Issei Fujishiro
Computational Journalism: Promising scenarios of big data visualization
Transactions on Image Electronics and Visual Computing (invited paper), Vol. 2, No. 2, pp. 134-137, December 2014
A nascent framework, called computational journalism, is intended to take the concept of accountability into account so as to suggest a promising direction of computer visualization research and development toward the era of big data. In this article, we strive to identify six central features inherent to computational journalism | super real-time computability, spatiotemporal completeness, visualization provenance management, first-person perspective preservation, audience-driven reporting, and perceptually-allowable deformation | through re-examining practical results obtained in our recent visualization studies. Each of these features indeed contributes to breaking the curse of traditional media, and seeking out the ideal form of journalism.

Tetsuya Takahashi, Yoshinori Dobashi, Issei Fujishiro, Tomoyuki Nishita
Volume preserving viscoelastic fluids with large deformations using position-based velocity corrections
The Visual Computer, Vol. 32, No. 1, pp. 57–66, January 2016 (first online: December 6, 2014) [DOI: 10.1007/s00371-014-1055-x]
We propose a particle-based hybrid method for simulating volume preserving viscoelastic fluids with large deformations. Our method combines smoothed particle hydrodynamics (SPH) and position-based dynamics (PBD) to approximate the dynamics of viscoelastic fluids. While preserving their volumes using SPH, we exploit an idea of PBD and correct particle velocities for viscoelastic effects not to negatively affect volume preservation of materials. To correct particle velocities and simulate viscoelastic fluids, we use connections between particles which are adaptively generated and deleted based on the positional relations of the particles. Additionally, we weaken the effect of velocity corrections to address plastic deformations of materials. For one-way and two-way fluid-solid coupling, we incorporate solid boundary particles into our algorithm. Several examples demonstrate that our hybrid method can sufficiently preserve fluid volumes and robustly and plausibly generate a variety of viscoelastic behaviors, such as splitting and merging, large deformations, and Barus effect.

Ken Nagao, Issei Fujishiro
Mood-Learning Public Display: Adapting content design evolutionarily through viewers’ involuntary gestures and movements
IEICE Transactions on Information and Systems, Vol. E97-D, No. 8, pp. 1991-1999, August 2014 [DOI: 10.1587/transinf.E97.D.1991]
Due to the recent development of underlying hardware technology and improvement in installing environments, public display has been becoming more common and attracting more attention as a new type of signage. Any signage is required to make its content more attractive to its viewers by evaluating the current attractiveness on the fly, in order to deliver the message from the sender more effectively. However, most previous methods for public display require time to reflect the viewers’ evaluations. In this paper, we present a novel system, called Mood-Learning Public Display, which automatically adapts its content design. This system utilizes viewers’ involuntary behaviors as a sign of evaluation to make the content design more adapted to local viewers’ tastes evolutionarily on site. The system removes the current gap between viewers’ expectations and the content actually displayed on the display, and makes efficient mutual transmission of information between the cyberworld and the reality.

Tetsuya Takahashi, Tomoyuki Nishita, Issei Fujishiro
Fast simulation of viscous fluids with elasticity and thermal conductivity using position-based dynamics
Computers & Graphics, Vol. 43, pp. 21-30, July 2014 [DOI: 10.1016/j.cag.2014.06.002]
In this paper, we propose a novel particle-based Lagrangian method for efficiently simulating viscous fluids by adopting position-based constraints. Our method uses the geometric configuration of particles for the positional constraints to approximate the dynamics of viscous fluids using position-based dynamics; thus the method can plausibly generate their motions while allowing for the use of much larger time steps than those previously adopted in the viscous fluid simulations. We also propose an associated boundary-handling scheme for position-based fluids to precisely specify boundary conditions for the constraints. Additionally, we reproduce elastic deformations of materials by controlling the constraints and incorporate thermal conduction into our framework to simulate resultant changes in particle properties and phase transition in the materials. By adjusting parameters, our method can encompass complex motions of fluids with different properties in a unified framework. Several examples demonstrate the effectiveness as well as versatility of our method.


