Voicu Popescu Associate Professor of Computer Science Computer Graphics and Visualization Lab 305 North University Street West Lafayette, IN 47907-2107 popescu@cs.purdue.edu Office: LWSN 3179 Tel: (765) 494-6010 Fax : (765) 494-0739
Teaching - Spring 2012: CS 17700
Projects
Model Camera: Real-Time Modeling from Dense Color and Sparse Depth The ModelCamera is a fast, easy to use, and inexpensive 3D scene modeling system. The ModelCamera acquires dense color (720x480 video frames) augmented with sparse depth (7x7 to 11x11 depth samples). The frames are registered and merged into an evolving model at the rate of five frames per second. The model is displayed continually to provide immediate operator feedback.
Superimages: Image Generalization through Camera Model Design Images are used in computer graphics and visualization to convey information. Images are computed by sampling data with rays defined by a camera model. Most images used in computer graphics and visualization are computed using the planar pinhole camera model, which suffers from important limitations such as uniform sampling rate, and single viewpoint. We propose to overcome these limitations through camera model design, an infrastructure-level innovation with broad applicability, including in 3-D scene exploration, remote visualization, acceleration of high-cost rendering effects, and video surveillance.
Effective Distance Learning through Sustained Interactivity and Visual Realism The goal is to research, implement, deploy and assess a distance learning system that extends the real classroom to accommodate remotely located students. The system will convey to both remote and local participants a strong sense that the remote participants are actually present in the classroom.
High-Fidelity Visualization of Large-Scale Simulations The goal of our team was to produce a visualization of the September 2001 attack on the Pentagon. The immediate motivation for the project was to understand the behavior of the building under the impact. The longer term motivation was to establish a path for producing high-quality visualizations of large scale simulations. For this we created a reusable and scalable link between the worlds of computer simulation and computer animation.
Study of Shape Perception Using Volumetric 3D Images We study 3D shape perception using a volumetric 3D display that allows several users to observe simultaneously a sculpture of light without the disadvantages of uncomfortable eyewear, jittery trackers, rendering pipeline latency, and strenuous vergence and accommodation. A secondary goal of this project is to evaluate this alternative display technology.
Publications Journals (some also presented at conferences) Non-Pinhole Approximations for Interactive Rendering. Paul Rosen, Voicu Popescu, Kyle Hayward, and Chris Wyman. IEEE Computer Graphics and Applications, Volume 31, Issue 6, November-December 2011, pp. 68-83. An Evaluation of 3-D Scene Exploration Using a Multiperspective Image Framework. Paul Rosen and Voicu Popescu. The Visual Computer Volume 27, Numbers 6-8, pp. 623-632. Also presented at Computer Graphics International 2011. A Curved Ray Camera for Handling Occlusions through Continuous Multiperspective Visualization. Jian Cui, Paul Rosen, Voicu Popescu, and Christoph Hoffmann. IEEE Transactions on Visualization and Computer Graphics, vol. 16, no. 6, November/December 2010, pp. 1235-1242. Also presented at IEEE Visualization 2010. The General Pinhole Camera. Voicu Popescu, Paul Rosen, Laura Arns, Chris Wyman, Xavier Tricoche, Tion Thomas, Christoph Hoffmann. IEEE Transactions on Visualization and Computer Graphics, vol. 16, no. 5, September/October 2010, pp. 777-790. The Graph Camera. Voicu Popescu, Paul Rosen, and Nicoletta Adamo-Villani. ACM Transactions on Computer Graphics, article number 158, 2009. Also presented at SIGGRAPH Asia 2009. Compact Real-Time Modeling of Seated Humans by Video Sprite Sequence Quantization. Chun Jia and Voicu Popescu. The Visual Computer, Volume 25, Numbers 5-7, April 2009. Also presented at Computer Graphics International 2009. A High-Quality High-Fidelity Visualization of the September 11 Attack on the World Trade Center. Paul Rosen, Voicu Popescu, Christoph Hoffmann, and Ayhan Irfanoglu. IEEE Transactions on Visualization and Computer Graphics, Vol. 14, Issue 4, August 2008. 