RESEARCH


	I'm a Ph.D. graduate student of the Computer Science Department, a Distinguished Presidential Fellow at Columbia University, and also a member of Columbia Automated Vision Environment and Rendering Laboratory. My advisors are Prof. Shree K. Nayar and Prof. Ravi Ramamoorthi.

*RESEARCH INTEREST* Computer Graphics, Computer Vision, Physical Simulation, Applied Mathematics
PUBLICATIONS
*-Journal-* Frequency Domain Normal Map Filtering - New! Charles Han, Bo Sun, Ravi Ramamoorthi, and Eitan Grinspun ACM SIGGRAPH 2007 [Abstract] [Paper] [Video] [Shader] Time-Varying BRDFs Bo Sun, Kalyan Sunkavalli, Ravi Ramamoorthi, Peter Belhumeur and Shree Nayar IEEE Transactions on Visualization and Computer Graphics [Abstract] [Database] [Paper] [Video] Real-Time Soft Shadows in Dynamic Scenes using Spherical Harmonic Exponentiation Zhong Ren, Rui Wang, John Snyder, Kun Zhou, Xinguo Liu, Bo Sun, Peter-Pike Sloan, Hujun Bao, Qunsheng Peng and Baining Guo ACM SIGGRAPH 2006 [Abstract] [Paper] [Video] A Practical Analytic Single Scattering Model for Real Time Rendering Bo Sun, Ravi Ramamoorthi, Srinivasa Narasimhan and Shree Nayar ACM SIGGRAPH 2005 [Abstract] [ Summary] [Paper] [Video] [Slides] [2D Tables] [Prefiltered Envmaps] [Sample Shader] [Maya Plug-in] [Gallery] *-Conference-* Time-Varying BRDFs Bo Sun, Kalyan Sunkavalli, Ravi Ramamoorthi, Peter Belhumeur and Shree Nayar Eurographics 2006 Workshop on Natural Phenomena [Abstract] [Database] [Paper] [Video] [Slides] Structured Light in Scattering Media Srinivasa Narasimhan, Shree Nayar, Bo Sun and S.J. Koppal IEEE ICCV 2005 [Abstract] [Paper] [Video] Directional Histogram Model for Three-dimensional Shape Similarity Xinguo Liu, Bo Sun, Sing Bing Kang and Harry Shum IEEE CVPR 2003 [Abstract] [Summary] [Paper]
MISC. PROJECTS
	Real-time Stereo algorithm using GPU In the area of Computer Vision, stereo vision is a fundamental problem, which has a wide range of applications. The problem of determining feature correspondences across multiple views is considered. I first combine the space-sweep approach and the novel use of commodity graphics hardware for real-time view-synthesis by implementing the method introduced in Ruigang Yang's SIGGRAPH02 paper. The method estimate a dense depth map from the current viewpoint. pixels. But this result is rather coarse and unpleasing due to the fact of occlusion and shadows. Thus I combined the simple and efficient shift window (S. B. Kang et al.) and Neighboring View Cooperate method to refine the result, which can significantly reduce noise, sharpen the edge and thus enhance accuracy.