Defect detection of low-resolution ceramic substrate image based on knowledge distillation

GUO Feng; SUN Xiaodong; ZHU Qibing; HUANG Min; XU Xiaoxiang

doi:10.37188/OPE.20233120.3065

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Defect detection of low-resolution ceramic substrate image based on knowledge distillation

Information Sciences | 更新时间：2023-11-27

- Defect detection of low-resolution ceramic substrate image based on knowledge distillation
- Optics and Precision Engineering Vol. 31, Issue 20, Pages: 3065-3076(2023)
- 作者机构：
  
  1.江南大学轻工过程先进控制教育部重点实验室，江苏无锡 214122
  2.无锡市创凯电气控制设备有限公司，江苏无锡 214400
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20233120.3065
  CLC： TP391.4
- Received：10 April 2023，
  
  Revised：17 July 2023，
  
  Published：25 October 2023
- 稿件说明：
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郭峰,孙小栋,朱启兵等.基于知识蒸馏的低分辨率陶瓷基板图像瑕疵检测[J].光学精密工程,2023,31(20):3065-3076.

GUO Feng,SUN Xiaodong,ZHU Qibing,et al.Defect detection of low-resolution ceramic substrate image based on knowledge distillation[J].Optics and Precision Engineering,2023,31(20):3065-3076.
郭峰,孙小栋,朱启兵等.基于知识蒸馏的低分辨率陶瓷基板图像瑕疵检测[J].光学精密工程,2023,31(20):3065-3076. DOI： 10.37188/OPE.20233120.3065.

GUO Feng,SUN Xiaodong,ZHU Qibing,et al.Defect detection of low-resolution ceramic substrate image based on knowledge distillation[J].Optics and Precision Engineering,2023,31(20):3065-3076. DOI： 10.37188/OPE.20233120.3065.

摘要

陶瓷基板是电子器件的重要基础材料，利用机器视觉技术结合深度学习策略实现陶瓷基板的瑕疵检测对保证产品质量具有重要的意义。增加成像设备的视场以实现多个陶瓷基板的同时成像，可以显著提高陶瓷基板的检测速度；但也带来了图像分辨率的降低，并最终导致瑕疵检测精度的降低。针对上述问题，本文提出了一种基于知识蒸馏的低分辨率陶瓷基板瑕疵自动检测方法。该方法利用YOLOv5框架分别构建了教师网络和学生网络，基于知识蒸馏思想将教师网络获得的高分辨率图像特征信息指导学生网络的训练，以提高学生网络对低分辨率陶瓷基板图像的瑕疵检测能力；同时，在教师网络中引入基于Coordinate Attention （CA）注意力思想的特征融合模块，使得教师网络学习到的特征同时适应高分辨率图像信息和低分辨率图像信息，从而能较好地指导学生网络的训练；最后，引入基于Gradient Harmonizing Mechanism（GHM）的置信度损失函数，以提高瑕疵的检出率。实验结果表明，本文基于知识蒸馏的陶瓷基板瑕疵检测方法对于224×224分辨率输入图像的污渍、异物、多金、缺瓷以及损伤这五类瑕疵检测的平均准确率和平均召回率分别达到了96.80%和90.01%，相比于目前主流的目标检测算法，本文算法取得了更好的检测结果。

Abstract

Ceramic substrate is a vital foundational material of electronic devices， and implementing defect detection for ceramic substrates using machine vision technology combined with deep learning strategies holds significant importance in ensuring product quality. Increasing the field of view of the imaging equipment to make simultaneous imaging of multiple ceramic substrates possible can significantly improve the detection speed of a ceramic substrate. However， it also results in decreased image resolution and subsequently reduces the accuracy of defect detection. To solve these problems， a low-resolution ceramic substrate defect automatic detection method based on knowledge distillation is proposed. The method utilizes the YOLOv5 framework to construct a teacher network and a student network. Based on the idea of knowledge distillation， high-resolution image feature information obtained by the teacher network is used to guide the training of the student network to improve the defect detection ability of the student network for low-resolution ceramic substrate images. Moreover， a feature fusion module based on the coordinate attention （CA） idea is introduced into the teacher network， enabling it to learn features that adapt to both high-resolution and low-resolution image information， thus better guiding the training of the student network. Finally， a confidence loss function based on the gradient harmonizing mechanism （GHM） is introduced to enhance the defect detection rate. Experimental results demonstrate that the proposed ceramic substrate defect detection method based on knowledge distillation achieves an average accuracy and average recall of 96.80% and 90.01%， respectively， for the detection of five types of defect-stain， foreign matter， gold edge bulge， ceramic gap， and damage-in low-resolution （224×224） input images. Compared with current mainstream object detection algorithms， the proposed algorithm achieves better detection results.

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references

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