Article(id=1251893512128639586, tenantId=1146029695717560320, journalId=1251234473337991274, issueId=1251893504037831074, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1003-3114.2025.05.015, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1747065600000, receivedDateStr=2025-05-13, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1776404272348, onlineDateStr=2026-04-17, pubDate=1758124800000, pubDateStr=2025-09-18, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1776404272348, onlineIssueDateStr=2026-04-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1776404272348, creator=13701087609, updateTime=1776404272348, updator=13701087609, issue=Issue{id=1251893504037831074, tenantId=1146029695717560320, journalId=1251234473337991274, year='2025', volume='51', issue='5', pageStart='877', pageEnd='1134', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1776404270419, creator=13701087609, updateTime=1776404832543, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1251895861849043019, tenantId=1146029695717560320, journalId=1251234473337991274, issueId=1251893504037831074, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1251895861849043020, tenantId=1146029695717560320, journalId=1251234473337991274, issueId=1251893504037831074, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1025, endPage=1035, ext={EN=ArticleExt(id=1251893512413852269, articleId=1251893512128639586, tenantId=1146029695717560320, journalId=1251234473337991274, language=EN, title=Enhanced Estimation Algorithm Based on YOLOv8n-Pose Key Point Features, columnId=1251893508886446519, journalTitle=Radio Communications Technology, columnName=Special Topic:Frontiers in Intelligent Communication, Storage, and Information Processing Technologies, runingTitle=null, highlight=null, articleAbstract=

Existing key point detection algorithms tend to suffer from reduced detection precision, missed detections, or misaligned key points in scenarios with varying lighting conditions and dense crowds with overlapping figures. To address this issue, an improved LBW-YOLOv8n-Pose algorithm for multi-person pose estimation in complex environments is proposed based on YOLOv8n-Pose. By introducing the Large Separable Kernel Attention (LSKA) in the Spatial Pyramid Pooling-Fast (SPPF) layer of the feature extraction backbone network, the algorithm enhances the image feature representation and perception capabilities. A weighted Bidirectional Feature Pyramid Network (BiFPN) is incorporated in the neck network for reconstruction to improve the multi-scale feature fusion effect. Additionally, an improved Wise-IoU loss function is adopted to accelerate the model's convergence speed and enhance its robustness in complex scenarios. Experimental results show that the improved model achieves precision, recall, and average detection precision of 85.7%, 76.8%, and 81.7% respectively on the MS-COCO2017 human key point dataset, representing significant improvements over the original model. Moreover, it can more accurately and effectively detect key point information of multiple people in complex situations.

, correspAuthors=Bo HU, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Xiantao YIN, Bo HU, Sizhao LI), CN=ArticleExt(id=1251893522446627814, articleId=1251893512128639586, tenantId=1146029695717560320, journalId=1251234473337991274, language=CN, title=基于YOLOv8n-Pose关键点特征增强估计算法, columnId=1251893509079384505, journalTitle=无线电通信技术, columnName=专题:智能通信、存储与信息处理技术前沿, runingTitle=null, highlight=null, articleAbstract=

现有关键点检测算法在光照变化、人员密集交叉遮挡等情况下,易导致检测精度降低、漏检或关键点检测错位的问题。针对该问题,提出基于YOLOv8n-Pose改进的LBW-YOLOv8n-Pose复杂环境多人人体姿态估计算法。通过在特征提取主干网络的快速空间金字塔池化(Spatial Pyramid Pooling-Fast,SPPF)层引入大核可分离注意力(Large Separable Kernel Attention,LSKA),增强图像特征表达能力和感知能力。在颈部网络引入加权双向特征金字塔网络(Bidirectional Feature Pyramid Network,BiFPN)进行重构,提高多尺度特征融合效果,并采用改进的Wise-IoU损失函数,提升模型收敛速度与复杂场景下的鲁棒性。实验结果表明,改进后模型在MS-COCO2017人体关键点数据集上精确率、召回率、平均精度值分别达到85.7%、76.8%、81.7%,相比原模型均有明显提升,且能更精准、有效地检测复杂情况下多人人体关键点信息。

, correspAuthors=胡波, authorNote=null, correspAuthorsNote=
胡波 男,(1980—),硕士,副教授。主要研究方向:嵌入式系统、AI、模糊系统。
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殷贤涛 男,(1998—),硕士研究生。主要研究方向:嵌入式系统、AI。

