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Abstract

Pedestrian tracking is a hotspot and a difficult topic in computer vision research. Through the tracking of pedestrians in video materials, trajectories can be extracted to support the analysis of individual or collected behavior dynamics. In this review, we first discuss the difference between pedestrian tracking and pedestrian detection. Then we summarize the development of traditional tracking algorithms and deep learning-based tracking algorithms, and introduce classic pedestrian dynamic models. In the end, typical applications, including intelligent monitoring, congestion analysis, and anomaly detection are introduced systematically. With the rising use of big data and deep learning techniques in the area of computer vision, the research on pedestrian tracking has made a leap forward, which can support more accurate, timely extraction of behavior patterns and then to facilitate large-scale dynamic analysis of individual or crowd behavior.

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Authors and contacts

Corresponding author:Lu Xin,xin.lu@flowminder.org

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预测阶段	更新阶段
$\hat { x}_k^ - \!=\! { A}\hat { x}_{k-1}^ - \!+\! { B}{ U_{k - 1} }$	${ { K}_k} \!=\! { P}_k^ - { { H}^{\rm T} }{({ {HP} }_k^ - { { H}^{\rm T} } \!+\! { R})^{ - 1} }$
${ P}_k^ - \!=\! { A}{ { P}_{k - 1} }{ { A}^T} \!+\! { Q}$	${ {\hat { x} }_k} \!=\! \hat { x}_k^ - \!+\! { { K}_k}({ { y}_k} \!-\! { H}\hat { x}_k^ - )$
${ P}_k^ - \!=\! { A}{ { P}_{k - 1} }{ { A}^T} \!+\! { Q}$	${{ P}_k} = ({ I} - {{ K}_k}{ H}){ P}$

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参数	含义
$\hat { x}_k^-$	目标在$k$时刻的先验状态估计值, 包括目标的位置、速度等参数, 一般是$n$维向量
${ {\hat { x}}_k}$	目标在$k$时刻的后验状态估计值, 是对$\hat { x}_k^-$应用卡尔曼滤波更新后的值
${{\hat { x}}_{k - 1}}$	目标在$k-1$时刻的后验状态估计值
${ A}$	状态转移矩阵, 一般是$n \times n$阶的方阵
${ B}$	控制矩阵, 一般为0
${ U}_{k-1}$	外部控制量, 一般也为0
${ P}_k^-$	$k$时刻的先验误差协方差矩阵, 需要事先给定一个初始值, 以后的值可以由卡尔曼滤波递归得到
${ P}_k$	$k$时刻的后验误差协方差矩阵, 是对${ P}_k^-$的修正
${ K}_k$	卡尔曼增益
${ y}_k$	测量值, 一般只能测量目标的位置, 是$m$维向量
${ Q}$	系统噪声协方差矩阵, 是一个需要调节的参数, 一般假定它是一个固定的值, 在实验中需要通过不断调节$Q$值, 来寻找滤波器的最优值
${ R}$	观测噪声协方差矩阵, 和测量仪器有关, 在实验中要不断尝试来确定最优的${ R}$值
${ H}$	观测矩阵, 是$m \times n$阶矩阵, 用于将$m$维的测量值${ y}_k$转换为与预测值${{\hat { x}}_k}$相同的$n$维向量

DownLoad: CSV

算法	MOTA↑	MOTP↑	MT↑	ML↓	IDS↓	数据集	类别
卡尔曼滤波^[64]	85.00%	—	—	—	—	MIT Traffic video dataset	传统跟踪算法
多假设跟踪算法^[21]	29.10%	71.70%	12.10%	53.30%	476	MOT Benchmark	传统跟踪算法
粒子滤波算法^[27]	—	—	80.80%	0.70%	10	CAVIAR dateset	传统跟踪算法
基于马尔科夫决策的多目标跟踪算法^[31]	30.30%	71.30%	13.00%	38.40%	680	MOT Benchmark	传统跟踪算法
相关滤波算法^[65]	83.40%	73.50%	—	—	—	Urban Tracker dataset	传统跟踪算法
基于Faster-RCNN的跟踪算法^[66]	38.50%	72.60%	8.70%	37.40%	586	MOT 15 Benchmark	深度学习跟踪算法
基于YOLOV3的跟踪算法^[67]	60.50%	79.30%	30.20%	19.60%	1129	MOT 16 Benchmark	深度学习跟踪算法

DownLoad: CSV

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Vol. 69, Issue 8 - 2020-04-20

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