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GRASP Lab Seminar 2003-2004
July 8 (Thursday), 2:00 PM, Levine Hall 307, hosted by Kostas Daniilidis.
Rodrigo Carceroni
Universidade Federal de Minas Gerais (UFMG), Brazil
Linear Video Alignment
Abstract: I will discuss the problem of temporally aligning two or more videos of a dynamic 3D scene, captured simultaneously from distinct viewpoints. Informally, the problem involves computing the relative frame rate between the videos and their temporal shift, if any. After motivating the problem and describing potential applications in video analysis, I will talk about a solution that will be (was) presented at CVPR'04 as a poster.
Unlike existing methods, which only work for two videos and rely on a computationally-intensive search in the space of temporal alignments, we reduce the problem for N views to the robust estimation of a single line in R^N. This line captures all temporal relations between the videos and can be computed without any prior knowledge of these relations. Experimental results show that the method can accurately align videos even when they have large mis-alignments (e.g., hundreds of frames), when the problem is seemingly ambiguous (e.g., scenes with roughly periodic motion), and when accurate manual alignment is difficult (e.g., due to slow-moving objects). This is joint work with Flavio Padua, Geraldo Santos (UFMG, Brazil) and Kyros Kutulakos (U. Toronto).Biography: TBA
