Article(id=1320889126069584390, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320888908896907909, articleNumber=null, orderNo=null, doi=10.13386/j.issn1002-0306.2025040229, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1744905600000, receivedDateStr=2025-04-18, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1792854108587, onlineDateStr=2026-10-24, pubDate=1772294400000, pubDateStr=2026-03-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792854108587, onlineIssueDateStr=2026-10-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792854108587, creator=13701087609, updateTime=1792854108587, updator=13701087609, issue=Issue{id=1320888908896907909, tenantId=1146029695717560320, journalId=1260987677001138203, year='2026', volume='47', issue='5', pageStart='1', pageEnd='503', issueExtLink='null', onlineDate='null', pubDate='1772294400000', pubDateStr='2026-03-01', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792854056809, creator='13701087609', updateTime=1792854056809, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=339, endPage=347, ext={EN=ArticleExt(id=1320889127948632586, articleId=1320889126069584390, tenantId=1146029695717560320, journalId=1260987677001138203, language=EN, title=Defect Recognition of Low-temperature Deposition Food 3D Printing Based on Deep Learning, columnId=1261343843585241413, journalTitle=Science and Technology of Food Industry, columnName=Analysis and Determination, runingTitle=null, highlight=null, articleAbstract=

The low-temperature deposition (LDM) food 3D printing process is easily affected by a combination of multiple factors, such as extrusion temperature, speed, and material rheological properties, leading to various issues such as blockage, excessive extrusion, and interference, affecting the printing quality. To achieve efficient identification of defects, this study developed a visual monitoring platform based on industrial cameras by constructing a multi-category nozzle extrusion defect image dataset, addressing the problems of small defect sizes and insignificant inter-class differences. A dual-channel multi-scale feature extraction network that integrated ResNet and Swin Transformer was proposed, and a multi-scale attention fusion module was introduced to improve recognition accuracy. Experimental results showed that the proposed model could effectively identify various types of extrusion defects, with prediction accuracies of 98.20%, 97.89%, 94.90%, and 97.86% for blockage, excess, granularity, and interference, respectively, and 97.63% for standard extrusion. The average detection time for a single image was 0.2 s. The overall accuracy was 97.53%, and the recall rate was 97.62%, which were 4.11 and 4.00 percentage points higher than those of ResNet34, respectively. This demonstrates excellent recognition performance and real-time capabilities, providing reliable data support for food 3D printing quality control.

, authors=Qiang TONG1, 2, Huangping MA1, Junhao YANG1, Ye BI1, Shuailei XIAO1, Xiuping DONG2, 3, Qingguo MENG4, *, authorsList=Qiang TONG, Huangping MA, Junhao YANG, Ye BI, Shuailei XIAO, Xiuping DONG, Qingguo MENG, authorCompany=null, correspAuthors=Qingguo MENG, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Science and Technology of Food Industry. All rights reserved., 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=1320889132809830949, articleId=1320889126069584390, tenantId=1146029695717560320, journalId=1260987677001138203, language=CN, title=基于深度学习的低温沉积食品3D打印缺陷识别, columnId=1261343846139572559, journalTitle=食品工业科技, columnName=分析检测, runingTitle=null, highlight=null, articleAbstract=

低温沉积(LDM)食品3D打印过程中易受到挤出温度、速度、物料流变性能等多因素耦合影响,导致堵料、过量挤出、干涉等多种缺陷,影响打印质量。为实现对缺陷的高效识别,本文搭建了基于工业相机的视觉监测平台,并构建了多类别喷嘴挤出缺陷图像数据集。针对缺陷尺寸小、类间差异不显著等问题,提出了一种融合ResNet与Swin Transformer的双通道多尺度特征提取网络,并引入多尺度注意力融合模块以提升识别精度。实验结果表明,所提模型能有效识别各类挤出缺陷,对堵料、过量、颗粒状和干涉类别的预测精度分别为98.20%、97.89%、94.90%和97.86%,正常挤出为97.63%;单张图像平均检测时间为0.2 s。整体准确率为97.53%,宏召回率为97.62%,较ResNet34分别提升4.11和4.00个百分点,展现出优异的识别性能与实时性,可为食品3D打印质量控制提供可靠数据支撑。

, authors=童强1, 2, 马黄平1, 杨俊豪1, 毕野1, 肖帅磊1, 董秀萍2, 3, 孟庆国4, *, authorsList=童强, 马黄平, 杨俊豪, 毕野, 肖帅磊, 董秀萍, 孟庆国, authorCompany=null, correspAuthors=孟庆国, authorNote=

童强(1989−),男,博士,讲师,研究方向:水产品复合3D打印关键技术,E-mail:

