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Image Quality Improving System for Indoor Full Color LED Panel
|關鍵字:||亮度均勻性;Brightness Uniformity;發光二極體;亮度檢測;Light-Emitting Diode;Brightness Inspection||出版社:||電機工程學系所||引用:|| Ming-Jong Tsai, Shu-Huai Chabg, Chia-Loang Lee, Chia-Te Chou, “Color Quality Inspection and Compensation for Color LED Display Modules” , International Conference on Machine Learning and Cybernetics, vol. 4, pp.1720-1725, July 2011.  Feng Chang, Rui-guang Wang, Xi-feng Zheng, Tie-fu Ding, “Algorithm of Reducing the Non-uniformity of Images in LED Display Panel”, International Conference on Applied Physics and Industrial Engineering, vol. 24, pp. 918-925, March 2012.  Zhi-yuan Sun, Feng Chang, Rui-guang Wang, Xi-feng Zheng, “Gray level Correction Algorithm of LED Display Panel Based on Least squares Approximation”, International Conference on Computer, Mechatronics, Control and Electronic Engineering, vol. 5, pp. 126-129, Aug 2010.  葉書佑, “Study of Luminance Uniformity Inspection and Compensation Mechanism for Color Light Emitting Diode Display Module”, 台灣科技大學自動化及控制研究所, 碩士論文, 2007.  Yueh-Ru Yang, “Brightness control of LED lamps using fuzzy logic controllers”, IEEE Conference Industrial Electronics and Applications (ICIEA), pp. 1957-1962, June 2010.  F. Nguyen , “Challenges in the design of a RGB LED display for indoor applications”, Synthetic Metals, Volume 122, Number 1, 1 May 2001 , pp. 215-219.  Ziquan Zhao, Ruiguang Wang, “An accuracy requirement analysis for LED brightness and color correction system”, International Conference on Transportation, Mechanical, and Electrical Engineering, pp. 962-965, Dec 2011.  S. Harris, “Color and luminance uniformity correction for LED video screens”, Signindustry.com, vol. 8, Issue 20, 2007.  A. A. Garetner, “LED Measurement Issues”  Phil Downen, “A Closer Look at Flat-Panel-Display Measurement Standards and Trends”, Information Display, pp.16-21, Jan. 2006.  Hai-Jung In, Kyong-Hwan Oh, Oh-Kyong Kwon, Chang Ho Hyun, Sung-Chul Kim, “A luminance adjusting algorithm for high resolution and high image quality AMOLED displays of mobile phone applications”, IEEE Transactions on Consumer Electronics, vol. 56, Issue. 3, pp.1191-1195, Aug. 2010.  Faundez-Zanuy, M., Espinosa-Duro, V., Ortega, J.A., “A low-cost Webcam & personal computer opens doors”, IEEE Aerospace and Electronic Systems Magazine, vol. 20, pp.23-26, Nov. 2005.  Oh, P.Y., “A template for real-time image processing development: Windows-based PCs and webcams for computer vision research and education”, IEEE Robotics & Automation Magazine, vol. 12, Issue 4, pp. 65-74, Dec. 2005.  Chang-Jung Juan, Ming-Jong Tsai, “A voltage-compensated driver for lighting PMOLEDs panels”, IEEE Transactions on Consumer Electronics, vol. 49, Issue 2, pp. 263-268, May 2003.  柯宗誼, “The Study of Optic Inspection and Luminance Compensation for Organic Electro Luminescence Panels”, 台灣科技大學自動化及控制研究所, 碩士論文, 2005.  Chang-Jung Juan, Ming-Jong Tsai , Chien-Hui Chou, “Controller with an Area Compensated Look-Up-Table for Improving the Luminance Uniformity on Lighting Passive Matrix Organic Light Emitting Diode Panels”, IEEE International Conference on Mechatronics and Automation, pp. 583-588, June 2006.  于明奎, “The study of optical uniformity quality parameter optimization for the LED color display module”, 台灣科技大學自動化及控制研究所, 碩士論文, 2008.  Ming-Jong Tsai, Kai-Sheng Wang, Ming-Hung Li, Shu-Huai Chang, “Implementation of Array-Based Optical Inspection Device and Uniformity Compensation for LED Display Modules”, Journal of Technology, Vol. 24, No. 3, pp. 205-212, 2009.  