李思照 男,(1982—),博士,副教授。主要研究方向:AI芯片、新型存储架构。

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殷贤涛 男,(1998—),硕士研究生。主要研究方向:嵌入式系统、AI。

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殷贤涛 男,(1998—),硕士研究生。主要研究方向:嵌入式系统、AI。

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李思照 男,(1982—),博士,副教授。主要研究方向:AI芯片、新型存储架构。

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李思照 男,(1982—),博士,副教授。主要研究方向:AI芯片、新型存储架构。

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Experimental environment

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名称配置
操作系统Windows 10
内存/GB767
CPUIntel(R)Xeon(R)Gold 6342
GPUNVIDIA RTX A6000(47 GB)
开发环境PyTorch 1.10.1,CUDA 11.3
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实验环境

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名称配置
操作系统Windows 10
内存/GB767
CPUIntel(R)Xeon(R)Gold 6342
GPUNVIDIA RTX A6000(47 GB)
开发环境PyTorch 1.10.1,CUDA 11.3
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Comparison of ablation experiment results

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实验SPPF-LSKABiFPNWise-IoUP/%R/%mAP@0.5/%mAP@0.5:0.95/%Params/M
1×××83.874.179.549.23.3
2××85.274.480.149.93.5
3×84.675.381.350.94.0
485.776.881.751.14.0
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消融实验结果对比

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实验SPPF-LSKABiFPNWise-IoUP/%R/%mAP@0.5/%mAP@0.5:0.95/%Params/M
1×××83.874.179.549.23.3
2××85.274.480.149.93.5
3×84.675.381.350.94.0
485.776.881.751.14.0
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Comparative experiment of feature extraction backbone network

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模型Params/MP/%R/%mAP@0.5/%*mAP@0.5:0.95/%GFLOPs
YOLOv8n-Pose3.383.974.079.349.39.3
YOLOv8n-StarNet-Pose2.582.972.978.147.07.6
YOLOv8n-FastNet-Pose4.484.076.080.750.111.8
YOLOv8n-FocalModulation-Pose3.484.274.579.950.09.4
YOLOv8n-AFI-Pose3.284.874.280.249.69.2
YOLOv8n-Pose+SPPF_LSKA3.585.274.480.449.99.5
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特征提取骨干网络对比实验

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模型Params/MP/%R/%mAP@0.5/%*mAP@0.5:0.95/%GFLOPs
YOLOv8n-Pose3.383.974.079.349.39.3
YOLOv8n-StarNet-Pose2.582.972.978.147.07.6
YOLOv8n-FastNet-Pose4.484.076.080.750.111.8
YOLOv8n-FocalModulation-Pose3.484.274.579.950.09.4
YOLOv8n-AFI-Pose3.284.874.280.249.69.2
YOLOv8n-Pose+SPPF_LSKA3.585.274.480.449.99.5
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Comparison experiment of feature fusion networks

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模型P/%R/%mAP@0.5/%mAP@0.5:0.95/%Params/M权重/M
SlimNeck[36]82.773.778.146.43.16.5
RepGFPN[37]83.874.079.649.03.57.5
EfficientRepBiPAN[38]82.173.678.247.23.06.4
ASF[39]82.875.079.649.53.37.0
BiFPN83.676.181.150.93.77.8
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特征融合网络对比实验

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模型P/%R/%mAP@0.5/%mAP@0.5:0.95/%Params/M权重/M
SlimNeck[36]82.773.778.146.43.16.5
RepGFPN[37]83.874.079.649.03.57.5
EfficientRepBiPAN[38]82.173.678.247.23.06.4
ASF[39]82.875.079.649.53.37.0
BiFPN83.676.181.150.93.77.8
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Comparative experiments of mainstream models

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模型图像大小/piexlParams/MmAP@0.5/%
YOLOv5s6-Pose640×64015.084.3
YOLOx-Pose-tiny416×4166.079.3
YOLOv7-W6-Pose960×96080.094.0
YOLOv8n-Pose640×6403.279.5
本文模型640×6404.081.7
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主流模型对比实验

