Article(id=1312006288654037168, tenantId=1146029695717560320, journalId=1311385739772133495, issueId=1311999647825101743, articleNumber=null, orderNo=null, doi=10.6041/j.issn.1000-1298.2025.12.055, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1723219200000, receivedDateStr=2024-08-10, revisedDate=1728748800000, revisedDateStr=2024-10-13, acceptedDate=null, acceptedDateStr=null, onlineDate=1790736275112, onlineDateStr=2026-09-30, pubDate=1766592000000, pubDateStr=2025-12-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790736275112, onlineIssueDateStr=2026-09-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790736275112, creator=13701087609, updateTime=1790736275112, updator=13701087609, issue=Issue{id=1311999647825101743, tenantId=1146029695717560320, journalId=1311385739772133495, year='2025', volume='56', issue='12', pageStart='1', pageEnd='818', issueExtLink='null', onlineDate='null', pubDate='1766592000000', pubDateStr='2025-12-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1790734691815, creator='13701087609', updateTime=1790738411040, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1312015247465083866, tenantId=1146029695717560320, journalId=1311385739772133495, issueId=1311999647825101743, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1312015247465083867, tenantId=1146029695717560320, journalId=1311385739772133495, issueId=1311999647825101743, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=603, endPage=614, ext={EN=ArticleExt(id=1312006288888918193, articleId=1312006288654037168, tenantId=1146029695717560320, journalId=1311385739772133495, language=EN, title=Multi Behavior Detection and Statistical Method for Beef Cattle Based on Local Perception, columnId=1311999800569066336, journalTitle=Transactions of the Chinese Society for Agricultural Machinery, columnName=Agricultural Informatization Engineering, runingTitle=null, highlight=null, articleAbstract=

Given the current research on beef cattle behavior, which mainly focused on basic behavior recognition and lacked local perception of complex behaviors, the identification of fine behaviors under basic behaviors of beef cattle was researched. A multi-behavior detection and statistical method based on YOLO v8 for beef cattle was proposed. Cattle behavior images were collected by cameras to build a comprehensive dataset that included fundamental behaviors such as standing, lying down, feeding, and drinking, as well as fine behaviors like licking, walking, searching, and tail flicking. YOLO v8n-P2 was selected as the basic model to enhance the ability of the model to detect calves; the feature extraction structure of C2F-PPA was designed; the YOLO v8 detection head was improved by interactive strategy, and the TDADH was constructed. MPDIoU loss function was used to address limitations associated with CIoU. Subsequently, statistical analysis of cattle behaviors based on detection results throughout the day was conducted; these results were visually displayed for various occlusion environments. The experimental results showed that the PTPM-YOLO v8n model achieved precision rate of 91.0%, a recall rate of 87.9%, and a mAP@0.5 score of 94.3% in recognizing all eight behaviors tested. Compared with the original model YOLO v8n, the mAP@0.5 of PTPM-YOLO v8n was increased by 3.0 percentage points, and the parameter number was decreased by 21.9%. which identified all behaviors and basic behaviors, the mAP@0.5 was increased by 3.0 and 2.4 percentage points, respectively. The method presented can accurately identify fine behaviors of beef cattle under farming conditions, providing a reference for multi-behavior monitoring of beef cattle.

, authors=Fang WANG1, 2, Xingyu LIU1, 2, Lisheng REN1, 2, Chenfu FU1, 2, Huixuan JIA1, 2, authorsList=Fang WANG, Xingyu LIU, Lisheng REN, Chenfu FU, Huixuan JIA, authorCompany=null, correspAuthors=Lisheng REN, 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, fund=null), CN=ArticleExt(id=1312006295855657178, articleId=1312006288654037168, tenantId=1146029695717560320, journalId=1311385739772133495, language=CN, title=基于局部感知的肉牛多行为检测与统计方法, columnId=1311999800749421410, journalTitle=农业机械学报, columnName=农业信息化工程, runingTitle=null, highlight=null, articleAbstract=

针对目前肉牛行为研究主要集中在基本行为识别,缺乏对复杂行为间的局部感知,本文对肉牛基本行为下的精细行为进行识别研究,提出基于改进YOLO v8的肉牛多行为检测与统计方法。采集肉牛行为图像,构建包括站立、躺卧、进食、饮水等基本行为和回舔、行走、探究、甩尾等精细行为的肉牛行为数据集;选用YOLO v8n-P2作为基础模型,以增强模型对犊牛的检测能力;设计C2f-PPA特征提取结构,捕捉肉牛不同行为间局部特征变化;采用交互策略对YOLO v8检测头改进,构建任务动态对齐检测头TDADH;采用MPDIoU损失函数,解决了CIoU局限性问题。基于检测结果对全天候时间内肉牛行为统计,对不同遮挡环境下统计结果进行图像可视化显示。结果表明,PTPM-YOLO v8模型识别全部(8种)行为的精确率为91.0%,召回率为87.9%,平均精度均值为94.3%。与原模型YOLO v8n相比,PTPM-YOLO v8n的mAP@0.5提高3.0个百分点,参数量降低23.3%;识别全部行为和基本行为的mAP@0.5分别提升3.0、2.4个百分点。本文实现了养殖环境下肉牛精细行为准确识别,可为肉牛多行为监测提供参考。

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王芳(1971—),女,教授,博士,主要从事从事计算机网络与智能信息处理、农业信息化研究,E-mail:

