结合目标检测的人体行为识别

周波; 李俊峰

doi:10.16383/j.aas.c180848

结合目标检测的人体行为识别

doi: 10.16383/j.aas.c180848

周波^1,,
李俊峰^1,

1.
浙江理工大学机械与自动控制学院自动化研究所杭州 310018

基金项目: 国家自然科学基金(61374022), 浙江省基础公益研究计划项目(LGG18F030001), 金华市科学技术研究计划重点项目(2018-1-027)资助

详细信息

作者简介:
周波：浙江理工大学硕士研究生. 2017年获浙江理工大学机械与自动控制学院学士学位. 主要研究方向为深度学习, 计算机视觉与模式识别. E-mail: zhoubodewy@163.com

李俊峰：浙江理工大学机械与自动控制学院副教授. 2010年获得东华大学工学博士学位. 主要研究方向为图像质量评价, 人体行为识别, 产品视觉检测. 本文通信作者. E-mail: ljf2003@zstu.edu.cn

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出版历程
- 收稿日期: 2018-12-26
- 录用日期: 2019-06-06
- 网络出版日期: 2020-09-28
- 刊出日期: 2020-09-28

Human Action Recognition Combined With Object Detection

ZHOU Bo^1
,,
LI Jun-Feng^1
,

1.
Institute of Automation, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018

Funds: Supported by National Basic Research Program of China (61374022), Zhejiang Basic Public Welfare Research Project (LGG18F030001), and Jinhua Science and Technology Research Program Key Project (2018-1-027)

摘要

摘要: 人体行为识别领域的研究方法大多数是从原始视频帧中提取相关特征, 这些方法或多或少地引入了多余的背景信息, 从而给神经网络带来了较大的噪声. 为了解决背景信息干扰、视频帧存在的大量冗余信息、样本分类不均衡及个别类分类难的问题, 本文提出一种新的结合目标检测的人体行为识别的算法. 首先, 在人体行为识别的过程中增加目标检测机制, 使神经网络有侧重地学习人体的动作信息; 其次, 对视频进行分段随机采样, 建立跨越整个视频段的长时时域建模; 最后, 通过改进的神经网络损失函数再进行行为识别. 本文方法在常见的人体行为识别数据集UCF101和HMDB51上进行了大量的实验分析, 人体行为识别的准确率(仅RGB图像)分别可达96.0%和75.3%, 明显高于当今主流人体行为识别算法.
- 深度学习 /
- 行为识别 /
- 卷积神经网络 /
- 机器视觉 /
- 目标检测
Abstract: Most of the research methods in the field of human action recognition extract relevant features from the original video frames. These methods introduce more or less redundant background information, which brings more noise to the neural network. In order to solve the problem of background information interference, large amount of redundant information in video frames, unbalanced sample classification and difficult classification of individual classes, this paper proposes a new algorithm for human action recognition combined with object detection. Firstly, the object detection mechanism is added in the process of human action recognition, so that the neural network has a focus on learning the motion information of the human body. Secondly, the video is segmentally and randomly sampled to establish long-term time domain modeling across the entire video segment. Finally, action recognition is performed through an improved neural network loss function. In this work, a large number of experimental analyses are performed on the popular human action recognition datasets UCF101 and HDBM51. The accuracy of human action recognition (RGB images only) is 96.0% and 75.3%, respectively, which is significantly higher than the state-of-the-art human action recognition algorithms.
- Deep learning /
- action recognition /
- convolutional neural network (CNN) /
- computer vision /
- object detection

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图 1 VGG特征提取器

Fig. 1 VGG feature extractor

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图 2 区域候选网络

Fig. 2 Region proposal network

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图 3 边框回归与类别预测

Fig. 3 Boundding box regression and class prediction

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图 4 目标区域获取与图像变换

Fig. 4 Target area acquisition and image transformation

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图 5 视频分段随机采样

Fig. 5 Video segmentation and random sampling

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图 6 I3D网络

Fig. 6 Inflated inception network

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图 7 Focal loss参数$\alpha $敏感曲线

Fig. 7 Focal loss parameter $\alpha $ sensitivity curve

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图 8 不同Focal loss参数条件下实验精度直方图

Fig. 8 Experimental precision histogram under different focal loss parameters

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图 9 混淆矩阵

Fig. 9 Confusion matrix

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图 10 不同的输入图像下I3D网络测试精度对比

Fig. 10 Comparison of I3D network test accuracy under different inputs

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表 1 HMDB51与UCF101数据集在不同$ \alpha $值下的实验结果 $(\gamma = 1)$ (%)

