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研究生:李成偉
研究生(外文):Chen-wei Lee
論文名稱:利用經驗模態分解法消除干涉條紋的雷射光斑
論文名稱(外文):Speckle-reduction using the empirical mode decomposition for fringe analysis
指導教授:蘇威宏李晁逵
指導教授(外文):Wei-hung SuChao-kuei Lee
學位類別:碩士
校院名稱:國立中山大學
系所名稱:光電工程學系研究所
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:2009
畢業學年度:97
語文別:英文
論文頁數:49
中文關鍵詞:光斑干涉條紋經驗模態分解法
外文關鍵詞:specklefringe analysisEMD
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在光學檢測領域中,對影像中干涉條紋進行相位的演算是還原物體形貌必要的一個程序,其相關的實驗包括了干涉儀、Moiré分析和投影輪廓儀。然而在使用雷射光為光源時,光斑是必然所產生的結果。在本論文中,我們研究了以經驗模態分解法消除雷射光斑的可行性,並發現經過我們發展出來的模式,相位將得以精確地展開,從而還原出更清晰的影像。
Phase-extraction from fringe patterns is an inevitable procedure in many applications, such as interferometry,Moiré analysis, and profilometry using structured light illumination. However, speckle noises could be introduced when a coherent light source is used. In this thesis, we use the empirical mode decomposition (EMD) to perform the speckle-reduction. It is found that phases can be extracted with high accuracy once speckle-reduction is performed with the EMD.
Contents
Page
Abstract………………………………………………………….. I
Contents………………………………………………………..... II
List of Figures…………………………………………………… III
Chapter 1
Introduction…………………………………………………….... 1
Chapter 2
Speckle Noise…………………………………………………… 3
Chapter 3
Signal extraction by the EMD
3.1 Principle of EMD……………………………………….. 5
3.2 Quantitative analysis to speckles in frequency domain… 9
3.3 Simulation of speckle-reduction using EMD…………… 12
3.4 Statistic simulation to speckle removal…………………. 16
Chapter 4
Phase-extraction
4.1 Five-step phase-shifting algorithm……………………... 18
4.2 Phase-extraction from noisy fringe patterns……………. 19
Chapter 5
Experiments: Noise reduction using the EMD
5.1 Experiment setup……………………………………….. 21
5.2 Phase-extraction………………………………………… 23
5.3 Comparison between the EMD and bandpass- filtering
algorithm……………………………………………....... 34
Chapter 6
Conclusion……………………………………………………..... 37
References……………………………………………………….. 38
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