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任力生(1971—),男,教授,主要从事电子系统设计和物联网技术研究,E-mail:
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Cattle behavior recognition criteria

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行为类别行为描述标签
站立四肢蹄部立于地面,头部无特性动作Stand
躺卧四肢弯曲且腹部全部贴于地面Lying
进食站立的同时,牛只头部伸入食槽或进食栅栏Feed
饮水站立的同时,牛只头部俯身或低头伸入水槽Drinking
回舔牛只回转头部同时,舔舐腹部皮肤Lick back
行走蹄部抬起不处于同一水平线,四肢交叉且头未与地面接触Walk
探究牛只头部靠近地面或与地面接触,头靠近墙或栏杆Search
甩尾牛尾非自然下垂,向左、向右或向上甩Tail flick
), ArticleFig(id=1312006302491046178, tenantId=1146029695717560320, journalId=1311385739772133495, articleId=1312006288654037168, language=CN, label=表1, caption=

肉牛行为判定标准

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行为类别行为描述标签
站立四肢蹄部立于地面,头部无特性动作Stand
躺卧四肢弯曲且腹部全部贴于地面Lying
进食站立的同时,牛只头部伸入食槽或进食栅栏Feed
饮水站立的同时,牛只头部俯身或低头伸入水槽Drinking
回舔牛只回转头部同时,舔舐腹部皮肤Lick back
行走蹄部抬起不处于同一水平线,四肢交叉且头未与地面接触Walk
探究牛只头部靠近地面或与地面接触,头靠近墙或栏杆Search
甩尾牛尾非自然下垂,向左、向右或向上甩Tail flick
), ArticleFig(id=1312006302579126563, tenantId=1146029695717560320, journalId=1311385739772133495, articleId=1312006288654037168, language=EN, label=Tab. 2, caption=

Comparison test before and after data expansion

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行为类别原始数据集数据扩充后数据集
基本行为站立92.093.6
躺卧96.695.9
进食96.095.3
饮水89.194.2
精细行为回舔82.889.4
行走82.688.5
探究83.188.7
甩尾80.485.0
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数据扩充前后对比试验

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行为类别原始数据集数据扩充后数据集
基本行为站立92.093.6
躺卧96.695.9
进食96.095.3
饮水89.194.2
精细行为回舔82.889.4
行走82.688.5
探究83.188.7
甩尾80.485.0
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Performance comparison of different IoU loss

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损失函数mAP@0.5/%
CIoU91.3
DIoU92.5
EIoU92.5
SIoU92.3
MPDIoU92.7
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不同IoU损失模型性能对比

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损失函数mAP@0.5/%
CIoU91.3
DIoU92.5
EIoU92.5
SIoU92.3
MPDIoU92.7
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Results of ablation experiment

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YOLO v8nP2C2f-PPATDADHMPDIoU准确率/%召回率/%mAP@0.5/%参数量浮点计算量帧率/(f·s-1)
√91.382.391.33.0×1068.1×109156.3
√91.284.592.62.9×1061.2×1010153.8
√√91.584.892.83.4×1069.1×109137.0
√√91.085.593.01.7×1065.2×109179.5
√√91.384.692.63.0×1068.1×109163.9
√√√90.987.593.81.8×1069.8×109144.9
√√√√91.887.494.12.3×1061.2×1010140.8
√√√√√91.087.994.32.3×1061.2×1010148.9
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消融试验结果

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YOLO v8nP2C2f-PPATDADHMPDIoU准确率/%召回率/%mAP@0.5/%参数量浮点计算量帧率/(f·s-1)
√91.382.391.33.0×1068.1×109156.3
√91.284.592.62.9×1061.2×1010153.8
√√91.584.892.83.4×1069.1×109137.0
√√91.085.593.01.7×1065.2×109179.5
√√91.384.692.63.0×1068.1×109163.9
√√√90.987.593.81.8×1069.8×109144.9
√√√√91.887.494.12.3×1061.2×1010140.8
√√√√√91.087.994.32.3×1061.2×1010148.9
), ArticleFig(id=1312006304634335529, tenantId=1146029695717560320, journalId=1311385739772133495, articleId=1312006288654037168, language=EN, label=Tab. 5, caption=

Comparison of recognition effect of different behavior categories

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模型基本行为全部行为
YOLO v8n93.491.3
PTPM-YOLO v8n95.894.3
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不同行为种类识别效果对比

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模型基本行为全部行为
YOLO v8n93.491.3
PTPM-YOLO v8n95.894.3
), ArticleFig(id=1312006304768553259, tenantId=1146029695717560320, journalId=1311385739772133495, articleId=1312006288654037168, language=EN, label=Tab. 6, caption=

Result of different behavior recognition

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行为类别精确率召回率mAP@0.5
站立91.792.996.6
躺卧97.696.198.2
进食94.292.397.4
饮水92.291.396.5
回舔87.786.591.9
行走89.680.591.7
探究88.382.291.7
甩尾86.581.390.2
全部行为91.087.994.3
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不同行为识别结果

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行为类别精确率召回率mAP@0.5
站立91.792.996.6
躺卧97.696.198.2
进食94.292.397.4
饮水92.291.396.5
回舔87.786.591.9
行走89.680.591.7
探究88.382.291.7
甩尾86.581.390.2
全部行为91.087.994.3
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Different model experiment results