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模型图像大小/piexlParams/MmAP@0.5/%
YOLOv5s6-Pose640×64015.084.3
YOLOx-Pose-tiny416×4166.079.3
YOLOv7-W6-Pose960×96080.094.0
YOLOv8n-Pose640×6403.279.5
本文模型640×6404.081.7
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Model generalization experiment

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模型PRmAP@0.5mAP@0.5:0.95
YOLOv8n-Pose85.380.083.846.4
YOLOv11n-Pose85.080.083.845.9
YOLOv12n-Pose84.579.082.343.9
本文模型85.281.684.447.3
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模型泛化实验

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模型PRmAP@0.5mAP@0.5:0.95
YOLOv8n-Pose85.380.083.846.4
YOLOv11n-Pose85.080.083.845.9
YOLOv12n-Pose84.579.082.343.9
本文模型85.281.684.447.3
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基于YOLOv8n-Pose关键点特征增强估计算法
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殷贤涛 1 , 胡波 1, * , 李思照 2
无线电通信技术 | 专题:智能通信、存储与信息处理技术前沿 2025,51(5): 1025-1035
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无线电通信技术 | 专题:智能通信、存储与信息处理技术前沿 2025, 51(5): 1025-1035
基于YOLOv8n-Pose关键点特征增强估计算法
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殷贤涛1, 胡波1, *, 李思照2
作者信息
  • 1.贵州师范大学 大数据与计算机科学学院,贵州 贵阳 550025
  • 2.哈尔滨工程大学 计算机科学与技术学院,黑龙江 哈尔滨 150001
  • 殷贤涛 男,(1998—),硕士研究生。主要研究方向:嵌入式系统、AI。

    李思照 男,(1982—),博士,副教授。主要研究方向:AI芯片、新型存储架构。

通讯作者:

胡波 男,(1980—),硕士,副教授。主要研究方向:嵌入式系统、AI、模糊系统。
Enhanced Estimation Algorithm Based on YOLOv8n-Pose Key Point Features
Xiantao YIN1, Bo HU1, *, Sizhao LI2
Affiliations
  • 1.School of Big Data and Computer Science, Guizhou Normal University, Guiyang 550025, China
  • 2.College of Computer Science and Technology, Harbin Engineering University, Harbin 150001, China
出版时间: 2025-09-18 doi: 10.3969/j.issn.1003-3114.2025.05.015
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现有关键点检测算法在光照变化、人员密集交叉遮挡等情况下,易导致检测精度降低、漏检或关键点检测错位的问题。针对该问题,提出基于YOLOv8n-Pose改进的LBW-YOLOv8n-Pose复杂环境多人人体姿态估计算法。通过在特征提取主干网络的快速空间金字塔池化(Spatial Pyramid Pooling-Fast,SPPF)层引入大核可分离注意力(Large Separable Kernel Attention,LSKA),增强图像特征表达能力和感知能力。在颈部网络引入加权双向特征金字塔网络(Bidirectional Feature Pyramid Network,BiFPN)进行重构,提高多尺度特征融合效果,并采用改进的Wise-IoU损失函数,提升模型收敛速度与复杂场景下的鲁棒性。实验结果表明,改进后模型在MS-COCO2017人体关键点数据集上精确率、召回率、平均精度值分别达到85.7%、76.8%、81.7%,相比原模型均有明显提升,且能更精准、有效地检测复杂情况下多人人体关键点信息。

姿态估计  /  注意力机制  /  YOLOv8n-Pose

Existing key point detection algorithms tend to suffer from reduced detection precision, missed detections, or misaligned key points in scenarios with varying lighting conditions and dense crowds with overlapping figures. To address this issue, an improved LBW-YOLOv8n-Pose algorithm for multi-person pose estimation in complex environments is proposed based on YOLOv8n-Pose. By introducing the Large Separable Kernel Attention (LSKA) in the Spatial Pyramid Pooling-Fast (SPPF) layer of the feature extraction backbone network, the algorithm enhances the image feature representation and perception capabilities. A weighted Bidirectional Feature Pyramid Network (BiFPN) is incorporated in the neck network for reconstruction to improve the multi-scale feature fusion effect. Additionally, an improved Wise-IoU loss function is adopted to accelerate the model's convergence speed and enhance its robustness in complex scenarios. Experimental results show that the improved model achieves precision, recall, and average detection precision of 85.7%, 76.8%, and 81.7% respectively on the MS-COCO2017 human key point dataset, representing significant improvements over the original model. Moreover, it can more accurately and effectively detect key point information of multiple people in complex situations.

