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2015年6月17日学术报告:Handling Occlusion and Large Displacement through Improved RGB-D Scene Flow Estimation


添加时间:2015-06-15 21:34:15



题目: Handling Occlusion and Large Displacement through Improved RGB-D Scene Flow Estimation
时间: 2015年6月17日(星期三),上午十点

报告人:张健教授,悉尼科技大学
地点: 中教1003


Abstract: The accuracy of scene flow is restricted by several challenges such as occlusion and large displacement motion. When occlusion happens, the positions inside the occluded regions lose their corresponding counterparts in preceding and succeeding frames.
Large displacement motion will increase the complexity of motion modeling and computation. Moreover, occlusion and large displacement motion are highly related problems in scene flow estimation, e.g. large displacement motion often leads to considerably occluded regions in the scene.
An improved dense scene flow method based on RGB-D data is proposed in this paper. To handle occlusion, we model the occlusion status for each point in our problem formulation, and jointly estimate the scene flow and occluded regions. To deal with large displacement motion, we employ an over-parameterized scene flow representation to model both the rotation and translation components of the scene flow, since large displacement motion cannot be well approximated using translational motion only. Furthermore, we employ a two-stage optimization procedure for this over-parameterized scene flow representation. In the first stage, we propose a new RGB-D PatchMatch method, which is mainly applied in the RGB-D image space to reduce the computational complexity introduced by the large displacement motion.

 

Dr. Jian Zhang is an Associate professor, University of Technology, Sydney, Australia, received the BSc. degree from East China Normal University, Shanghai, China, in 1982; the MSc. degree in computer science from Flinders University, Adelaide, Australia, in 1994; and the Ph.D. degree in electrical engineering from the University of New South Wales (UNSW), Sydney, Australia, in 1999.
He is an IEEE Senior Member. He was Technical Program Chair, 2008 IEEE Multimedia Signal Processing Workshop; Associated Editor, IEEE Transactions on Circuits and Systems for Video Technology (T-CSVT) and Associated Editor, EURASIP Journal on Image and Video Processing. Dr Zhang was Guest Editor of T-CSVT for Video Technology for Special Issue (March 2007) of the Convergence of Knowledge Engineering Semantics and Signal Processing in Audiovisual Information Retrieval. As a General Co-Chair, Jian chaired the International Conference on Multimedia and Expo (ICME 2012) in Melbourne Australia 2012. As a Technical Program Co-Chair, Jian chaired The IEEE Visual Communications and Image Processing (IEEE VCIP 2014).



作者:宋浩