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模型精确率/%召回率/%mAP@0.5/%参数量浮点计算量帧率/(f·s-1)
Faster R-CNN90.288.189.74.3×1072.13×101146.0
RT-DETR90.485.987.84.2×1071.26×101151.6
YOLO v3-tiny89.982.490.11.2×1071.90×1010217.4
YOLO v5n90.481.390.52.5×1067.10×109147.1
YOLO v7-tiny90.183.190.76.0×1061.30×101074.6
YOLO v8n91.382.391.33.0×1068.10×109156.3
YOLO v9t87.880.589.42.0×1067.60×10991.7
YOLO v10n87.480.888.72.7×1068.20×109142.9
PTPM-YOLO v8n91.087.994.32.3×1061.20×1010148.9
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不同模型试验结果

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模型精确率/%召回率/%mAP@0.5/%参数量浮点计算量帧率/(f·s-1)
Faster R-CNN90.288.189.74.3×1072.13×101146.0
RT-DETR90.485.987.84.2×1071.26×101151.6
YOLO v3-tiny89.982.490.11.2×1071.90×1010217.4
YOLO v5n90.481.390.52.5×1067.10×109147.1
YOLO v7-tiny90.183.190.76.0×1061.30×101074.6
YOLO v8n91.382.391.33.0×1068.10×109156.3
YOLO v9t87.880.589.42.0×1067.60×10991.7
YOLO v10n87.480.888.72.7×1068.20×109142.9
PTPM-YOLO v8n91.087.994.32.3×1061.20×1010148.9
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基于局部感知的肉牛多行为检测与统计方法
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王芳 1, 2 , 刘星宇 1, 2 , 任力生 1, 2 , 付辰伏 1, 2 , 贾惠煊 1, 2
农业机械学报 | 农业信息化工程 2025,56(12): 603-614
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农业机械学报 |农业信息化工程 2025 , 56 (12) : 603 -614
基于局部感知的肉牛多行为检测与统计方法
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王芳(1971—),女,教授,博士,主要从事从事计算机网络与智能信息处理、农业信息化研究,E-mail:

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王芳(1971—),女,教授,博士,主要从事从事计算机网络与智能信息处理、农业信息化研究,E-mail:

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王芳1, 2 , 刘星宇1, 2, 任力生1, 2 , 付辰伏1, 2, 贾惠煊1, 2
作者信息
  • 1.河北农业大学信息科学与技术学院,保定 071001
  • 2.河北省农业大数据重点实验室,保定 071001
通讯作者:
任力生(1971—),男,教授,主要从事电子系统设计和物联网技术研究,E-mail:
作者简介:

王芳(1971—),女,教授,博士,主要从事从事计算机网络与智能信息处理、农业信息化研究,E-mail:

Multi Behavior Detection and Statistical Method for Beef Cattle Based on Local Perception
Fang WANG1, 2 , Xingyu LIU1, 2, Lisheng REN1, 2 , Chenfu FU1, 2, Huixuan JIA1, 2
Affiliations
  • 1.College of Information Science and Technology, Hebei Agricultural University, Baoding 071001, China
  • 2.Key Laboratory of Agricultural Big Data of Hebei Province, Baoding 071001, China
出版时间: 2025-12-25 doi: 10.6041/j.issn.1000-1298.2025.12.055
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针对目前肉牛行为研究主要集中在基本行为识别,缺乏对复杂行为间的局部感知,本文对肉牛基本行为下的精细行为进行识别研究,提出基于改进YOLO v8的肉牛多行为检测与统计方法。采集肉牛行为图像,构建包括站立、躺卧、进食、饮水等基本行为和回舔、行走、探究、甩尾等精细行为的肉牛行为数据集;选用YOLO v8n-P2作为基础模型,以增强模型对犊牛的检测能力;设计C2f-PPA特征提取结构,捕捉肉牛不同行为间局部特征变化;采用交互策略对YOLO v8检测头改进,构建任务动态对齐检测头TDADH;采用MPDIoU损失函数,解决了CIoU局限性问题。基于检测结果对全天候时间内肉牛行为统计,对不同遮挡环境下统计结果进行图像可视化显示。结果表明,PTPM-YOLO v8模型识别全部(8种)行为的精确率为91.0%,召回率为87.9%,平均精度均值为94.3%。与原模型YOLO v8n相比,PTPM-YOLO v8n的mAP@0.5提高3.0个百分点,参数量降低23.3%;识别全部行为和基本行为的mAP@0.5分别提升3.0、2.4个百分点。本文实现了养殖环境下肉牛精细行为准确识别,可为肉牛多行为监测提供参考。

肉牛  /  目标检测  /  多行为识别  /  行为统计  /  YOLO v8

Given the current research on beef cattle behavior, which mainly focused on basic behavior recognition and lacked local perception of complex behaviors, the identification of fine behaviors under basic behaviors of beef cattle was researched. A multi-behavior detection and statistical method based on YOLO v8 for beef cattle was proposed. Cattle behavior images were collected by cameras to build a comprehensive dataset that included fundamental behaviors such as standing, lying down, feeding, and drinking, as well as fine behaviors like licking, walking, searching, and tail flicking. YOLO v8n-P2 was selected as the basic model to enhance the ability of the model to detect calves; the feature extraction structure of C2F-PPA was designed; the YOLO v8 detection head was improved by interactive strategy, and the TDADH was constructed. MPDIoU loss function was used to address limitations associated with CIoU. Subsequently, statistical analysis of cattle behaviors based on detection results throughout the day was conducted; these results were visually displayed for various occlusion environments. The experimental results showed that the PTPM-YOLO v8n model achieved precision rate of 91.0%, a recall rate of 87.9%, and a mAP@0.5 score of 94.3% in recognizing all eight behaviors tested. Compared with the original model YOLO v8n, the mAP@0.5 of PTPM-YOLO v8n was increased by 3.0 percentage points, and the parameter number was decreased by 21.9%. which identified all behaviors and basic behaviors, the mAP@0.5 was increased by 3.0 and 2.4 percentage points, respectively. The method presented can accurately identify fine behaviors of beef cattle under farming conditions, providing a reference for multi-behavior monitoring of beef cattle.