, correspAuthorsNote=
孟庆国(1985−),男,学士,高级工程师,研究方向:机器视觉与机械自动化技术,E-mail:。
, copyrightStatement=版权所有 © 2026《食品工业科技》编辑部, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=02r3KnN3At0X6n6VvXOIlA==, magXml=iDktcU/0uRR+CeCWJKSg8A==, pdfUrl=null, pdf=7YLtJ+d9BAuimu1w+uEC9A==, pdfFileSize=13700165, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=hmF2BWEyulTXUYrB6eOl4Q==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=N0E+WEtFL3rzHjBlwWwxCw==, mapNumber=null, fund=null)}, authors=[Author(id=1320889133485113907, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=tongqiang.work@outlook.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1320889133568999990, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, authorId=1320889133485113907, language=EN, stringName=Qiang TONG, firstName=Qiang, middleName=null, lastName=TONG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, 2, address=1College of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian 116034, China
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A new calibration method for linear CCD camera[J]. Procedia Engineering, 2010, 7: 290−296., articleTitle=null, refAbstract=null), Reference(id=1320889150228775590, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=27, rfOrder=33, authorNames=null, journalName=null, refType=null, unstructuredReference=QU Jiaxu, YUE Caixu, ZHOU Jiaqi, et al. On-machine detection of face milling cutter damage based on machine vision[J]. 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MobileNets: Efficient convolutional neural networks for mobile vision applications[EB/OL]. 2017: arXiv: 1704.04861. https://arxiv.org/abs/1704.04861., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1320889133061489190, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, xref=1, ext=[AuthorCompanyExt(id=1320889133074072103, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133061489190, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1College of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian 116034, China), AuthorCompanyExt(id=1320889133082460712, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133061489190, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1大连工业大学机械工程与自动化学院,辽宁大连 116034)]), AuthorCompany(id=1320889133157958185, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, xref=2, ext=[AuthorCompanyExt(id=1320889133170541098, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133157958185, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2National Key Laboratory of Marine Food Processing and Safety Control, National Marine Food Engineering Technology Research Center, Liaoning Province Seafood Deep Processing Industry Common Technology Innovation Platform, Dalian City Chinese-Style Premade Food Technology Innovation Center, Dalian 116034, China), AuthorCompanyExt(id=1320889133178929707, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133157958185, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2海洋食品加工与安全控制全国重点实验室,国家海洋食品工程技术研究中心,辽宁省海产品精深加工产业共性技术创新平台,大连市中式预制食品技术创新中心,辽宁大连 116034)]), AuthorCompany(id=1320889133258621484, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, xref=3, ext=[AuthorCompanyExt(id=1320889133267010093, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133258621484, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=3Institute of Food Cross-Science, Dalian Polytechnic University, Dalian 116034, China), AuthorCompanyExt(id=1320889133287981614, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133258621484, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=3大连工业大学食品交叉科学研究院,辽宁大连 116034)]), AuthorCompany(id=1320889133380256303, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, xref=4, ext=[AuthorCompanyExt(id=1320889133397033520, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133380256303, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=4Dalian Changfeng Industrial Corporation, Dalian 116092, China), AuthorCompanyExt(id=1320889133409616433, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, companyId=1320889133380256303, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=4大连长丰实业总公司,辽宁大连 116092)])], figs=[ArticleFig(id=1320889137520034401, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, language=EN, label=Fig.1, caption=LDM equipment diagram, figureFileSmall=fV65WJOrCfd7oq0PQdkckQ==, figureFileBig=hmF2BWEyulTXUYrB6eOl4Q==, tableContent=null), ArticleFig(id=1320889137591337570, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320889126069584390, language=CN, label=图1, caption=LDM设备图

注:(a)LDM设备整体外观;(b)LDM设备挤出打印平台。

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注:(a)为工业相机;(b)为夹具。

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注:(a)正常挤出状态;(b)喷嘴与成型表面干涉;(c)喷嘴堵料;(d)喷嘴过量挤出;(e)颗粒状挤出。

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Core parameters of camera

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参数像元尺寸靶面尺寸分辨率最大帧率传感器
参数值25 mm1/1.8''0.1 m17 fpsCMOS
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工业相机核心参数

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参数像元尺寸靶面尺寸分辨率最大帧率传感器
参数值25 mm1/1.8''0.1 m17 fpsCMOS
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Dual-channel feature extraction network ablation experiments on Swin Transformer module

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模型准确率(%)宏召回率(%)
ResNet1887.2388.10
SWT-ResNet1892.3993.20
ResNet3488.2790.85
SWT-ResNet3493.4293.62
VGG1683.2184.36
SWT-VGG1686.2287.12
VGG1985.6285.41
SWT-VGG1989.2788.44
AlexNet80.3082.16
MobileNet82.4183.22
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关于Swin Transformer模块的双通道特征提取网络消融实验

