基于电子样稿的柔印首件“粗-精”检测方法

肖盼; 燕舒乐; 龙进良; 肖盟; 蔡念; 陈新度

doi:10.11999/JEIT211358

基于电子样稿的柔印首件“粗-精”检测方法

doi: 10.11999/JEIT211358

肖盼¹,
燕舒乐^{1, 2},
龙进良^{1, 2},
肖盟^{1, 2},
蔡念^{1, 2, ,},
陈新度¹

1.
广东工业大学省部共建精密电子制造技术与装备国家重点实验室广州 510006
2.
广东工业大学信息工程学院广州 510006

基金项目: 国家重点实验室开放基金(2019DG780017)，国家自然科学基金(62171142)，广东省自然科学基金(2021A1515011908)，惠州市高校科研专项资金项目(2019HZKY003)

详细信息

作者简介:
肖盼：女，1992年生，博士生，研究方向为机器视觉、缺陷检测、智能制造系统等

燕舒乐：女，1999年生，硕士生，研究方向为缺陷检测、图像处理等

龙进良：男，2000年生，硕士生，研究方向为缺陷检测、图像处理等

肖盟：男，1998年生，硕士生，研究方向为机器视觉、缺陷检测、图像分割等

蔡念：男，1976年生，教授，研究方向为机器学习、机器视觉、数字信号处理等

陈新度：男，1967年生，教授，博士生导师，研究方向为机器人视觉、智能制造系统

通讯作者:
蔡念　cainian@gdut.edu.cn

中图分类号: TN274
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-29
- 修回日期: 2022-03-30
- 网络出版日期: 2022-04-12
- 刊出日期: 2022-05-25

Coarse-to-fine Inspection for Flexo First Item Based on the Electronic Sample

XIAO Pan¹,
YAN Shule^{1, 2},
LONG Jinliang^{1, 2},
XIAO Meng^{1, 2},
CAI Nian^{1, 2
, ,},
CHEN Xindu¹

1.
State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China
2.
School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China

Funds: State Key Laboratory Open Fund Project(2019DG780017), The National Natural Science Foundation of China (62171142), The Natural Science Foundation of Guangdong Province (2021A1515011908), The Research Fund for Colleges and Universities in Huizhou(2019HZKY003)

摘要

摘要: 为了解决柔印首件检验没有基准织物图像作为参照的难点，该文提出一种以电子样稿为参照物的柔印首件“粗-精”检测方法，主要分为粗匹配、精匹配和缺陷检测3个阶段。首先，针对电子样稿与印刷首件内容粗细不一、灰度特性差异大、柔印内容重复率高等问题，融合超点(SuperPoint)与强力匹配(SuperGlue)方法进行粗匹配。然后，针对柔印过程版材伸缩、弯曲引发柔印内容局部偏移的问题，采用归一化互相关(NCC)法微调样稿字符，实现精匹配。最后，提出约束聚类的方法将缺陷检测问题转化为电子样稿与柔印首件差异最小化的问题。对比实验表明，该文方法的柔印首件检测性能要优于其他织物印刷品缺陷检测方法，其漏检率为0，误检率为1.3%，平均Dice系数为0.941，且检测时间仅为2.761 s/pcs，满足实际工程的需求。
- 印刷缺陷检测 /
- 柔印首件 /
- 电子样稿 /
- 强力匹配 /
- 约束聚类
Abstract: In order to solve the problem that there is no real reference of the fabric image in the flexo first item inspection, a coarse-to-fine inspection method of flexo first item is proposed based on electronic samples, which is mainly divided into three stages: coarse matching, fine matching and defect detection. First, since different thickness of the characters, large differences in gray characteristics, and high repetition of flexo content inherently exist in the electronic sample and the flexo first item, the SuperGlue with SuperPoint are employed for rough matching. Then, a Normalized Cross-Correlation(NCC)-based method is used to fine-tune the electronic sample characters for fine matching, which can deal with local offsets of flexo content are caused by plate expansion and bending in flexo printing process. Finally, a constrained clustering method is proposed to transform the defect detection problem into the problem of minimizing the difference between electronic sample and flexo first item. Comparison experiments show that the proposed method can achieve better inspection performance for flexo first item, with the missed detection rate of 0, the false detection rate of 1.3%, the average Dice coefficient of 0.941, and the inspection time of 2.761 s/pcs. This promising inspection indicates that the proposed method can be well employed in real industries.
- Printing defect detection /
- Flexo first item inspection /
- Electronic sample /
- SuperGlue /
- Constrained clustering

HTML全文

图 1 本文算法框架

下载: 全尺寸图片幻灯片

图 2 SuperPoint训练步骤

下载: 全尺寸图片幻灯片

图 3 SuperGlue网络

下载: 全尺寸图片幻灯片

图 4 检测效果对比

下载: 全尺寸图片幻灯片

表 1 搜索扩展基数δ对检测性能的影响

	10	15	20	25	30	35	40	45	50
误检率(%)	1.9	0.9	0.6	0.4	1.3	0.5	0.8	0.8	1.1
漏检率(%)	2.9	1.1	2.0	2.0	0	1.0	1.8	2.0	2.4
Dice系数	0.879	0.910	0.930	0.936	0.941	0.913	0.882	0.879	0.877
处理时间(s/pcs)	2.281	2.356	2.427	2.452	2.761	2.932	3.231	3.341	3.413

下载: 导出CSV

表 2 评估阈值参数T_d对缺陷检测结果的影响

	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5
误检率(%)	42.6	1.3	0.3	0.1	0.1	0.1	0.05	0.02	0.02
漏检率(%)	0	0	5.7	30.4	32.6	40.1	44.6	48.2	49.1
Dice系数	0.548	0.941	0.943	0.941	0.938	0.917	0.912	0.910	0.906
处理时间(s/pcs)	2.643	2.761	2.801	2.842	2.803	2785	2.792	2.853	2.942

下载: 导出CSV

表 3 消融实验

方法	误检率(%)	漏检率(%)	Dice系数	检测时间(s/pcs)
粗匹配	63.4	28.1	0.192	2.342
+精匹配	16.8	5.5	0.328	2.743
+精匹配+约束聚类	1.3	0	0.941	2.761

下载: 导出CSV

表 4 不同缺陷检测方法对比

	本文	差分法^[21]	MS-SSIM^[22]	Faster R-CNN^[11]	Seg+DecNet^[12]
误检率(%)	1.3	64.6	83.5	93.3	62.3
漏检率(%)	0	45.8	6.8	3.4	29.3
Dice系数	0.941	0.257	0.069	0.0194	0.443
处理时间(s/pcs)	2.761	1.375	2.327	0.907	1.073

下载: 导出CSV

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