beef cattle  /  object detection  /  multi behavior recognition  /  behavioral statistics  /  YOLO v8
王芳, 刘星宇, 任力生, 付辰伏, 贾惠煊. 基于局部感知的肉牛多行为检测与统计方法. 农业机械学报, 2025 , 56 (12) : 603 -614 . DOI: 10.6041/j.issn.1000-1298.2025.12.055
Fang WANG, Xingyu LIU, Lisheng REN, Chenfu FU, Huixuan JIA. Multi Behavior Detection and Statistical Method for Beef Cattle Based on Local Perception[J]. Transactions of the Chinese Society for Agricultural Machinery, 2025 , 56 (12) : 603 -614 . DOI: 10.6041/j.issn.1000-1298.2025.12.055
牛肉作为我国畜牧业最大产出之一,提高牛肉产量和品质是当前养殖业的重点[1-2]。肉牛健康程度直接影响其数量和肉质,可通过识别肉牛行为判断[3],如:进食行为反映肉牛饥饿程度、饲料偏好与摄入量,进而关系到肉牛生长发育情况[4];当肉牛感到不适或受到蚊虫叮咬时会频繁甩尾,间接反映牛舍卫生程度[5]。肉牛基本行为主要反映其基本健康状况,而精细行为能够表达肉牛复杂的生理信息并反映牛舍环境状况,因此在牛群管理和畜牧生产中,准确地识别和监测肉牛行为对于保障牛群健康和提高牛舍管理水平至关重要[6]。
目前,为提高肉牛行为识别准确率,有诸多学者将传感器数据[7-9]与深度学习算法相结合,LI等[10]提出结合IMU数据和机器学习算法的框架,实现牛只行为的识别与分类。HOSSEININOORBIN等[11]使用联合时频域表示的传感器数据结合序列深度神经网络进行奶牛行为分类。PENG等[12]提出LSTM-RNN模型,结合产犊前最后3 d的IMU数据,识别奶牛产犊前后的基本行为。但佩戴在肉牛身体上的传感器在肉牛运动过程中易脱落和受到损坏,影响肉牛行为识别。
随着深度学习发展,诸多学者通过视频图像分析提取肉牛行为特征,实现肉牛行为识别[13-16]。WANG等[17]提出了基于YOLO v5的奶牛发情行为检测方法,识别奶牛爬跨行为。张宏鸣等[18]对YOLO v3进行改进,识别肉牛的站立和卧倒行为。LI等[19]基于奶牛骨骼和混合卷积算法识别奶牛行走、站立、躺卧共3种基本行为。付辰伏等[20]提出了基于改进YOLO v8的肉牛行为识别方法,识别肉牛5种基本行为。段青玲等[21]对YOLO v7模型进行优化,有效识别肉牛的爬跨、躺卧、探究、站立、运动、舔砥和互斗7种行为。综上所述,目前基于计算机视觉的牛只行为识别方法[22]较为热门,但大部分学者主要针对牛只站立、躺卧、进食、饮水等基本行为进行识别研究,少有针对探究、甩尾、行走和回舔等精细行为进行识别研究。
针对上述问题,本文提出基于改进YOLO v8的肉牛多行为检测与统计方法,对站立、躺卧、进食、饮水、回舔、行走、探究和甩尾共8种行为进行识别研究,在识别基本行为的基础上,对精细行为进行研究。在YOLO v8n-P2的基础上构建C2f-PPA结构、提出TDADH检测头、替换损失函数为MPDIoU等对YOLO v8进行改进。最后,通过试验验证肉牛多行为识别效果,并基于目标检测结果对不同遮挡环境下的肉牛行为进行统计与图像可视化显示。
选取河北省邢台市新河县某小型养殖牛舍为试验地点,摄像头安装于牛舍西南角的电线杆上,确保拍摄可以覆盖整个牛舍。视频采集时间为2023年4月和10月,期间,由于摄像头安装位置局限性,植物生长致使牛舍围墙处肉牛活动区域受到枝叶遮挡,存在大量草木枝叶遮挡部分肉牛身体现象,因此将所采集视频类型分为无遮挡牛舍场景和遮挡牛舍场景,采集牛舍环境如图1所示。该牛舍共有2处食槽和1处水槽,除图1标识外,另一处食槽位于牛棚下休息区内侧。试验共采集视频99段,其中4月49段,10月50段。
将采集的视频使用视频分帧技术处理成图像,保存格式为jpg。通过人工筛选去除冗余图像,采用LabelImg进行肉牛行为标注。本文在识别肉牛站立、躺卧、进食和饮水4种基本行为的基础上,进一步将细节划分回舔、行走、探究和甩尾4种精细行为。其中甩尾行为比较特殊,会与其他行为同时出现。因此,本文定义甩尾行为标准:当甩尾行为与基本行为同时出现,将其认定为甩尾行为;而当甩尾行为与其他精细行为同时出现时,将该行为标注为其他行为。肉牛行为判定标准与行为示例图如表1和图2所示。
制作完成后的数据集标签共分为8类,但肉牛日常活动中,相较于基本行为,精细行为较少出现。为丰富数据集信息、防止模型过拟合和降低行为类别不平衡带来的影响,通过数据增强技术,采用旋转、镜像、缩放、裁剪、平移等数据增强技术将数据集扩充到8 370幅图像,将数据集按比例7∶2∶1划分训练集、验证集和测试集,其中训练集5 859幅,验证集1 674幅,测试集837幅,构成本文的肉牛行为识别数据集。
