纸膜双层缺陷检测的视觉成像光场设计  

Design of optical field of vision imaging for defect detection of paper and transparent film

作　　者：蒋仕飞 张兆国 王法安[3] 解开婷 王成琳 李治 JIANG Shi-fei;ZHANG Zhao-guo;WANG Fa-an;XIE Kai-ting;WANG Cheng-lin;LI Zhi(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Tobacco Machinery Co.,Ltd.,Kunming 650000,China;Faculty of Modern Agricultural Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500 [2]云南烟草机械有限责任公司,云南昆明650000 [3]昆明理工大学现代农业工程学院,云南昆明650500

出　　处：《中国光学（中英文）》2024年第2期354-365,共12页Chinese Optics

基　　金：国家重点研发计划项目(No.2022YFD2002004);云南省院士(专家)工作站项目(No.202105AF150030);云南中烟重点项目(No.2022ZK05)。

摘　　要：为实现包装盒纸质基底层和透明膜层缺陷的同步检测,开展了对纸和膜缺陷的同步成像研究。首先,分别建立了标准球面积分光场、椭球面积分光场和弧面积分光场模型,并利用COMSOL Multiphysics 5.6对3类光场进行射线仿真,对比分析了球面积分光场下射线角度均匀性及辐照均匀性,通过正交仿真优化椭球面积分光场参数;其次,在椭球面积分光场环境、亮场前打光环境、暗场前打光环境下对包装盒成像。与此同时,对包装盒的油污、抵触、开口、泡皱、破损5项常见缺陷依次进行物理检测和机器视觉检测,验证缺陷成像的有效性。试验结果表明,在椭球面积分光场下成像,图像对纸质基底层缺陷特征、透明膜层缺陷特征均有较好的呈现效果,图像上油污、抵触、开口、泡皱、破损的物理检出率分别为96.2%、92.5%、100%、95%、92%,异常检出率分别为98.6%、97.5%、100%、100%、98.4%,缺陷类别检出率分别为97.6%、96%、100%、97%、96%。研究结果表明,椭球面积分光场光路角度和辐照强度均匀,覆透明膜包装盒的缺陷特征呈现清晰,满足工业生产的检测要求。To achieve synchronous detection of defects in the paper and transparent film layers of packaging boxes,we studied the synchronous imaging of the paper and film defect.Firstly,we established models for a standard sphere integral light field,an ellipsoidal integral light field,and an arc integral light field.We then simulated three different light fields using COMSOL Multiphysics 5.6 and compared their ray angle uniform-ity and irradiation uniformity.The parameters of ellipsoidal area integral light field are optimized by ortho-gonal simulation.Secondly,the packaging box was imaged using the ellipsoidal integral light field,the bright and dark field forward lighting.Physical detection and machine vision were used to detect five common de-fects in the packaging box,including oil stains,pressure marks,openings,bubble wrinkles,and breakages,to verify the effectiveness of defect imaging.The results show that the images can clearly present defect charac-teristics in the paper base and transparent film layers under ellipsoidal integral light field.The physical detec-tion rates for oil stains,pressure marks,openings,bubble wrinkles,and breakages were 96.2%,92.5%,100%,95%,and 92%,respectively.Anomaly detection rates were 98.6%,97.5%,100%,100%,98.4%,respectively.Detection rates of defects were 97.6%,96%,100%,97%,and 96%,respectively.This study indicates that the consistent optical path angle and irradiation intensity result in a uniform ellipsoidal integral light field.Con-sequently,transparent film imaging of the packaging box shows clear defect characteristics that satisfy the standards for industrial detection application.

关 键 词：光路仿真 透明膜成像 球面积分光场 缺陷特征成像 视觉检测 COMSOL Multiphysics 5.6射线仿真 

分 类 号：TB811[一般工业技术—摄影技术] TB858.2