pose estimation  /  attention mechanism  /  YOLOv8n-Pose
殷贤涛, 胡波, 李思照. 基于YOLOv8n-Pose关键点特征增强估计算法. 无线电通信技术, 2025 , 51 (5) : 1025 -1035 . DOI: 10.3969/j.issn.1003-3114.2025.05.015
Xiantao YIN, Bo HU, Sizhao LI. Enhanced Estimation Algorithm Based on YOLOv8n-Pose Key Point Features[J]. Radio Communications Technology, 2025 , 51 (5) : 1025 -1035 . DOI: 10.3969/j.issn.1003-3114.2025.05.015
近年来,得益于深度学习的快速发展,各类高效的特征提取与特征融合网络不断被提出与创新,使姿态估计算法在准确性和效率方面均取得了显著进展[1]。二维姿态估计算法可以分为单人姿态估计算法与多人姿态估计算法。Toshev等[2]在2014年首次提出了单人姿态估计DeepPose算法,该算法是首个将深度神经网络应用于人体关键点检测的算法框架,但其检测效率低,计算复杂度高。多人姿态估计算法主要分为自顶向下与自底向上2种方法。
自底向上的方法主要先通过检测图像中所有的关键点,将关节点进行分组判断,再构建人体骨架,主要有OpenPose[3]、HigherHRNet[4]等算法。该方法的优点是计算量不会随着图像中人物的增加而增大,效率高,缺点是在关节点密集分布的场景中,由于相邻节点间几何特征相似度高且空间耦合性强,导致准确区分和关联各关节点具有较高难度,易引发局部节点空间位置误判或拓扑结构错位现象。
自顶向下的方法主要先检测出图像中的每个人物边界框,再对每个人物对象进行单独的姿态估计,主要有Alphapose[5]算法,该算法可以灵活地使用各种目标检测算法检测人体边界框,常见的检测算法如Faster R-CNN[6]、SSD[7]、YOLO[8]系列算法,其优点在于检测精度高,每个关节点在边框内进行检测,不会出现分组错误问题,缺点在于该算法属于两阶段算法,严重依赖第一阶段的目标检测算法,当出现复杂多人物场景时,计算量随着检测人物的增加而增加且训练较为繁琐,需要单独的训练目标检测模型与姿态估计模型,无法进行端到端的训练与优化[9]。闻举等[10]采用AlphaPose算法结合YOLOX目标检测模型进行打太极关键点检测研究,该方法属于两阶段算法,虽然实现了模型轻量化,但参数量(Params)与计算量仍存在较大优化空间。Maji等[11]首次提出YOLO-Pose算法,该算法集成目标检测与姿态估计算法,可实现端到端的训练与优化,且结合了自顶向下与自底向上方法的优点,该方法不需要后续自底向上分组操作,但该方法的Params、时间复杂度仍存在较大优化空间,存在复杂环境下关键点空间位置易错位、边缘设备应用部署受限等缺点。Ultr alytics团队发布的YOLOv8n-Pose模型,虽然在关键点检测方面进行过优化,但在复杂的人物目标关键点检测场景中仍存在漏检或关键点错位问题。提出基于YOLOv8n-Pose单阶段多人姿态检测算法,通过高效的注意力机制、充分的特征信息融合及优化损失函数,解决在面对复杂多人姿态估计时出现的计算量大、精度低、漏检、关节点错位等问题。
YOLOv8n-Pose基于YOLOv8n模型,该模型适用于目标检测、图像分类、实例分割等任务,主要研究基于该模型的姿态检测模型YOLOv8n-Pose,具有体积小、速度快等优点。该模型结构主要包括输入层、主干网络、颈部网络以及检测头网络。输入部分对图像进行缩放至640 pixel×640 pixel大小,并对数据进行预处理与数据增强操作。数据增强主要通过对图像进行缩放、色调调整、马赛克增强、随机变换等,增强模型的鲁棒性。主干网络主要对图像进行特征提取;颈部网络采用特征金字塔网络(Feature Pyramid Network,FPN)[12]与路径聚合网络(Path Aggregation Network,PAN)[13]结合的双向特征金字塔网络,实现双向数据流,有效增强了不同特征层的数据融合;检测头部网络利用不同大小的特征图来获取不同大小对象的类别位置信息[14]
