Responsive image
博碩士論文 etd-0825109-200312 詳細資訊
Title page for etd-0825109-200312
論文名稱
Title
考慮失焦透鏡之影像還原
Restoration for Images Blurred by Defocus Lens
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
61
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2009-07-28
繳交日期
Date of Submission
2009-08-25
關鍵字
Keywords
影像、還原、失焦、薄膜
restoration, image, phase mask, defocus
統計
Statistics
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中文摘要
在影像系統中,失焦是十分容易產生的一個問題;在不同的物距下,會對應到不同的焦距。而所想拍攝的物體們不一定都是在等距離的範圍內,因此在焦距只能有一個的情況下,在其他距離外的物體就會在成像上產生了模糊的現象。
在為了要改善傳統透鏡易受失焦干擾的這個目的下,我們使用了一個相位薄膜,使得影像對於失焦的干擾降低進而獲得改善,得到比較好的影像品質。波前理論就是在這個目的下被提出,波前理論就是在透鏡前面加了一道薄膜,藉此去改變影像的品質,來克服失焦的問題。
我們將論文中提出的新相位薄膜套用到光學影像系統上,得到了對應的光學轉移函數和模擬的影像。接著,我們模擬在不同的失焦程度下,將其和其他學者已發表的相位薄膜相作比較,我們的相位薄膜在光學轉移函數和影像上的表現有些許的勝出。
Abstract
In the imaging system, a blurred defocus image is a common problem. This is because different objects in the scene need different focus for imaging clearly. However, we can only have one focus distance in one picture. Therefore, the images of the other objects in different focus distance would be blurred by the faulty focuses.
We apply wave front coding to solve the above defocus problem. Wave front coding is a technique that adds a phase mask in front of the lens, changing the image performance, and solving the problem of defocus.
In this thesis, we used a new phase screen, computed accordingly its optical transfer function and then simulated the resulting images. We compared with other phase screens provided by other researchers for different defocus situations. From our results, our pupil and optical transfer function are slightly superior.
目次 Table of Contents
中文摘要 i
英文摘要 ii
誌謝辭 iII
目錄 iv
圖表目錄 vii
第1章 引言...............................................1
第2章 光學影像系統之基礎.................................4
2.1 同調之影像系統.....................................4
2.2 非同調之影像系統...................................6
2.3 同調轉移函數與OTF之間的關係......................7
第3章 多重焦距與光學轉移函數.............................9
3.1 失焦概論...........................................9
3.2 次方薄膜..........................................10
3.3 其他薄膜..........................................14
3.4 新薄膜............................................17
3.5 二階相位薄膜......................................24
第4章 實驗結果與分析....................................27
4.1 實驗的模型........................................27
4.2 自相關函數........................................28
4.3 實驗結果和比較....................................31
4.3.1 光學轉移函數和自相關函數.....................32
4.3.2 影像圖.......................................36
4.3.3 其他實驗結果.................................37
4.3.4 二階相位薄膜之結果...........................45
第5章 結論..............................................47
參考文獻.................................................49
參考文獻 References
參考文獻
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