为提高光照变化下目标跟踪算法的精度和鲁棒性, 基于稀疏表示理论, 提出一种光照补偿和多任务稀疏表示联合优化算法。该算法首先根据目标模板与候选目标的平均亮度差异对目标模板光照补偿, 而后利用候选目标构建过完备字典以稀疏表示光照补偿后的目标模板, 并将所得问题转化为一个多任务优化问题, 然后利用所得稀疏编码矩阵快速剔除无关候选目标, 最后基于重构误差对剩余候选目标进行局部结构化评估, 进而实现目标的精确跟踪。实验结果表明, 与现有主流算法相比, 剧烈光照变化情况下, 所提方法可显著改善目标跟踪精度及鲁棒性。

To improve the accuracy and robustness of the target tracking algorithm under illumination changes, a joint optimization algorithm combining illumination compensation with multi-task sparse representation is proposed based on the sparse representation theory.First,the algorithm compensates for the illumination of the template according to the average brightness difference between the template and the candidate target.Then,the candidate target is used to construct an over-complete dictionary to represent the template after illumination compensation,and the problem is transformed into a multi-task optimization problem.Moreover,the sparse coding matrix is used to quickly eliminate unrelated candidates.Finally,based on the reconfiguration error,a local structured assessment is carried out on the remaining candidates,so as to realize accurate target tracking.Simulation results show that the proposed algorithm can significantly improve the accuracy and robustness of target tracking under severe illumination changes compared with the existing state-of-the-art algorithms.