1001 Acquisition Viewpoints—Efficient and Versatile View-Dependent Modeling of Real-World Scenes. Mihai Mudure and Voicu Popescu. The Visual Computer, Volume 24, Numbers 7-9, July 2008. Also presented at Computer Graphics International 2008. Virtual Classroom Extension for Distance Education. Radu Dondera, Chun Jia, Voicu Popescu, Cristina Nita-Rotaru, Melissa Dark, Cynthia York. IEEE Computer Graphics and Applications, Volume 28, Issue 1, January-February 2008. CAD Visualization by Outsourcing. Voicu Popescu and Christoph Hoffmann. Journal of Computer-Aided Design and Applications, vol. 4, nos 1-4, 2007. Occlusion-Resistant Camera Design for Acquiring Active Environments. Daniel Aliaga, Yi Xu, and Voicu Popescu, vol. 277, no. 5, September-October 2007. Perception of Surfaces from Line Drawings. Christoph Hoffmann, Zygmunt Pizlo, Voicu Popescu, and Steve Price. Elsevier Journal Displays, Volume 28, Issue 1, February 2007. Reflected-Scene Impostors for Realistic Reflections at Interactive Rates. Voicu Popescu, Chunhui Mei, Jordan Dauble, and Elisha Sacks. Computer Graphics Forum, Vol. 25., issue 3, 2006. Also presented at Eurographics 2006. Efficient Large-Scale Acquisition of Building Interiors. Gleb Bahmutov, Voicu Popescu, and Mihai Mudure. Computer Graphics Forum, Vol. 25., issue 3, 2006. Also presented at Eurographics 2006. Three-Dimensional Display Rendering Acceleration Using Occlusion Camera Reference Images. Voicu Popescu, Paul Rosen, and Daniel Aliaga. IEEE/OSA Journal of Display Technology, 2006. Forward Rasterization. Voicu Popescu and Paul Rosen. ACM Transactions on Computer Graphics, 25(2), April 2006. The ModelCamera. Voicu Popescu, Gleb Bahmutov, Elisha Sacks, and Mihai Mudure. Elsevier Journal of Graphical Models, Volume 68, Issues 5-6, September-November 2006, pp 385-401. Sample-Based Cameras for Feed Forward Reflection Rendering. Voicu Popescu, Elisha Sacks, and Chunhui Mei. In IEEE Transactions on Visualization and Computer Graphics, Nov-Dec, 2006, pp 1590-1600. Study of the Perception of 3D Spatial Relations for a Volumetric Display. Christoph Hoffmann, Zygmunt Pizlo, Voicu Popescu, and Paul Rosen. SPIE Journal of Electronic Imaging, Vol. 15, No. 3, July-September 2006, pp 033002-1-033002-8. The Occlusion Camera. Chunhui Mei, Voicu Popescu, and Elisha Sacks. Computer Graphics Forum, Vol. 24, issue 3, 2005. Also presented at Eurographics 2005. Fidelity in Visualizing Large-Scale Simulations. Voicu Popescu and Christoph Hoffmann. Journal of Computer Aided Design, Elsevier, 37 (2005), pp 99-107. The Pentagon on September 11th. Christoph Hoffmann, Voicu Popescu, Sami Kilic and Mete Sozen. IEEE Computing in Science and Engineering, January/February 2004, pp 52-60. The WarpEngine: An Architecture for the Post-Polygonal Age. V. Popescu, J. Eyles, A. Lastra, J. Steinhurst, N. England, and L. Nyland. Proceedings of SIGGRAPH 2000 pages 433-442, July 23-29, 2000. Images for Accelerating Architectural Walkthroughs. Matthew Rafferty, Daniel Aliaga, Voicu Popescu, Anselmo Lastra. IEEE Computer Graphics and Applications, Nov-Dec 1998 Issue, pages 38-45, 1998. Conferences Interactive Photorealistic Inside-Looking-Out Automated 3-D Modeling. Voicu Popescu and Mihai Mudure. In Proceedings of Interservice/Industry Training, Simulation, and Education Conference (I/ITSEC), 2008. General-Purpose Visualization of Large-Scale Finite Element Analysis Simulations. Voicu Popescu and Christoph Hoffmann. In Proceedings of Interservice/Industry Training, Simulation, and Education