竹島 由里子,藤代 一成,高橋 成雄,早瀬 敏幸
画像電子学会誌, Vol. 43, No. 3, pp. 357-366,2014 年7 月



山本 高美, 中山 雅紀, 藤代 一成, 桂 瑠以, 坂元 章
芸術科学会論文誌,Vol. 14, No. 1, pp. 9-19,2015年3月
本論文では,3D スキャナによって採取した 3D ボディデータを分析することで,スカートの高精度な設計から,その展開に基づいたスカート原型作製までカバーするデザインシステムを提案する.本システムは,(1)人体のポリゴンデータから意図するデザインに沿った正確な基準断面データ生成可能,(2)基準断面データを用いた立体裁断方式による自動作図機能,(3)多くの体型に対応可能なパターン生成という特長をもつ.これにより,個々の 3D ボディデータが高速に分析でき,体型にフィットした着心地の良いスカート原型を短時間に得ることが可能となった.


Kazuhide Ueda, Issei Fujishiro
Splashing liquids with ambient gas pressure
Proceedings of ACM SIGGRAPH Asia 2014 Technical Briefs, Shenzhen (China), December 2014 [DOI: 10.1145/2669024.2669036]
Splashing occurs when a liquid drop hits the solid or fluid surface at a high velocity. The drop after the impact spreads and forms a corona with a thickened rim, which first develops annular undulations and then breaks into secondary droplets. We have many chances to see splashes in our daily life, e.g., milk crown, splashing paint, and raindrops falling onto a pool, whose characteristics of deformation have a significant impact on the visual reality of the phenomena. Many experimental studies have been conducted to find criteria on when splashing would occur, but the physical mechanisms of splashing are still not completely understood. It was only recently discovered that ambient gas pressure is a principal factor for creating such a splash. In this paper, therefore, we newly incorporate the ambient gas pressure effect into the Navier-Stokes equations through SPH fluid simulation for representing more accurate splashing dynamics. Our experiments demonstrated that the new approach requires very little additional computing cost to capture realistic liquid behaviors like fingering, which have not previously been attained by SPH nor most schemes for fluid simulation.

Takami Yamamoto, Masanori Nakayama, Rui Katsura, Akira Sakamoto, Issei Fujishiro
Development of a pants pattern design system based on 3D human body measurement data analysis
in Proceedings of the 4th IIEEJ International Workshop on Image Electronics and Visual Computing Workshop 2014, Vol.4B-2, Koh Samui (Thailand), October 2014
In this paper, we propose a pants pattern design covering its highly precise design to pattern making by analyzing human body measurement data acquired with a 3D scanner. This system is characterized by: (1) being able to analyze data required for the design of pants patterns using an improved 3D human body measurement analysis application, and (2) being provided with automatic pants drafting functions installed in an apparel CAD system using 3D human body measurement data. As a result, individual 3D human body measurement data can be analyzed both accurately and rapidly, thereby enabling pants patterns that are comfortable and properly fit the physique of the wearer to be obtained in a short period of time.

Koto Nohno, Hsiang-Yun Wu, Kazuho Watanabe, Shigeo Takahashi, Issei Fujishiro
Spectral-based contractible parallel coordinates
Proceedings of iV2014, Paris (France), pp. 7-12, July 2014 [DOI: 10.1109/IV.2014.60]
This paper presents a method of alleviating such visual clutter by contracting multiple axes through the analysis of correlation between every pair of variables. In this method, we first construct a graph by connecting axis nodes with an edge weighted by data correlation between the corresponding pair of dimensions, and then reorder the multiple axes by projecting the nodes onto the primary axis obtained through the spectral graph analysis. This allows us to compose a dendrogram tree by recursively merging a pair of the closest axes one by one. Our visualization platform helps the visual interpretation of such axis contraction by plotting the principal component of each data sample along the composite axis. Smooth animation of the associated axis contraction and expansion has also been implemented to enhance the visual readability of behavior inherent in the given high-dimensional datasets.

Yuriko Takeshima, Takashi Misaka, Shigeru Obayashi, Frank Holz’apfel, Hiroshi Kato, Shigeo Takahashi, Issei Fujishiro
Topological approach to multisensory realization of wake turbulence
Proceedings of Aviation 2014, pp. 7-12, Atlanta (United States), June 2014 [DOI: 10.2514/6.2014-2335]
It is important to analyze the process of wake turbulence collapse to avoid serious accidents. In this study, we propose a topology-based multisensory realization method that allows observers to comprehend the behavior of wake turbulence phenomena in more intuitive manner. We propose the use of adaptive visual transfer functions as well as haptic transfer functions with three degrees of freedom to produce three-dimensional forces, which allow the identification of the location and strength of a target vortex. We evaluate the effectiveness of our method using a time-varying three-dimensional wake turbulence dataset.