Table 1 Experimental results of HMDB51 and UCF101 data sets at different $ \alpha $ values $(\gamma = 1)$ (%)

HMDB51-FL-$\alpha$	Split1	Split2	Split3	Average	UCF101-FL-$\alpha$	Split1	Split2	Split3	Average
0.10	60.6	56.5	58.7	58.6	0.1	76.8	77.4	78.4	77.5
0.25	76.6	73.6	74.9	75.0	0.25	95.4	96.3	95.4	95.7
0.50	76.8	73.8	75.2	75.3	0.5	95.5	96.3	95.9	95.9
0.75	76.7	73.9	75.1	75.2	0.75	95.7	96.4	95.6	95.9
0.90	76.7	73.8	75.1	75.2	0.9	95.5	96.2	95.7	95.8
1.00	76.7	73.8	75.1	75.2	1	95.6	96.3	95.8	95.9

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表 2 在 Focal loss 的不同参数值条件下的实验精度对比(%)

Table 2 Comparison of experimental precision under different parameter values of focal loss (%)

HMDB51	Split 1	Split 2	Split 3	Average	UCF101	Split 1	Split 2	Split 3	Average
$\alpha$= 0.50, $\gamma$= 0.50	65.3	62.8	63.5	63.9	$\alpha$= 0.50, $\gamma$= 0.50	78.3	78.9	77.4	78.2
$\alpha$= 0.50, $\gamma$= 0.75	70.8	67.5	69.2	69.2	$\alpha$= 0.50, $\gamma$= 0.75	86.8	88.4	87.4	87.5
$\alpha$= 0.50, $\gamma$= 2.00	76.6	73.7	75.1	75.1	$\alpha$= 0.50, $\gamma$= 2.00	95.4	96.3	96	95.9
$\alpha$= 0.50, $\gamma$= 5.00	76.9	73.8	75.3	75.3	$\alpha$= 0.50, $\gamma$= 5.00	95.6	96.3	95.8	95.9
$\alpha$= 0.75, $\gamma$= 3.00	76.7	73.7	75.2	75.2	$\alpha$= 0.75, $\gamma$= 3.00	95.5	96.2	95.7	95.8
$\alpha$= 0.75, $\gamma$= 5.00	76.7	73.7	75.1	75.2	$\alpha$= 0.75, $\gamma$= 5.00	95.7	96.4	95.9	96
$\alpha$= 0.90, $\gamma$= 10.0	76.3	73.4	74.7	74.8	$\alpha$= 0.90, $\gamma$= 10.0	95	95.9	95.5	95.5

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表 3 UCF101与HMDB51数据集实验结果(%)

Table 3 Experimental results of UCF101 and HMDB51 (%)

UCF101-Input	Split 1	Split 2	Split 3	Average	HMDB51-Input	Split 1	Split 2	Split 3	Average
CI	87.6	91.7	90.9	90.1	CI	71.3	67.1	68.8	69.7
WI	90.4	92.2	92.5	91.7	WI	74.1	70.2	70.6	71.6
RI	95.2	95.8	95.4	95.5	RI	75.9	73.1	75.0	74.7
CI+RI	91.7	92.7	92.9	92.4	CI+RI	73.3	71.8	72.0	72.4
WI+RI	95.7	96.4	96.0	96.0	WI+RI	76.8	73.9	75.3	75.3

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表 4 不同算法在UCF101和HMDB51数据集上识别准确率对比(%)

Table 4 Comparison with the state-of-the-art on UCF101 and HMDB51 (%)

算法	Pre-training	UCF101	HMDB51
LTC^[28]	Sports-1M	82.4	48.7
C3D^[23]	Sports-1M	85.8	54.9
TSN^[24]	ImageNet	86.4	53.7
DTPP^[29]	ImageNet	89.7	61.1
C3D^[5]	Kinetics	89.8	62.1
T3D^[30]	Kinetics	91.7	61.1
ARTNet^[31]	Kinetics	94.3	70.9
TSN^[24]	ImageNet+Kinetics	91.1	−
I3D^[2]	ImageNet+Kinetics	95.6	74.8
PM without TS & FL	ImageNet+Kinetics	95.8	95.1
PM without FL	ImageNet+Kinetics	95.9	75.1
PM without TS	ImageNet+Kinetics	95.9	75.2
Proposed method (all)	ImageNet+Kinetics	96.0	75.3

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