核相关滤波跟踪算法的尺度自适应改进

针对基于检测的核相关滤波跟踪（CSK）算法难以适应目标尺度变化的问题，提出多尺度核相关滤波分类器以实现尺度自适应目标跟踪。首先，采用多尺度图像构建样本集，训练多尺度核相关滤波分类器，通过分类器对目标的尺度估计实现目标的最佳尺度检测；然后，在最佳尺度下采集样本在线学习更新分类器，实现尺度自适应的目标跟踪。对比实验与分析表明，本文算法在目标跟踪过程中能够正确适应目标的尺度变化，相比CSK算法，偏心距误差减少至其1/5~1/3，能满足复杂场景长时间跟踪的需求。

Scale adaptive improvement of kernel correlation filter tracking algorithm

To solve the problem that Circulant Structure of tracking-by-detection with Kernels (CSK) is difficult to adapt to the target scale change, a multi-scale kernel correlation filter classifier was proposed to realize the scale adaptive target tracking. Firstly, the multi-scale image was used to construct the sample set, the multi-scale kernel correlation filtering classifier was trained by the sample set, for target size estimation to achieve the goal of the optimal scale detection, and then the samples collected on the optimal target scale were used to update the classifier on-line to achieve the scale-adaptive target tracking. The comparative experiments and analysis illustrate that the proposed algorithm can adapt to the scale change of the target in the tracking process, the error of the eccentricity is reduced to 1/5 to 1/3 that of CSK algorithm, which can meet the needs of long time tracking in complex scenes.