Hujun Bao

		Hujun Bao Professor, Computer Graphics Group Address: State Key Lab of CAD&CG, Zhejiang University, Hangzhou, 310027, China Phone: +86-571-87951045 Fax: +86-571-87951780 Email: bao@cad.zju.edu.cn Web: http://www.cad.zju.edu.cn/home/bao

	I received my Bachelor Degree in 1987 and Ph. D degree in 1993, both from applied mathematics of Zhejiang University. In August 1993, I joined State Key Lab of CAD&CG, Zhejiang University.

Realistic Image Synthesis (1991~1997)
	My researches on realistic image synthesis mainly focus on extended shading models and fast rendering algorithms. Based on a unified shading model, three analytical shading models for linear, curve and polygonal light sources are proposed to calculate local surface intensity. These shading models are further incorporated in our fast ray tracing algorithm with space subdivision scheme and radiosity algorithm for planar scenes. We also developed radiosity algorithms for general scenes with curved surfaces using finite element technique.
Realtime Rendering Technique (1997~present)
	Visibility determination is a key problem to realtime rendering complex scenes. To improve the interaction rates of large size of scenes, the potential visible set (PVS) and visibility simplification technique are combined to reduce the visibility complexity of scenes in each cell at preprocessing phase. By dynamically simplifying the scene into a set of range images, we design a distributed realtime walkthrough system, in which an image warping algorithm and a camera predictor are developed to synthesize the image of any view. Note that PVSs are expensive to store and load, a more compact representation, called global occlusion map (GOM), is designed for our realtime rendering system. The global visibility sampling theory indicates a conservative sampling rate for a view cell and how to sample the cell to acquire the visibility information. Lately, we also devise point and polygon based hybrid rendering algorithms for realtime rendering complex scenes.
Digital Geometry Processing (1998~present)
	3D geometry is becoming a new type of medium after sound, images and video. Digital geometry processing is still a challenging problem in computer graphics since it is difficult to process the surface attributes of meshes in a unified way. By introducing barycentric constraints into the multiresolution Laplacian relaxation process, a constrained mesh fairing algorithm is proposed for smoothing complex meshes. The volume preserved mesh smoothing algorithm can achieve better results. The 3D morphing algorithm can perform shape transformation between two closed polyhedra with the same genus using local parameterization technique. The algorithm is further extended using variational interpolation to handle arbitrary polyhedra. Recently, a unified processing framework is proposed for digital signal processing over arbitrary meshes. Within this framework, all surface attributes can be processed in a unified way. A geometric signal processing toolkit is designed for many applications. In the toolkit, many geometry operations, such as filtering, enhancement, convolution, editing, compression, watermarking, texture mapping etc., are included.
Field-based Surface Modeling (1999~present)
	To create models with complex shapes quickly is a hard task in computer graphics. Compared to parameter representation, implicit representation has many advantages in modeling complex shapes. Based on geometric constraints, cubic algebraic curves can be easily constructed like parametric curves. The continuous scalar field based freeform modeling technique provides users a method to conveniently construct complex models with polyhedral skeletons. The contour based modeling algorithm represents the object from a sequence of images in a distance field, from which the object can be extracted.