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模型准确率(%)宏召回率(%)
ResNet1887.2388.10
SWT-ResNet1892.3993.20
ResNet3488.2790.85
SWT-ResNet3493.4293.62
VGG1683.2184.36
SWT-VGG1686.2287.12
VGG1985.6285.41
SWT-VGG1989.2788.44
AlexNet80.3082.16
MobileNet82.4183.22
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Ablation experiments with DCMSFF feature fusion module

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模型准确率(%)宏召回率(%)
SWT-ResNet34-DCMSFF97.5397.62
SWT-ResNet3493.4293.62
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DCMSFF特征融合模块的消融实验

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模型准确率(%)宏召回率(%)
SWT-ResNet34-DCMSFF97.5397.62
SWT-ResNet3493.4293.62
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Classification performance of SWT-ResNet34 model for specific defect types

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类型准确率(%)宏召回率(%)
堵料93.7595.12
过量91.8992.34
颗粒状89.1091.40
干涉96.1094.00
正常94.0493.23
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SWT-ResNet34模型对具体缺陷类型的分类性能

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类型准确率(%)宏召回率(%)
堵料93.7595.12
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颗粒状89.1091.40
干涉96.1094.00
正常94.0493.23
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Classification performance of SWT-ResNet34-DCMSFF model for specific defect types

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类型准确率(%)宏召回率(%)
堵料98.2099.06
过量97.8995.89
颗粒状94.9099.97
干涉97.8696.88
正常97.6396.88
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SWT-ResNet34-DCMSFF模型对具体缺陷类型的分类性能

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基于深度学习的低温沉积食品3D打印缺陷识别
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童强 1, 2 , 马黄平 1 , 杨俊豪 1 , 毕野 1 , 肖帅磊 1 , 董秀萍 2, 3 , 孟庆国 4, *
食品工业科技 | 分析检测 2026,47(5): 339-347
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食品工业科技 |分析检测 2026 , 47 (5) : 339 -347
基于深度学习的低温沉积食品3D打印缺陷识别
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童强1, 2 , 马黄平1, 杨俊豪1, 毕野1, 肖帅磊1, 董秀萍2, 3, 孟庆国4, *
作者信息
  • 1大连工业大学机械工程与自动化学院,辽宁大连 116034
  • 2海洋食品加工与安全控制全国重点实验室,国家海洋食品工程技术研究中心,辽宁省海产品精深加工产业共性技术创新平台,大连市中式预制食品技术创新中心,辽宁大连 116034
  • 3大连工业大学食品交叉科学研究院,辽宁大连 116034
  • 4大连长丰实业总公司,辽宁大连 116092
通讯作者:
孟庆国(1985−),男,学士,高级工程师,研究方向:机器视觉与机械自动化技术,E-mail:。
作者简介:

童强(1989−),男,博士,讲师,研究方向:水产品复合3D打印关键技术,E-mail:

Defect Recognition of Low-temperature Deposition Food 3D Printing Based on Deep Learning
Qiang TONG1, 2 , Huangping MA1, Junhao YANG1, Ye BI1, Shuailei XIAO1, Xiuping DONG2, 3, Qingguo MENG4, *
Affiliations
  • 1College of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian 116034, China
  • 2National Key Laboratory of Marine Food Processing and Safety Control, National Marine Food Engineering Technology Research Center, Liaoning Province Seafood Deep Processing Industry Common Technology Innovation Platform, Dalian City Chinese-Style Premade Food Technology Innovation Center, Dalian 116034, China
  • 3Institute of Food Cross-Science, Dalian Polytechnic University, Dalian 116034, China
  • 4Dalian Changfeng Industrial Corporation, Dalian 116092, China
出版时间: 2026-03-01 doi: 10.13386/j.issn1002-0306.2025040229
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低温沉积(LDM)食品3D打印过程中易受到挤出温度、速度、物料流变性能等多因素耦合影响,导致堵料、过量挤出、干涉等多种缺陷,影响打印质量。为实现对缺陷的高效识别,本文搭建了基于工业相机的视觉监测平台,并构建了多类别喷嘴挤出缺陷图像数据集。针对缺陷尺寸小、类间差异不显著等问题,提出了一种融合ResNet与Swin Transformer的双通道多尺度特征提取网络,并引入多尺度注意力融合模块以提升识别精度。实验结果表明,所提模型能有效识别各类挤出缺陷,对堵料、过量、颗粒状和干涉类别的预测精度分别为98.20%、97.89%、94.90%和97.86%,正常挤出为97.63%;单张图像平均检测时间为0.2 s。整体准确率为97.53%,宏召回率为97.62%,较ResNet34分别提升4.11和4.00个百分点,展现出优异的识别性能与实时性,可为食品3D打印质量控制提供可靠数据支撑。

