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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27573完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 傅楸善(Chiou-Shann Fuh) | |
| dc.contributor.author | Wei Hsu | en |
| dc.contributor.author | 徐緯 | zh_TW |
| dc.date.accessioned | 2021-06-12T18:10:20Z | - |
| dc.date.available | 2007-12-21 | |
| dc.date.copyright | 2007-12-21 | |
| dc.date.issued | 2007 | |
| dc.date.submitted | 2007-10-23 | |
| dc.identifier.citation | [1]B. E. Bayer, “Color Imaging Array,” US Patent #3971065, 1976.
[2]Dpreview, “Sony Announce New RGBE CCD,” http://www.dpreview.com/news/0307/03071601sonyrgbeccd.asp, 2006. [3]G. K. Wallace, “The JPEG Still Picture Compression Standard,” http://white.stanford.edu/~brian/psy221/reader/Wallace.JPEG.pdf, 1991. [4]S. C. Pei and I. K. Tam, “Effective Color Interpolation in CCD Color Filter Array Using Signal Correlation,” IEEE Transactions on Circuits and Systems for Video Technology, Vol.13, No. 6, pp. 503-513, 2003. [5]R. M. Haralick and L. G. Shapiro, Computer and Robot Vision, Vol. I, Addison Wesley, Reading, MA, 1992. [6]N. K. Chern, N. P. A. Neow, and M. H. Ang, Jr., “Practical Issues in Pixel-Based Auto-Focusing for Machine Vision,” Proceedings of the IEEE International Conference on Robotics and Automation, Seoul, Vol. 3, pp. 2791-2796, 2001. [7]J. He, R. Zhou, and Z. Hong, “Modified Fast Climbing Search Auto-focus Algorithm with Adaptive Step Size Searching Technique for Digital Camera,” IEEE Transactions on Consumer Electronics, Vol. 49, No. 2, pp. 257-262, 2003. [8]K. S. Choi, J. S. Lee, and S. J. Ko, “New Autofocus Technique Using the Frequency Selective Weighted Median Filter for Video Cameras,” IEEE Transactions on Consumer Electronics, Vol. 45, No. 3, pp. 820-827, 1999. [9]J. S. Lee, Y. Y. Jung, B. S. Kimm and S. J. Ko, “An Advanced Video Camera System with Robust AF, AE, and AWB Control,” IEEE Transactions on Consumer Electronics, Vol. 47, No. 3, pp. 694-699, 2001. [10]J. Weintroub, M.D. Aronson, and E. B. Cargill, “Method and Apparatus for Detecting Optimum Lens Focus Position,” U.S. Patent #0117514, 2003. [11]J. H. Lee et al., “Implementation of a Passive Automatic Focusing Algorithm for Digital Still Camera,” IEEE Transactions on Consumer Electronics, Vol. 41, No. 3, pp. 449-454, 1995. [12]N. Kehtarnavaz and H. J. Oh, “Development and Real-Time Implementation of a Rule-Based Auto-Focus Algorithm,” Journal of Real-Time Imaging, Vol. 9, Issue 3, pp. 197-203, 2003. [13]C. H. Chang, “Auto Focus Using Adaptive Step Size Search and Zoom Tracking Algorithm,” Master Thesis, Department of Computer Science and Information Engineering, National Taiwan University, 2005. [14]W. Hsu, and C. S. Fuh, “A New Sampling Method of Auto Focus for Voice Coil Motor in Camera Modules,” IEEE Pacific-Rim Symposium on Image and Video Technology, Hsinchu, Taiwan, pp. 1254-1263, 2006. [15]W. Hsu, “Gaussain Noise in DSLR,” http://homepage.ntu.edu.tw/~p94922001/, 2006. [16]Texas Instruments, “TMS320DM320 Image Peripherals Vol-1b,” Technical Reference Manual, Ver. 1.4, 2005. [17]Core Logic, “Image Signal Processor,” http://www.corelogic.co.kr, 2007. [18]NuCore, “Image Processor,” http://www.nucoretech.coml , 2007. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27573 | - |
