基於Faster R-CNN應用於 金屬零件表面之瑕疵檢測優化;Enhanced Defect Detection on Metal Component Surfaces Utilizing Faster R-CNN

NCUIR > College of Electrical Engineering & Computer Science > Executive Master of Communication Engineering > Electronic Thesis & Dissertation > Item 987654321/92311

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/92311

Title:	基於Faster R-CNN應用於金屬零件表面之瑕疵檢測優化;Enhanced Defect Detection on Metal Component Surfaces Utilizing Faster R-CNN
Authors:	房彥呈;Fang, Yen Cheng
Contributors:	通訊工程學系在職專班
Keywords:	瑕疵檢測;物件偵測;轉移學習;Faster R-CNN;Object Detection;Transfer Learning
Date:	2023-07-17
Issue Date:	2023-10-04 15:26:11 (UTC+8)
Publisher:	國立中央大學
Abstract:	在工業4.0的時代，大量且快速生產的節奏下，為了提升製程的品質必須要進行有效率且精準的檢測。傳統是以人工目視檢測進行瑕疵的判定，這不僅耗時且誤判率也可能隨人員的精神狀態而起伏，再加上以人目視檢測的誤判率也因金屬零件複雜程度增加而有上升的趨勢，使得製造業者開始導入自動光學檢測系統取代傳統人力作業；然而現今以影像辨識為主的自動光學檢測系統為了達到接近百分之百檢出率，往往會造成高誤判率，使得被機器挑出的候選影像大多是假缺陷。因此本研究嘗試應用以卷積神經網路的方法加強金屬零件表面瑕疵檢測，目的是降低自動光學系統造成的高誤判率現況，希望能藉卷積神經網路對圖像分類領域所帶來突破性的研究成果也一併套用至檢測技術領域上，本研究以Faster R-CNN作為主架構，原始模型的整體指標(mAP)為 89.720，經過使用COCO (ResNet-50)預訓練模型，再透過轉移學習把已經訓練好的模型、參數，共享至另外一個新的模型上，進而達到優化Faster R-CNN演算法的目的，優化過後的整體指標(mAP)可達到 94.223，提高了 5% 左右。;Amidst the rhythm of rapid and large-scale production in the era of Industry 4.0, effective and precise inspection is pivotal to boost process quality. Traditionally, defect detection hinged on manual visual inspection, which proved not only time-consuming but also vulnerable to fluctuating misjudgment rates due to the inspector′s mental condition. Moreover, with an escalating complexity of metal components, the misjudgment rates of human visual inspection have an increasing tendency, leading manufacturers to adopt automated optical inspection systems in lieu of conventional manual labor. However, present automated optical inspection systems, primarily driven by image recognition, often incur high misjudgment rates in the pursuit of near-perfect detection rates, resulting in a majority of machine-selected candidate images being false defects. This study attempts to apply convolutional neural network techniques to enhance the surface defect detection of metal components, aiming to alleviate the high misjudgment rates caused by automated optical systems. It aspires to adopt the revolutionary outcomes from the field of image classification driven by convolutional neural networks into the domain of detection technology. The Faster R-CNN model serves as the main architecture for this research. The overall Mean Average Precision (mAP) of the original model is 89.720. By employing the COCO (ResNet-50) pre-trained model and subsequent transfer learning to share the well-trained model and its parameters to a new model, the aim is to optimize the Faster R-CNN algorithm. Consequently, the overall mAP of the optimized model achieves 94.223, marking an approximate improvement of 5%.
Appears in Collections:	[Executive Master of Communication Engineering] Electronic Thesis & Dissertation

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