YOLO v8有n、s、m、l、x共5种不同参数量的模型(支持目标检测、图像分类和实例分割等多种图像处理任务),以及针对小目标检测的YOLO v8-P2和用于高分辨率图像检测的YOLO v8-P6两个版本。本文采用参数量最小、推理速度较快的YOLO v8n作为肉牛行为识别的基础模型,针对数据集中存在犊牛小目标,选用YOLO v8n-P2作为肉牛行为识别改进的最终模型。
YOLO v8n-P2在YOLO v8n模型基础上添加P2小目标检测层。原YOLO v8n模型中只有3个检测层(P3、P4、P5),检测头输出特征图尺寸分别为80×80×255、40×40×255、20×20×255,对应3组初始化锚框,分别用于检测较小、中等和较大目标。YOLO v8n-P2共4个检测层,P2层的输出特征图尺寸为160×160×255,专门用于检测尺寸为4×4以上的目标。P2检测层在主干网络中只进行2次下采样操作,含有目标信息更为丰富的底层特征信息。颈部网络中自上而下和自下而上得到2个P2层特征与主干网络中同尺度特征进行特征融合,输出特征为3个输入特征的融合结果。在特征金字塔中,P2特征图具有较高分辨率和丰富的细节信息,可以综合利用不同尺度信息,提供更全面和准确的小目标肉牛行为特征表示,进而增强模型对犊牛的检测能力。
针对肉牛多行为识别中视觉局部特征分布特点对YOLO v8网络结构进行改进。首先,针对小目标检测层P2能够增强模型对犊牛的辨识能力,选用YOLO v8n-P2作为试验的基础模型;为增强模型的局部感知能力,采用PPA模块对YOLO v8原C2f结构进行改进,设计C2f-PPA结构;将定位与分类任务交互,构建TDADH检测头;最后使用损失函数MPDIoU替换CIoU,进行损失函数相似性度量优化。改进PTPM-YOLO v8模型结构如图3所示。
虽然肉牛体型较大、行动缓慢且易于识别,但该试验数据集中监控摄像头安装在牛舍的远景位置,距离较远,远景视角下肉牛所占像素较少且与本文识别的精细行为较为相似,不同行为间的区别集中于头部、蹄部和尾部等局部。针对以上问题,使用并行化斑块感知模块[23]替换用于特征提取C2f模块中的Bottleneck模块,构建C2f-PPA结构,增强模型局部感知能力,如图4所示,其中h表示特征图高度,w表示特征图宽度,c表示通道数,p表示补丁大小。
PPA模块采用多分支并行方法,包括局部分支、全局分支和串行卷积分支,每个分支负责提取不同规模和级别的特征。多分支特征提取后,利用一系列高效通道注意力和空间注意力构成的注意力模块进行特征加权整合和自适应特征增强。通过控制斑块参数p大小区别局部分支和全局分支,局部分支从特征张量中提取局部特征,使用较小的感受野和高分辨率特征图,以捕捉肉牛图像中精细行为间的微小变化;全局分支负责提取全局特征,采用较大的感受野和低分辨率特征图,以获取图像中的肉牛整体行为模式和背景信息;串行卷积分支通过多层卷积操作逐步提取和增强特征,并与其他分支特征融合。多分支并行处理不同尺度和级别的特征,确保有效地捕获到肉牛表面复杂花纹信息和行为细节,从而提高肉牛行为检测的准确性。
牛舍养殖环境下,肉牛活动量较大,行为多变,而YOLO v8模型原有头部采用2个并行独立的分支完成定位和分类任务,导致模型无法准确定位肉牛行为。分类任务旨在学习肉牛行为的关键部分特征并区别,而定位任务致力于检测目标时精确定位肉牛整体及其边界。2个任务分开完成,易导致远景视角下肉牛边界框回归与行为类别预测结果不一致,进而影响肉牛行为识别准确度。
受到任务无关目标检测[24]启发,在YOLO v8头部的基础上进行改进,采用交互策略将2个互相独立的分支进行交互处理,提出TDADH检测头,旨在远景视角下提高模型的性能。设计思路:通过Conv模块使用2个3×3卷积核提取肉牛行为特征,得到具有边界框回归和行为类别概率的交互特征。定位分支在任务拆解后引入可变形卷积(DCNv2)[25],使模型关注肉牛行为聚集区域,使用交互特征生成DCNv2所需的调制标量Mask;分类分支在任务拆解后使用交互特征进行动态特征选择。最后,对特征进行动态缩放以应对每个检测头所检测目标尺度不同的挑战。TDADH通过任务对齐结构,从多个卷积层中提取任务交互特征,优化分类和定位任务的协同。其结构如图5所示。
回归损失函数IoU表示预测框和真实框之间的重叠程度。YOLO v8默认使用CIoU作为边界框回归损失函数,通过真实框和边界框的重叠面积、中心距离和长宽比,评估模型的预测框和真实框的不一致程度。但CIoU采用的长宽比是相对值,不适用于肉牛姿态变化的情景以及多行为识别过程中肉牛不同行为间局部特征分布不均的情况。为解决上述问题,本文引入MPDIoU[26]作为损失函数,其为一种新型的基于最小点距离的边界框相似性度量。通过计算预测框和真实框的左上角和右下角点之间的最小距离,可有效地衡量2个宽高比不同矩形的几何相似性。计算公式为
其中
式中
      A、B——2个任意图形
      、——A左上、右下点坐标
      、——B左上、右下点坐标