本文以YOLOv8n-Pose为基础网络模型,主要进行了如下改进:①首先在主干网络SPPF空间池化金字塔层创新性引入大核可分离注意力机制LSKA,通过扩大感受野并增强长距离空间依赖关系捕捉能力,更加精准聚焦关键姿态区域以抑制背景干扰,增强模型特征提取能力;②在特征融合方面,颈部网络使用双向特征金字塔网络BiFPN构建高效跨尺度特征融合架构,通过加权特征融合方式增强高底层特征信息的交互,提升复杂场景下姿态特征的表达能力;③在损失函数方面优化为Wise-IoU,通过动态调整惩罚因子实现样本优化,结合边界框的尺度与位置信息,使得损失函数不仅关注目标重叠区域,还能对尺度不一、中心偏移问题进行优化,提升关键点定位精度,从而有效提高模型关键点检测的准确率。改进的YOLOv8n-Pose网络结构如图1所示。
YOLOv8n-Pose的SPPF空间池化层主要作用减少特征图分辨率,对输入的特征图进行不同尺度的池化操作,并且进行多尺度特征图的融合,提升模型的感知能力与性能[15]。但YOLOv8n-Pose在对多人密集环境时的关节点检测准确率降低,模型主要获取过多的局部信息,缺少全局信息。针对此问题,引入注意力机制方式,提高网络特征提取能力,增强目标关键点检测能力,本文引入基于大核注意力(Large Kernel Attention,LKA)[16],如图2(a)所示;改进的LSKA[17],通过建立长距离依赖关系增强图像特征表达能力和感知能力,且在增强重要特征关注度的同时不会过度增加计算复杂度,有效提高多人密集遮挡场景的关键点检测准确率,如图2(b)所示;改进的SPPF-LSKA结构如图2(c)所示。
与标准的LKA相比,LSKA允许在注意力模块中直接使用具有大核的深度卷积层。LSKA增强了输入图像的远程依赖性,且不会导致大量计算和内存占用。LKA首先采用标准深度卷积来获取图像的局部上下文信息,专注于捕获图像的局部依赖性,更加精细地捕捉图像的细节信息,并缓解规则化网格采样导致的信息丢失问题。之后采用具有较大感受野的可扩展深度卷积来模拟远程依赖,有效捕获全局信息。然后将局部特征与全局特征融合后,输入到1×1的卷积中,以生成注意力图。最后将输出的注意力图与输入特征图作Hadamard乘积,使原始特征图中的每个元素均根据注意力图的值进行加权处理,从而突出重要的特征并抑制不重要的特征信息[18]
LKA具体流程如图2(a)所示,LKA将k×k大卷积核分解为(2d-1)×(2d-1)的标准深度卷积、(k/d)×(k/d)的深度可扩张卷积以及一个1×1卷积,分解原理[17]图3所示。
LSKA结构如图2(b)所示,在LKA的基础上将深度卷积层的2D卷积核分解为级联的水平1D与垂直1D内核,可得到等效LKA结构,并且降低随LKA卷积核尺寸的增加而出现的参数与计算复杂度的二次增长,同时缓解了因大感受野结构带来的局部细节丢失问题。具体而言,LSKA将LKA的(2d-1)×(2d-1)标准深度卷积分解为水平的1×(2d-1)与垂直的(2d-1)×1,再将(k/d)×(k/d)深度可扩张卷积分解为水平1×(k/d)以及垂直的(k/d)×1,最终将分解的卷积进行串联,分解结构如图4所示[19-20]
LSKA的计算如下:
式中:d为膨胀率,表示深度卷积核大小为(2d-1)×(2d-1)的输出,ZC表示深度可扩张卷积核大小为(k/d)×(k/d)的输出,AC表示使用1×1卷积得到的注意力特征图,表示用得到的注意力特征图与原始输入的特征图进行Hadamard乘积。
在原始的SPPF层中,通过对输入特征执行不同程度的空间池化操作来捕获多尺度信息,但在高度复杂背景中捕获空间信息的能力仍显不足,限制了模型整体识别的准确性[21]。LSKA注意力机制使模型聚焦于输入特征的重要部分,本文在SPPF层的Concat之后引入LSKA得到SPPF-LSKA,以便在SPPF完成池化与拼接操作后能够利用LSKA注意力[22]。该融合既保留了SPPF模块对不同大小目标的检测优势,又通过LSKA模块的注意力加权,进一步增强了模型捕捉关键特征的能力。
