Details of a Researcher - Fujishiro, Issei

Papers - Fujishiro, Issei

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GPU-Based Adaptive Visualization for Particle Systems

ODAGAWA Masato, TAKESHIMA Yuriko, FUJISHIRO Issei, KIKUGAWA Gota, OHARA Taku

Transactions of the JSME (in Japanese) (JSME) 77 ( 781 ) 1767-1778 2011.09

Research paper (scientific journal), Joint Work, Accepted

When visualizing large-scale particle systems, it is difficult to maintain adequate framerates because we have to render dynamic scenes with a large number of small spheres. For the control of trade-offs between the overall image quality and total rendering speed, we propose a new rendering scheme which uses a fast method based on shaded texture mapping and a high-quality implicit surface method in a combined way. The shaded texture mapping, which generates a pseudo-texture through alpha-blending a proper portion of template texture for shade and highlight onto a base spherical texture, can render a particle faster than the implicit surface method. However, a weakness of the texture mapping lies in its poor shading quality. In contrast, the implicit surface method is accurate enough for analyzing particle systems visually. Actual method to render each particle is decided according to the viewing distance; the high-quality method is chosen only when the distance is smaller than a threshold, to allow the user to observe the region of interest closely. We use a molecular dynamics simulation dataset to evaluate the effectiveness of our scheme empirically. In addition to this, we also consider the extensibility of our scheme in terms of framerate stability, scalability, and expressiveness.

Particle-Based Real-Time Flame Rendering

MABUCHI Satoshi, FUJISHIRO Issei, OHNO Yoshio

The Journal of the Institute of Image Electronics Engineers of Japan (IIEEJ) 40 ( 4 ) 541-548 2011.07

Research paper (scientific journal), Joint Work, Accepted, ISSN 0285-9831

In this paper, we propose a particle-based method for real-time flame rendering. In the field of visualization, particle-based volume rendering has been introduced for the purpose of previewing. Our method is a reasonably-simplified version of the particle-based volume rendering. Compared with previous flame rendering methods, both detail representation and controllability are sufficiently improved. In addition to this, it is easily implemented using standard APIs, and its fast enough rendering speed allows us to adjust environmental settings on the fly. Moreover, our method requires a few standard parameters as particle attributes, and thus it would be used in conjunction with existing particle simulators.

Design of Surface Descriptor for Rendering Snow-Covered Terrain

NAKATANI Ayaka, FUJISHIRO Issei, OHNO Yoshio

The Journal of the Society for Art and Science (The Society for Art and Science) 10 ( 2 ) 79-86 2011.06

Research paper (scientific journal), Joint Work, Accepted, ISSN 1347-2267

Seasonally-transient contrast between snow and mountain surfaces makes a big appeal to every viewer. Generally, when deciding how much snow covers the mountain, we need to take many climatological factors into account, and it is likely to complicate the rendering process. In this paper, we present a phenomenological model which easily depicts snow-covered mountains. Our method relies on our own surface descriptor, which is based primarily on Tangent Sphere Accessibility of smoothed height field, and also considers geometric features like azimuth direction and altitudes to a limited extent. The feasibility of the proposed method is illustrated through application to a real height map dataset.

Interpolating 3D diffusion tensors in 2D planar domain by locating degenerate lines

BI Chongke, TAKAHASHI Shigeo, FUJISHIRO Issei

6th International Symposium, ISVC 2010, Las Vegas, NV, USA, November 29-December 1, 2010, Proceedings, Part I (Lecture Notes in Computer Science) (Springer-Verlag) 6453 328-337 2010.11

Research paper (conference, symposium, etc.), Joint Work, Accepted

Interpolating diffusion tensor fields is a key technique to visualize the continuous behaviors of biological tissues such as nerves and muscle fibers. However, this has been still a challenging task due to the difficulty to handle possible degeneracy, which means the rotational inconsistency caused by degenerate points. This paper presents an approach to interpolating 3D diffusion tensors in 2D planar domains by aggressively locating the possible degeneracy while fully respecting the underlying transition of tensor anisotropy. The primary idea behind
this approach is to identify the degeneracy using minimum spanning tree-based clustering algorithm, and resolve the degeneracy by optimizing the associated rotational
transformations. Degenerate lines are generated in this process to retain the smooth transitions of anisotropic features. Comparisons with existing interpolation
schemes will be also provided to demonstrate the technical advantages of the proposed approach.