      d1、d2——A、B左上角点之间欧氏距离、右下角点之间欧氏距离
MPDIoU损失函数简化了2个边界框之间的相似性比较,且综合考虑多种几何特性,提升了边界框定位精度和模型训练效果,可有效应对肉牛体型不一和不同行为间局部特征分布不均带来的挑战。
服务器硬件配置为NVIDIA GeForce RTX 3090显卡,AMD Ryzen 5 7600下6-core处理器,运行内存为64 GB。试验在Windows 10操作系统环境下运行,试验平台为Pycharm,编程语言为Python 3.8,并配置运算平台CUDA 12.1和深度学习框架pytorch 2.2.2。模型训练过程输入分辨率为640像素×640像素的图像,初始学习率均设置为0.01,图像批大小为32,训练迭代次数设置为200。采用精确率(Precision)、召回率(Recall)、平均精度均值(mAP@ 0.5)、参数量、浮点计算量和帧率(Frames per second,FPS)作为肉牛行为识别模型评价指标。
本试验肉牛行为识别任务所需检测的行为较多,存在数据集类别不平衡,通过数据扩充以期降低类别不平衡带来的影响。
为验证数据扩充在降低数据集类别不平衡方面的有效性,对比YOLO v8n在原始数据集和扩充后数据集上的肉牛行为识别结果,如表2所示,数据扩充后,样本数量多的基本行为(站立、躺卧、进食)平均精度均值(mAP@0.5)略微浮动。饮水行为,由于牛舍水槽较小且仅有1个,只能同时容纳1头或2头牛只同时饮水,饮水行为数量较少,扩充后精度进一步提升。同时,样本数量少的精细行为在数据扩充后明显提升。总体来看,与原始数据集相比,数据扩充后全部行为之间的识别精度差异更小。样本数量大的行为平均精度均值轻微浮动,而样本数量少的行为平均精度均值显著提升,缩小了不同行为间的识别效果差距,进而降低了类别不平衡带来的影响。
为验证不同损失函数对模型识别效果的影响,对比常用损失函数(CIoU、DIoU、EIoU、SIoU和MPDIoU)在YOLO v8n收敛后的识别效果,结果如表3所示,采用MPDIoU后模型平均精度均值达到92.7%,较其他损失函数都高,对比YOLO v8n原模型提高1.3个百分点。损失变化过程如图6所示,经过200次迭代,损失变化曲线逐渐趋于稳定,使用CIoU、DIoU、EIoU、SIoU和MPDIoU损失函数模型分别收敛于0.963、0.916、0.995、0.927和0.913,未出现过拟合、欠拟合[27]等现象。采用MPDIoU损失函数不仅收敛速度快,且模型收敛后的边界框损失值较低。证明MPDIoU损失函数提高了模型的训练效果,可以有效应对肉牛体型不同和姿态变化带来的挑战。
为验证本文提出的基于PTPM-YOLO v8n的肉牛行为识别方法的有效性,设计了8组消融试验,使用相同的数据集进行训练,结果如表4所示。
相较于YOLO v8n,添加小目标检测层P2后,平均精度均值提升1.3个百分点,浮点计算量提升至1.2×1010,分析原因是小目标检测层YOLO v8-P2网络结构更为复杂,能够识别远景视角下的肉牛以及牛犊。使用C2f-PPA结构平均精度均值、召回率和精确率均有提升,这表明C2f-PPA结构在一定程度上捕捉到肉牛不同行为特征的微小变化,增强了模型的局部感知能力。融合小目标检测层P2和TDADH检测头后,平均精度均值提高至93.8%,浮点计算量降低至9.8×109,由此证明TDADH检测头不仅能有效降低模型的计算复杂度,而且适用于肉牛多行为识别任务,其通过定位和分类的任务交互,在定位肉牛整体的同时有效区分不同行为间的局部特征。在以上改进基础上,进行MPDIoU损失函数优化,模型平均精度均值最终达到94.3%,参数量为2.3×106,浮点计算量为1.2×1010,帧率为148.9 f/s。本文PTPM-YOLO v8n与原YOLO v8-P2相比,虽然帧率有所降低,但平均精度均值、参数量和浮点计算量均优于YOLO v8-P2。相较于YOLO v8n原模型,PTPM-YOLO v8n平均精度均值提高3.0个百分点。原因是肉牛姿态变化会导致边界框发生形变,不同行为的边界框纵横比不同,如:肉牛回舔时,边界框纵横比变小;肉牛躺卧时,边界框纵横比变大。MPDIoU损失函数在处理肉牛更为复杂的姿态变化时尤为有效。根据试验结果可知,本文模型在肉牛多行为识别任务中,模型精度提高效果明显,可以很好完成远景视角下精细行为较为相似且局部特征分布不均的肉牛多行为识别检测任务。
图7(蓝色圆圈表示检测错误,红色圆圈表示检测正确)为YOLO v8n和PTPM-YOLO v8n在不同遮挡环境下的肉牛行为检测结果。由图7可以看出,无遮挡情况下YOLO v8n易识别错误肉牛行为,如图7b所示,将探究行为识别为站立行为,原因是精细行为的关键识别特征位于头部、蹄部和尾部等局部,不易识别。同样在大量枝叶遮挡严重情况下,YOLO v8n检测性能更低,如图7b所示,将枝叶遮挡部分误判为躺卧肉牛。针对局部感知提出的PTPM-YOLO v8n能够解决YOLO v8n在精细行为识别上的局限性问题,准确识别所有行为(图7c)。