Conference (I/ITSEC), 2008. The Epipolar Occlusion Camera. Paul Rosen and Voicu Popescu. In Proceedings of ACM Symposium on Interactive 3D Graphics and Games, 2008. The Soft Shadow Occlusion Camera. Qi Mo, Voicu Popescu, and Chris Wyman. In Proceedings of Pacific Graphics 2007. Evaluating interactivity and presence in an online distance learning system. Melissa Dark, Cynthia York, Voicu Popescu, Cristina Nita-Rotaru. In ASEE/IEEE Proceedings of Frontiers in Education, Milwaukee, WI, 2007. A Hybrid Forward-Backward Method for Rendering Reflections. Chunhui Mei, Voicu Popescu, and Elisha Sacks. In Proceedings of International Conference on Computer Graphics, Theory, and Applications, March 2007. A Multi-Expertise Application-Driven Class. Cristina Nita-Rotaru, Melissa Dark, and Voicu Popescu. In Proceedings of Technical Symposium on Computer Science Education, SIGCSE 2007. An Efficient Error-Bounded General Camera Model. Voicu Popescu, Jordan Dauble, Chunhui Mei, and Elisha Sacks. In Proceedings of Third International Symposium on 3D Data Processing Visualization and Transmission, 2006. The Depth Discontinuity Occlusion Camera. Voicu Popescu and Dan Aliaga. Proc. of ACM Symposium on Interactive 3D Graphics and Games, 2006. The Lag Camera. Yi Xu, Daniel Aliaga, and Voicu Popescu. In Proceedings of International Conference on Computer Graphics, Theory, and Applications, February 2006. Depth Enhanced Panoramas. Gleb Bahmutov, Voicu Popescu, Mihai Mudure, and Elisha Sacks. In Proc. of Video Vision and Graphics (VVG) 2005. Interactive Modeling from Dense Color and Sparse Depth. Voicu Popescu, Elisha Sacks, and Gleb Bahmutov. Symposium on 3D Data Processing, Visualization, and Transmission (3DPVT) 2004. Perception of 3D spatial relations in 3D images. Paul Rosen, Christoph Hoffmann, Voicu Popescu, Zygmunt Pizlo. IS&T/SPIE 16th International Symposium Electronic Imaging: Science and Technology 2004. Interactive Point-Based Modeling from Dense Color and Sparse Depth. Voicu Popescu, Elisha Sacks, and Gleb Bahmutov. In Proc. of International Symposium on Point-Based Graphics (PBG) 2004. Challenges and Advances in Interactive 3D Modeling. Voicu Popescu, Elisha Sacks, and Aliasgar Ganiji. IS&T/SPIE 16th International Symposium Electronic Imaging: Science and Technology 2004. Producing High-Quality Visualizations of Large-Scale Simulations. Voicu Popescu et al. In Proc. of IEEE Vis 2003. The ModelCamera: A Hand-Held Device for Interactive Modeling. Voicu Popescu, Elisha Sacks, and Gleb Bahmutov. In Proc. of International Conference on 3D Imaging and Modeling (3DIM) 2003. The Vacuum Buffer. Voicu Popescu, Anselmo Lastra. Proceedings of 2001 Symposium on Interactive 3D Graphics, Chapel Hill, 2001. Capturing, Processing and Rendering Real-World Scenes. L. Nyland, A. Lastra, D. McAllister, V. Popescu, C. McCue. Proc. of Videometrics and Optical Methods for 3D Shape Measurement, Electronic Imaging 2001, Photonics West, San Jose, 2001. Sort-first parallelism for Image-Based Rendering. Voicu Popescu, Anselmo Lastra, John Eyles. Proc. of the 3 rd Eurographics Workshop on Parallel Graphics and Vis. (Girona, Spain), pp. 93-101, Sept. 28-29, 2000. Interactive exploration of acquired 3D data. L. Nyland, D. McAllister, V. Popescu, C. McCue, and A. Lastra. Proceedings of the SPIE Applied Image and Pattern Recognition Conference, October 13-15, 1999. The Impact of Dense Range Data on Computer Graphics. L. Nyland, D. McAllister, V. Popescu, C. McCue, A. Lastra et al. Proceedings of Multi-View Modeling and Analysis Workshop, June 23-26, 1999. Real-Time Rendering of Real-World Environments. D. McAllister, L. Nyland, V. Popescu, A. Lastra, C. McCue. Proceedings of the Eurographics Workshop on Rendering, June 21-23, 1999. Efficient Warping for Architectural Walkthroughs using Layered Depth Images. V. Popescu, A. Lastra, D. Aliaga, M. Oliveira. In Proceedings of IEEE Visualization '98, pages 211 - 215, Oct18-23, 1998.