山岳形状における積雪量を決定するサーフェス記述子の提案

NAKATANI Ayaka, FUJISHIRO Issei, OHNO Yoshio

第26回NICOGRAPH論文コンテスト (芸術科学会) 2010.09

Research paper (conference, symposium, etc.), Joint Work

本論文では，山岳形状における積雪の様子を再現する現象学的モデルを提案する．ここでは，積雪の時間変化や山肌とのコントラストなどの美しさを手軽に表現し，しかも制御可能にすることを目的としている．山肌における積雪の度合いを決めるためには，その場所での気候や気象，雪の密度・粘性・固さなど，一般的に現実世界の多くの物理的ファクタを考慮する必要があるが，本手法では独自のサーフェス記述子を介することで積雪の現象学的再現を試みる．そのサーフェス記述子は，平滑化された高さ場におけるTangent Sphere Accessibility をベースに，方角や高度などの幾何学的条件を限定的に考慮している．本論文ではさらに，実際の標高データを用いた山岳形状に適用し，提案手法の視覚的効果を検証する．

大野義夫先生（慶應義塾大学）第9回CG Japan Awardを受賞

FUJISHIRO Issei

芸術科学会誌 (芸術科学会) ( 21 ) 10-11 2010.08

Research paper (scientific journal), Single Work

Perceptually-guided design of nonperspectives through pictorial depth cues

YOSHIDA Kenichi, TAKAHASHI Shigeo, ONO Hiroaki, FUJISHIRO Issei, OKADA Masato

Proceedings of the Seventh International Conference on Computer Graphics, Imaging and Visualization 173-178 2010.08

Research paper (conference, symposium, etc.), Joint Work, Accepted

Introducing distortions into perspective views is a popular
technique to direct our visual attention to specific objects, as seen in hand-drawn illustrations and cartoon animations. This type of image expression, called nonperspective projection, is feasible in visual communication, because the human visual system can reconstruct the target three-dimensional (3D) scene correctly provided that the corresponding image distortions are within a certain perceptual tolerance. In this paper, we develop a perceptual approach to guiding the
design of such nonperspective images by referring to the 3D
perception induced by pictorial depth cues. We formulate an
acceptable tolerance by investigating how we perceive image
distortion according to the change in the configuration of
depth cues. The obtained formulation is then incorporated
into our new algorithm, with which we can automatically
control plausible image deformation by simply modifying
the positions and sizes of specific objects in a scene.

可視化による知識発見のライフサイクル管理とその流動応用評価

FUJISHIRO Issei, HAYASE Toshiyuki, OOBAYASHI Shigeru, TAKESHIMA Yuriko

平成21年度公募共同研究報告書 (東北大学流体科学研究所) ( J09038 ) 79-80 2010.08

Research paper (other academic), Single Work

自己組織化単分子膜のための粒子配置設計支援システム

TAKESHIMA Yuriko, NIIZAKA Takuma, KIKUGAWA Gota, OHARA Taku, FUJISHIRO Issei

第38回可視化情報シンポジウム講演論文集 (可視化情報学会) 30 ( 1 ) 277 - 280 2010.07

Research paper (conference, symposium, etc.), Joint Work

Topologically-based haptization and visualization of wake turbulence datasets

TAKESHIMA Yuriko, FUJISHIRO Issei, TAKAHASHI Shigeo, OOBAYASHI Shigeru

DVD Proceedings of Image Electronics and Visual Computng 2010 (Institute of Image Electronics Engineers of Japan) 2010.03

Research paper (conference, symposium, etc.), Joint Work, Accepted

VIDELICETにおけるEFD/CFDデータの並置化

FUJISHIRO Issei

宇宙航空研究開発機構特別資料，JAXA-SP-09-002 (宇宙航空研究開発機構) 71-83 2010.01

Research paper (bulletin of university, research institution), Single Work, ISSN 1349-113X

