
FOLLOWUS
Institute of Artificial Intelligence, College of Computer Science and Technology, Zhejiang University, Hangzhou 310027, China
†E-mail:fengjiageng@126.com
收稿:2015-03-18,
修回:2015-10-12,
录用:2015-09-14,
纸质出版:2015-11
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基于鲁棒局部自适应多视角学习的视点无关人体行为识别[J]. 信息与电子工程前沿(英文), 2015,16(11):917-929.
Feng Jia-geng, Xiao Jun. View-invariant human action recognition via robust locally adaptive multi-view learning*[J]. Frontiers of Information Technology & Electronic Engineering, 2015, 16(11): 917-929.
基于鲁棒局部自适应多视角学习的视点无关人体行为识别[J]. 信息与电子工程前沿(英文), 2015,16(11):917-929. DOI: 10.1631/FITEE.1500080.
Feng Jia-geng, Xiao Jun. View-invariant human action recognition via robust locally adaptive multi-view learning*[J]. Frontiers of Information Technology & Electronic Engineering, 2015, 16(11): 917-929. DOI: 10.1631/FITEE.1500080.
目的
2
基于视觉的人体行为识别是一个非常活跃的研究领域。它在智能监控、感知接口和基于内容的视频检索等领域具有广泛的应用前景。然而,一些现实应用场景仍然阻碍行为识别技术的发展,比如现实场景中的动作往往是从任意角度拍摄的。因此与视点无关的行为识别显得十分重要。大量研究者开始致力于行为识别的视点无关性。本文提出一种基于多视角学习的视点无关人体行为识别方法。
创新点
2
针对现有多视角学习算法在构建近邻图时缺乏数据自适应性的问题,本文提出一种自适应多视角学习算法。此外,还提出一种迭代优化求解方法对所构建的目标函数进行优化求解。
方法
2
对于单个视角下的所有样本特征数据,构建一个该视角下的L1图。在获得数据的稀疏图结构后,对于单视角下的数据,希望学习一种最优的降维方法,在对原始数据进行降维的同时,最大程度地保持数据内在的局部结构信息;对于不同的视角,取一个非负的权重向量来衡量不同视角的重要程度。对于全部的视角可以统一起来得到目标函数。最后利用迭代优化求解,用支持向量机(SVM)分类。
结论
2
将本文所提算法应用到视点无关的行为识别中,实验结果表明:该算法能够自适应地选择近邻数与不同特征的权重;与其他几种对比算法相比,本文所提算法的分类准确率更高。
Human action recognition is currently one of the most active research areas in computer vision. It has been widely used in many applications
such as intelligent surveillance
perceptual interface
and content-based video retrieval. However
some extrinsic factors are barriers for the development of action recognition; e.g.
human actions may be observed from arbitrary camera viewpoints in realistic scene. Thus
view-invariant analysis becomes important for action recognition algorithms
and a number of researchers have paid much attention to this issue. In this paper
we present a multi-view learning approach to recognize human actions from different views. As most existing multi-view learning algorithms often suffer from the problem of lacking data adaptiveness in the nearest neighborhood graph construction procedure
a robust locally adaptive multi-view learning algorithm based on learning multiple local L1-graphs is proposed. Moreover
an efficient iterative optimization method is proposed to solve the proposed objective function. Experiments on three public view-invariant action recognition datasets
i.e.
ViHASi
IXMAS
and WVU
demonstrate data adaptiveness
effectiveness
and efficiency of our algorithm. More importantly
when the feature dimension is correctly selected (i.e.
>60)
the proposed algorithm stably outperforms state-of-the-art counterparts and obtains about 6% improvement in recognition accuracy on the three datasets.
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