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研究生:Chu Toan Thang
研究生(外文):Chu Toan Thang
論文名稱:運用創新混合式相位還原對策於多類數位條紋光之三維形貌量測
論文名稱(外文):Multi-frequency Digital Fringe Projection Profilometry Using a Novel Hybrid Phase Unwrapping Strategy
指導教授:陳亮嘉林志哲林志哲引用關係
口試委員:陳亮嘉林志哲林志平劉正良
口試日期:2018-07-30
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:自動化科技研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2018
畢業學年度:106
語文別:英文
論文頁數:64
中文關鍵詞:混合式相位還原時間域相位還原空間域相位還原條紋光之三維形貌量測
外文關鍵詞:Hybrid phase unwrapTemporal phase unwrapSpatial phase unwrapFringe project profilometry
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正弦條紋光之三維形貌量測是3D形貌量測中最流行的其中一種技術。在通過條紋分析獲得不連續相位圖,相位圖需要經過還原以得到連續的相位還原圖。在本論文中,提出了一種混合式相位還原對策,通過結合空間域相位還原和時間域相位還原來提升相位還原演算法的精度。空間域相位還原在還原連續表面的相位時非常強健。然而,該方法不能還原非連續表面的相位。另一方面,時間域相位還原能夠掃描任意形狀的表面。然而,該方法對雜訊非常敏感。本文所提出的方法利用了這兩種方法的優點來得到一種更加穩固的相位還原演算法。實驗結果初步的展現了此方法的有效性與可應用性。相比較於傳統的時間域相位還原,本文所提出的方法能得到更加強健的相位圖,特別是在低訊噪比的地方。
Fringe Projection Profilometry using sinusoidal fringes is one of the most popular techniques employed in 3D surface measurement. After obtaining wrapped phase map by fringe analysis methods, phase map needs to be unwrapped to get continuous unwrapped phase map. In this article, a hybrid phase unwrapping strategy was developed to enhance the accuracy of the unwrapped algorithm by combining spatial and temporal phase unwrapping method. The spatial phase unwrapping method is robust for unwrapping at continuous surfaces. However, it cannot correctly unwrap for discontinue surfaces. On another hand, the temporal unwrapping method can scan at arbitrary shape surfaces. However, the temporal unwrapping method is very delicate to noise. The proposed method exploits the advantages of these two methods to obtain a more robust unwrapped phase algorithm. Experimental results preliminarily demonstrate the validity and applicability of this proposed method. In comparison with conventional temporal unwrapping method, the proposed method can achieve more robust unwrapped phase map, especially in low signal-to-noise areas.
ABSTRACT i
摘要 ii
ACKNOWLEDGMENTS iii
LIST OF FIGURES vi
List of Symbols and Notations x
Chapter 1 INTRODUCTION 1
1.1 Background 1
1.1.1 Digital fringe pattern projection 1
1.1.2 Fringe pattern projection profilometry principle 2
1.1.3 Hariharan Fringe Analysis 5
1.1.4 Phase unwrapping 8
1.2 Statement of research problem 10
1.3 Research objectives 12
1.4 Expected contributions of the research 12
1.5 Thesis Organization 13
Chapter 2 LITERATURE REVIEW 14
2.1 Spatial Phase Unwrapping Methods 14
2.1.1 Spatial Phase Unwrapping Methods 15
2.1.2 Quality Maps 18
2.1.3 Goldstein’s Brach Cut Algorithm 19
2.1.4 Mask Cut Algorithm 21
2.2 Temporal Phase Unwrapping Methods 23
2.2.1 Multi-frequency (Hierarchical) method 25
2.2.2 Multi-frequency (Heterodyne) method 26
2.3 Conclusion 28
Chapter 3 RESEARCH METHODOLOGY 30
3.1 Introduction 30
3.2 Phase discontinue detection 31
3.3 Create Branch-cut 39
3.4 Apply Temporal and Spatial Unwrapping Method 42
3.5 Using Temporal Unwrapped Phase Map for calibrate Spatial Unwrapped Phase Map 44
3.6 Summary 46
Chapter 4 EXPERIMENTAL RESULTS AND ANALYSES 49
4.1 System setup and pre-scanning preparation 49
4.2 Experimental results and discussion 53
4.3 Conclusion 58
Chapter 5 CONCLUSIONS AND FUTURE DEVELOPMENT 59
5.1 Concluding Remarks 59
5.2 Future Development 60
References 62
Biography 64
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