		Kun Zhou, Hujun Bao, Jiaoying Shi, Qunsheng Peng Framework for Digital Signal Processing Over Arbitrary Meshes Submission (Abstract) (Acrobat, 35 MB)
		Kun Zhou, Hujun Bao, Xinguo Liu et al. Geometric Signal Compression Submission (Abstract) (Acrobat, 34 MB)
		Wei Hua, Hujun Bao, Qunsheng Peng Global Visibility Sampling Submission (Abstract) (Acrobat, 2.29 MB)
		Zhongding Jiang, Hujun Bao, LiZhuang Ma Synthesizing High Resolution Images from Real Video Submission (Abstract) (Acrobat, 1.91 MB)
		Xingguo Liu, Hujun Bao, Harry Shum, Qunsheng Peng Volume Constrained Smoothing Method for Meshes Accepted by Graphical Models. (Abstract) (Acrobat, 2.89 MB)
		Ying Tang, Jin Wang, Hujun Bao, Qunsheng Peng RBF-based Texture Mapping Accepted by Computers & Graphics (Abstract) (Acrobat, 2.2 MB)
		Xiang Fang, Hujun Bao, PhengAnn Heng, et al. Continuous Field Based Free-Form Surface Modeling and Morphing Computers & Graphics, 2001, 25(3) (Abstract) (Acrobat, 439 KB)
	Wei Hua, Hujun Bao, Qunsheng Peng Hierarchical Surface Fragments Accepted by Progress in Natural Science.
	Jin Wang, Hujun Bao, Weihua Zhou, Qunsheng Peng, Yingqing Xu Automatic Image-Based Pencil Sketch Rendering Journal of Computer Science & Technology, Vol.17, No.3, 2002
	Jinhui Chen, Sanyuan Zhang, Hujun Bao, Qunsheng Peng G³ Continouous Curve Modeling with Rational Cubic Bezier Spline Progress in Natural Science, No.3, 2002
	Lanfang Miao, Xinguo Liu, Qunsheng Peng, Hujun Bao BRDC: Binary Representation of Displacement Code for Line Computers & Graphics, No.3, 2002
	Sanyuan Zhang, Hujun Bao, Baogang Wei Cubic Algebraic Curve Based on Geometric Constraints Computer Aided Geometric Design, 2001, 18:299-307
	Xingguo Liu, Hujun Bao，PhengAnn Heng，et al. Constrained Multiresolution Fairing for Meshes Computer Graphics Forum, 2001, 20(2) (Abstract) (Acrobat,35M)
	Xingguo Liu, Hujun Bao，Qunsheng Peng Noise Removal Algorithm for Polygonal Meshes Progress in Natural Science, 10(10), 2000
	Hanqiu Sun，Hujun Bao Interactive texture mapping for polygonal models International Journal of Computational Geometry, 15(1-3):41-49, 2000
	Hujun Bao, Li Chen, Jianguo Ying, Qunsheng Peng Non-linear View interpolation IEEE Journal of Visualization and Computer Animation, 1999, 10(4):233-241
	Wenting Zheng, Hujun Bao, Qunsheng Peng, Hanqiu Sun Distributed Virtual Reality System Based on Hybrid Rendering Progress in Natural Science, 10(3):218-224, 2000
	Wenting Zheng, Hujun Bao, Qunsheng Peng, Hanqiu Sun Realtime rendering algorithm Based on A Hybrid Rendering Scheme Progress in Natural Science, 10(2):141-146, 2000
	Yigang Wang，Hujun Bao，Qunsheng Peng Accelerated Walkthroughs of Virtual Environments Based on Visibility Preprocessing and Simplification Computer Graphics Forum, 1998, 17(3): 187-194
	Hujun Bao，Qunsheng Peng Interactive 3D Morphing Computer Graphics Forum, 1998, 17(3):23-30
	Hujun Bao，Xiaogang Jin, Qunsheng Peng A Progressive Radiosity Algorithm Based on Piecewise Polynomial Intensity Distribution, Computers & Graphics, 1997, 21(3):281-288
	Hujun Bao, Sheng Fu, Qunsheng Peng Accelerated Walkthroughs of Complex Scenes Based on Visibility Culling and Image-Based Rendering Journal of Computer Science & Technology, 1998, 13 (Suppl.):9-16
	Sheng Fu, Hujun Bao, Qunsheng Peng An Accelerated Rendering Algorithm for Stereoscopic Display Computers & Graphics, 1996,20(2):223-229
	Hujun Bao, Jianguo Ying, Qunsheng Peng Shading with Curve Light Sources Computer Graphics Forum, 1995,14(3):217-227
	Hujun Bao, Qunsheng Peng A Fast Ray Tracing Algorithm Based on Adaptive Space Subdivision Science in China(Series A),1995, 38(4):490-498
	Hujun Bao, Qunsheng Peng An Efficient Form-factor Evaluation Algorithm for Environments with Curved Surfaces Computers & Graphics,1994,18(4):481-486
	Hujun Bao, Qunsheng Peng Shading Models for Linear and Area Light Sources Computers & Graphics,1993,17(2):137-145
	Hujun Bao, Qunsheng Peng A Progressive Radiosity Algorithm for Scenes Containing Curved Surfaces Computer Graphics Forum,1993,12(3):399-408
	Mingfu Wang, Hujun Bao, Qunsheng Peng A New Progressive Radiosity Algorithm Through the Use of Accurate Form-factors Computers & Graphics,1992.9,16(3):303-309

	3D Morphing
	Morphing of Bunny Model with Constraints, 213 KB Morphing of Head Model without Constraints, 157 KB Morphing of Head Model with Constraints, 158 KB
	Animation
	Expression Clone from Video, 62 MB Central Zone of Our New Campus, 44 MB
	Non-Photorealistic Rendering
	Art Style Transfer Example 1, 954 KB Art Style Transfer Example 2, 1.17 MB Sketch from Image, 1.78 MB
	Realtime Rendering of Large Size of Scenes
	Virtual City with 1,600,000 Polygons, 271 KB Point-Based Rendering Examples, 356 KB Point and Polygon Based Hybrid Rendering Scenes,
	Realistic Image Synthesis
	Constraint-Based Texture Mapping, 841 KB Linear Light Source Shading Example,
	Digital Geometric Signal Processing
	Position Signal Filtering and Enhancement (Venus 2.70 MB, Horse 533 KB) Color Signal Filtering and Enhancement (Bunny 1.14 MB) Geometry Convolution (Bunny 1.38 MB, Mannequin 1.41 MB) Spectral Editing (Cat 1.11 MB) Geometric Signal Compression, 1.31 MB

	PhD Students Advised Yigang Wang, Postdoctor, GMD, Germany Weiqun Cao, Postdoctor, GMD, Germany Wenting Zheng, State Key Lab of CAD&CG, Zhejiang University Xinguo Liu, Microsoft Research China, Beijing Xiang Fang, Bell Laboratory, Shanghai
	PhD students Qing Wang, Xiangjun Zhao, Ying Tang, Xun Wang, Huasheng Zhang, Hua Liu, Zhenlong Du
	Master Students Yuan Wu, Mingya Dai, Dong Xu, Zanxian He, Hua Wang, Zhi He, Yunzhi Zhu, Hongwei Shan