回舔、行走、探究和甩尾4种精细行为均是从站立行为衍生而来,在基本行为数据集基础上构建包含有基本行为与精细行为的全部行为数据集。对比基本行为和全部行为在YOLO v8n和PTPM-YOLO v8n上收敛后的识别结果表现,结果如表5所示。
改进后PTPM-YOLO v8n模型在识别4种基本行为和8种全部行为时,对比原YOLO v8n,mAP@0.5均有提升,表现优异,证明本文模型改进方法泛化能力较强,能够适应不同行为种类数量的肉牛行为识别任务。但YOLO v8n和PTPM-YOLO v8n对4种基本行为的识别结果均高于模型对8种全部行为的识别结果,分析原因为精细行为之间的相似性较高且识别关键特征集中在肉牛局部,模型易混淆。只对肉牛4种基本行为进行识别,无法准确识别肉牛精细行为,不利于观察肉牛更为复杂的健康状态。后期随着PTPM-YOLO v8n模型改进,已缩小了基本行为和复杂行为间的识别差距。
为验证本文模型对8种肉牛行为识别的有效性,将改进模型对站立、躺卧、进食、回舔、饮水、行走、探究和甩尾共8种行为进行识别,结果如表6所示。
由表6可知,本文模型在所有行为中对躺卧行为识别平均精度均值最高(98.2%),其原因为躺卧行为是肉牛趴在地面上,而其余行为均是四蹄立于地面上,此行为与其余行为相似度较低,易于区分。在所有行为中,对甩尾行为识别的平均精度均值最低,原因是甩尾行为较为特殊,易与其他行为同时出现,同一头牛在出现甩尾行为的同时可能伴随其他行为。本文模型对基本行为识别平均精度均值普遍高于精细行为,原因为基本行为特征明显易于区分,而精细行为较为复杂相似且局部特征分别位于头部和蹄部等易重叠位置不易于识别。回舔、行走、探究和甩尾4种精细行为与站立行为较为相似,模型识别容易混淆。本文模型对回舔、行走、探究和甩尾4种行为识别平均精度均值分别为91.9%、91.7%、91.7%和90.2%,虽然本文所提PTPM-YOLO v8n模型对精细行为识别精度略低于基本行为,但全部行为识别平均精度均值皆保持在90%以上,证明本文方法对肉牛行为识别的有效性。
为验证PTPM-YOLO v8n肉牛行为识别效果,分别使用Faster R-CNN[28]、RT-DETR、YOLO v3-tiny[29]、YOLO v5n、YOLO v7-tiny、YOLO v8n、YOLO v9t和YOLO v10n等主流目标检测模型在肉牛行为数据集上进行训练,结果如表7所示。
由表7可知,与两阶段目标检测模型Faster R-CNN和实时目标检测模型RT-DETR相比,YOLO系列目标检测模型在肉牛行为识别任务上不仅识别精度高且较为轻量,说明YOLO系列目标检测模型更适用于本文的肉牛基本行为与精细行为识别任务。与之前版本的YOLO v3-tiny、YOLO v5n和YOLO v7-tiny等YOLO系列目标检测模型相比,PTPM-YOLO v8n平均精度均值分别提升4.2、3.8、3.6个百分点。
对比最新YOLO模型YOLO v9t和YOLO v10n,YOLO v9t参数量最低,仅为2.0×106,YOLO v8n虽然参数量较高,但精确率、召回率、平均精度均值和帧率均高于YOLO v9t和YOLO v10n;在YOLO v8n基础上改进的PTPM-YOLO v8n模型召回率和平均精度均值均最高,分别达到87.9%和94.3%。与原模型YOLO v8n相比,PTPM-YOLO v8n的mAP@0.5提高3个百分点,参数量下降23.3%。结果表明,相较于其他目标检测模型,PTPM-YOLO v8n在肉牛行为数据集上的识别效果最佳,验证了本文模型的优越性。
为了更直观地观察其中C2f-PPA结构在捕捉肉牛不同行为间局部特征变化的作用,本文采用Layer-CAM算法绘制模型添加C2f-PPA结构前后的热力图,对模型识别效果可视化。
由图8可知,仅使用YOLO v8n进行肉牛行为识别任务,热力图大多呈直柱状,特征提取较为分散(图8b左侧蓝色圆圈处);而添加C2f-PPA结构后,热力图可基本勾勒出肉牛躯体形状,且模型提取的特征信息主要聚焦于肉牛四肢与颈部(图8c左侧红色圆圈处)。图8b右侧蓝色圆圈处存在肉牛行为漏检现象,而YOLO v8n-C2f-PPA能基本识别所有肉牛行为,降低了肉牛行为漏检概率,验证了C2f-PPA结构用于捕捉肉牛不同行为间局部特征变化的有效性。
为验证本文提出的PTPM-YOLO v8n肉牛多行为识别方法的实用性,对不同光照情况下的肉牛行为识别效果进行测试。如图9(蓝色圆圈表示误检,红色圆圈表示漏检)所示,RT-DETR、YOLO v7-tiny和YOLO v9t在不同光照条件下会产生重叠框现象,即将同一肉牛行为识别为2种肉牛行为;Faster R-CNN、YOLO v3-tiny、YOLO v5n、YOLO v8n和YOLO v10n易将不同光照条件下的精细行为误检;改进模型PTPM-YOLO v8n在光照不均、昏暗和黑暗3种光照条件下基本能准确识别8种肉牛行为。尤其在黑暗条件下,肉牛行为不易观察且精细行为间区别特征位于局部,PTPM-YOLO v8n仍能识别该环境条件的肉牛行为。表明本文模型能够准确检测肉牛基本行为与精细行为,并且具有较好的识别能力。