食品3D打印  /  深度学习  /  过程检测  /  低温沉积  /  缺陷识别

The low-temperature deposition (LDM) food 3D printing process is easily affected by a combination of multiple factors, such as extrusion temperature, speed, and material rheological properties, leading to various issues such as blockage, excessive extrusion, and interference, affecting the printing quality. To achieve efficient identification of defects, this study developed a visual monitoring platform based on industrial cameras by constructing a multi-category nozzle extrusion defect image dataset, addressing the problems of small defect sizes and insignificant inter-class differences. A dual-channel multi-scale feature extraction network that integrated ResNet and Swin Transformer was proposed, and a multi-scale attention fusion module was introduced to improve recognition accuracy. Experimental results showed that the proposed model could effectively identify various types of extrusion defects, with prediction accuracies of 98.20%, 97.89%, 94.90%, and 97.86% for blockage, excess, granularity, and interference, respectively, and 97.63% for standard extrusion. The average detection time for a single image was 0.2 s. The overall accuracy was 97.53%, and the recall rate was 97.62%, which were 4.11 and 4.00 percentage points higher than those of ResNet34, respectively. This demonstrates excellent recognition performance and real-time capabilities, providing reliable data support for food 3D printing quality control.

food 3D printing  /  deep learning  /  process detection  /  low-temperature deposition  /  defect identification
童强, 马黄平, 杨俊豪, 毕野, 肖帅磊, 董秀萍, 孟庆国. 基于深度学习的低温沉积食品3D打印缺陷识别. 食品工业科技, 2026 , 47 (5) : 339 -347 . DOI: 10.13386/j.issn1002-0306.2025040229
Qiang TONG, Huangping MA, Junhao YANG, Ye BI, Shuailei XIAO, Xiuping DONG, Qingguo MENG. Defect Recognition of Low-temperature Deposition Food 3D Printing Based on Deep Learning[J]. Science and Technology of Food Industry, 2026 , 47 (5) : 339 -347 . DOI: 10.13386/j.issn1002-0306.2025040229
当前,中国制造业快速发展,正由“制造大国”向“制造强国”转型,智能制造作为核心方向日益受到重视[1−3]。增材制造(3D打印)作为代表性技术,具备设计灵活、材料利用率高、周期短等优势,被誉为“第三次工业革命”的关键驱动力。挤出沉积式3D打印作为其中的重要分支,广泛应用于生物医学、航空航天、食品等领域,能够实现结构复杂、定制化的高精度制造,展现出巨大的应用潜力与发展前景[4−7]。低温沉积成型(LDM)是挤出式3D打印的一种,通过低温环境控制材料成型,避免高温对食品材料的热降解,适用于明胶[8]、海藻酸盐[9]等热敏性食品材料的打印,具备营养保留、结构可控、个性化定制等优势。
