研究成果

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[Poster] Rendering Animated Hair Under Dynamic Environmental Lighting
Xiaoxiong Xing, Yoshinori Dobashi, Tsuyoshi Yamamoto, Yosuke, Katsura, Ken Anjyo
ACM SIGGRAPH ASIA 2012 Poster Program, 2012.11
We present a fast algorithm for the interactive rendering of animated hair under a dynamic lighting environment. Previous methods use spherical radial basis functions (SRBF) for efficient evaluation of the rendering equation for hair [Ren et al. 2010]. However, this method is not suitable for dynamic lighting environments, since it requires a high computational cost to approximate environmental li...
[Journal] An inverse problem approach for automatically adjusting the parameters for rendering clouds using photographs
Yoshinori Dobashi, Wataru Iwasaki, Ayumi Ono, Tsuyoshi Yamamoto, Yonghao Yue, Tomoyuki Nishita
ACM Transactions on Graphics (TOG) - Proceedings of ACM SIGGRAPH Asia 2012, Volume 31 Issue 6, November 2012 Article No. 145 PDF | DOI
Clouds play an important role in creating realistic images of outdoor scenes. Many methods have therefore been proposed for displaying realistic clouds. However, the realism of the resulting images depends on many parameters used to render them and it is often difficult to adjust those parameters manually.
This paper proposes a method for addressing this problem by solving an inverse rendering p...
[Invited Talk] Mathematical models for computer facial animation
Ken Anjyo
Joint Workshop of IMS and IMI on Mathematics for Industry, Singapore, 2012.9
[Conference] Extracting Fluid from a Video for Efficient Post-Production
Makoto Okabe, Ken Anjyo, Rikio Onai
ACM Digital Library, DigiPro '12 Proceedings of the Digital Production Symposium Pages 53-58, DOI
This paper proposes a method to extract fluids from a video that is captured outside a special studio. The method allows the designer to efficiently use the extracted fluids for the post-production.
[Conference] A Data-Driven Approach for Synthesizing High-Resolution Animation of Fire
Syuhei Sato, Takuya Morita, Yoshinori Dobashi, Tsuyoshi Yamamoto
ACM Digital Library, DigiPro '12 Proceedings of the Digital Production Symposium Pages 37-42, PDF | DOI
This work proposes a simple and efficient data-driven method for synthesizing high-resolution 3D animations of fire from low-resolution fluid simulations. The key concept behind our method is to use a pre-computed database of high-resolution velocity fields in order to produce small-scale details that are lost in low-resolution velocity fields.
[Conference] Mathematical Analysis on Affine Maps for 2D Shape Interpolation
Shizuo Kaji, Sampei Hirose, Shigehiro Sakata, Yoshihiro Mizoguchi, Ken Anjyo
EG and ACM Digital Libraries, Eurographics / ACM SIGGRAPH Symposium on Computer Animation (SCA2012), PDF| DOI
This paper gives a simple mathematical framework for 2D shape interpolation methods that preserve rigidity. An interpolation technique in this framework works for given the source and target 2D shapes, which are compatibly triangulated. Focusing on the local affine maps between the corresponding triangles, we describe a global transformation as a piecewise affine map. Several existing rigid shape ...
[Invited Talk] Geometrical and Statistical Issues in Computer Facial Animation
Ken Anjyo
Study Group Workshop 2012 (SGW 2012), Fukuoka, 2012.7
[Invited Talk] Modeling, Rendering, and Simulating Clouds
Yoshinori Dobashi
Spring Conference on Computer Graphics, Slovakia, 2012.5
TBA
[Journal] Spacetime Expression Cloning for Blendshapes
Yeongho Seol, J. P. Lewis, Jaewoo Seo, Byungkuk Choi, Ken Anjyo, Junyong Noh
ACM Transactions on Graphics (TOG) , Volume 31 Issue 2, Article No. 14, 2012.4 DOI
The goal of a practical facial animation retargeting system is to reproduce the character of a source animation on a target face while providing room for additional creative control by the animator. This paper presents a novel direct method for facial animation retargeting. Our approach starts from the basic principle that the source and target movements should be similar. By interpreting movement...
