潘迪夫 李耀通 韩锟

摘    要：针对复杂跟踪环境条件下目标的跟踪失败问题，提出一种基于多相关滤波器组合的目标跟踪方法.首先2个分别采用颜色属性（Color Name，CN）特征和方向梯度直方图（Histogram of Oriented Gradient，HOG）特征的核相关滤波器（Kernelized Correlation Filter，KCF）通过自适应融合手段进行响应图信息融合，确定目标的预测位置;然后通过以目标区域为基础进行多尺度采样，提取CN-HOG拼接特征构建尺度相关滤波器，得到目标的最佳尺度;最后设计了模型的自适应更新策略，通過判断目标是否发生遮挡来决定是否在当前帧进行模型更新.在50组视频序列上对所提算法与6种当前主流的相关滤波跟踪算法进行了实验.实验结果表明，在复杂的跟踪环境条件下，所提算法取得了最好的跟踪精度和成功率，能够有效处理目标遮挡和尺度变化等问题，且具有较快的跟踪速度.

关键词：目标跟踪;相关滤波;尺度评估;模型自适应更新

中图分类号：TP391                            文献标志码：A

A Target Tracking Method Based on Multi-correlation Filter Combination

PAN Difu，LI Yaotong，HAN Kun

（School of Traffic and Transportation Engineering，Central South University，Changsha 410075，China ）

Abstract： To cope with the problem of object tracking failure in the challenging environment， a target tracking method based on multi-correlation filter combination was proposed. Firstly， two kernelized correlation filters（KCF） based on color name（CN） features and histogram of oriented gradient（HOG） features， respectively， integrated the map information through adaptive fusion method， and were used to determine the prediction position of the target. Then， through the multi-scale sampling based on the target region， CN-HOG compositive feature was extracted to construct a scale correlation filter to obtain the optimal scale of target. Finally， the adaptive updating strategy of the model was designed to determine whether the model was updated in the current frame through determining whether the target was occluded. The proposed algorithm and 6 state-of-the-art methods were tested on 50 video sequences. The experiment results indicate that the proposed algorithm gains the best precision and success rate in the challenging environment， it can effectively deal with the problem of object occlusion and scale change， and it has a fast tracking speed.

Key words： object tracking;correlation filter;scale estimate;model adaptive updating

视觉跟踪在计算机视觉应用领域中扮演着重要的角色[1-3]，例如视频监控、人机交互、机器人技术和增强现实等.目前，基于相关滤波（Correlation Filters，CF）的跟踪算法因其高精度、高鲁棒性、速度快的特点[4]，引起了相关学者们的广泛关注和研究.针对目标表征建模的相关滤波跟踪算法主要分为两类：单模型和多模型.单模型是指采用单特征来训练分类器的相关滤波跟踪算法，主要包括采用灰度特征的核循环结构跟踪器（CSK）[4]、使用CN特征扩展稠密采样跟踪器（CN）[5]、采用HOG特征的……