IEEE Trans Cybern. 2018 Sep;48(9):2643-2655. doi: 10.1109/TCYB.2017.2747998. Epub 2017 Sep 12.
In this paper, we propose a novel and robust tracking framework based on online discriminative and low-rank dictionary learning. The primary aim of this paper is to obtain compact and low-rank dictionaries that can provide good discriminative representations of both target and background. We accomplish this by exploiting the recovery ability of low-rank matrices. That is if we assume that the data from the same class are linearly correlated, then the corresponding basis vectors learned from the training set of each class shall render the dictionary to become approximately low-rank. The proposed dictionary learning technique incorporates a reconstruction error that improves the reliability of classification. Also, a multiconstraint objective function is designed to enable active learning of a discriminative and robust dictionary. Further, an optimal solution is obtained by iteratively computing the dictionary, coefficients, and by simultaneously learning the classifier parameters. Finally, a simple yet effective likelihood function is implemented to estimate the optimal state of the target during tracking. Moreover, to make the dictionary adaptive to the variations of the target and background during tracking, an online update criterion is employed while learning the new dictionary. Experimental results on a publicly available benchmark dataset have demonstrated that the proposed tracking algorithm performs better than other state-of-the-art trackers.
在本文中,我们提出了一种新颖而鲁棒的跟踪框架,基于在线判别和低秩字典学习。本文的主要目的是获得紧凑且低秩的字典,这些字典可以为目标和背景提供良好的判别表示。我们通过利用低秩矩阵的恢复能力来实现这一点。也就是说,如果我们假设同一类别的数据是线性相关的,那么从每个类别训练集中学到的相应基向量将使字典变得近似低秩。所提出的字典学习技术结合了重构误差,提高了分类的可靠性。此外,设计了一个多约束目标函数,以实现判别和鲁棒字典的主动学习。进一步,通过迭代计算字典、系数,并同时学习分类器参数,获得最优解。最后,实现了一个简单而有效的似然函数来估计跟踪过程中目标的最优状态。此外,为了使字典在跟踪过程中适应目标和背景的变化,在学习新字典时采用了在线更新准则。在一个公开的基准数据集上的实验结果表明,所提出的跟踪算法优于其他最先进的跟踪器。
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