在LDM打印过程中,物料流变性能、设备振动及工艺参数的耦合作用会影响打印稳定性与一致性,易引发堵塞、过量挤出、干涉等缺陷,限制该技术在食品打印领域的推广[10−12]。当前缺陷检测主要依赖人工判断,效率低、误差大,难以实现数据留存与过程溯源。随着机器视觉与深度学习的发展,智能监测逐渐应用于3D打印。如Sun等[13]通过多摄像头系统成像和图像处理来检测3D打印物体中导致物体不完整的缺陷,从而检测打印完成失败缺陷及质量问题。Chia等[14]提出了一种基于视觉的方法,用于实时扫描、过滤、分割和关联物理打印部件与数字3D模型。并通过自动捕获、过滤、分割、重建打印部件的高分辨率点云数据,并与对应的数字3D模型进行比较,实现打印过程的自动监控和错误检测。尽管已有研究在图像分类与分割上取得进展,但仍存在实时性差、小目标识别能力弱、缺陷类型易混淆等问题。如Shi等[15]提出一种轻量卷积神经网络用于缺陷检测,但对颗粒类小缺陷的识别率不足。Zhang等[16]改进了基于YOLOv5的结构模型实现在线监测,虽提升了检测速度,但对类间相似缺陷易产生混淆。此外,智能检测系统在LDM领域的研究仍相对较少。明胶作为一种从动物皮肤和骨骼中提取的天然高分子蛋白质,主要成分为胶原蛋白的水解产物,具有良好的生物相容性、热敏凝胶性和可食性,已被广泛应用于食品3D打印领域[17]。由于其在较低温度下可保持较好的成型流变特性,明胶特别适用于LDM打印工艺,可在保证打印精度的同时实现较高的结构稳定性。因此,本文以食品级明胶为打印材料,设计并搭建了基于机器视觉的LDM打印过程监测系统,实现喷嘴挤出状态的实时识别与模型缺陷的在线检测,为打印质量的过程控制与优化提供了数据支撑和技术保障。
针对上述问题,本文提出一种融合ResNet[18−21]与Swin Transformer[22−25]结构的双通道多尺度特征提取网络,并引入多尺度注意力融合机制,提升模型对小尺寸、类间差异小的缺陷目标的识别能力。在保证检测精度的同时,兼顾了模型的实时性和鲁棒性。通过消融实验验证,该模型在识别准确率和宏召回率方面优于传统CNN模型,更适用于LDM喷嘴缺陷识别任务。
180冻力食品级明胶 河南糖柜有限公司。
本文使用的低温挤出沉积设备由实验室自主设计,主要包括挤出机构、温控系统,如图1所示。本实验所用挤出机构为柱塞式结构。运动控制部分由电机驱动丝杆,推动活塞,实现线性挤出,该执行机构由课题组自制,主要材质为不锈钢。温控系统包括料筒与环境两部分:料筒加热系统由PID温控器、固态继电器、硅胶加热筒及温度传感器构成,保障物料始终处于熔融状态;冷却系统同样采用闭环PID控制,用于调节成型室温度,防止打印过程温差干扰。其详情如图2所示。
监测系统需要的主要硬件设备包括工业相机、镜头、光源、相机夹持设备。工业相机按成像原理分为CCD与CMOS两种。CCD图像质量高、噪声低,但功耗大、传输慢;CMOS功耗低、响应快、成本低,适用于高速成像与实时处理[26−28]。考虑本系统需实时监测喷嘴挤出缺陷,对响应速度要求较高,故选用CMOS相机。CMOS相机高帧率及快速数据处理能力,有助于捕捉高速运动物料并及时反馈缺陷信息。本实验喷嘴直径为0.6 mm,识别精度要求达0.1 mm,检测区域为100 mm×100 mm,需相机成像分辨率不低于3000×3000像素。综上,选用海康威视工业相机MV-CA-060-10GC作为图像采集设备,满足识别精度与处理需求,如图3所示,参数如表1所示。
根据喷嘴挤出状态可分为五类:正常挤出时,物料线条规则、界面清晰,无堆积或流淌,为理想状态;堵料通常由温度或速度设置不当引起,导致物料在料筒内凝胶化附着,阻碍挤出,表现为打印层空洞、表面凹陷;过量挤出由于挤出速度过快,造成物料堆积、流淌,致使成型边缘不规则;颗粒状挤出则因温度过低使物料凝胶化,挤出呈颗粒状,易引发层间分离;喷嘴干涉多因层厚设置过低,喷嘴刮起或被包裹物料,导致成型表面不平整,亦易造成层间分离。其详情如图4所示。
为实现喷嘴挤出缺陷的高效识别与精准分类,本文基于低温沉积建模(LDM)食品3D打印实验平台,通过系统调控挤出温度、打印速度、挤出速度等关键工艺参数,主动诱导形成五类典型喷嘴状态,正常、堵料、过量、颗粒状和喷嘴干涉。数据采集过程中,采用高清工业相机垂直固定于打印区域上方,实时记录喷嘴挤出过程。各类缺陷状态通过典型参数干预实现,首先,使用明胶打印不同尺寸立方体模型。相机及安装位置如图5所示,光源采用条形光源,远端侧向照明,采集区域为喷嘴尖端区域。合理参数配置下获得正常挤出状态(挤出速度0.015~0.03 mm/s,挤出温度为40~50 ℃、打印速度7~10 mm/s),共采集1140张图片;降低温度或提高速度诱发堵料现象,共采集1048张图片;挤出量过大或速度过慢导致过量挤出,共采集978张图片;温度不足造成物料颗粒状挤出,共采集604张图片;层厚设置过小易引发喷嘴干涉,共采集1084张图片。每种状态均通过多次试验反复诱导,确保缺陷样本的代表性与覆盖性,采集结果如图6所示。随后,从采集视频中提取关键帧图像,剔除模糊与无效帧,依据缺陷特征人工标注对应类别,构建涵盖五类喷嘴挤出状态的图像数据集,为后续深度学习模型的训练与验证提供高质量数据支撑。