周彥幟, “Color Correction for the Surrounding Full-Color LED Display System”, 聯合大學電機工程學所, 碩士論文, 2009  VESA, “Flat Panel Display Measurements Standard Version 2.0”.  Pietro Fiorentin, Paola Iacomussi, Giuseppe Rossi, “Characterization and Calibration of a CCD Detector for Light Engineering”, IEEE Transactions on Instrumentation and Measurement, Vol. 54, N0. 1, February 2005.  Allen Jong-Woei Whang, Yi-Yung Chen, Yuan-Ting Teng, “Designing Uniform Illumination Systems by Surface-Tailored Lens and Configurations of LED Arrays”, Journal of Display Technology, Vol. 5, No. 3, March 2009.  Zhang Yi, Liu Xu, Li Haifeng, “A Study on Correction Systemic Algorithm for LCD Projection Display Color Uniformity”, International Conference on Medical Physics and Biomedical Engineering, pp. 1540-1546, 2012.  http://en.wikipedia.org/wiki/Light-emitting_diode  Rafael C. Gonzalez, Richard E, Woods, Steven L. Eddins, “Digital Image Processing Using Matlab, 1st Edition”, Prentice Hall, 2004.||摘要:||
近年來，隨著LED(Light-Emitting Diode)發光二極體技術的成熟，使其被普遍的運用於日常生活中，而室內用全彩LED Panel(以下簡稱LED Panel)就是其中的一項重要應用。由於LED Panel具有高亮度、省電、反應速度快等優勢，而被廣泛的應用在現代商用展場或演唱會等場合，以提供廣告或其他即時資訊。然而，因LED Panel都是由最小單位的一塊LED模組(LED Module)開始組成，不同區塊的LED Module之間恐衍生亮度不均勻的問題，即使由同樣的廠商同樣的工廠所生產的LED Module，這樣的問題也難以避免。因此，提升LED Panel亮度均勻性乃是近年來相當重要的課題之一。本研究提出以低成本webcam網路攝影機，結合PC個人電腦，建立一個PC Base為基礎的LED Panel亮度均勻性校正平台，促使LED Panel亮度均勻性的提升與良率的提高。
In recent years, as the LED(Light-Emitting Diode) technology is getting more mature, it is generally applied in the daily lives, and the indoor full-color LED Panel(LED Panel) is one of the most important applications. Due to the LED Panel has some edges such as high brightness, energy-saving, and quick response, it is widely applied to some commercial exhibition venues or concerts to provide pieces of advertisement or other instant information. However, every LED Panel is composed of the minimum units, LED Modules. Different LED Modules might have the brightness non-uniformity problem which cannot be avoided even by using the LED Modules made by the same manufacturer and at the same factory. Therefore, how to promote the brightness uniformity of the LED Panel has become one of the crucial prerequisites. This research uses a low-cost webcam connecting with a pc to set up an LED Panel brightness uniformity correction platform based on PC Base to boost the rise of the LED Panel brightness uniformity and the fall of the defective rate.
At first, chapter one introduces the rationale of LED and the reason why the LED Panel fails to meet the standard for brightness uniformity and the affection of the problem. To improve the brightness non-uniformity, a feedback calibration mechanism is established by using the webcam to shoot the LED image and make it regulate automatically to fix this problem. Furthermore, related literature reviews are also listed in this chapter.
The Image Processing Technique used in this research will be discussed in Chapter two. With the help of the Image Processing Techniques introduced, the brightness of the LED Panel is able to be captured and examined for its uniformity.
Chapter three further introduces existent detection technology standard and the calibration method the research uses.
In chapter four, the experiment results are presented to verify the feasibility of the calibration method. Collected from the experiment results, the brightness uniformity of the LED Panel is by far improved than it was calibrated and thus presents a better image quality.
In the last chapter, the conclusion is made and the possible methods of the amendments are brought up in accordance with each experiment results.
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