請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44512完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳炳宇(Bing-Yu Chen) | |
| dc.contributor.author | Hsin-Yi Chen | en |
| dc.contributor.author | 陳心怡 | zh_TW |
| dc.date.accessioned | 2021-06-15T03:02:09Z | - |
| dc.date.available | 2009-08-03 | |
| dc.date.copyright | 2009-08-03 | |
| dc.date.issued | 2009 | |
| dc.date.submitted | 2009-07-30 | |
| dc.identifier.citation | [1] H.G. Barrow and J.M. Tenenbaum. Recovering intrinsic scene characteristics from
images. Computer Vision Systems., pages 3–26, 1978. [2] R. Basri, D. Jacobs, and I. Kemelmacher. Photometric stereo with general,unknown lighting. International Journal of Computer Vision, pages 239–257, 2007. [3] Hernandez C, G. Vogiatzis, and R. Cipolla. Shadows in three-source photometric stereo. European Conference on Computer Vision, pages 290–303, 2008. [4] M. Chandraker and S. Aqarwal ans D. Krieqman. Shadowcuts: Photometric stereo with shadows. Computer Vision and Pattern Recognition, 2007. [5] P. Debevec, C. Tchou, A. Gardner, T. Hawkins, C. Poullis, and J. stum. Estimating surface reflectance properties of a complex scene under captured natural illumination. [6] K. Hayakawa. Photometric stereo under a light source with arbitrary motion. Journal of the Optical Society of America. [7] D. Hoiem, A.A. Efros, and M. Hebert. Automatic photo pop-up. ACM Transactions on Graphics [Proc. SIGGRAPH]), year = 2005, volume= 24, number= 3, pages = 577-584. [8] C. Julia, A.D. Sappa, F. Lumbreras, J.Serrat, and A. Lopez. Recovery of surface normals and reflectance from different lighting conditions. Proceedings of the 5th international conference on Image Analysis and Recognition, pages 315–325, 2008. [9] D.D. Lee and H.S. Seung. Algorithm for non-negative matrix factorization. Advanced in Nerual Information Processing Systems, pages 556–562, 2001. [10] C.-J. Lin. Projected gradient methods for non-negative matrix factorization. Neural Computation, pages 2745–2779, 2007. [11] W. Matusik, M. Loper, and H. Pfister. Progressively-refined reflectance functions from natural illumination. Eurographics Symposium on Rendering, 2004. [12] J. Nimeroff, E. P. Simoncelli, and J. Dorsey. Efficient re-rendering of naturally illuminated environments. In Fifth Annual Eurographics Symposium on. [13] E. Reinhard, M. Adhikhmin, B. Gooch, and P. Shirley. Color transfer between images. Computer Graphics and Application, IEEE, 21:34–41, 2001. [14] M.Petrou S. Barsky. The 4-source photometric stereo technique for threedimensionalsurfaces in the presence of highlights and shadows. IEEE Transactions on Pattern Analysis and Machine Intelligence, 25(10), 2003. [15] K. Sunkavalli, W. Matusik, H. Pfister, and S.Rusinkiewiez. Factored time-lapse video. ACM Transactions on Graphics (Proc. SIGGRAPH), (3), 2007. [16] L. Tao, L. Yuan, and J. Sun. Skyfinder: Attribute-based sky image search. ACM Transactions on Graphics, [Proc. SIGGRAPH], 2009. [17] Greg Ward. Fast,robust image registration for compositing high dynamic range photographs from hand held exposures. journal of graphics, gpu, and game tools,8(2):17–30. [18] Y. Weiss. Deriving intrinsic images from image sequences. International Conference on Computer Vision, 2, 2001. [19] R.J. Woodham. Photometric method for determining surface orientation from multiple images. Optical Engineering, 19(1):139–144, 1980. [20] Y. Yu and J. Malik. Recovering photometric properties of architectural scenes from photographs. ACM Transactions on Graphics,[Proc. SIGGRAPH], pages 207–218, 1998. [21] A.L. Yullie, D. Snow, R.Epstein, and P.N. Belhumeur. Determining generative models of objects under varying illumination : Shape and albedo from multiple image using svd and integrability. International Journal of Computer Vision, pages 203–222, 1999. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/44512 | - |
| dc.description.abstract | 室外場景不同的光影呈現, 往往帶給觀賞的人不一樣的視覺感受.
