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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 洪一平(Yi-Ping Hung) | |
dc.contributor.author | Wan-Yen Lo | en |
dc.contributor.author | 羅婉嫣 | zh_TW |
dc.date.accessioned | 2021-06-13T05:50:52Z | - |
dc.date.available | 2007-07-07 | |
dc.date.copyright | 2006-07-07 | |
dc.date.issued | 2006 | |
dc.date.submitted | 2006-07-05 | |
dc.identifier.citation | [1] E. H. Adelson and J. R. Bergen, “The plenoptic function and the elements of early vision.” M. Landy and J. A. Movshon, (eds) Computational Models of Visual Processing, 1991. [Online]. Available: citeseer.ist.psu.edu/adelson91plenoptic.html
[2] M. Levoy and P. Hanrahan, “Light field rendering.” in SIGGRAPH, 1996, pp. 31–42. [3] S. J. Gortler, R. Grzeszczuk, R. Szeliski, and M. F. Cohen, “The lumigraph.” in SIGGRAPH, 1996, pp. 43–54. [4] X. D´ecoret, F. Durand, F. X. Sillion, and J. Dorsey, “Billboard clouds for extreme model simplification.” ACM Trans. Graph., vol. 22, no. 3, pp. 689–696, 2003. [5] G. Schaufler, “Image-based object representation by layered impostors.” in VRST, 1998, pp. 99–104. [6] H.-Y. Shum, S. B. Kang, and S.-C. Chan, “Survey of image-based representations and compression techniques.” IEEE Trans. Circuits Syst. Video Techn., vol. 13, no. 11, pp. 1020–1037, 2003. [7] S. E. Chen, “Quicktime vr: an image-based approach to virtual environment navigation.” in SIGGRAPH, 1995, pp. 29–38. [8] S. M. Seitz and C. R. Dyer, “View morphing.” in SIGGRAPH, 1996, pp. 21–30. [9] J. Xiao and M. Shah, “From images to video: View morphing of three images.” in VMV, 2003, pp. 495–502. [10] H. C. Huang, S.-H. Nain, Y.-P. Hung, and T. Cheng, “Disparity-based view morphing -a new technique for image-based rendering.” in VRST, 1998, pp. 9–16. [11] Y.-P. Hung, C.-S. Chen, Y.-P. Tsai, and S.-W. Lin, “Augmenting panoramas with object movies by generating novel views with disparity-based view morphing.” Journal of Visualization and Computer Animation, vol. 13, no. 4, pp. 237–247, 2002. [12] P. E. Debevec, C. J. Taylor, and J. Malik, “Modeling and rendering architecture from photographs: A hybrid geometry-and image-based approach.” in SIGGRAPH, 1996, pp. 11–20. [13] D. N. Wood, D. I. Azuma, K. Aldinger, B. Curless, T. Duchamp, D. Salesin, and W. Stuetzle, “Surface light fields for 3d photography.” in SIGGRAPH, 2000, pp. 287–296. [14] W.-C. Chen, J.-Y. Bouguet, M. H. Chu, and R. Grzeszczuk, “Light field mapping: efficient representation and hardware rendering of surface light fields.” ACM Trans. Graph., vol. 21, no. 3, pp. 447–456, 2002. [15] W. Matusik, H. Pfister, A. Ngan, P. A. Beardsley, R. Ziegler, and L. McMillan, “Image-based 3d photography using opacity hulls.” in SIGGRAPH, 2002, pp. 427–437. [16] K. N. Kutulakos and S. M. Seitz, “A theory of shape by space carving.” in ICCV, 1999, pp. 307–314. [17] A. Laurentini, “The visual hull concept for silhouette-based image understanding.” IEEE Trans. Pattern Anal. Mach. Intell., vol. 16, no. 2, pp. 150–162, 1994. [18] C.-H. Ko, Y.-P. Tsai, Z.-C. Shih, and Y.-P. Hung, “A new image segmentation method for removing background of object movies by learning shape priors.” in Proc. IEEE Int’l Conf. Pattern Recognition, 2006. [19] G. Schaufler, “Per-object image warping with layered impostors.” in Rendering Techniques, 1998, pp. 145–156. [20] W. E. Lorensen and H. E. Cline, “Marching cubes: A high resolution 3d surface construction algorithm.” in SIGGRAPH ’87: Proceedings of the 14th annual conference on Computer graphics and interactive techniques. New York, NY, USA: ACM Press, 1987, pp. 163–169. [21] C. Madsen and R. Laursen, “A model-based approach to image relighting with a potential for real-time implementation.” in Proceedings: Vision, Video and Graphics, 2005, pp. 231–243. [22] I. Garcia, M. Sbert, and L. Szirmay-Kalos, “Leaf cluster impostors for tree rendering with parallax,” in Eurographics, 2005. [23] M. F. Tappen, W. T. Freeman, and E. H. Adelson, “Recovering intrinsic images from a single image.” IEEE Trans. Pattern Anal. Mach. Intell., vol. 27, no. 9, pp. 1459–1472, 2005. [24] S. K. Nayar, K. Ikeuchi, and T. Kanade, “Surface reflection: Physical and geometrical perspectives.” IEEE Trans. Pattern Anal. Mach. Intell., vol. 13, no. 7, pp. 611–634, 1991. [25] Y. Sato, M. D. Wheeler, and K. Ikeuchi, “Object shape and reflectance modeling from observation.” in SIGGRAPH, 1997, pp. 379–387. [26] S. A. Shafer, “Using color to separate reflection components,” pp. 43–51, 1992. [27] G. Klinker, S. Shafer, and T. Kanade, “A physical approach to color image understanding,” IJCV, vol. 4, no. 1. January 1990, pp. 7–38, January 1990. [Online]. Available: citeseer.ist.psu.edu/klinker90physical.html [28] K. Nishino, Z. Zhang, and K. Ikeuchi, “Determining reflectance parameters and illumination distribution from a sparse set of images for view-dependent image synthesis.” in ICCV, 2001, pp. 599–606. [29] K. E. Torrance and E. M. Sparrow, “Theory for off-specular reflection from roughened surfaces,” pp. 32–41, 1922. [30] Y.-Y. Chuang, B. Curless, D. H. Salesin, and R. Szeliski, “A bayesian approach to digital matting,” in Proceedings of IEEE CVPR 2001, vol. 2. IEEE Computer Society, December 2001, pp. 264–271. [31] D. P. Bertsekas, Constrained Optimization and Lagrange Multiplier Method. New York: Academic Press, Inc, 1982. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33989 | - |