YOLOv8n-Pose的颈部网络在基于FPN的基础上,引入了一条额外的自底向上的特征融合路径,创新组合形成PANet网络。FPN引入了自顶向下的路径,从而将网络的深层特征信息融合至浅层特征层中,而自底向上的特征融合将浅层特征信息向上融合至更深层特征层中,二者巧妙结合,有效解决了特征信息丢失问题,增强了模型识别细微特征的能力[23]。但对于图像中尺寸较小的人物,其关键点信息检测效果仍存在局限性。
针对该问题,通过引入BiFPN[24]重构颈部层的特征融合网络,网络结构如图5所示。BiFPN网络不仅包含了自顶向下与自底向上的2条特征信息流动路径,而且还进行双向跨尺度链接,增强各网络层的特征信息融合,使特征图拥有更多细节信息与位置信息。此外,BiFPN为了应对不同分辨率下特征图对输出特征的贡献不平等问题,为每个输入特征增加了一个额外的可学习权重,使网络能够学习每个输入特征的重要性[25],且采用快速归一化方法,使权重值处于0~1,提升模型在GPU上的训练速度,计算如下:
式中:O表示融合后的特征输出,WiWj均表示权重值,Ii表示输入特征,ε=0.000 1表示一个较小的常数,用于避免数值不稳定。BiFPN最终融合方式为双向跨尺度连接与快速归一化融合,能够较好地识别小目标及关键点信息。
YOLOv8n-Pose模型损失函数主要包括:①边界框回归损失;②姿态估计损失;③分类损失;④关键点损失。该模型的目标检测任务与关键点检测任务融合在一起,且关键点检测需在目标检测定位的区域内开展,所以关键点检测任务的准确性十分依赖目标检测任务的准确性。YOLOv8n-Pose的边界框回归损失采用CIoU[26]损失函数,CIoU损失函数相较于传统的IoU损失函数,考虑了重叠面积、中心点距离及长宽比,并且该损失函数引入修正因子,增强损失函数对不同形状目标框的鲁棒性。CIoU损失函数如下:
式中:whb分别为预测边界框的宽度、高度、中心点位置,wgthgtbgt分别为真实标注框的宽度、高度、中心点位置,c为真实框与预测框最小外接矩形的对角线长度,v用于衡量长宽比的相似性,α为权重参数[27]。虽然CIoU损失函数相较于IoU在边界框回归中有较好的效果,但参数v仅评价了长宽比的相似性,并不能够准确反映真实标注框与预测框宽度与高度的真实差异,从而导致高质量样本与低质量样本在边界框回归损失不平衡[28]。同时,CIoU需计算预测框与真实框之间的中心距离、宽度、高度和面积的差异,计算复杂且不易优化[29]
为了应对上述CIoU产生的问题,本文使用Wise-IoUv3[30]损失函数换CIoU损失函数,采用注意力函数结合动态非单调聚焦机制(Focusing Mechanism,FM)的策略,该机制使用离群值判断锚框的质量,并根据离群值分配梯度增益。Wise-IoUv3为离群值较大的锚框分配较小的梯度增益,有效防止了低质量样本造成的较大梯度损失,平衡了高质量与低质量样本差异对模型的影响[31],加快了模型收敛速度,提高了人体关键点提取性能。Wise-IoUv3计算如下:
式中:r表示非单调动态聚焦系数,表示离群度,RWIoU表示注意力函数,WgHg分别表示真实框和预测框最小外接矩形的长与宽,WiHi分别表示真实框与预测框相交时的长与宽,表示IoU损失梯度增益,表示训练过程中运行的动态平均值。
本文使用微软发布的MS-COCO2017公共数据集,该数据集包含人体17个关键点的标注,其中用于人体姿态估计的训练图片56 599张,验证集图片2 346张。实验环境如表1所示。
训练参数设置为:训练轮数(epoch)为300,输入图像大小为640 pixel×640 pixel,优化器为SGD,初始学习率为0.01,周期学习率为0.01,线程数为16,批处理大小为64。
本文使用精确率(P)、召回率(R)、平均精度均值(mean Average Precision,mAP)作为模型评价标准。但在姿态估计的评价标准中,并不使用检测框的IoU判断真正例(TP)与伪正例(FP),而是通过计算预测关键点相对于真实关键点位置是否处于合理误差范围内。所使用对象关键点相似度Loks计算为:
式中:i为关键点的序号,为实际与预测关键点位置的欧氏距离,vi为关键点是否可见,s2为检测体所占面积,ki为第i个关键点的归一化因子,δ为脉冲函数,表示仅计算标注的可见关键点。精确率、召回率、平均精度均值计算如下:
式中:TPkpt表示正确识别,且关键点Loks大于设置的阈值;FPkpt表示非关键点区域被错误识别为关键点,且Loks大于设置的阈值;FNkpt(伪反例)表示真实关键点区域被错误识别为非关键点,且Loks小于设置的阈值。
为了验证改进的YOLOv8n-Pose网络中各改进部分的有效性,以YOLOv8n-Pose为基准模型,依次将各改进网络部分加入基准模型中,在同样的数据集下,保持各项参数一致,通过消融实验评估不同改进网络组件对最终模型的影响。消融实验结果如表2所示。
表2中实验1与实验2对比可知,加入改进的SPPF-LSKA网络后,平均精度均值提升1.4个百分点,引入LSKA可有效提高精确率,且在实际效果中,对于紧密复杂的人体骨骼点检测效果优于原始模型。实验2与实验3结果表明,引入BiF-PN特征融合网络后,模型召回率提升0.9个百分点,较基准模型提升1.2个百分点,mAP@0.5与mAP@0.5:0.95较基准模型分别提升1.8个百分点、1.7个百分点。
实验4结果显示,引入Wise-IoU损失函数后,精确率、召回率及平均精度均值均有提升。实验数据如图6所示,最终改进模型较基准模型在精确率、召回率、mAP@0.5、mAP@0.5:0.95上分别提升1.9个百分点、2.7个百分点、2.2个百分点、1.9个百分点,Params仅增加0.7 M,最终模型的Params为4 M。
为了突显改进后的特征提取骨干网络的优势,在MS-COCO2017数据集上对常见的骨干网络进行性能对比实验。
以YOLOv8n-Pose作为基准模型,使用改进后的主干网络与StarNet[32]、FastNet[33]、SPPF-FocalModulation[34]、SPPF-AFI[35]主干网络进行对比实验,结果如表3所示。
表3可以看出,改进后的特征提取骨干网络,在Params上仅比原始模型高0.2 M,计算量高0.2 GFLOPs。但在验证集各项指标均高于原始模型,其中精确率高1.3个百分点,召回率高0.4个百分点,mAP@0.5高1.1个百分点。FastNet骨干网络的召回率高于其他骨干网络,但Params与计算量均高于其他模型。对比结果表明,改进后的骨干网络各项参数表现较优。
图7为GradCAM可视化热力图,直观展示了原始模型与融合LSKA注意力机制后的模型检测效果。
图7(b)图7(c)的热力图对比结果可明显看出,无论是室内小目标、关键点遮挡区域,还是人物密集情况,融合LSKA注意力后,能更好地提取特征信息,特别是增强了对小目标的感知能力,提高了模型检测精度。
为了验证所改进的特征融合网络的先进性和有效性,将BiFPN特征融合网络与其他主流的特征融合网络进行对比实验,实验结果如表4所示。可以看出,BiFPN在召回率指标上明显高于其他4种结构,且在mAP@0.5指标上也高于其他4种网络融合结构,相比SlimNeck特征融合网络提升3.0个百分点,表明BiFPN在特征提取与融合能力上更强。BiFPN在Params与权重的对比中,虽高于其他对比模型,但Params与权重都在可接受范围内,综合对比,改进的特征融合网络综合效果较优。
将改进算法与主流算法在相同的验证集进行对比实验,实验数据如表5所示。平均精度均值最高的模型为YOLOv7-W6-Pose,高达94%,但Params远超其他模型,需要更高的算力与存储要求,不适合在资源有限的设备部署;改进模型相比于YOLOv5s6-Pose模型,其Params约为改进模型的4倍,但平均精度均值仅提高了2.6个百分点;改进模型相比于YOLOx-Pose-tiny模型,不仅Params低2 M,且平均精度均值高约2.4个百分点。