但是在很多狀況下,我們對場景所拍攝的照片不一定能捕捉到我們想要 的光線. 在這篇論文中,我們提供了一套轉換場景光線的系統,不需要真實的物理 反射模型或事先獲得場景的3D資訊,而得以對場景中的光線進行轉換. 我們利用拍攝不同光源方向,但是同樣視角的室外場景影片,利用非負矩 陣分解, 還原出場景的法向量,可能的物理反射模型以及光源的方向和 強度. 利用求得的幾何參數和另外一組場景的光源方向和強度, 我們可 以將不同光源的特性轉換到我們想要改變光源的場景上, 合成擬真的繪 圖. v | zh_TW |
| dc.description.abstract | Lighting makes a significant perceptual impact on visual perception,
but our photo are sometimes captured during rather bother lighting condition. We propose a method to transfer lights from one outdoor scene to another by using sequences of time-varying videos taken from both scenes. Our algorithm first detect shadow area for each image. We consider pixels in shadow as unreliable data, then using an iterative photometric stereo framework with non-negative matrix factorization method to compute geometry term and lighting term of the scene. The factorization result allows users to easily relight the scene by transfer lighting from user specified lighting model to the target image. We demonstrate via several examples that our method generates good results and keep color consistency | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T03:02:09Z (GMT). No. of bitstreams: 1 ntu-98-R96922129-1.pdf: 2880836 bytes, checksum: 11ac9000d6adb01d9f1d9ce3118d46cc (MD5) Previous issue date: 2009 | en |
| dc.description.tableofcontents | 口試委員審定書
致謝 中文摘要 Abstract 1 Introduction 1 1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Problem statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Related Work 5 2.1 Time-lapse sequence analysis . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Photometric stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Relighting of outdoor scene . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 Overview 9 4 Video Processing 13 4.1 Sky Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 Frame extraction and Alignment . . . . . . . . . . . . . . . . . . . . . . 14 4.3 Lighting Clustering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5 Model Formulation 17 5.1 Lambertian Surface Model . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.2 Orientation From Colour . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.2.1 Photometric Stereo Using Factorization . . . . . . . . . . . . . . 18 5.3 Matrix Factorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.3.1 Non-negative Matrix Factorization . . . . . . . . . . . . . . . . . 23 5.4 Problem Formulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6 Algorithm 25 6.1 Shadow Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.2 First Factorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.2.1 Surface Normal and Light Direction Estimation . . . . . . . . . . 32 6.3 Second Factorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6.3.1 Surface Albedo Estimation . . . . . . . . . . . . . . . . . . . . . 34 6.3.2 Light Intensity Estimation and Normalization . . . . . . . . . . . 34 6.4 Synthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.4.1 Sky Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.4.2 Relighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 7 Result 37 8 Conclusion and Future work 45 8.1 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 8.2 Future work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Bibliography 47 | |
| dc.language.iso | en | |
| dc.subject | 計算攝影學 | zh_TW |
| dc.subject | 影像式描繪 | zh_TW |
| dc.subject | 逆向問題 | zh_TW |
| dc.subject | inverse problem | en |
| dc.subject | image-based rendering | en |
| dc.subject | computational photography | en |
| dc.title | 時間變化影片之光線轉移使用非負矩陣分解 | zh_TW |
| dc.title | Lighting Transfer via Non-negative Matrix Factorization for
Time-varying Video | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 97-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳祝嵩,張鈞法 | |
| dc.subject.keyword | 影像式描繪,逆向問題,計算攝影學, | zh_TW |
| dc.subject.keyword | image-based rendering,inverse problem,computational photography, | en |
| dc.relation.page | 49 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2009-07-30 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 資訊工程學研究所 | zh_TW |
| 顯示於系所單位： | 資訊工程學系 | |
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| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-98-1.pdf 未授權公開取用 | 2.81 MB | Adobe PDF |
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