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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳宏銘 | |
| dc.contributor.author | Tai-Hsiang Huang | en |
| dc.contributor.author | 黃泰翔 | zh_TW |
| dc.date.accessioned | 2021-06-08T07:13:32Z | - |
| dc.date.copyright | 2008-08-04 | |
| dc.date.issued | 2008 | |
| dc.date.submitted | 2008-07-30 | |
| dc.identifier.citation | [1] I. Choi, H. Shim, and N. Chang, “Low-power color TFT LCD display for hand-held embedded systems,” in Proc. ISLPED, Monterey, California, pp. 112-117, 2002.
[2] “TFT-LCD structure,” 2002, http://www.auo.com/auoDEV/?ls=en. [3] “A diagram of the pixel layout,” Nov 2006, http://en.wikipedia.org/wiki/Thin_film_transistor_liquid_crystal_display. [4] H.R. Blackwell, “Contrast thresholds of human eye, ”Journal of Optical Society of America, Vol. 11, no. 36, Nov 1946. [5] H. Wilson, “A transducer function for threshold and suprathreshold human vision,” Biological Cybernetics vol. 38, pp. 171–178, 1980. [6] M. J. Flynn, J. Kanicki, A. Badano, and W.R. Eyler, “High-fidelity electronic display of digital radiographs,” RadioGraphics, vol. 19, pp. 1653-1669, 1999. [7] F. Gatti, A. Acquaviva, L. Benini, and B. Ricco', “Low power control techniques for TFT LCD displays,” in Proc. CASES, Grenoble, France, pp. 218-224, 2002. [8] A. Iranli, W. Lee, and M. Pedram, “HVS-aware dynamic backlight scaling in TFT-LCDs,” IEEE Trans. Very Large Scale Integration Systems, vol. 14, pp. 1103–1116, Oct. 2006. [9] L. Cheng, S. Mohapatra, M. E. Zarki, N. Dutt, and N. Venkatasubramantan, “A backlight optimization scheme for video playback on mobile devices,” in Proc. CCNC, Las Vegas, Nevada, pp. 833-837, Jan. 2006. [10] F. Durand, and J. Dorsey, “Fast bilateral filtering for the display of high-dynamic-range images, ”ACM Trans. on Graphics, vol. 21, no. 3, pp. 257-266, 2002. [11] S. N. Pattanaik, J. A. Ferwerda, M. D. Fairchild, and D. P. Greenberg, “A multiscale model of adaptation and spatial vision for realistic image display, ”Proc. of SIGGRAPH, pp. 287-298, 1998. [12] R. Mantiuk, K. Myszkowski, and H. P. Seidel, “A perceptual framework for contrast processing of high dynamic range images,” ACM Trans. on Applied Perception, vol. 3, no. 3, pp. 286-308, 2006. [13] J. Tumblim., J.K. Hodgins, and B.K. Guenter, “A boundary hierarchy for de-tail-preserving contrast reduction,” in Siggraph Computer Graphics Proceedings, pp. 83-90, 1999. [14] E. Reinhard, M. Stark, P. Shirley, and J. Ferwerda, ”Photographic tone reproduction for digital images,” ACM Trans. on Graphics, vol. 21, no. 3, pp. 267-276, 2002. [15] R. Fattal, D. Lischinski, and M. Werman, “Gradient domain high dynamic range compression,” ACM Trans on Graphics, vol. 21, no. 3, 2002. [16] P. S. Tsai, C. K. Liang, and H. H. Chen, “Image quality enhancement for low backlight TFT–LCD displays,” Int. Conf. Image Proc, 2007. [17] W. C. Cheng, Y. Hou, and M. Pedram, “Power minimization in a backlit TFT-LCD display by concurrent brightness and contrast scaling,” in Proc. Conf. Design, Automation and Test in Europe, pp. 10252-10259, Feb. 2004. [18] Z. Wang and A. C. Bovik, “A universal image quality index,” IEEE Signal Processing Letters, vol. 9, pp. 81-84, Mar. 2002. [19] G. Krawczyk, K. Myszkowski, H. P. Seidel, “Contrast restoration by adaptive countershading”, Proc. of Eurographics, 2007. [20] F. Kingdom, B, Moulden, “ Border effects on brightness: a review of findings, models and issues,” Spatial Vision, vol. 3, no. 4, pp.226-262, 1988. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/26521 | - |