[Invited Talk] Modeling, Rendering and Simulating Clouds
Yoshinori Dobashi
Studio Phones Seminar, Kobe
TBA
[Invited Talk] Long-term-internship for PhD students in Mathematics in Japan status and procedure in the course-curriculum, joint research activities
Masato Wakayama
IDTC Research Methodology Workshop
TBA
[Invited Talk] Remarks on geodesics for multivariate normal models
Masato Wakayama
WIAS+MATHON Joint Seminar
TBA
[Poster] Hybrid Framework for Blendshape Manipulations
Hideki Todo, Ken Anjyo
Proceeding SIGGRAPH Asia 2011 Posters, 2011.12
We propose a hybrid blendshape manipulation framework to accelerate the face posing process. The hybrid framework enables interactive edits with direct manipulation and face-constraint-relaxation, which also avoid face geometry distortion during operations. An underlying primitive in this framework is a constraint blendshape model, which operates indirectly sliders by solving a simple least square...
[Invited Talk] Transforming 2D Image to 3D Animation–From a Practitioner’s Viewpoint
Ken Anjyo
Session : Mathematical aspects of Computer Graphics, Mathematical Aspect of Image Processing and Computer Vision (MAIPCV) Winter School 2011
TBA
[Journal] Controlling Explosion Simulations by Estimating the Optimal Initial Intensity Distribution and Predicting Control
Shuhei Sato, Yoshinori Dobashi, Tsuyoshi Yamamoto, Ken Anjyo
The Journal of The Institute of Image Information and Television Engineers, Vol. 65, No. 10, 2011.10
DOI
Recently, many methods for simulating natural phenomena on the basis of fluid simulation have been proposed. A method for simulating explosions was also proposed, but the shapes of the simulated explosions depend on many simulation parameters. Therefore, creating the desired shape for an explosion as specified by the user is difficult. In this paper, we propose a method for controlling explosion s...
[Invited Talk] Fluid Simulation in CG : Visual Simulation of Natural Phenomena
Yoshinori Dobashi
JGFoS 2011 (Japanese-German Frontiers of Science Symposium)
TBA
[Poster] Light-based Mapping for Non-photorealistic Rendering
Shun’ichi Yokoyama, Hideki Todo, Ken Anjyo
Forum Math-for-Industry 2011, COE Lecture Note Vol.32, 2011.10
[Best Poster Award]
We propose a light-based mapping method to construct a light-dependent parameterization which addresses discontinuity of fixed parameterizations used in the highlight shader and related shading interfaces. The flexibility of our approach also enables users to design a variety of NPR-effects interactively.
[Conference] Controlling Simulated Explosions by Optimization and Prediction
Syuhei Sato, Yoshinori Dobashi, Tsuyoshi Yamamoto, Ken Anjyo
Proc. 12th International Conference on Computer-Aided Design and Computer Graphics, pp. 296-301, 2011. 9
This paper presents a method for controlling simulated explosions by prediction and optimization. Many methods have been proposed for simulating realistic explosion based on numerical fluid analysis. These methods are widely used in applications such as movies and computer games. In these applications, there is often a requirement for the explosion to conform to a specified final shape. The goal o...
[Invited Talk] Mathematical consideration on visualization of complex objects
Hiroyuki Ochiai
International Symposium on Plasma Turbulence, Imaging and Synergy
TBA
[Journal] RBF Interpolation and Gaussian Process Regression Through an RKHS Formulation
Ken Anjyo, J. P. Lewis
Journal of Math-for-Industry, Vol.3 JMI2011A-6 (pp.63-71), 2011.4
Radial Basis Function (RBF) interpolation is a common approach to scattered data interpolation. Gaussian Process regression is also a common approach to estimating statistical data. Both techniques play a central role, for example, in statistical or machine learning, and recently they have been increasingly applied in other fields such as computer graphics. In this survey we describe the formulati...
[Seminar] Scattered Data Interpolation for Computer Graphics
J.P. Lewis, Fred Pighin, Ken Anjyo
SIGGRAPH ASIA 2010 (the 3rd SIGGRAPH Conference and Exhibition in ASIA), 2011.12
The goal of scattered data interpolation techniques is to construct a (typically smooth) function from a set of unorganized samples. These techniques have a wide range of applications in computer graphics. For instance they can be used to model a surface from a set of sparse samples, to reconstruct a BRDF from a set of measurements, to interpolate motion capture data, or to compute the physical pr...
[Invited Talk] Visual Simulation of Natural Phenomena Based on Computational Fluid Dynamics
Yoshinori Dobashi
Forum Math-for-Industry 2010, MI Lecture Note Vol.27, 2010.10
Visual simulation of natural phenomena has become one of the most important research topics in computer graphics. Such phenomena include water, fire, smoke, clouds, and so on. Realistic simulation of these phenomena can be achieved by solving a set of partial differential equations, called Navier-Stokes equations. In this talk, I will briefly review the Navier-Stokes equations and explain how the ...
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