Human detection in images via piecewise linear support vector machines.
Human detection in images is challenged by the view and posture variation problem. In this paper, we propose a piecewise linear support vector machine (PL-SVM) method to tackle this problem. The motivation is to exploit the piecewise discriminative function to construct a nonlinear classification boundary that can discriminate multiview and multiposture human bodies from the backgrounds in a high-dimensional feature space. A PL-SVM training is designed as an iterative procedure of feature space division and linear SVM training, aiming at the margin maximization of local linear SVMs. Each piecewise SVM model is responsible for a subspace, corresponding to a human cluster of a special view or posture. In the PL-SVM, a cascaded detector is proposed with block orientation features and a histogram of oriented gradient features. Extensive experiments show that compared with several recent SVM methods, our method reaches the state of the art in both detection accuracy and computational efficiency, and it performs best when dealing with low-resolution human regions in clutter backgrounds.
School of Electronics and Communication Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China. qxye@gucas.ac.cn
Qixiang
Q
Ye
Zhenjun
Z
Han
Jianbin
J
Jiao
Jianzhuang
J
Liu
D000203:Activities of Daily Living; D000818:Animals; D016208:Databases, Factual; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D060388:Support Vector Machine; D014741:Video Recording