为进一步测试PTPM-YOLO v8n在不同视角下的检测性能与泛化能力,使用安装于牛棚内部的摄像头采集近景视角下肉牛行为图像进行测试,并对比不同算法的识别效果,不同光照条件下近景视角肉牛行为识别效果如图10所示。
受摄像头安装位置影响,采集的近景图像中肉牛所占像素较大,相较于远景视角下的识别效果,近景视角下的肉牛行为检测框更大,易被识别,但受栏杆遮挡以及肉牛相互遮挡较为严重,RT-DETR、YOLO v3-tiny、YOLO v5n和YOLO v8n重叠框现象较为严重;Faster R-CNN、YOLO v7-tiny和YOLO v10n误检和漏检较多,不适用于遮挡严重的肉牛多行为检测任务。在牛棚遮阳板影响下,发现牛棚内部光线较暗,摄像头附近装有照明灯,随着时间变化,导致不同光照条件下采集的图像越发明亮。由图10可知,PTPM-YOLO v8n在近景视角下仍能准确识别肉牛基本行为与精细行为,受光照条件与遮挡程度影响较小,模型泛化性较强。
为更好地观察与了解该试验牛舍肉牛日常行为习性,对肉牛行为识别数据进行统计与可视化。首先视频输入,通过PTPM-YOLO v8n模型统计每一帧中的肉牛行为数量,并在视频右上角显示统计结果,如图11所示。其次,设置阶段结果观测。每10 min以饼状图形式输出当前肉牛行为统计结果,如图12a所示。最后汇总全天肉牛行为变化趋势。将之前每2 h统计的结果保留,对牛舍06:00—20:00肉牛行为统计汇总,如图12b所示。
由图11可知,本文模型能够实现无遮挡环境和遮挡环境下的肉牛行为与总体数量统计,进而可以帮助农场主检测牛舍有无肉牛丢失。图12a为牛舍06:00的肉牛行为统计结果,早晨以站立行为居多,受昼夜节律和温度影响,牛群比较活跃。以饼状图形式输出统计结果,可更直观地观察肉牛群体当前阶段主要行为。最后,在图12a结果基础上,进行全天肉牛行为统计。发现进食行为受饲养者发放饲料时间限制,主要集中于早上和傍晚,躺卧行为主要集中于光照强度较高的中午和下午。而其他行为受肉牛主观因素影响较高,数量较少,不易于观察。通过肉牛行为识别结果统计,可更全面地观察肉牛群体全天日常行为,了解肉牛行为习性。
(1)提出了基于改进YOLO v8的肉牛行为检测与统计方法。PTPM-YOLO v8能有效识别站立、躺卧、进食、饮水、回舔、行走、探究、甩尾共8种肉牛行为,试验结果表明,识别精确率、召回率和mAP@0.5分别为91.0%、87.9%和94.3%。与原模型YOLO v8n相比,PTPM-YOLO v8n的mAP@0.5提高3个百分点,参数量下降23.3%。
(2)与Faster R-CNN、RT-DETR、YOLO v3-tiny、YOLO v5n、YOLO v7n、YOLO v9t和YOLO v10n在肉牛行为数据集上的识别效果对比,本文模型的mAP@0.5分别提高4.6、6.5、4.2、3.8、3.6、4.9、5.6个百分点。对比PTPM-YOLO v8n和YOLO v8n在基本行为数据集和全部行为数据集上的识别效果,结果表明,改进模型优于原模型。
(3)基于检测结果进行肉牛行为数量统计并进行图像可视化显示,以更直观方式观察肉牛行为习性。PTPM-YOLO v8n能有效完成肉牛多行为检测与统计任务,识别牛舍环境下的基本行为与精细行为。
  • 河北省省级科技计划项目(19220119D)
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2025年第56卷第12期
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doi: 10.6041/j.issn.1000-1298.2025.12.055
  • 接收时间:2024-08-10
  • 首发时间:2026-09-30
  • 出版时间:2025-12-25
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  • 收稿日期:2024-08-10
  • 修回日期:2024-10-13
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河北省省级科技计划项目(19220119D)
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    1.河北农业大学信息科学与技术学院,保定 071001
    2.河北省农业大数据重点实验室,保定 071001

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任力生(1971—),男,教授,主要从事电子系统设计和物联网技术研究,E-mail:
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
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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