Research Topics

Deformation Model for Haptic Interaction with Dynamically Deformable Object

An approach to haptic interaction with dynamically deformable object is investigated. In the approach, the behavior of an object is defined by a set of temporal deformation patterns after impulse force is applied to each degree of freedom, which we call impulse response deformation model. Deformation resulting from interaction is obtained by computing convolution of the model and the history of interaction force. The time complexity of computing interaction force is independent of the complexity of the model. This feature is advantageous for time-critical applications. Also, the time complexity of computing object deformation is linearly proportional to the complexity of the model.

• Kazuyoshi Tagawa, Koichi Hirora, and Michitaka Hirose, In Proc. of Eurohaptics, Jun. 2008. (to appear)
• Kazuyoshi Tagawa, Koichi Hirora, and Michitaka Hirose, "Manipulation of Dynamically Deformable Object", In Proc. of 16th Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (IEEE Haptics08), Mar. 2008.
• Kazuyoshi Tagawa, Koichi Hirota, and Michitaka Hirose, "Dynamic Deformation Model for Haptic Interaction", IEICE Trans. on Information and Systems, Vol.J90-D, No.9, pp.2615-2623, Sep. 2007.
• Kazuyoshi Tagawa, Koichi Hirota, and Michitaka Hirose, "Acquiring & Representing Elasticity of Deformable Objects using Impulse Response Deformation Model", NASA Ames Research Center, Moffett Field, CA, USA, Mar. 2007.
• Kazuyoshi Tagawa, Koichi Hirota, and Michitaka Hirose, "Impulse Response Model: an Approach to Haptic Interaction with Dynamically Deformable Object", In Proc. of 14th Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (IEEE Haptics06), Mar. 2006. [PDF]
• The University of Tokyo Technology & Science Vol.1, IRT Foundation to Support Man and Aging Society / A Day Robot Become One of the Family / Cyber Interface, Nikkei BP, 2007.

Automultiscopic Display by Revolving Flat-panel Displays

We have been investigating the implementation of an automultiscopic omni-directional display. By rotating a flat-panel display whose viewing angle is strictly limited, or has sharp directivity, different and independent views are presented to different viewpoints. Design parameters including the resolution of viewpoints and update rate for viewers are clarified, and the effect of the refresh rate of display panels, speed of rotation, directivity of the panel on these parameters are discussed. Based on the discussion; the implementation of a prototype is reported. A directional filter using lenticular and slit array is devised, and its characteristic is evaluated. Also, a rendering algorithm that takes into account the effect of rotation of the display panel is proposed. Through experiments the feasibility of the proposed approach is confirmed.

• Koichi Hirora, Kazuyoshi Tagawa, and Yasuhiro Suzuki, "Automultiscopic Display by Revolving Flat-panel Displays", In Proc. of IEEE Virtual Realiry 2008 (IEEE-VR08).
• Koichi Hirota, Kazuyoshi Tagawa, and Yasuhiro Suzuki, "Multi-viewpoint Display by Rotating Flat Display Panel", In Proc. of VRSJAC2007(domestic), Sep. 2007.

Evaluation of Cloth Simulation using Experiments in a Vacuum

With the aim of realizing cloth behavior simulation that can generate natural free flowing cloth behavior which exists in our natural surroundings, evaluating and improving its calculation method is indeed challenging work. In order to evaluate cloth behavior simulation under ideal conditions, we have been carrying out experiments in a vacuum.

• Kazuyoshi Tagawa, Hirotaku Hayashi and Ryugo Kijima, "Empirical Evaluation of Cloth Behavior Simulation", In Proc. of Int. Conf. on VSMM '04, Int. Soc. On VSMM, 2004.
• Kazuyoshi Tagawa, Hirotaku Hayashi and Ryugo Kijima, "Evaluation of Cloth Behavior Simulation", In Proc. of Symposium on Computer Graphics and Animation, ACM Siggraph / Eurographics, 2004.
• Kazuyoshi Tagawa, Hirotaku Hayashi, Ryugo Kijima, "Dynamic Cloth Simulation and its Evaluation Experiments in Vacuum", Transaction of Virtual Reality Society of Japan, vol. 8, no. 3, pp.263-270, 2003. [PDF] (in Japanese)

Construction of a Virtual Fashion System

• Kazuyoshi Tagawa, Tomokazu Kakimi, Ryugo Kijima and Takeo Ojika, "A Method for Dynamic Cloth Simulation and Application in a Virtual Fashion System", In Proc. of Int. Conf. on VSMM '98, Int. Soc. On VSMM, 1998.