Real-time ink simulation

We have presented effective methods to simulate the ink diffusion process in real time that yields realistic visual effects. Our algorithm updates the dynamic ink volume using a hybrid grid-particle method: the fluid velocity field is calculated with a low-resolution grid structure, whereas the highly detailed ink effects are controlled and visualized with the particles. To facilitate user interaction and extend this method, we proposed a particle-guided method that allows artists to design the overall states using the coarse-resolution particles and to preview the motion quickly. To treat coupling with solids and other fluids, we update the grid-particle representation with no-penetration boundary conditions and implicit interaction conditions. To treat moving "ink-emitting" objects, we introduce an extra drag-force model to enhance the particle motion effects. Our work is attractive for animation production and art design and is popular in China.

Content-Based Color Transfer

We have presented a novel content-based method for transferring the color patterns between images. Unlike previous methods that rely on image color statistics, our method puts an emphasis on high-level scene content analysis. We first automatically extract the foreground subject areas and background scene layout from the scene. The semantic correspondences of the regions between source and target images are established. In the second step, the source image is re-colored in a novel optimization framework, which incorporates the extracted content information and the spatial distributions of the target color styles. A new progressive transfer scheme is proposed to integrate the advantages of both global and local transfer algorithms, as well as avoid the over-segmentation artifact in the result. Experiments showed that with a better understanding of the scene contents, our method well preserves the spatial layout, the color distribution and the visual coherence in the transfer process. This work is useful for Computational photography and film industry.

We mention here papers published from the last four years in the best international reviews in Computer Graphics i.e. ACM Transactions on Graphics, ACM Siggraph / Siggraph Asia, IEEE Transactions on Visualization and Computer Graphic, Computer Graphics Forum and The Visual Computer (Springer Verlag).

[19] Shi Kan Le, Yong Jun-Hai, Jean-Claude Paul, Sun Jia-Guang. Continuity Transition with a Single Regular Curved-Knot B-Spline Surface. ACM Transaction on Graphics 2012.

[20] Weiming Dong, Ning Zhou, Tong-Yee Lee, Fuzhang Wu, Yan Kong, Xiaopeng Zhang: Summarization-Based Image Resizing by Intelligent Object Carving. IEEE Transactions on Visualization and Computer Graphics, 20(1): 111-124 (2014).

[21] Fuzhang Wu, Weiming Dong, Yan Kong, Xing Mei, Jean-Claude Paul, Xiaopeng Zhang: Content-Based Colour Transfer. Comput. Graph. Forum 32(1): 190-203 (2013)

[22] Yan Kong, Weiming Dong, Xing Mei, Xiaopeng Zhang, Jean-Claude Paul: SimLocator: robust locator of similar objects in images. The Visual Computer 29(9): 861-870 (2013)

[23] Weiming Dong, Ning Zhou, Jean-Claude Paul, Xiaopeng Zhang: Optimized image resizing using seam carving and scaling. ACM Transactions on Graphics 28(5) (2009)

[24] Jiating Chen, Xiaoyin Ge, Li-Yi Wei, Bin Wang, Yusu Wang, Huamin Wang, Yun Fei, Kang-Lai Qian, Jun-Hai Yong, Wenping Wang. Bilateral Blue Noise Sampling. ACM Transactions on Graphics 2013 (SIGGRAPH Asia 2013, Hong Kong), 2013, 32(6): 216:1-216:11.

[25] Wenshan Fan, Bin Wang, Jean-Claude Paul and Jiaguang Sun. A Hierarchical Grid Based Framework for Fast Collision Detection. Computer Graphics Forum (Proceedings of SGP 2011), 2011, 30(5): 1451-1459.

[26] Jiating Chen, Bin Wang and Junhai Yong. Improved Stochastic Progressive Photon Mapping with Metropolis Sampling. Computer Graphics Forum (Proceedings of EGSR 2011), 2011, 30(4): 1205-1214.

[27] Jiating Chen, Bin Wang, Yuxiang Wang, Ryan S. Overbeck, Junhai Yong and Wenping Wang. Efficient Depth-of-Field Rendering with Adaptive Sampling and Multiscale Reconstruction. Computer Graphics Forum, 2011, 30(6): 1667-1680.

[28] Chunhui Yao, Bin Wang, Bin Chan, Junhai Yong and Jean-Claude Paul. Multi-Image Based Photon Tracing for Interactive Global Illumination of Dynamic Scenes. Computer Graphics Forum (Proceedings of EGSR 2010), 2010, 29(4): 1315-1324.

[29] Jiating Chen, Bin Wang. High Quality Solid Texture Synthesis using Position and Index Histogram Matching. The Visual Computer, 2010, 26(4): 253-262