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???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
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dc.contributor.advisor | 蘇國棟 | |
dc.contributor.author | Yuan-Heng Chien | en |
dc.contributor.author | 簡元亨 | zh_TW |
dc.date.accessioned | 2021-06-14T16:42:17Z | - |
dc.date.available | 2010-08-04 | |
dc.date.copyright | 2008-08-04 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-07-31 | |
dc.identifier.citation | [1] http://www.capv.com/home/Multiclient/MobileImaging.html
[2] http://mobilementalism.com/2006/11/12/whose-camera-phone-takes-the-best-pictures-part-1-nokia/ [3] Lijun Zhu, pang-Chen Sun, Dirk-Uwe Bartsch, William R. Freeman, and Yeshaiahu Fainman, “Adaptive control of a micromachined continuous-membrane deformable mirror for aberration compensation”, APPLIED OPTICS / Vol. 38, No. 1 / 1 January 1999 [4] Claire Max, “Introduction To Adaptive Optics And Its History”, American Astronomical Society 197th Meeting [5] Denis Broussean, Ermanno F. Borra and Simon Thibault, “Wavefront correction with a 37-actuator ferrofluid deformable mirror”, OSA / OPTICS EXPRESS 18191 / Vol.15, No.26 / 24 December 2007 [6] Eui-Hyeok Yang, Krill Shcheglov and Susan Trolier-McKinstry, “Concept, Modeling and Fabrication Techniques for Large-Stroke Piezoelectric Unimorphy Deformable Mirrors”, SPIE / Vol.4983 / 2003 [7] Nathan Doble, Geunyoung Yoon, Li Chen, Paul Bierden, Ben Singer, Scott Oliver, David R Williams, “Use of a microelectromechanical mirror for adaptive optics in the human eye”, OPTICS LETTERS / Vol. 27, No.17 / September 1, 2002 [8] Raymond V. Wick, Adjunct Research Staff Member, “The Developing Science & Technologies List (DSTL)”, SPIE / Vol.6294 62940V-1 / 2006 [9] Jen-Liang Wang, “Compact Imaging System with Deformable Mirror – Auto-focusing & Zooming”, Graduate Institute of Electro-Optical Engineering National Taiwan University Master Thesis / 2007.06 [10] Seung Hun Jin, Jung Uk Cho and Jae Wook Jeon, “FPGA based Passive Auto Focus System using Adaptive Thresholding”, SICE-ICASE / 89-950038-5-5 98560 / 2006 [11] Ng Kung Chern,Nathaniel, Poo Aun Neow, Marcelo H.Ang Jr., “PRACTICAL ISSUES IN PIXEL-BASED AUTOFOCUSING FOR MACHINE VISION”, IEEE International Conference on Robotics 8 Automation/ 0-7803-6475-9 / 2001 [12] Kang-Sun Choi, Jun-Suk Lee, and Sung-Jae Ko, “NEW AUTOFOCUSING TECHNIQUE USING THE FREQUENCY SELECTIVE WEIGHTED MEDIAN FILTER FOR VIDEO CAMERA”, IEEE / Manuscript received / June 28, 1999 [13] Schlag, J. E, A. C. Sanderson, C. P. Neumann, and E C.Wimberly, “Implementation of Automatic Focusing Algorithms for a Computer Vision System with Camera Control”, Technical Report CMU-RI-TR-83- 14, Carnegie Mellon University, August, 1983. [14] Tenenbaum, J. M.,” Accommodation in Computer Vision”, Ph.D. Dissertation, Stanford University. November, 1970. [15] Davies, E.R., “Machine Vision: Theory, Algorithms”, Practicalities. Academic Press Limited / 1990. [16] S. K. Nayar and Y. Nakagawa, “Shape from focus”, IEEE Pans.Pattern Analysis and Machine Intelligence / vol. 16, pp. 824-831 / Aug. 1994 [17] Jarvis, R. A., “Focus Optimization Criteria for Computer Image Processing”, Microscope 24(2), 1976, pp. 163- 180. [18] Schlag, J. E, A. C. Sanderson, C. P. Neumann, and E C. Wimberly, “Implementation of Automatic Focusing Algorithms for a Computer Vision System with Camera Control”, Technical Report CMU-RI-TR-83- 14, Carnegie Mellon University, August, 1983. [19] Krotkov, Eric Paul, “Active Computer Vision by Cooperative Focus and Stereo” New York: Springer-Verlag. 1989. [20] Jie He, Rongzhen Zhou, and Zhiliang Hong, “Modified Fast Climbing Search Auto-focus Algorithm with Adaptive Step Size Searching Technique for Digital Camera”, IEEE Contributed Paper / 0098 3063 / April 3, 2003 [21] J. H.’Lee, K. S. Kim, B. D. Nam,” Implementation of a passive automatic focusing algorithm for digital Still camera”, IEEE Trans. On Consumer Electronics / Vo1.41, No.3, pp.449-454 / Aug. 1995. [22] Beveridge, G. S., Schechter, R. S., “Optimization: Theory and Practice”, McGraw-Hill, New York. 1970. [23] Ching-Wei Liu, Hsin-Ta Hsieh, Shi-Chang Tseng, An-Yi Cheng, Wei-Yao Hsu, Guo-Dong Su, “Compact Reflective Type Auto-focusing Imaging System with Polymer Deformable Mirror” [24] http://www.videologyinc.com/cameras/ccd-board-camera-20Z404-22X.htm [25] www.physorg.com/news1207.html [26] http://www.varioptic.com/en/tech/technology01.php [27] www.livingroom.org.au/photolog/2004/09/index.php [28] http://www.semicon.toshiba.co.jp/eng/product/sensor/selection/topic/1177795_2460.html [29] www.mso.anu.edu.au/rnao/research/index.shtml | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/40183 | - |