Tetsuya Takahashi, Issei Fujishiro, Tomoyuki Nishita
A velocity correcting method for volume preserving viscoelastic fluids
Proceedings of CG International 2014, Sydney (Australia), June 2014
We propose a new particle-based method for simulating viscoelastic fluids which preserve their volumes. Our method achieves the volume preservation by enforcing the incompressibility of fluid, while correcting particle velocities to approximate the dynamics of viscoelastic fluids without disturbing computations for the incompressible ow. We offer three schemes for correcting particle velocities. The first scheme employs Shape Matching proposed by Müeller et al. to derive appropriate transformations of particle sets. The second computes attraction forces on the basis of Hooke’s law to restrict particle motions. The third utilizes Position-Based Dynamics to restore the original relations of particle positions. The first scheme enables smooth transfers of deformation waves, the second is intuitive and simple, and the third is easy to tune parameters. We demonstrate that our method can preserve fluid volumes while generating plausible viscoelastic motions.

Tetsuya Takahashi, Issei Fujishiro, Tomoyuki Nishita
Visual simulation of compressible snow with friction and cohesion
Proceedings of NICOGRAPH International 2014, pp. 35-42, Gotland (Sweden), June 2014
Recent advances in physically-based simulation have made it possible to simulate various kinds of natural phenomena. However, characteristic behavior of accumulated snow while being compressed due to pressure has been insufficiently simulated merely with a height field approximation. In this paper, we propose a new method for simulating compressible snow by approximating snow as a set of porous snow particles. We introduce a new parameter called durability for each porous snow particle, which represents the rate of undamaged snow structures. The compression of accumulated snow is achieved by absorbing the impact from solids on the snow by taking the durability of snow particles into account. In addition to the compressibility, we incorporate friction and cohesion into our simulation framework to represent various effects of accumulated snow. For enhanced visual reality, fine scale simulations are performed as a post-processing. Several examples demonstrate the versatility of our method.


Yasunari Ikeda, Issei Fujishiro
An object space approach to shadowing for hair-shaped objects
in Proceedings of ACM SIGGRAPH 2014 Posters, Vancouver (Canada), December 2014 [DOI: 10.1145/2614217.2633392]
Three-dimensional objects can be rendered more realistically with their shadows. Commonly-used shadowing methods based on textures with depth values are unfortunately likely to cause aliasing, which is usually ameliorated by such image-space post-processing as neighboring pixel averaging or variance-based smoothing. However, spatial/temporal aliasing can still be observed in pieces and films of work when bundles of thin strands like human hairs are targeted. We can generate sharp shadows even from such intricate shapes if we suitably move their vertices or expand their mesh at the sacrifice of extra computation. Our method attempts to tackle this type of aliasing problem in a simpler manner by generating anti-aliased shadow splats in the object space.


井阪 建, 藤代 一成
NICOGRAPH2014(オーラル発表・査読付), 愛知工業大学 (愛知県), 2014年11月 [NICOGRAPH2014優秀論文賞]

金子 徳秀, 高橋 玲央, 藤代 一成
映像情報メディア学会・画像電子学会・芸術科学会 映像表現・芸術科学フォーラム2015(オーラル発表・査読付), 早稲田大学国際会議場 (東京都), 2015年3月 [映像表現・芸術科学フォーラム2015口頭発表優秀賞(Webと画像・画像生成)]

佐野 昂洋, 藤代 一成
映像情報メディア学会・画像電子学会・芸術科学会 映像表現・芸術科学フォーラム2015(オーラル発表・査読付), 早稲田大学国際会議場 (東京都), 2015年3月

北見 翔, 藤代 一成
映像情報メディア学会・画像電子学会・芸術科学会 映像表現・芸術科学フォーラム2015(オーラル発表・査読付), 早稲田大学国際会議場 (東京都), 2015年3月

芳賀 直樹, 中山 雅紀, 藤代 一成
映像情報メディア学会・画像電子学会・芸術科学会 映像表現・芸術科学フォーラム2015(ポスター発表), 早稲田大学国際会議場 (東京都), 2015年3月 [映像表現・芸術科学フォーラム2015最優秀ポスタ賞(画像生成・システム)][映像表現・芸術科学フォーラム2015企業賞(スクウェア・エニックス)]

藤代 一成, 斎藤 隆文,乃万 司,高橋 成雄,馬場 雅志,宮田 一乘
<<改訂新版 コンピュータグラフィックス>>の狙い
情報処理学会研究報告, 2015年2月 [第158回情報処理学会グラフィクスとCAD研究会優秀研究発表賞]

