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研究生:VIVIN OCTOWINANDI
研究生(外文):VIVIN OCTOWINANDI
論文名稱:The Study of Determining Shifted Drill Hole Position Based on Misalignment Defect Images on Multi-layer PCB
論文名稱(外文):The Study of Determining Shifted Drill Hole Position Based on Misalignment Defect Images on Multi-layer PCB
指導教授:黃有評黃有評引用關係
指導教授(外文):HUANG, YO-PING
口試委員:謝尚琳洪瑞鍾張玉山李祖添
口試委員(外文):HSIEH, SHANG-LINHUNG, JUI-CHUNGCHANG, YUE-SHANLI, ZU-TIAN
口試日期:2020-07-10
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電資國際專班(iEECS)
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2020
畢業學年度:108
語文別:英文
論文頁數:62
外文關鍵詞:Printed circuits board (PCB)Multi-layer PCBMisalignment defectImage processing
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Multi-layer PCBs have been widely applied in electronic industry due to their capability to provide complex electronic circuits in a tight space. Although the manufacturing of multi-layer PCBs has involved a variety of technologies to ensure the quality of multi-layer PCBs, defects in multi-layer PCB products cannot be completely eliminated. One of the reasons is a misalignment defect. The consequence of misalignment defect on multi-layer PCB is that the drill holes were not in the center or even outside the copper pad area. Therefore, in this study we develop an image processing model to measure the distance of the drill holes needed to be shifted from their original positions so that the drill hole positions can be relocated at the concentric copper pad point. By drawing a copper pad circle on each PCB copper layer and a drill hole in the middle of the copper pads as a reference, we create an environment so that the system can measure the length and direction of shifted drill hole position. By extracting the edge pixel of copper pad circle, we compute the gravity center to get the concentric copper circle point. The length and direction of shifted drill hole was obtained by computing the length and direction between concentric copper circle point and drill hole center point. Experiment results show that as the distance of the shifted drill hole position increases, the direction of the shifted drill hole position becomes more precise. The longest shifted drill hole length position found in the experiment was 186.97±6.57% m with direction precision, while the shortest drill hole length position was 30.16±123.63% m with direction precision.
CONTENTS
Abstract… i
Dedication iii
Acknowledgments iv
CONTENTS v
List of Tables vii
List of Figures viii
Chapter 1 Introduction 1
1.1 The Background of Study 1
1.2 Related Works 2
1.3 Research Objective 4
1.4 Limitations 5
1.5 Thesis Development 5
Chapter 2 Literature Review 6
2.1 Multi-layer PCB 6
2.2 PCB Design 8
2.3 Digital X-Ray Imaging 9
2.4 Digital Image Processing 11
Chapter 3 Proposed Method 12
3.1 Dataset 13
3.2 Image Processing 14
3.2.1 Image Filtering 14
3.2.2 Image Thresholding 16
3.2.3 Drill Hole Area Detection 17
3.2.4 Drill Hole Center Point Detection 18
3.2.5 Copper Circle Detection 20
3.2.6 Misalignment Detection 26
3.3 Shifted Drill Hole Position 30
Chapter 4 Experimental Results and Discussions 31
4.1 Coordinates of Drill Hole Center 31
4.2 Coordinates of Copper Circles Centroid 32
4.3 Results of Shifted Drill Hole Direction 33
4.4 Final Results 37
4.5 Results Comparison 54
Chapter 5 Conclusions and Future Work 56
5.1 Conclusions 56
5.2 Future Works 57
References 58
Appendix 61
Appendix 1. View X 2000 specification. 61


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