1 التصوير الثلاثي الابعاد التصوير الثلاثي الابعاد )رسم المجسمات بناء على مجموعة من الصور الفوتوغرافية)

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1 التصوير الثلاثي الابعاد التصوير الثلاثي الابعاد )رسم المجسمات بناء على مجموعة من الصور الفوتوغرافية)

2 التصوير التماثلي ثلاثي الابعاد!! “ تصوير تجسيمي ثلاثي الابعاد ”  ليس تقنية جديدة بل هو معروف منذ اختراع الكاميرا التماثلية ( العادية).  هو عبارة عن كاميرا تماثلية ذات عدستين بزاويتين مختلفتين.  استخدم اسلوب دمج الصور لجعلها تبدو مجسمة.

3 دوافع استخدام هذه التقنيات: تحويل الاشياء الواقعية الى بيانات رقمية يمكن الاستفادة منها. عمل نماذج واقعية شخصيات ادوات مباني

4 (التصوير ثلاثي الابعاد) : تعريفات احيانا تسمى : “المسح الرقمي للأجسام” استخدام الضوء والظل في الصورة لشرح المظهر الحقيقي للأشياء المظهر == تفاصيل الاسطح (من مواد والوان وانعكاسات) النتيجة النهائية = نموذج ذو تفاصيل دقيقة

5 تطبيقات في المجالات الصناعية:  بناء البيئات الافتراضية.  الاتصالات المرئية  الاستخدامات الطبية  تصميم المنتجات برامج تستخدم في هذه التقنيات: Cyberware RD3030 Others (Geomagic, Metacreations, Cyrax, Geometrix…)

6 Chevette Project, Debevec, 1991 مثال على استخدامات الحاسب في صناعة الصور ثلاثية الابعاد:

7 بناء النماذج ثلاثية الابعاد من صورة واحدة: (Criminisi, 1999) يقوم البرنامج بحسابات لتوقع ابعاد الجسم في الصورة من خلال درجات الظلال وعمق الالوان. وفي مرحلة لاحقة يستخدم الحاسب اقل عدد ممكن من الاسطح لتعريف ابعاد ونسب الاجسام التي يراد ادخال الصور عليها.

8 Case study - Façade Debevec, Taylor & Malik, 1996 Modeling architectural scenes from photographs Not fully automatic (user inputs blocky 3D model)  Using blocks leads to fewer params in architectural models User marks corresponding features on photo Computer solves for block size, scale, camera rotation by minimizing error of corresponding features Reprojects textures from the photographs onto the reconstructed model

9 Modeling and Rendering Architecture from Photographs (Debevec, Taylor, and Malik 1996) Block Model User-Marked Edges Recovered Model

10 Arches and Surfaces of Revolution Taj Mahal modeled from one photograph

11 References [Bouguet98] Bouguet, J.-Y., P. Perona. 3D Photography on your Desk. In Proc. ICCV 1998 [Bouguet00] Bouguet, J.-Y. Presentation on Desktop 3D Photography, in SIGGRAPH course notes on 3D Photography, 2000 [Criminisi99] Criminisi, A., I. Reid and A. Zisserman. Single View Metrology. In Proc. ICCV, pp , September 1999 [Curless96] Curless, B. and M. Levoy. A Volumetric Method for Building Complex Models from Range Images. In Proc. SIGGRAPH 1996 [Debevec96] Debevec, P., C. Taylor and J. Malik. Façade - Modeling and Rendering Architectural Scenes from Photographs. In Proc. SIGGRAPH 1996 [Debevec00a] Debevec, P. Presentation on the Façade, from SIGGRAPH course notes on 3D Photography, 1999, [Debevec00b] Debevec, P., T. Hawkins, C. Tchou, H.P.Duiker, W. Sarokin and M. Sagar. Acquiring the Reflectance Field of a Human Face. In Proc. SIGGRAPH 2000.

12 More References [Horn70] Horn, B.K.P. Shape from Shading : A Method for Obtaining the Shape of a Smooth Opaque Object from One View. Ph.D. Thesis, Dept of EE, MIT, [Kutulakos98] Kutulakos, K. N. and S. Seitz. A Theory of Shape by Space Carving. URCS TR#692, May 1998, appeared in Proc. ICCV [Levoy96] Levoy, M. and P. Hanrahan. Light Field Rendering. In Proc. SIGGRAPH [Levoy00a] Levoy, M., Pulli, K., Curless, B. et al. The Digital Michelangelo Project - 3D Scanning of Large Statues. In Proc. SIGGRAPH [Levoy00b] Levoy, M. Presentation on the Digital Michelangelo Project, in SIGGRAPH course notes on 3D Photography, [Seitz97] Seitz & Dyer. Photorealistic Scene Reconstruction by Voxel Coloring. In Proc. CVPR 1997, pp

13 Still More References [Seitz00] Seitz, S. SIGGRAPH course notes on 3D photography, 1999, [Szeliski93] Szeliski, R. Rapid Octree Construction from Image Sequences. CGVIP : Image Understanding, vol. 58, no. 1, pp 23-32, [Wood00] Wood, D., D. I. Azuma, K. Aldinger, B. Curless, T. Duchamp, D.H. Salesin and W. Stuetzle. Surface Light Fields for 3D Photography. In Proc. SIGGRAPH [Woodham80] Woodham, R. Photometric Stereo for Determining Surface Orientation from Multiple Images. Journal of Optical Engineering, vol. 19, no. 1, pp , [Yu99] Yu, Y., P. Debevec, J. Malik and T. Hawkins. Inverse Global Illumination - Recovering Reflectance Models of Real Scenes from Photographs.