| dc.description.abstract | 保持不同環境光下的影像可視性一直是可攜式電子設備在設計上所面臨的問題。本篇研究針對電子設備所提供之背光亮度小於環境光亮度造成影像無法清楚呈現的問題提出了有效的影像增強演算法。該演算法的訣竅主要在於將影像的亮度控制在人眼可辨識的範圍。在影像亮度範圍壓縮的過程中，我們發現相較於原本較暗區域儘量維持原本較亮區域的對比度的方法能有效的保留影像的感知對比度。在實踐此方法的過程中，我們利用JND的理論將影像分成亮度和感知強度兩個圖層。接著我們將增加亮度層中較暗部分的亮度已達到增加整張影像可視度之目標。實驗結果證實，本篇研究所提出之方法可有效的運作於背光10%的實際環境下。 | zh_TW |
| dc.description.abstract | Maintaining image quality under various lighting conditions is critical to portable multimedia devices. In this thesis, an image enhancement algorithm is proposed to deal with extremely dim LCD backlight under which the image often becomes imperceptible. The crux of our idea is to keep the detail content of the image in the visible luminance range. To do that, just noticeable difference (JND) theory is used to form a two-layer image decomposition architecture for extracting the details, and a boosting scheme is applied to the details that are in the low intensity luminance regions of the image. Experimental results have shown the superiority of the proposed algorithm. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T07:13:32Z (GMT). No. of bitstreams: 1 ntu-97-R95942037-1.pdf: 3303709 bytes, checksum: 8db4b89200c93722a6ff08dcaae08358 (MD5) Previous issue date: 2008 | en |
| dc.description.tableofcontents | Contents
ABSTRACT xiii CHAPTER 1 INTRODUCTION 1 1.1 Problem statement 2 1.2 Image processing 3 1.3 Contribution 4 1.4 Organization of the Study 5 CHAPTER 2 BACKGROUND AND RELATED WORK 7 2.1 Digital display device 7 2.1.1 Structure of TFT-LCD panel 8 2.1.2 LCD Lighting Theory 11 2.1.3 Backlight Sources 12 2.1.4 Backlight Scaling 13 2.2 Physiology background 14 2.2.1 Just Noticeable Differences Theory 15 2.2.2 HVS Response 17 2.2.3 Brightness Adaptation 18 2.3 Literature Review 19 2.3.1 Gradient Domain Method 20 2.3.2 ABIE 21 2.3.3 QABS 23 2.3.4 Iranli’s Method 24 2.4 Image Assessment Metrics 25 2.4.1 MSE 26 2.4.2 Universal Quality Index 26 CHAPTER 3 METHODOLOGY-JND-BASED ENHANCEMENT OF PERCEPTIBILITY 29 3.1 Observations 29 3.2 Key Idea 31 3.3 Approach 34 3.3.1 JND Decomopsition 34 3.3.2 Dark Region Luminance Boosting 37 3.3.3 Color Restoration 39 3.3.4 Halo Effect Reduction 39 CHAPTER 4 EXPERIMENTAL RESULTS 47 4.1 Simulation result 47 4.2 Implementation 57 CHAPTER 5 CONCLUSION 61 | |
| dc.language.iso | en | |
| dc.subject | 影像增強 | zh_TW |
| dc.subject | 液晶螢幕背光 | zh_TW |
| dc.subject | LCD backlight | en |
| dc.subject | JND | en |
| dc.subject | contrast | en |
| dc.subject | image enhancement | en |
| dc.title | 低液晶螢幕背光下之影像增強技術 | zh_TW |
| dc.title | Perceptibility Enhancement of LCD Images Under Dim Backlight | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 96-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 貝蘇章,陳良基,葉素玲,簡韶逸 | |
| dc.subject.keyword | 液晶螢幕背光,影像增強, | zh_TW |
| dc.subject.keyword | LCD backlight,image enhancement,contrast,JND, | en |
| dc.relation.page | 67 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2008-07-30 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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|---|---|---|---|
| ntu-97-1.pdf 未授權公開取用 | 3.23 MB | Adobe PDF |
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