本文提出的双通道多尺度特征融合网络主要由特征提取网络和多尺度特征融合模块组成,网络的基本框架如图7所示。模型采用ResNet34与Swin Transformer的双通道结构应对生物材料3D打印过程中喷嘴挤出缺陷尺寸微小、类间差异不显著等问题,提升模型对细粒度缺陷特征的提取能力。针对打印过程中典型的微小挤出缺陷(如堵料现象,其主要表现为喷嘴尖端不再挤出物料),由于喷嘴与成型面之间的距离通常为0.1~0.3 mm,喷嘴直径约为0.4 mm,故相关缺陷在图像中的面积占比极小,如图8所示,对特征提取网络的感知能力提出了较高要求。Swin Transformer通过分层窗口注意力机制构建了多尺度渐进式的特征融合路径:在Stage 1阶段采用4×4的细粒度窗口,以捕捉材料表面微小形变特征;在Stage 3阶段扩展至16×16窗口,实现局部拓扑关联建模,用于识别挤出路径中的局部畸变模式;最终在Stage 4阶段通过32×32的宏观窗口进行全局建模,用于检测挤出材料的整体形态异常,从而实现对不同尺度缺陷的统一感知与判别。
模型首先对输入的喷嘴图像进行预处理,包括随机旋转和水平翻转等数据增强。随后,图像输入双通道特征提取网络:ResNet用于提取全局特征,Swin Transformer提取局部特征。提取的特征通过多尺度注意力融合模块进行融合,以提升分类准确率。最后,融合特征输入多层感知机(MLP)实现分类。
ResNet(残差网络)由He等[29]提出,通过引入残差结构,有效缓解了深层网络中的梯度消失问题。其核心思想是利用恒等映射将输入特征直接传递到后续层,实现“跳跃连接”,数学表达如式(1)。这种结构提升了网络的训练效率和深层模型的稳定性。
$\rm \mathrm{y}=\mathcal{F}(\mathrm{x},\left\{{W}_{i}\right\})+\mathrm{x} $
式中:x表示输入特征向量或特征图,$ \mathcal{F}\left(\mathrm{x},\left\{{{\mathrm{W}}}_{{\mathrm{i}}}\right\}\right) $表示残差映射函数,通常由多个卷积层、BatchNorm和激活函数(如 ReLU)组成,其中$ \left\{{{\mathrm{W}}}_{{\mathrm{i}}}\right\} $为这些层的可学习权重参数集合;$ \mathrm{y} $表示该残差块的输出特征,与输入$ \mathrm{x} $具有相同的维度。
Swin Transformer是Liu等[30]提出的一种改进型视觉Transformer架构,旨在解决传统Transformer计算量大、效率低的问题。通过局部窗口内的自注意力计算和滑动窗口机制实现跨窗口信息交互,同时采用分层结构,逐步提取更高层次特征。其基本模块包括归一化层(LN)、窗口自注意力(W-MSA)、偏移窗口注意力(SW-MSA)和多层感知机(MLP)。
在低温沉积环境下采集的喷嘴挤出缺陷图像存在类间差异小、对比度低等问题,导致传统单一特征提取网络难以获得有效特征,分类精度和鲁棒性较差。为此,本文在双通道特征提取网络基础上,设计了一种基于空间通道注意力的多尺度特征融合模块,如图9所示。该模块包含通道注意力(用于增强ResNet提取的全局特征)、空间注意力(用于强化Swin Transformer提取的局部特征)以及空间通道注意力交互模块。通过对全局与局部特征间的关联性建模,实现更有效的特征增强,提升模型的检测能力与鲁棒性。
为评估Swin Transformer模块对双通道特征提取网络的影响,本文设计了以下消融实验:首先,采用常用CNN网络进行缺陷识别,选取性能最优的CNN网络作为全局特征提取通道;其次,将不同CNN网络与Swin Transformer组合,构建双通道特征提取网络,在1.2.2小节制作的喷嘴挤出缺陷数据集上进行测试;最后,通过对比各组合模型在测试集上的准确率和宏召回率,评估单通道CNN网络结构及CNN网络与Swin Transformer组合的优劣,确定最优的特征提取网络结构。双通道网络命名为SWT-CNNs,其中SWT为Swin Transformer简写,CNNs表示具体网络结构。所用CNN包括ResNet、VGG[31]、AlexNet[32]、MobileNet[33]。
在上一小节中不包含DCMSFF的SWT-ResNet34在本文建立的喷嘴挤出缺陷数据集上的表现是最好的,因此本小节选用SWT-ResNet34作为特征提取网络,通过是否在SWT-ResNet34特征提取网络之后添加DCMSFF特征融合模块,验证DCMSFF模块对于提升模型性能的有效性。
本实验在Windows 11操作系统上进行,使用13th Gen Intel Core i7-13620H CPU(2.40 GHz)和NVIDIA RTX 4050 8GB GPU。编程环境为PyCharm 2022,深度学习框架为PyTorch 2.4.0,编程语言为Python 3.10.13。训练中,采用图像增强方法,数据集按7:2:1比例划分为训练集、验证集和测试集。训练轮数为50,批次大小为16,损失函数为交叉熵,优化器为Adam,初始学习率为0.001。
为评估缺陷识别模型在喷嘴挤出缺陷识别方面的准确性,本文选取了以下分类性能指标:宏召回率(Recall,R)、准确率(Accuracy)。各指标的具体计算公式如下。
召回率R反映的是在进行挤出缺陷分类时,在实际为正例的样本中,被模型正确预测为正例的比例。TP(True Positive,真阳性),实际为正例(比如“存在缺陷”),且模型预测为正例的样本数量。FN(False Negative,假阴性),实际为正例,但模型错误预测为负例(比如“漏检了缺陷”)的样本数量。
