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研究生:張鈺屏
研究生(外文):Yu-Ping Chang
論文名稱:視窗型傅立葉轉換雜訊濾除演算法之最佳參數選取
論文名稱(外文):Parameter selection of windowed Fourier transform noise removal algorithm
指導教授:林立謙
指導教授(外文):Li-Chien Lin
學位類別:碩士
校院名稱:逢甲大學
系所名稱:通訊工程所
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:2012
畢業學年度:100
語文別:中文
論文頁數:83
中文關鍵詞:視窗型傅立葉濾波視窗型傅立葉轉換數位全像顯微系統最佳參數選取雜訊濾除
外文關鍵詞:windowed Fourier transformwindowed Fourier filteringparameter selectiondigital holographic microscopy system (DHM)noise removal
相關次數:
  • 被引用被引用:2
  • 點閱點閱:323
  • 評分評分:
  • 下載下載:31
  • 收藏至我的研究室書目清單書目收藏:0
數位全像術(Digital holography)最大的特點為利用記錄帶有物體表面輪廓資訊之波前來記錄物體的三維資訊,從此資訊中可以觀察到物體的真實型態及立體資訊。藉由這樣的技術基礎,我們在系統中加入顯微物鏡放大物體影像,使系統可觀測微小物體,此系統即為數位全像顯微系統(Digital holography microscopy system),專門用來拍攝活體細胞,觀察細胞生長情形。
在光學影像拍攝之過程中,數位全像顯微系統因同調干涉產生之繞射失真、影像擷取器產生之偵測失真和取像過程中光學元件不完美之失真等因素,導致系統受到雜訊影響,使觀測者無法觀察物體影像正確資訊。本文主要內容為延續「細胞之相位展開之影像處理方法」之研究,針對視窗型傅立葉濾波(Windowed Fourier filtering)建立最佳參數選取之準則,使雜訊濾除效能達到最高並保有最多的原始影像資訊,恢復物體真實型態,降低雜訊對相位資訊之影響。
除此之外,本文也利用濾波前後物體體積變化精確度之分析與輪廓曲線之變化,驗證演算法效能和濾波最佳參數選取是否正確。
Digital holography (DH) uses optical interference technique to record the complex field; the intensity and phase, of the specimen. The phase information contains the quantity information of the surface profile of the three-dimensional object. In advance, digital holography microscopy system (DHM) adds a microscope objective (MO) to record the magnify objects. The lateral and the longitudinal resolution of the DHM system are about 0.5 micrometer and 1 micrometer, respectively. In this way it is suitable for the observation of the living cells, thus we develop the DHM system and apply it to the measurement of cell’s surface profile.
In this thesis, we examine the noise effect of the DHM system. The noise of the DHM system mainly comes from the diffraction distortion, detection error, interference parasite, coherence noise, and imperfection of the optical elements. These noises will highly perturb the measurement result and lead the incorrect quantitative surface profile of the specimens.
Thus, I propose the windowed Fourier filtering (WFF) algorithm to reduce the noise effect of the DHM system. By experiments, I find that the parameters, including the window size and the threshold value, are important for the performance of the proposed WFF algorithm. Therefore, how to select the optimal parameters becomes main issue for this algorithm. Here, the selection of the optimal parameters is examined and applies it to the WFF algorithm of the DHM system. The experimental results show the performance of the WFF algorithm by using the optimal parameters.
誌謝 I
摘要 III
Abstract IV
目錄 V
圖目錄 VII
表目錄 X
第一章 緒論 1
1.1 研究動機與目的 1
1.2 本研究之貢獻 2
1.3 本文架構 2
第二章 光學系統簡介 3
2.1 數位全像顯微系統之系統架構 3
2.2 數位全像顯微系統記錄與重建 7
2.2.1 數位全像顯微系統之記錄 8
2.2.2 模擬光波繞射 10
2.2.3 數位全像顯微系統之數值重建 13
第三章 視窗型傅立葉轉換雜訊濾除演算法 15
3.1 視窗型傅立葉轉換演算法原理 17
3.1.1 視窗型傅立葉轉換 17
3.1.2 視窗型傅立葉濾波 19
3.2 視窗型傅立葉濾波最佳參數選取 21
3.2.1 最佳視窗寬度選取 23
3.2.2 最佳門檻值選取 29
第四章 模擬與實驗 33
4.1 微透鏡陣列影像理想值建立 33
4.2 視窗型傅立葉濾波最佳參數計算 38
4.3 微透鏡陣列影像體積變化之精確度分析 44
4.4 實際應用於細胞影像之結果 55
第五章 結論與未來展望 68
參考文獻 69
附錄 標準常態分佈曲線下面積表 71
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