Skeleton-Based Human Action Recognition via Screw Matrices |
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Authors: | DING Wenwen LIU Kai XU Biao CHENG Fei |
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Affiliation: | 1. School of Computer Science and Technology, Xidian University, Xi'an 710071, China;School of Mathematical Sciences, Huaibei Normal University, Anhui 235000, China;2. School of Computer Science and Technology, Xidian University, Xi'an 710071, China;3. School of Mathematical Sciences, Huaibei Normal University, Anhui 235000, China |
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Abstract: | With the recent advent of low-cost acqui-sition depth cameras, extracting 3D body skeleton has be-come relatively easier, which significantly lighten many dif-ficulties in 2D videos including occlusions, shadows and background extraction, etc. Directly perceived features, for example points, lines and planes, can be easily ex-tracted from 3D videos such that we can employ rigid motions to represent skeletal motions in a geometric way. We apply screw matrices, acquired by using rotations and translations in 3D space, to model single and multi-body rigid motion. Since screw matrices are members of the special Euclidean group SE(3), an action can be repre-sented as a point on a Lie group, which is a differen-tiable manifold. Using Lie-algebraic properties of screw al-gebra, isomorphic to se(3), the classical algorithms of ma-chine learning in vector space can be expanded to man-ifold space. We evaluate our approached on three public 3D action datasets: MSR Action3D dataset, UCF Kinect dataset and Florence3D-Action Dataset. The experimental results show that our approaches either match or exceed state-of-the-art skeleton-based human action recognition approaches. |
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Keywords: | Skeleton joints Human activity recogni-tion Screw algebra Lie group Lie algebra |
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