Image and Video Retexturing pdf
Yanwen Guo, Jin Wang, Xiang Zeng, Zhongyi Xie, Hanqiu Sun, Qunsheng Peng
CASA 2005 (International Conference), Also In: Computer Animation and Virtual Worlds. 2005, 16(3), pp. 451-461. (CAVW, SCI, EI)

We propose a novel image/video retexturing approach that preserves the original shading effects without knowing the underlying surface and lighting conditions. For static images, we first introduce the Poisson equation-based algorithm to simulate the texture distortion on the projected interest region of the underlying surface, while preserving the shading effect of the original image. We further work on videos by retexturing the key frame as static image and then propagating the results onto the other frames. In video retexturing, we have introduced the mesh based optimization for object tracking to avoid texture drifting, and the graph cut algorithm to effectively deal with visibility shift between frames. The graph cut algorithm is applied on a trimap along the boundary of the object to extract the textured part inside the trimap. The proposed approach is developed in image/video retexturing at nearly interactive rate, and our experimental results have showed the satisfactory performance of our approach

A Novel Constrained Texture Mapping Method Based on Harmonic Map pdf
Yanwen Guo, Jin Wang, Hanqiu Sun, Qunsheng Peng
Computers & Graphics, 2005, 29(6), pp. 972-979. (SCI, EI, ISTP)

In this paper, we present anovelconstrainedtexturemappingmethodbased on the harmonicmap. We first project the surface of a 3D model on a planar domain by an angle-based-flattening technique and perform a parametrization. The user then specifies interactively the constraints between the selected feature points on the parametric domain of the 3D model and the corresponding pixels on the texture image; the texture coordinates of other sample points on the 3D model are determined based on harmonicmapping between the parametric domain of the model and the texture image; finally we apply an adaptive local mapping refinement to improve the rendering result in real-time. Compared with other interactive methods, our method provides an analytically accurate solution to the problem, and the energy minimization characteristic of the harmonicmap reduces the potential distortion that may result in the constrainedtexturemapping. Experimental data demonstrate good rendering effects generated by the presented algorithm.

A New Constrained Texture Mapping Method pdf
Yanwen Guo, Jin Wang, Xiufen Cui, Qunsheng Peng
ICEC 2005 (International Conference), Springer Lecture Notes in Computer Science, LNCS 3711, 2005, pp. 48-58. (SCI)

The validity of texture mapping is an important issue for point or mesh based surfaces. This paper provides a new constrained texture mapping method which is capable of ensuring the validity of texture mapping. The method employs the “divided-and-ruled” strategy to construct a direct correspondence between the respective patches of the texture image and 3D mesh model with feature matching. The mesh model is segmented based on the “approximate shortest path”. Further, a “virtual image” relaxation scheme is performed to refine the rendering effect. We show how mesh morphing can be conducted efficiently with our constrained texture mapping method. Experiment results demonstrate the satisfactory effects for both texture mapping and mesh morphing.

Smooth Feature Line Detection for Meshes pdf
Yanwen Guo, Qunsheng Peng, Guofei Hu, Jin Wang
Journal of Zhejiang University SCIENCE, 2005, 6(A), 5, pp, 460-468. (EI)

The validity of texture mapping is an important issue for point or mesh based surfaces. This paper provides a new constrained texture mapping method which is capable of ensuring the validity of texture mapping. The method employs the “divided-and-ruled” strategy to construct a direct correspondence between the respective patches of the texture image and 3D mesh model with feature matching. The mesh model is segmented based on the “approximate shortest path”. Further, a “virtual image” relaxation scheme is performed to refine the rendering effect. We show how mesh morphing can be conducted efficiently with our constrained texture mapping method. Experiment results demonstrate the satisfactory effects for both texture mapping and mesh morphing.

基于调和映射的约束纹理映射方法 pdf
郭延文*, 潘永娟,崔秀芬
计算机辅助设计与图形学学报, 2005 17(7), pp. 1457-1462.) (EI, page one)

传统的约束纹理映射方法大都建立在迭代优化的基础上，给出的解多为近似解．为此，提出了一种基于调和映射的约束纹理映射方法，利用该方法可以得到约束纹理映射问题的一个形式化精确解．由于调和映射具有保持映射能量最小的良好性质，因此该方法能够最小化纹理映射的形变；另外，约束的纹理映射是个大交互量的工作，埘映射效果的优化调整非常重要，提出的自适应局部邻域调整方法能够实现映射效果的实时优化．该方法鲁棒并且效率高，实验结果表明利用该方法能够取得良好的绘制效果．