$ \text{R}=\frac{\text{TP}}{\mathrm{TP}+\text{FN}} $
Macro-Recall为宏召回率,通过计算每个类别的召回率R,然后对所有类别的召回率进行平均,可以提供对分类模型的全面评估。i代表第i个类别,n为类别总数。
$\rm \mathrm{Macro}\_ \mathrm{R}=\frac{1}{n}\sum \limits_{i=1}^{n}\,{R}_{{{i}}} $
准确率(Accuracy)用来计算正确预测的样本数占所有样本总数的比例。如式(4)所示。TN(True Negative,真阴性),实际为负例(比如“无缺陷”),且模型预测为负例的样本数量。FP(False Positive,假阳性),实际为负例,但模型错误预测为正例(比如“误判出不存在的缺陷”)的样本数量。
$ \mathrm{Accuracy}=\frac{\mathrm{TP}+\text{TN}}{\mathrm{TP}+\mathrm{TN}+\mathrm{FP}+\text{FN}} $
根据常见缺陷类型,实验将缺陷图像划分为5个类别(如图10所示)。为提升分类性能并降低计算资源消耗,采集到的图像以喷嘴为中心裁剪为224×224尺寸,以突出喷嘴区域、减少背景干扰,从而增强模型对缺陷细节的识别能力和鲁棒性。图像预处理与数据集构建过程通过PyCharm进行脚本化实现,包括自动裁剪、数据增强和文件结构整理。考虑到喷嘴在LDM打印过程中的持续运动及光照变化,采用亮度、对比度、色调、饱和度的随机调整及小角度旋转等方式进行数据增强,以提升模型的泛化能力。模型训练过程产生的准确率曲线和损失曲线等可视化结果使用Origin绘制,以获得更清晰的图形展示效果;实验流程示意图及部分图像展示在PPT中进行排版与呈现。最终共获得4854张有效图像,并按照7:2:1的比例划分为训练集、验证集和测试集,分别用于模型训练、超参数调优和性能评估。
如图11所示,为本研究模型训练过程中的学习率(LR)变化曲线。训练采用Adam优化器,初始学习率设定为0.001,并在训练过程中按照线性衰减策略逐步降低,至第50轮时接近于0。因此,将训练轮数设置为50轮,在学习率策略与模型收敛速度之间实现良好平衡,确保模型在保持较高精度的同时,具备较好的训练效率与泛化能力。
在实验方法中设计了模块消融实验,构建了多个包含或不包含Swin Transformer的模型进行对比分析,实验结果如表2所示。
在对比ResNet18、ResNet34、VGG16、VGG19、MobileNet 和 AlexNet 等多个网络模型后发现,ResNet34在喷嘴挤出缺陷识别任务中的整体表现最优,准确率达到88.27%,宏召回率为90.85%。说明相比其他CNN模型,ResNet34在本任务中具有更强的特征提取和识别能力。同时,将原始CNN网络与其对应加入Swin Transformer模块的双通道结构进行比较,如ResNet18与SWT-ResNet18、ResNet34与SWT-ResNet34、VGG16与SWT-VGG16、VGG19与SWT-VGG19,从实验结果得出加入Swin Transformer模块的双通道网络模型在喷嘴挤出缺陷数据集上的表现不仅优于不包含Swin Transformer的网络模型,而且优于常用的MobileNet与AlexNet。由此可知包含Swin Transformer模块的双通道特征提取网络结构优于单通道的CNNs网络。此外,SWT系列模型在整体表现上也明显优于MobileNet和AlexNet,进一步验证了引入Swin Transformer的双通道特征提取结构在提升喷嘴缺陷识别精度方面的优势。
在2.2的对比实验中,SWT-ResNet34在喷嘴挤出缺陷数据集上表现最佳。因此,以SWT-ResNet34作为基础特征提取网络,进一步通过在其后添加或不添加DCMSFF特征融合模块的方式,验证DCMSFF模块在提升模型识别性能方面的有效性。
由表3可知,加入DCMSFF特征融合模块后的SWT-ResNet34-DCMSFF模型在准确率和宏召回率上分别比SWT-ResNet34提升了4.11%和4%,验证了DCMSFF模块对提升模型性能的显著作用。为进一步评估DCMSFF模块的效果,本文采用准确率和宏召回率两项指标,对模型在不同喷嘴挤出缺陷类别上的识别效果进行分析(见表4和表5)。在堵料、过量、颗粒状、干涉四类缺陷中,SWT-ResNet34-DCMSFF在准确率和宏召回率上均优于未引入DCMSFF的模型,说明DCMSFF模块能有效增强模型对缺陷的识别能力。尤其对类间差异较小的干涉与颗粒状缺陷,SWT-ResNet34-DCMSFF模型的准确率和宏召回率分别达到了97.86%、96.88%和94.90%、99.97%,比SWT-ResNet34提升了1.76%、2.88%和5.80%、8.57%。从图13混淆矩阵也可看出,各类缺陷分类准确率较高,误判样本极少,干涉与颗粒状缺陷之间仅错判3例。DCMSFF模块通过通道和空间注意力交互增强局部与全局特征融合,提升了模型在复杂模糊场景下的识别精度。此外,SWT-ResNet34-DCMSFF模型对正常挤出状态的准确率和宏召回率分别达到了97.63%、96.88%,较SWT-ResNet34提升3.59%和3.65%,为后续工艺参数监测提供了更高质量的图像数据支持。