为了验证改进后模型的适用性与泛用性,在MPII公开数据集上进行额外实验,该数据集包含更复杂、多变、非常规的姿态动作,标注有16个关键点。训练集含10 306个样本,验证集含4 420个样本,实验训练环境保持一致,实验数据如表6所示。可以看出,改进后的模型在MPII数据集上的精确率、召回率和平均精度均值指标取得较好的结果。其中精确率与基准模型相差无几,但在RmAP@0.5和mAP@0.5:0.95分别提高了1.6、0.6和0.9个百分点。通过一系列实验论证,改进后的模型在不同的数据集依然取得显著的实验效果,充分展现出较强的泛用性与适用性。
在MS-COCO2017数据集上,通过对改进前后的模型进行不同环境的检测效果对比,主要包括人物关节点不清晰、人物密集、人物遮挡等环境。对比检测效果如图8所示,左为原始模型,右为改进模型。
图8(a)中,在人物目标排列相对密集的关节点检测场景,改进模型相比原模型能减少目标漏检;图8(b)检测效果显示,改进模型在关节点被遮挡时也能较好检测出目标关键点;图8(c)中,在小目标及关键点被遮挡的场景,改进模型相比原模型能检测出更多目标及被遮挡的关键点;图8(d)检测效果显示,针对极端姿态动作,原始模型检测出现关键点错位及漏检,改进模型检测效果更优;图8(e)中,针对光线不充足的场景,原始模型出现严重的人物目标漏检,改进模型能检测更多目标,效果更优。图8(f)中,以俯视角度检测目标关键点时,改进模型与原始模型均出现漏检、关键点错位甚至识别错误;图8(g)中,针对人物密集无序且光照不足的情况,改进模型与原始模型均出现严重漏检;图8(h)中,针对大密度人物目标场景,模型识别率均较低,出现严重漏检。
根据上述分析,本文模型在关键点遮挡、光线较暗且目标稀疏、极端姿态动作、人物密集有序的场景相比原模型有更好的检测效果,但在俯视角度检测、光线不足且人物密度大及更大密度人物目标关键点检测方面仍需改进。
针对现有关键点检测模型,在光照变化、人员密集交叉遮挡时存在检测精度降低、节点错位等问题,提出基于YOLOv8n-Pose模型改进的LBW-YOLOv8n-Pose。在SPPF中引入LSKA,能捕捉图像更广泛的上下文特征信息,增强对遮挡关键点的特征提取能力;采用BiFPN重构颈部网络,增强网络跨尺度特征融合能力,充分融合深浅层特征信息,增强模型对多尺度目标的检测与关键点提取能力;在此基础上,创新性应用Wise-IoU边界框损失函数,通过动态调整梯度权重,减少低质量样本产生的有害梯度,有效提升在复杂环境下的泛化能力与检测鲁棒性。实验结果表明,改进模型在MS-COCO2017关键点数据集上各项指标均有提升,且模型大小仅4 M。尤其在关节点不清晰、人物密集、光线不足、遮挡环境下,改进模型检测效果较好,但在更大密度目标检测方面仍有较大改进空间。未来可结合时空图卷积开展人物动作识别研究,并应用于其他关键点检测领域。
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doi: 10.3969/j.issn.1003-3114.2025.05.015
  • 接收时间:2025-05-13
  • 首发时间:2026-04-17
  • 出版时间:2025-09-18
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    1.贵州师范大学 大数据与计算机科学学院,贵州 贵阳 550025
    2.哈尔滨工程大学 计算机科学与技术学院,黑龙江 哈尔滨 150001

通讯作者:

胡波 男,(1980—),硕士,副教授。主要研究方向:嵌入式系统、AI、模糊系统。
参考文献
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https://castjournals.cast.org.cn/joweb/wxdtxjs/CN/10.3969/j.issn.1003-3114.2025.05.015
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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