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An offline bidirectional tracking scheme Host Publication: Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet Authors: T. Caljon, V. Enescu, P. Schelkens and H. Sahli Publisher: Lecture Notes in Computer Science, Nr. 3708, pp. 587-594, Publication Date: Aug. 2005 Number of Pages: 8 ISBN: 3-540-29032-X
Abstract: A generic bi-directional scheme is proposed that robustifies the estimation of the maximum-a-posteriori (MAP) sequence of states of a visual object. It enables creative, non-technical users to obtain the path of interesting objects in offline available video material, which can then be used to create interactive movies. To robustify against tracker failure the proposed scheme merges the filtering distributions of a forward tracking particle filter and a backward tracking particle filter at some timesteps, using a reliability-based voting scheme such as in democratic integration. The MAP state sequence is obtained using the Viterbi
algorithm on reduced state sets per timestep and is interpolated linearly where tracking failure is suspected. The presented scheme is generic, simple and efficient and shows good results for a color-based particle filter.
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