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Finding Actions Using Shape Flows

  • Hao Jiang
  • David R. Martin
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5303)

Abstract

We propose a novel method for action detection based on a new action descriptor called a shape flow that represents both the shape and movement of an object in a holistic and parsimonious manner. We find actions by finding shape flows in a target video that are similar to a template shape flow. Shape flows are largely independent of appearance, and the match cost function that we propose is invariant to scale changes and smooth nonlinear deformation in space and time. The problem of matching shape flows is difficult, however, yielding a large, non-convex, integer program. We propose a novel relaxation method based on successive convexification that converts this hard program into a vastly smaller linear program: By using only those variables that appear on the 4D lower convex hull of the matching cost volume, most of the variables in the linear program may be eliminated. Experiments confirm that the proposed shape flow method can successfully detect complex actions in cluttered video, even with self-occlusion, camera motion, and intra-class variation.

Keywords

Action Recognition Delaunay Triangulation Camera Motion Background Clutter Joint Trajectory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Hao Jiang
    • 1
  • David R. Martin
    • 1
  1. 1.Computer Science DepartmentBoston College, Chestnut HillUSA

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