| dc.description.abstract | 我們在這篇論文提出峰值偵測自動對焦用一個新的有效及有效率的取樣表給手機相機。許多的自動對焦演算法基於清晰度值的曲線，但是他們並沒有考慮到取樣位置與影像的特性。我們的取樣表是由影像校正而來的，它符合光學鏡片、感測器響應、雜訊、以及清晰度函數的加成結果。在一個三百萬畫素的手機相機中，此表可將搜尋步數由 404 步減少到 16 步，影像仍然保持清晰。在搜尋中的峰值偵測能夠避免雜訊的干擾即使影像是在低對比的狀況下。更進一步，它能輕易地應用於影像晶片或是手機相機上。 | zh_TW |
| dc.description.abstract | We present an auto focus method with peak detection by a new, effective, and efficient sampling table for phone cameras. Many auto focus algorithms base on focus value curves, and they do not consider the correlation between sampling and image characteristic. Our table is calibrated by images to meet results of optical lens, sensor response, noise, and focus value function. In a 3 mega-pixels camera, the table reduces total steps from 404 to 16, and captured images are still sharp. Proposed peak detection in a search can avoid noisy interference even though scenes are lower contrast. For further progress, they can be applied to image processing chips or mobile phones easily. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-12T18:10:20Z (GMT). No. of bitstreams: 1 ntu-96-P94922001-1.pdf: 2046285 bytes, checksum: 46ff6e66e85589e020f39b7e4abef32f (MD5) Previous issue date: 2007 | en |
| dc.description.tableofcontents | Chapter 1 Introduction 1
1.1 Digital Camera Processing with Auto Focus 2 1.1.1 Image Sensors 2 1.1.2 Color Filter Array 2 1.2 Image Pipeline 3 1.2.1 A Generic Image Pipeline 3 1.2.2 Image Pipeline and Sharpness 4 1.3 Auto Focus Problems 8 1.4 Image Signal Processors 9 1.4.1 Core Logic Cl31W 9 1.4.2 NuCore SiP-1280 10 Chapter 2 Focus Value Functions 10 2.1 Definition 11 2.2 Functions of Gray-Level Domain 11 2.2.1 Gray-Level Energy 12 2.2.2 Gray-Level Amplitude 12 2.2.3 Gray-Level Variance 12 2.2.4 Sum-Modulus-Difference 13 2.3 Functions of Spatial-Filter Domain 13 2.3.1 Tenengrad Filter 14 2.3.2 Laplacian Filter 14 2.3.3 Infinite Impulse Response Filter 15 2.4 Functions of Frequency Domain 15 2.4.1 Discrete Cosine Transform 15 2.4.2 Fast Fourier Transform 16 2.5 Functions of Probability Domain 16 2.5.1 Huffman Code Length 16 2.6 Summary of Focus Value Functions 17 Chapter 3 Focus Sampling 18 3.1 Focus Value Curves 18 3.2 Window Segment 19 3.3 Step Size 21 3.4 Sampling Tables 22 3.5 Noise and Focus Value Curve 24 3.5.1 Gaussian Noise and Focus Value Curve 24 3.5.2 Impulse Noise and Focus Value Curve 27 Chapter 4 Proposed Method 30 4.1 The Sampling Table 30 4.2 Search by Peak Detection 33 Chapter 5 Experimental Results 35 5.1 Experimental Environment 35 5.1.1 The Experimental Camera Module 35 5.1.2 Evaluated Module and ISP 36 5.1.3 Hardware Engines 37 5.2 Setup Summary 38 5.3 The Parameters and Sampling Table 39 5.4 Time Improvement 40 5.5 Accuracy Comparison 41 Chapter 6 Conclusion and Future Work 43 References 44 | |
| dc.language.iso | en | |
| dc.title | 自動對焦的一個新取樣方法於手機相機 | zh_TW |
| dc.title | A New Sampling Method of Auto Focus for Camera Phones | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 奚正寧(Chen-Ning Hsi),邱哲寬(Che-Kuan Chiu) | |
| dc.subject.keyword | 自動對焦,清晰度值,手機相機,音圈式馬達, | zh_TW |
| dc.subject.keyword | Auto focus,Focus value,Phone camera,Voice coil motor, | en |
| dc.relation.page | 45 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2007-10-23 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電機工程學研究所 | zh_TW |
| 顯示於系所單位： | 電機工程學系 | |
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|---|---|---|---|
| ntu-96-1.pdf 目前未授權公開取用 | 2 MB | Adobe PDF |
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