村岡 遼太, 藤代 一成
情報処理学会 音楽情報科学研究会第105回研究発表会, 2014年11月

池田 泰成, 藤代 一成, 松岡 徹
Visual Computing/グラフィクスとCAD合同シンポジウム2014(ポスタ発表), 2014年6月

井阪 建, 藤代 一成
Visual Computing/グラフィクスとCAD合同シンポジウム2014(オーラル発表・査読付), 2014年6月

藤代 一成, 渡辺 一帆, 高橋 成雄, Hsiang-Yun Wu
文部科学省科学研究費補助金新学術領域研究「スパースモデリングの深化と高次元デー タ駆動科学の創成」, 2014年12月

田倉 昌和, 茅 暁陽, 藤代 一成
第 77 回情報処理学会全国大会, 2015年3月

鹿間 脩斗, 藤代 一成
Cubwer: インタラクティブな設計とシミュレーションによる組上げ構造上の動きの同期
第 77 回情報処理学会全国大会, 2015年3月

高橋 玲央, 藤代 一成
第 77 回情報処理学会全国大会, 2015年3月

堀江 康晃, 藤代 一成
3 次元頭髪モデルにおける染色・褪色のビジュアルシミュレーション
第 77 回情報処理学会全国大会, 2015年3月

小林 杏理, 藤代 一成
第 77 回情報処理学会全国大会, 2015年3月

佐原 淳允, 藤代 一成
第 77 回情報処理学会全国大会, 2015年3月


藤代 一成(モデレータ), 伊藤 貴之, 小山田 耕二, 瀬尾 拡史, 田中 覚, 寺門 和夫(パネリスト), 竹島 由里子(サブモデレータ)
日本版 可視化研究開発の課題トップ 10(パネルディスカッション)
日本学術会議公開シンポジウム 可視化 ビッグデータ時代の科学を拓く, 2014年9月

藤代 一成
第 5 回情報可視化研究室合同合宿, 2014年9月

藤代 一成
SIGGRAPH2014 参加報告 —コンピュータグラフィックスの最新事情と動向
アーク情報システム, 2014年10月

藤代 一成
CG の技術動向 – 書籍「コンピュータグラフィックス」から見る技術的進展 –
CG–ARTS 人材育成「技術者交流」セミナー「日本のハイエンドグラフィックスの未来!~突き進む最先端~」, 2015年1月

藤代 一成
科学入門講座(出張講義), 2015年3月


藤代 一成, 上田 和英, 茅 暁陽, 豊浦 正広, 杉浦 篤志, 竹島 由里子, 早瀬 敏幸
平成 25 年度共同利用・共同研究拠点「流体科学研究拠点」活動報告書, 2014年11月


井阪 建, 藤代 一成
芸術科学会 NICOGRAPH2014 優秀論文賞, 2014 年 11 月 4 日

金子 徳秀, 高橋 玲央, 藤代 一成
映像表現・芸術科学フォーラム 2015 口頭発表優秀賞(Web と画像・画像生成), 2015 年 3 月 14 日

芳賀 直樹, 中山 雅紀, 藤代 一成
SeeGroove: 可視化を介したグルーヴの学習支援
映像表現・芸術科学フォーラム 2015 最優秀ポスター賞(画像生成・システム), 2015 年 3 月 14 日

芳賀 直樹, 中山 雅紀, 藤代 一成
SeeGroove: 可視化を介したグルーヴの学習支援
映像表現・芸術科学フォーラム 2015 企業賞(スクウェア・エニックス), 2015 年 3 月 14 日

高橋 玲央
高橋 玲央,金子 徳 秀,藤代 一成:「キャラクタ固有の動作を反映したモーションリターゲティング手法の提案」
第 77 回情報処理学会全国大会 学生奨励賞, 2015 年 3 月 18 日


藤代 一成(編集委員長)
画像情報教育振興協会編,改訂新版 コンピュータグラフィックス
2015 年 3 月,総 443 頁


藤代 一成
ビジュアルコンピューティング特集号,画像電子学会誌,Vol. 43, No. 3, pp. 279–366
2014 年 8 月 [ゲスト編集委員長前書き:「ビジュアルコンピューティング特集号の発行にあたって」, p. 279


Issei Fujishiro
Contractible parallel coordinates for sparse modeling
Dagstuhl Seminar on Scientific Visualization 2014 , Schloss Dagstuhl, Waderm, 2014 年 6月