Differential tracking with a kernel-based region covariance descriptor

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• 作者：Yuwei Wu (1)
  Bo Ma (1)
  Yunde Jia (1)
  
  1. Beijing Laboratory of Intelligent Information Technology ; School of Computer Science ; Beijing Institute of Technology ; Beijing ; 100081 ; People鈥檚 Republic of China
  
• 关键词：Object tracking ; Region covariance descriptor ; Appearance changes ; Affine transformation
• 刊名：Pattern Analysis & Applications
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：18
• 期：1
• 页码：45-59
• 全文大小：2,685 KB
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• 刊物类别：Computer Science
• 刊物主题：Pattern Recognition
  
• 出版者：Springer London
• ISSN：1433-755X

文摘

The covariance descriptor has received an increasing amount of interest in visual tracking. However, the conventional covariance tracking algorithms fail to estimate both the scale and orientation of an object. In this paper, we present a kernel-based region covariance descriptor to address this issue. An affine kernel function is incorporated to the covariance matrix to effectively control the correlations among extracted features inside the object region. Under the Log-Euclidean Riemannian metric, we construct a region similarity measure function that describes the relationship between the candidate and a given appearance template. The tracking task is then implemented by minimizing the similarity measure, in which the gradient descent method is utilized to iteratively optimize affine transformation parameters. In addition, the template is dynamically updated by computing the geometric mean of covariance matrices in Riemannian manifold for adapting to the appearance changes of the object over time. Experimental results compared with several relevant tracking methods demonstrate the good performance of the proposed algorithm under challenging conditions.