dc.description.abstract | 照像手機已經成為現今手機市場的主流。因為照像手機的容易取得以及普遍性,許多人會使用照相手機來拍攝一些生活中令人難忘的畫面,現今照像手機所使用的照相模組也因此不斷的進行改進期望達到更好的成像品質以及更小的體積,為了提高照相模組的拍攝品質,許多的電子功能都會搭配於照相模組之中,例如:自動對焦、影像縮放、以及電子白平衡,而在這些電子功能當中,又屬自動對焦最為基本及普遍。
傳統的照相模組是採用移動模組內透鏡的方式來改變整個系統的焦距,而移動透鏡的方式則是會利用馬達來調整透鏡相對於CCD感測器的位置,而成像的對焦程度也會因此產生變化。雖然這種移動透鏡的方式在現行的自動對焦照相模組中最為盛行,但是這種模組卻因為必須預先保留透鏡移動的空間而造成整體模組的體積難以縮小。 在這篇論文中我們提出了一種採用可行變鏡面來改變整體模組的焦聚的方式來實現自動對焦的功能,並且根據這個可行變鏡面的物理及光學特性來設計整個模組及控制的方法。其中控制的方法是根據計算影像對焦程度以及搜尋影像對焦成度最大值的演算法來進行程式的撰寫,最後,我們會實際利用LabVIEW®和MATLAB®這兩個程式撰寫平台來設計出一套自動對焦系統,用來控制這個利用可行變鏡面來變焦的光學模組。 | zh_TW |
dc.description.abstract | Camera phones are the main stream of today’s mobile phone market. Because of the generality and accessibility of camera phones, people usually use camera phones to record the rememberable moments of their life instead of digital cameras. The camera modules that are used in camera phones are improved to have better image quality and smaller size. There are lots of electronic functions, such as auto-focusing, zooming, and white-balance, that are armed in today’s camera phones in order to provide better image quality. Among these electronic functions, auto-focusing is the most common and basic one.
Conventional optical design in auto-focusing camera modules adopts the way that moving the lens to adjust the focal length of the whole camera module. Motors are attached in camera modules to change the position of lens, which will alter the image sharpness of the image that formed on the CCD sensor. Although the moving-lens method is the most popular fashion of auto-focusing camera modules, the size of the whole module is hard to reduce. This problem stemmed from the reserved space in which lens is moved. The broader variation of module’s focal length, the longer space has to be reserved. Thus, it seems hard to look after miniaturization and image quality of conventional auto-focusing camera modules. In this thesis, we discuss an innovative optical design of auto-focusing camera module, which use deformable mirror to adjust the focal length of the whole module. Besides, based on the physical and optical properties of deformable mirror, the controlling method, which is according to the principles of image-sharpness computation and searching algorithm, is explained in this research. Finally, we experimentally demonstrated the controlling method of this auto-focusing optical system using LabVIEW® and MATLAB®. As a result, an innovative auto-focusing camera module has been designed, prototyped, and controlled. | en |
dc.description.provenance | Made available in DSpace on 2021-06-14T16:42:17Z (GMT). No. of bitstreams: 1 ntu-97-R95941037-1.pdf: 4920431 bytes, checksum: a0f2cc56ca26dbf192655233284aa7bc (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 致謝 I
中文摘要 II Abstract III Contents V List of Figures VII List of Tables X Chapter 1: Introduction 1 Chapter 2: Deformable mirror 2.1 Review of deformable mirror 5 2.2 Physical & optical properties of used deformable mirrors 2.2.1 Physical properties 7 2.2.2 Optical properties 12 Chapter 3: Auto-focusing 3.1 Introduction of auto-focusing methods 15 3.2 Sharpness functions 3.2.1 Definitions of sharpness functions 16 3.2.2 Accuracy analysis of sharpness functions 20 3.2.3 Focusing window and thresholds of sharpness functions 23 3.2.4 Comparison of the computation time of different sharpness functions 26 3.3 Searching algorithm 3.3.1 Global searching method and Fibonacci searching method 30 3.3.2 Percentage-drop searching 32 3.3.3 Adaptive-step-size technique 34 Chapter 4: Optical design and simulation of the auto-focusing camera module 4.1 Optical design 37 4.2 Simulation 41 Chapter 5: Realization of the deformable-mirror based auto-focusing camera system 5.1 Prototype of the optical system 46 5.2 Introduction of the controlling program 48 5.3 Experiment setup 53 5.4 Experiment results 55 Chapter 6: Conclusion 6.1 Summary 58 6.2 Future work 58 References 60 Appendix A 64 Appendix B 72 | |
dc.language.iso | en | |
dc.title | 可形變鏡面於自動對焦光學系統之控制方法 | zh_TW |
dc.title | The Controlling Method of Deformable Mirror used in Auto-focusing Optical System | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林晃嚴,蔡睿哲 | |
dc.subject.keyword | 可形變鏡面,自動對焦,光學設計, | zh_TW |
dc.subject.keyword | deformable mirror,auto-focusing,optical design, | en |
dc.relation.page | 63 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2008-08-01 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
Appears in Collections: | 光電工程學研究所 |
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ntu-97-1.pdf Restricted Access | 4.81 MB | Adobe PDF |
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