图12展示了SWT-ResNet34-DCMSFF模型在训练集(train)和验证集(val)上的准确率变化趋势。随着训练轮次增加,训练准确率持续上升并趋近于1,说明模型对训练数据的特征学习十分充分。相比之下,验证准确率虽然同样稳步提升,但其增长更加平缓,并在后期保持在一个稳定的高水平,表明模型在未见样本上的预测能力较强。此外,训练与验证准确率之间未出现明显分离,二者差距逐渐缩小,说明模型没有出现过拟合,且泛化性能较为理想。
图13展示了模型在喷嘴挤出缺陷识别任务中的混淆矩阵。其中纵轴表示真实标签,横轴表示模型预测标签,矩阵中对角线处的元素表示被准确分类的样本数量,即模型预测结果与真实标签一致的样本数;而非对角线位置的数值则代表分类错误的样本数量。从结果可以看出,模型对各类挤出缺陷的分类效果整体较为理想。正常类样本中有123个被正确识别,干涉类正确识别94个样本,颗粒状、过量和堵料类的识别也较准确,分别正确分类了56、93和108个样本。虽然存在少量误判,例如将正常类误分为堵料(1个)和过量(2个),但整体识别准确率达到97.53%,表明该模型具备较强的分类能力,能有效区分不同类型的喷嘴挤出缺陷。
本研究针对低温沉积(LDM)食品3D打印过程中的挤出缺陷识别难题,融合深度学习与机器视觉技术,构建了一套高效、智能的缺陷监测与识别系统。结果表明,引入DCMSFF特征融合模块后,SWT-ResNet34-DCMSFF模型在准确率和宏召回率上分别较SWT-ResNet34提升了4.11%和4%,显著增强了模型性能。进一步对五类喷嘴状态进行评估,在堵料、过量、颗粒状和喷嘴干涉缺陷上,DCMSFF模块均提升了准确率和宏召回率,尤其在干涉和颗粒状这两类差异性较小的缺陷中,准确率和宏召回率分别达到97.86%、96.88%和94.90%、99.97%,相比基础模型提升了1.76%、2.88%和5.80%、8.57%。混淆矩阵结果也显示各类缺陷分类准确率接近理想,仅有3例干涉与颗粒状挤出误判,说明DCMSFF模块通过通道与空间注意力交互提升了特征区分能力与关注精度,增强了模型在复杂场景下的判别能力。同时,对喷嘴正常状态的识别也更为准确,准确率和宏召回率分别提升至97.63%、96.88%,平均每帧图像的检测耗时仅为0.2 s,展示出较强的实时性,具备在线部署的初步能力,为后续实现闭环控制提供了良好的基础,为后续工艺监测提供更优数据支撑。
然而,LDM工艺中常用的海藻酸盐等材料在物理性质与成型表现上存在差异,可能对图像特征提取产生影响,进而限制模型的泛化能力。受限于当前数据与实验条件,尚未开展跨材料的系统验证。后续将扩展材料种类,构建多材料缺陷图像数据集,并结合迁移学习与多任务学习策略,提升模型在多种热敏性材料下的识别鲁棒性与工程适应性。此外,目前模型主要聚焦于图像层面的缺陷类型识别,下一阶段将结合打印过程中关键参数的实时监测,构建面向食品3D打印的过程调控模型,进一步研究材料行为与打印质量之间的关联,为参数优化、闭环控制及系统智能集成奠定基础。

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2026年第47卷第5期
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doi: 10.13386/j.issn1002-0306.2025040229
  • 接收时间:2025-04-18
  • 首发时间:2026-10-24
  • 出版时间:2026-03-01
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    1大连工业大学机械工程与自动化学院,辽宁大连 116034
    2海洋食品加工与安全控制全国重点实验室,国家海洋食品工程技术研究中心,辽宁省海产品精深加工产业共性技术创新平台,大连市中式预制食品技术创新中心,辽宁大连 116034
    3大连工业大学食品交叉科学研究院,辽宁大连 116034
    4大连长丰实业总公司,辽宁大连 116092

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孟庆国(1985−),男,学士,高级工程师,研究方向:机器视觉与机械自动化技术,E-mail:。
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2种不同金属材料的力学参数
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Percentage of
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属
Genus
种数
Number of
species
占总种数比例
Percentage of total
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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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