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研究生： 洪哲詠
Hung, Che-Yung
論文名稱： 攝影機襄助之多投影畫面融合系統技術
Camera-assisted Calibration Techniques for Merging Multi-projector Systems
指導教授： 楊家輝
Yang, Jar-Ferr
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電腦與通信工程研究所
Institute of Computer & Communication Engineering
論文出版年： 2011
畢業學年度： 99
語文別： 英文
論文頁數： 72
中文關鍵詞： 大螢幕 、投影機畫面融合 、亮度校正 、顏色修正 、無縫接合
外文關鍵詞： large screen, multi-projector systems, luminance balance, color balance, merge overlapped region
相關次數： 點閱：139  下載：7 
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    • 隨著世代的演進，人們對於大螢幕的要求越來越高，但能提供如此高解析度之投影機通常要價不斐。因此投影機畫面融合技術提供了低成本，以及可實現在短距離取得大投影尺寸的方法，除此之外，此技術還可提供特殊投影尺寸，以及特殊投影形狀（如環場投影）等要求。
    本論文的主要研究，是希望以純軟體，不需再多加裝額外硬體的方式，解決多投影機融合時會遇到的投影機之間亮度校正，顏色修正，重疊區域無縫接合，投影區域大小不同等問題。且將現行的演算法簡化，使其在播放影片時也能達到即時（real-time）的效果。我們相信，此方法相比於利用硬體解決得方法，可以達到低成本、泛用性高，且容易使用等目的。

    In recent years, if people want to show images for a large group of people, they often use a large screen instead giving audience individual monitor to display. But it is too expensive to use the largest size liquid crystal display (LCD) only up to 152 inches. Instead, for the large size, we suggest to use several projectors.
    In this research, we want to achieve multi-projector systems just by software without any special hardware device. We can use this software to solve problems such as how to achieve luminance balance and color balance between different projectors, merge overlapped region seamlessly, and resize different size of projection screen of different projectors. Besides, we also simplify the traditional algorithm, so we can play the video in real time. We also believe that the proposed software-based multi-projector systems can achieve the many goals such as low cost, high universal usage, and easy to use for real applications.

    Chapter 1 Introduction 1 1.1 Motivation……………………………………………………………........2 1.2 overview of multi-projector system ......................................................2 1.2.1 Luminance mismatch……………….……………...……………………3 1.2.2 Color mismatch………………………………………………………….3 1.2.3 Overlapped region……………………………………………………...4 1.2.4 Surface distortion……………………………………………………......5 1.3 Organization of this paper………………………………………………….6 Chapter 2 System overview 7 2.1 Related work………………………………………………………………...7 2.1.1 LAM(Luminance value Attenuation Map )...............................................7 2.1.2 Alpha blending…………………………………………………………10 2.1.3 Bilinear interpolation…………………………………………………...14 2.2 Hardware system…………………………………………………………..14 2.3 Flow chart of the systems…………………………………………..……...15 2.4 User interface of the systems……………………..……………………….17 2.5 Background………………………………………………………………...17 Chapter 3 Geometric calibration 20 3.1 Geometric correction for horizontal line……………………..…..………21 3.1.1 System overview………………………………………………….....21 3.1.2 Divide overlapped region………………….…...…………………..22 3.1.3 Match lines………………..…………………………………………22 3.1.4 Record parameters…………………………………...………………24 3.1.5 Bilinear interpolation…...……………………………………………25 3.2 Geometric correction for vertical lines…………………………..……..24 3.2.1 System overview………………………..…………………………25 3.2.2 Define parameters………………………………………………….25 3.2.3 Resize projection screen………………………..………………….26 3.2.4 Select mode………………………………………………………..26 3.2.5 Modify image……………………………………………………...28 3.3 Summary……………………………………………...…………………....28 Chapter 4 Photometric calibration 30 4.1 luminance balance………………………………………………………....30 4.1.1 System overview…………………………………………………….31 4.1.2 Define parameters…………………………...……………………….31 4.1.3 Geometric calibration………………………………..………………32 4.1.4 Data Capture for Luminance value Correction……………...………33 4.1.5 Generate MLAM………………………………………….…………34 4.1.6 Image Modification………………………………………………...35 4.1.7 Half luminance balance………………………………………35 4.1.8 Summary…………………………………………………………….37 4.2 Linear color match………………………………………………………39 4.2.1 System overview…………………………………………………….39 4.2.2 Color match loop…………………………………………………….41 4.2.3 Linear interpolation…………………………………………………44 4.2.4 Summary…………………………………………………………….45 4.3 Edge blending……………………………………………………………47 4.3.1 System overview…………………………………………………….47 4.3.2 Crossover equalization……………………………………………..50 4.3.3 Region modify curve………………………………………………52 4.3.4 Smooth…………………………………………………….............55 4.3.5 Summary…………………………………………………………..57 4.4 Photometric calibration loop………………………………………….....59 Chapter 5 Experimental Result and Discussion 60 5.1 Experimental results..................................................................................60 5.1.1 Experimental results of single color input…………...….62 5.1.2 Experimental results of colorful image………………….63 Chapter 6 Conclusions and Future works 68 6.1 Conclusions 68 6.2 Future works……………………….……………………………………69 References 70 作者簡歷 72

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