画像における不連続性に対する視覚注意の仕組みに関する研究

FUJISHIRO Issei, TAKESHIMA Yuriko, TAKAHASHI Shigeo, YOSHIDA Kenichi

次世代融合研究システム（スーパーコンピュータ）利用研究成果報告書 (東北大学流体科学研究所未来流体情報創造センター) 12 48 - 52 2009.07

Research paper (other academic), Joint Work

仙台空港における後方乱気流の計測融合シミュレーション

三坂孝志，大林茂，藤代一成，竹島由里子，山田泉，奥野善則

次世代スーパーコンピューティング・シンポジウム 2008 資料集 63 - 64 2008.09

Research paper (conference, symposium, etc.), Joint Work, Accepted

Guest editors' Introduction: Visualization research is growing and expanding

MA Kwan-Liu, FUJISHIRO Issei, LI Hua

IEEE Computer Graphics and Applications (IEEE Computer Society) 28 ( 5 ) 22-23 2008.09

Research paper (scientific journal), Joint Work, Accepted

GPUによる拡散トラクトグラフィ法の高速化

鈴木靖子，竹島由里子，藤代一成

第３６回可視化情報シンポジウム講演論文集 (可視化情報学会) 28 ( 1 ) 83 - 84 2008.07

Research paper (conference, symposium, etc.), Joint Work

2次元投影図上の見えの操作に基づいた非透視投影の設計

YOSHIDA Kenichi, TAKAHASHI Shigeo, FUJISHIRO Issei, OKADA Masato

画像電子学会誌 (東京・画像電子学会) 37 ( 4 ) 412-418 2008.07

Research paper (scientific journal), Joint Work, Accepted, ISSN 0285-9831

一般的に三次元コンピュータグラフィックスでは，透視投影が用いられている．これに対し，人間が描く絵では，複数の視点からの見えを混在させることにより，表現したい対象の特徴を強調した非透視投影が用いられている．本稿では，二次元投影図上の見えを介してユーザが非透視投影図のゆがみを編集することのできる新しい手法を提案する．この手法は，三次元格子点上に定義されたカメラパラメータ場をデータ構造として用いることにより，一つの投影図に複数の視点を混在させることができるようにする．更に，いくつかの基本操作を提供することで，ユーザが二次元投影面を介して，対象シーンを包含するカメラパラメータ場を編集できるようにする．我々の手法を用いることで，三次元シーンの投影図を手描きの絵に合わせるいくつかの設計例を示す．

Guidelines for LoD control in volume visualization

MIYAMURA Hiroko, FUJISHIRO Issei, TAKESHIMA Yuriko, Takeshima, TAKAHASHI Shigeo, SAITO Takafumi

画像電子学会誌 (東京・画像電子学会) 37 ( 4 ) 461 - 468 2008.07

Research paper (scientific journal), Joint Work, Accepted, ISSN 0285-9831

For exploring the inner structures of large scale volume datasets, it is general to use LoD control methods. In order to achieve effective large-scale volume visualization, we propose visualization guidelines to adaptively select appropriate Level of Detail (LoD) control methods according to the predetermined visualization techniques and the setting of parameter values. Our contribution lies in the automatic selection of LoD control methods for visualizing large-scale volume datasets so that even novices can effectively take advantage of the LoD control methods.

Optimization strategies using hybrid MPI+OpenMP parallelization for large-scale data visualization on Earth Simulator

CHEN Li, FUJISHIRO Issei

A Practical Programming Model for the Multi-Core Era (Lecture Notes in Computer Science) (Springer-Verlag) 4935 112-124 2008.07

Research paper (conference, symposium, etc.), Joint Work, Accepted

2次元投影図上の見えの操作に基づいた非透視投影の設計

吉田謙一，高橋成雄，藤代一成，岡田真人

画像電子学会誌 37 ( 4 ) 412 - 418 2008.07

Research paper (scientific journal), Joint Work, Accepted

数万オーダ粒子系のイメージベース可視化

小田川雅人，竹島由里子，藤代一成，菊川豪太，小原拓

第３６回可視化情報シンポジウム講演論文集 (可視化情報学会) 28 ( 1 ) 73 - 74 2008.07

Research paper (conference, symposium, etc.), Joint Work

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