

FOLLOWUS
1.State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, China
2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
3.Institute of Artificial Intelligence and Robotics, Xi’an Jiaotong University, Xi’an 710049, China
E-mail: zhouchaofan@zju.edu.cn;
‡Corresponding author
slzhang@zju.edu.cn;
pingwei@mail.xjtu.edu.cn;
chenbd@mail.xjtu.edu.cn
Received:31 October 2022,
Accepted:28 November 2022,
Published:0 February 2023
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Chaofan ZHOU, Meiqin LIU, Senlin ZHANG, et al. A graph-based two-stage classification network for mobile screen defect inspection[J]. Frontiers of Information Technology & Electronic Engineering, 2023, 24(2): 203-216.
Chaofan ZHOU, Meiqin LIU, Senlin ZHANG, et al. A graph-based two-stage classification network for mobile screen defect inspection[J]. Frontiers of Information Technology & Electronic Engineering, 2023, 24(2): 203-216. DOI: 10.1631/FITEE.2200524.
缺陷检测是手机屏质量控制的重要环节。手机屏缺陷的特性带来了一些具有挑战性的问题,包括:(1)类间相似性和类内差异性;(2)低对比度、微小尺寸或不完整缺陷的识别带来的困难;(3)针对多标签图像的类别相关性建模。为了解决这些问题,本文提出一种图推理模块,它可以堆放在常规的分类模块上。该推理模块利用类别间的依赖性、图像间的关系以及类别图像之间的相互作用来扩展特征维度,并且达到改进低质量图像特征的目的。为了进一步提高分类性能,分类模块的分类器被设计为一个余弦相似度函数。在对比学习的帮助下,分类模块可以更好地初始化推理模块的类别图。在手机屏缺陷数据集上的实验表明,所提出的两阶段网络取得了最佳性能:准确率为97.7%,
F
-measure为97.3%。这证明了本文所提出的方法在工业应用中是有效的。
Defect inspection
also known as defect detection
is significant in mobile screen quality control. There are some challenging issues brought by the characteristics of screen defects
including the following: (1) the problem of interclass similarity and intraclass variation
(2) the difficulty in distinguishing low contrast
tiny-sized
or incomplete defects
and (3) the modeling of category dependencies for multi-label images. To solve these problems
a graph reasoning module
stacked on a classification module
is proposed to expand the feature dimension and improve low-quality image features by exploiting category-wise dependency
image-wise relations
and interactions between them. To further improve the classification performance
the classifier of the classification module is redesigned as a cosine similarity function. With the help of contrastive learning
the classification module can better initialize the category-wise graph of the reasoning module. Experiments on the mobile screen defect dataset show that our two-stage network achieves the following best performances: 97.7% accuracy and 97.3%
F
-measure. This proves that the proposed approach is effective in industrial applications.
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