Motion Capture from Dynamic Orthographic Cameras
2011 (English)In: 4DMOD - 1st IEEE Workshop on Dynamic Shape Capture and Analysis, 2011Conference paper (Refereed)
We present an extension to the scaled orthographic camera model. It deals with dynamic cameras looking at faraway objects. The camera is allowed to change focal lengthand translate and rotate in 3D. The model we derive saysthat this motion can be treated as scaling, translation androtation in a 2D image plane. It is valid if the camera and itstarget move around in two separate regions that are smallcompared to the distance between them.We show two applications of this model to motion capture applications at large distances, i.e. outside a studio,using the afﬁne factorization algorithm. The model is usedto motivate theoretically why the factorization can be carried out in a single batch step, when having both dynamiccameras and a dynamic object. Furthermore, the model isused to motivate how the position of the object can be reconstructed by measuring the virtual 2D motion of the cameras. For testing we use videos from a real football gameand reconstruct the 3D motion of a footballer as he scoresa goal.
Place, publisher, year, edition, pages
Computer Vision and Robotics (Autonomous Systems)
IdentifiersURN: urn:nbn:se:kth:diva-51110DOI: 10.1109/ICCVW.2011.6130445ISI: 000300056700231ScopusID: 2-s2.0-84856626223OAI: oai:DiVA.org:kth-51110DiVA: diva2:463415
4DMOD - 1st IEEE Workshop on Dynamic Shape Capture and Analysis. Barcelona, Spain. 2011-11-13.
QC 201112132011-12-092011-12-092013-12-18Bibliographically approved