激光与光电子学进展, 2018, 55 (6): 061009, 网络出版: 2018-09-11   

基于时空方向主成分直方图的人体行为识别 下载: 1075次

Action Recognition Based on Histogram of Spatio-Temporal Oriented Principal Components
徐海洋 1孔军 1,2,1; 2; 蒋敏 1昝宝锋 1
作者单位
1 江南大学物联网工程学院, 江苏 无锡 214122
2 新疆大学电气工程学院, 新疆 乌鲁木齐 830047
摘要
为解决由视角、尺度等变化造成的行为类内差别大的问题,提出一种基于时空方向主成分直方图(HSTOPC)的人体行为识别方法。首先,将深度图序列转换为三维(3D)点云序列,对此序列采用新颖的图像预处理方法获得新的深度图序列,即在空间和时间维度上对采样获得的深度图序列进行限制,除去一些动作信息量较少的序列和空间,从而降低输入数据的冗余减少空间尺度变化的影响;其次,为了解决帧间关联性较弱的问题,采用时空方向主成分方法描述新的点云序列,获得3D点云序列中每点的方向特征;然后,对3D点云序列中所有方向特征进行多层时域重叠分割,获得HSTOPC特征描述子;最后,采用支持向量机分类器进行训练、测试。在3个标准数据库上的实验结果表明,提出的HSTOPC特征描述子对噪声、运动速度变化、视角变化和时域不对齐具有很好的稳健性,可以显著提高人体行为识别的准确率。
Abstract
In order to solve the problem of inter-class difference caused by the angle of view and scale change, we propose a method based on histogram of spatio-temporal oriented principal components of three-dimensional (3D) point clouds for action recognition. Firstly, the depth sequences are converted into 3D point clouds sequences. Then, we use a novel image preprocessing method to get new depth sequences. Namely, the sampled depth sequences are limited in spatio-temporal dimension to remove areas with less information, and reduce the redundancy of the input data and the influence of space scale change In order to solve the problem of weak correlation between frames, we adopt histogram of spatio-temporal oriented principal components (HSTOPC) method to describe 3D point clouds sequences and obtain the direction of each point of the 3D point clouds in sequences. For all direction of 3D point clouds in sequences, we use multilayer overlapping segmentation method to obtain HSTOPC descriptor. Finally, we use the support vector machine classifier for training and test. Experimental results on three human action recognition datasets show that the proposed HSTOPC feature descriptor has better robust for noise, rate variations, view change and temporal misalignment, and is able to improve the accuracy of human behavior recognition significantly.

徐海洋, 孔军, 蒋敏, 昝宝锋. 基于时空方向主成分直方图的人体行为识别[J]. 激光与光电子学进展, 2018, 55(6): 061009. Haiyang Xu, Jun Kong, Min Jiang, Baofeng Zan. Action Recognition Based on Histogram of Spatio-Temporal Oriented Principal Components[J]. Laser & Optoelectronics Progress, 2018, 55(6): 061009.

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