 3 views, and first roughly synchronizes cameras using the points of maximum curvature.  ... 
doi:10.1109/iccv.2013.143 dblp:conf/iccv/KuoSM13 fatcat:2pr2kgicd5gmva4crozxyb6koa

Making of Who Cares? HD Stereoscopic Free Viewpoint Video

C. Lipski, F. Klose, K. Ruhl, M. Magnor
2011 2011 Conference for Visual Media Production  
We present a detailed blueprint of our stereoscopic freeviewpoint video system. Using unsynchronized footage as input, we can render virtual camera paths in the post-production stage.  ...  The movement of the virtual camera also extends to the temporal domain, so that slow-motion and freeze-and-rotate shots are possible.  ...  Acknowledgements This work has been funded by the European Research Council ERC under contract No.256941 "Reality CG" and by the German Science Foundation, DFG MA 2555/1-3.  ... 
doi:10.1109/cvmp.2011.7 dblp:conf/cvmp/LipskiKRM11 fatcat:rtibpsbmm5balc5ee7eubcmqvu

Visual odometry with unsynchronized multi-cameras setup for intelligent vehicle application

Rawia Mhiri, Pascal Vasseur, Stephane Mousset, Remi Boutteau, Abdelaziz Bensrhair
2014 2014 IEEE Intelligent Vehicles Symposium Proceedings  
Every two neighbouring cameras share a common field of view in order to have a full view all around the vehicle. The proposed model is flexible, the number of cameras can be changed conveniently.  ...  When at least two cameras are used, the epipolar geometry constraint can then be used in order to deduce the metric scale [17] .  ... 
doi:10.1109/ivs.2014.6856533 dblp:conf/ivs/MhiriVMBB14 fatcat:mr2gvhj4qzcdjisqdp4od35pqu

A toolchain for capturing and rendering stereo and multi-view datasets

Felix Klose, Christian Lipski, Kai Ruhl, Benjamin Meyer, Marcus Magnor
2011 2011 International Conference on 3D Imaging (IC3D)  
Index Terms-Stereoscopic 3D, Multi-View Stereo, Unsynchronized Cameras.  ...  Our tools take video data from set of sparse unsynchronized cameras and give great freedom during the post production.  ...  One of which is the camera calibration, others are reconstructing geometry or synthesizing novel viewpoints.  ... 
doi:10.1109/ic3d.2011.6584392 dblp:conf/ic3d/KloseLRMM11 fatcat:rp4ceut3nbdpjjrrlocm4o7kki
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