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研究生:林家慶
研究生(外文):LIN,JIA-CING
論文名稱:圓柱表面上網印圖樣之瑕疵檢測
論文名稱(外文):Defects Detection of Printed Pattern on the Cylindrical
指導教授:吳先晃
指導教授(外文):Hsien-Huang Wu
口試委員:張軒庭張文陽吳先晃
口試委員(外文):SYUAN-TING JHANGWUN-YANG JHANGHsien-Huang Wu
口試日期:2014-07-23
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電機工程系
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:2014
畢業學年度:102
語文別:中文
論文頁數:50
中文關鍵詞:樣板比對瑕疵檢測線掃描相機圓柱表面
外文關鍵詞:template matchingdefect detectionline-scan cameracylindrical surface
相關次數:
  • 被引用被引用:1
  • 點閱點閱:522
  • 評分評分:
  • 下載下載:25
  • 收藏至我的研究室書目清單書目收藏:0
目前多數網版印刷的標誌還是經由人工的方式進行檢測,利用人眼逐個查看印上去的標誌是否有瑕疵,之後再進烤箱烘烤完成網印的程序。墨水經過烘烤之後是無法擦拭掉的,所以在標誌的瑕疵檢測過程中必須非常小心,因每日數千根的產量加上網印的標誌最小只有1mm的範圍,在長時間的查看下易使人眼疲累而造成誤判,為了處理龐大的產量及減低誤判的機率,本文在此利用自動光學檢測(Automated Optical Inspection , AOI)系統,希望藉此取代或輔助費時且費力的人工檢測。
本文的實驗平台為桌上型電腦,其搭配網印機台、線掃瞄相機和同軸光源進行取像,待測的對象為圓柱體上的標誌,目的是檢測待測物上的標誌是否存在瑕疵,而選用線掃瞄相機是因其具有較高的拍攝速度以及可將圓柱表面延展開來的效果以便於作影像分析。首先將取像後的標誌分成數個子標誌,再將其儲存成標準樣板,利用正規化的相關運算來定位各個子標誌,在檢查瑕疵方面,本文利用形態學建立兩種標準樣板,而後使用邏輯運算檢測是否存在瑕疵。
實驗結果顯示,在圓柱體並非筆直的情況下所產生的些許形變是可以容許的;毛邊、缺角、缺印在超出公差(80μm)的標誌瑕疵皆能檢測出來,檢測一個完整的標誌所花費的時間約為0.4秒,但在精確定位時會失去一些訊息,則會忽略多印的瑕疵。

Currently, most screen printing of logo still conducted with manual inspection. Utilization eyes view all of marks is individually for obvious flaws then put into oven baking to complete the process of the screen printing.
Ink is impossible to wipe after baking, so defect inspection of logo process need to very careful. Because the root of the daily production with thousands screen printing of sub-logo in the minimum allowable 1mm only. After a long time with manual inspection is easy to make eyes fatigue caused by misjudgment. In order to handle huge production and reduce false rate, this paper use Automated Optical Inspection (AOI) system hoping to replace or auxiliary requiring much time and effort manual inspection.
In this paper, the experimental platform for desktop computers with screen printing machine, line scan camera and use on-Axis lights to capture images. Device under test (DUT) is cylinder which is logo, supposed to check the DUT mark whether there are flaws or not. The reason to choose line scan camera is that it possesses high frame speed and the effect of expand the cylinder's surface, which will be efficient to conduct image analysis.
First, make the logo after imaging which is divided into several sub-logo, then save it as a standard template. Use normalized cross-correlation to alignment the various sub-logo in term to defect inspection. This paper using morphological to create two standard template and using logic operation whether there are flaws or not.
After experimental results showed, in the case of cylinder is non-straight to generate by fewer deformation may be tolerated; Fiber, Void and Lose Print are out of tolerance (80μm), the logo can be detected. When detect a whole logo will take about 0.4 seconds there will be lose some information when accurate positioning, which is ignored some Contamination flaws.

中文摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第1章 緒論 1
1.1 研究背景 1
1.2 研究動機與目的 2
1.3 文獻探討 3
1.4 論文架構 4
第2章 系統架構 5
2.1 旋轉機構 5
2.2 取像系統 9
2.2.1 相機 9
2.2.2 光源 13
2.2.3 鏡頭 14
2.2.4 影像擷取卡 15
2.2.5 線性編碼器 15
第3章 圖像處理技術 17
3.1 形態學 17
3.2 Otsu演算法 18
3.3 連通區域標記 20
3.4 正規化的相關運算(Normalized Cross-Correlation , NCC) 22
第4章 標誌定位與檢測 24
4.1 影像校正 24
4.2 選取ROI 25
4.3 樣板定位 27
4.3.1 粗略定位 27
4.3.2 切割標誌區塊、精準定位 28
4.4 標誌瑕疵檢測 29
4.4.1 多印與毛邊檢測 29
4.4.2 缺角與少印檢測 30
第5章 實驗結果 32
5.1 圖像校正結果 32
5.2 瑕疵檢測結果 33
5.3 形變失真容許 36
第6章 結論 37
參考文獻 39

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