Faculty Profiles - AKAGI Yasuhiro

Papers - AKAGI Yasuhiro

Division display 21 - 30 of about 30 ／ All the affair displays >>

DEMO PAPER: A CONTENT CREATION SYSTEM FOR INTERACTIVE 3D ANIMATIONS Reviewed

Akagi Yasuhiro, Furukawa Masayuki, Fukumoto Shinya, Kawai Yukiko, Kawasaki Hiroshi

ELECTRONIC PROCEEDINGS OF THE 2013 IEEE INTERNATIONAL CONFERENCE ON MULTIMEDIA AND EXPO WORKSHOPS (ICMEW) page： . 2013

INTERACTIVE 3D ANIMATION SYSTEM BASED ON TOUCH INTERFACE AND EFFICIENT CREATION TOOLS Reviewed

Akagi Yasuhiro, Furukawa Masayuki, Fukumoto Shinya, Kawai Yukiko, Kawasaki Hiroshi

2013 IEEE INTERNATIONAL CONFERENCE ON MULTIMEDIA AND EXPO (ICME 2013) page： . 2013

A facial motion tracking and transfer method based on a key point detection Reviewed

Akagi Yasuhiro, Furukawa Ryo, Sagawa Ryusuke, Ogawara Koichi, Kawasaki Hiroshi

WSCG 2013, COMMUNICATION PAPERS PROCEEDINGS page： 137-144 2013

3D Virtual Foot Modeling from Multiple Camera Image Data Based on the GFFD Deformation Method Reviewed

KONDO Satoshi, AKAGI Yasuhiro, KITAJIMA Katsuhiro

Journal of the Japan Society for Precision Engineering Vol. 76 ( 4 ) page： 474-480 2010

Publishing type：Research paper (scientific journal)

This paper proposes a novel method of generating a 3D virtual foot model from multiple camera image data based on the GFFD deformation method. 3D virtual foot models for individual persons can be generated easily and rapidly with considerably low cost. By estimating the cause of errors that can occur in the whole process and endeavoring to lower the errors, we succeeded to achieve satisfactory accuracy. The errors are mainly classified into two kinds. One occurs in transforming process with use of the GFFD deformation method and the other in obtaining 3D coordinates of feature points. So, we devoted ourselves to eliminate the cause of both errors and repeated experiments again and again. As a result, we got to get a 3D virtual foot model within acceptable error range. The average error is 1.32&sim;1.72mm.

A Study on Production Support System for Animation of Swaying Trees with Use of Parallel Processing Reviewed

AKAGI Yasuhiro, KITAJIMA Katsuhiro

Journal of the Japan Society for Precision Engineering Vol. 75 ( 7 ) page： 859-864 2009

Publishing type：Research paper (scientific journal)

In this paper, we propose a parallel processing technique for creating animation of swaying trees in the wind based on physical simulation. Our technique independently assigns each tree to computation nodes. The each node processes not only parallel rendering for tree shapes, but also parallel simulation of the wind and bending of branches. This independency reduces data traffics between nodes and realizes efficient parallel processing. When the each node independently simulates the wind, it is necessary to consider wind interactions between the upper and the lower side tree. Therefore, we realize cooperative wind simulation with independent cluster nodes, by inventing a novel method for estimates of wind velocity of lower-side trees from simulation results of upper-side trees. By synthesizing rendered images from each cluster, our system generates animations of swaying trees. Through many experiments using these techniques, it is shown that the efficiency of parallel processing for animation of swaying trees is verified.

A Study on Facial Modeling Based on the GFFD Method Reviewed

KITAJIMA Katsuhiro, AKAGI Yasuhiro, YAMAUCHI Akira, OKAZAWA Naoki, HIGUCHI Yasukazu

Journal of the Japan Society of Precision Engineering Vol. 74 ( 8 ) page： 883-890 2008.8

Language：Japanese Publishing type：Research paper (scientific journal)

In this paper, we propose a method of generating individual facial models based on a generic facial model with not only a skin model but also additional data such as skull model, facial expression muscle model, etc. When the generic facial model is transformed into individual facial models by GFFD (Generalized Free-Form Deformation), not only skin model but also additional data are automatically altered into a suitable state for individual faces at the same time. By using this method, we can easily do a simulation of facial expression or hairstyle without making additional data for each individual facial model.

A Color Region Based Rendering of Trees Based on Shading Techniques of Background Art in Animation Reviewed

AKAGI YASUHIRO, KATAAMA MITSUNORI, KITAJIMA KATSUHIRO

IPSJ journal Vol. 49 ( 3 ) page： 1489-1499 2008.3

Language：Japanese Publishing type：Research paper (scientific journal)

In this paper, we describe a non-photorealistic rendering (NPR) framework for generating background art in animation. The background art, in many cases that is a Landscape Painting, is generally used in animation productions. One background art and multiple layers of moving characters compose a scene. The background art is one of most important factor for making the impression of an animation. We propose, in particular, a NPR technique that can reproduce painting techniques characteristic of background art such as leaf painting based on just a few colors, shading to produce a spherical effect, and aerial perspective. This technique can generate dynamic background art having a swaying motion in the wind by applying the animation generation tool for swaying trees developed by the authors. The proposed method, in contrast, is based on a painting technique for background art, which enables it to pick up features of the target work of art and to reproduce its style.

Study on a method of generating a 3D virtual foot model with use of a measuring technique based on multiple camera image data Reviewed

Kondo Satoshi, Akagi Yasuhiro, Kitajima Katsuhiro

PROCEEDINGS OF SICE ANNUAL CONFERENCE, VOLS 1-8 page： 7-11 2007

Study on Generation of Tree Shapes with Specific Features of Species Based on a Statistical Method Reviewed

AKAGI Yasuhiro, KITAJIMA Katsuhiro

The IEICE transactions on information and systems Vol. 89 ( 5 ) page： 1019-1035 2006.5

Computer Animation of Swaying Trees Based on Physical Simulation Reviewed

AKAGI YASUHIRO, SANAMI SYO, KITAJIMA KATSUHIRO

IPSJ journal Vol. 46 ( 7 ) page： 1797-1809 2005.7

Language：Japanese Publishing type：Research paper (scientific journal)

This paper presents a series of techniques for generating animations of trees swaying in the wind, in consideration of the influences that the tree shapes and leaf sizes give to the air current. To do the simulation of the wind around a tree having a complicated shape, it is necessary to consider the influence that some objects obstructing the wind such as leaves or branches give. Generally, the following problem occurs when we use the incompressible Navier-Stokes equations in a physical simulation model of the wind. Computational complexity increases because of considering the details of tree shapes, so it is difficult to generate the animations in real-time. Therefore, this paper proposes a novel method that reduces the computational complexity and realizes an animation in real-time, by means of a boundary condition map expressing space distribution of resistances from tree models automatically. In this case, we make a model as simple resistances decreasing the wind velocity from the parts that have similar shapes like leaves and branches. And also, it has another advantage that the influences between a tree and others can be rapidly calculated by using a hierarchical calculation method. Finally, through many experiments using these methods, it is shown that real-time animations of swaying trees in the wind can be realized.

　 PREV - NEXT 　

<AKAGI Yasuhiro>

Papers - AKAGI Yasuhiro