dc.description.abstract | 為了讓虛擬物體可以更加廣泛的應用在生活中,我們提出了一個新的三維物體表示方式,讓描繪速度可以更快,但儲存容量更小。如此一來,在有限的資源下,三維虛擬物體就可以有效率地透過網路共享。表示三維物體的方法有很多,純模型式表示法與純影像式表示法皆行之有年,並各有優點,我們希望可以結合兩者的長處,並互補兩者的不足,達到更佳的描繪效果。我們首先提出了billboard cluster這種表示法,對三維模型做大幅度的簡化,但在簡化的同時保留原本的形狀。此外,我們在簡化後的模型上貼上對物體拍攝得到的影像,讓描繪效果更加逼真。在貼圖前,我們更進一步的對原本的影像做處理,先將光影變化抽掉,只保留物體原本的顏色當材質貼在模型上,因為如果光影部分沒有抽掉,每張影像的亮度分佈會不大相同,使描繪後的物體顏色不均。為了解決這個問題,我們先利用貝斯架構將問題公式化,藉著求得此公式的最佳解,我們便可以將物體原本的顏色與光線造成的影響分離。並且,因為我們使用物體原本的顏色貼圖,在描繪的同時,使用者可以對物體重新打光,再進一步將虛擬物體融合到不同的場景中。 | zh_TW |
dc.description.abstract | We introduce a new representation for 3D objects, aiming at real-time rendering and high compression ratio, so that the virtual objects could be more applicable to many real-world applications. Since both pure model-based and pure image-based approaches have particular merits, we try to take advantages from them both and to make the 3D geometry and acquired images complement with each other. To simplify the geometry for efficient rendering, we propose the idea of billboard clusters, which is a combination of billboard clouds and layered impostors. The simplified 3D model is then texture-mapped with the acquired images to achieve photo-realistic rendering effects. Furthermore, before texture mapping, the view-dependent lighting effects, shading and specular components, should be removed from the image sequence to ensure color-consistent outcome. We then formulate the diffuse-specular separation problem in a Bayesian framework, and solve the optimum albedo of each pixel with the maximum-a-posteriori technique. As a consequence, the the object is even able to be relighted under arbitrary illumination conditions. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T05:50:52Z (GMT). No. of bitstreams: 1 ntu-95-R93922050-1.pdf: 2091929 bytes, checksum: a578b5e9feca689d7ddb965d58a2419f (MD5) Previous issue date: 2006 | en |
dc.description.tableofcontents | 1 Introduction 1
2 Related Work 3 3 Overview 6 3.1 Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Billboard Clusters 10 4.1 Finding Primitive Billboard Cloud . . . . . . . . . . . . . . . . . . . . . 11 4.1.1 The grouping method . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1.2 Error measure for a point and a plane . . . . . . . . . . . . . . . 13 4.1.3 Finding a good plane for a group of points . . . . . . . . . . . . . 13 4.2 Layered Impostor Representation . . . . . . . . . . . . . . . . . . . . . . 14 4.3 Improving the Rendering Result . . . . . . . . . . . . . . . . . . . . . . . 16 4.4 Optimizing Texture Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5 Lighting Compensation 21 5.1 Reflection Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.2 Separating Reflection Components . . . . . . . . . . . . . . . . . . . . . 24 5.3 Recovering View-independent Reflectance Map . . . . . . . . . . . . . . . 26 5.3.1 Estimating Albedos and Reflection Parameters with MAP . . . . 27 5.3.2 Resulted Reflectance Maps and Comparisons . . . . . . . . . . . . 33 5.4 View-dependent Rendering . . . . . . . . . . . . . . . . . . . . . . . . . . 34 6 Implementation and Results 35 6.1 Under the Original Illumination Condition . . . . . . . . . . . . . . . . . 35 6.2 Under Arbitrary Illumination Conditions . . . . . . . . . . . . . . . . . . 38 7 Conclusion and Future Work 41 7.1 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 7.2 Future Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Bibliography 43 | |
dc.language.iso | en | |
dc.title | 適於快速描繪及壓縮的三維物體表示方式 | zh_TW |
dc.title | A Hybrid Representation of 3D Objects for Fast Rendering and Compression | en |
dc.type | Thesis | |
dc.date.schoolyear | 94-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 歐陽明(Ming Ouhyoung),張鈞法(Chun-Fa Chang),陳祝嵩(Chu-Song Chen),石勝文(Sheng-Wen Shih) | |
dc.subject.keyword | 影像式繪圖,影像式表示法,三維模型化簡,分離漫反射與鏡面反射成分, | zh_TW |
dc.subject.keyword | image-based rendering,image-based representation,model simplification,diffuse-specular separation, | en |
dc.relation.page | 46 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2006-07-06 | |
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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