Details of a Researcher - Fujishiro, Issei

Papers - Fujishiro, Issei

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Understanding viewers’ involuntary behaviors for adaptive digital signage

NAGAO Ken, FUJISHIRO Issei

Symposium on Applied Perception 2013 (ACM) 2013.08

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

Digital signage has been getting more popular due to the recent development of underlying hardware technology and improvement in installing environments. In order to deliver a message from a sender effectively, it is necessary to check up viewers’ evaluations towards the content actually displayed by the digital signage and utilize the evaluations to make it more adapted to the local viewers’ tastes. In our study, we have attempted to take advantage of viewers’ involuntary behaviors. In front of digital signage, viewers involuntarily behave in various ways, and these behaviors come directly from their minds. Therefore, if digital signage can recognize these behaviors, it can understand viewers’ actual feelings towards digital
signage. In order to prove the effectiveness of the method, we have developed a system which displays academic conference posters and automatically makes their content adapted to local viewers. The system utilizes viewers’ involuntary behaviors, and makes use of a genetic algorithm for automatic updates of the content.

Ontology-based support of visualization workflow design for structural analysis

TAKESHIMA Yuriko, FUJISHIRO Issei

Transactions of 22nd International Conference on Structural Mechanics in Reactor Technology (SMiRT-22) (International Association for Structural Mechanics in Reactor Technology (IASMiRT)) Paper ID: 816 2013.08

Research paper (international conference proceedings), Joint Work, Accepted

Computer visualization has become a crucial component of data analysis, and so-called Modular Visualization Environments (MVEs) have been used in a variety of analytical disciplines. Even so, scientists and engineers who are not visualization experts have some difficulty in selecting and applying visualization techniques that best suit their purposes. To address this problem, we have extended our visualization ontology to develop a visualization system that helps the users select and execute suitable visualization techniques. In this paper, we attempt to further extend our ontology towards a particularly important domain of visualization: structural analysis. The resulting system uses a refined Wehrend
Matrix to represent users’ goals and requirements, and to search the knowledge-base for appropriate visualization workflows. The system also allows the users to browse successful examples maintained in the case repository, thereby supporting “design by example”. Three practical structural analysis examples are presented to illustrate the usefulness of our prototype system.

A GPU-accelerated Visual Simulator of Whirlwind

NAKAJIMA Satoshi, FUJISHIRO Issei

The Journal of the Institute of Image Electronics Engineers of Japan (IIEEJ) 42 ( 4 ) 505 - 508 2013.07

Research paper (scientific journal), Joint Work, Accepted, ISSN 1348-1306

In this short paper, we report how we accelerated a visual simulator of whirlwind with a GPU. In the simulation part, precise simulation can be carried out even with a coarse grid by adding smallscale turbulence on each particle to air flow roughly computed using a grid-based method. We decided to parallelize the grid-based method using CUDA. The rendering part was also accelerated by applying GLSL shader programming to a simplified variant of particle-based volume rendering to delineate changes in the translucency of the whirlwind. The accelerated visual simulator possesses its own user interface, which takes full advantage of the obtained fast performance, to allow the users to interactively control the whirlwind’s trajectory and interactions with other objects.

虫食い跡をもつ葉テクスチャの生成手法の提案

KANEKO Norihide, FUJISHIRO Issei

Visual Computing/グラフィクスとCAD合同シンポジウム2013 (画像電子学会，情報処理学会，映像情報メディア学会) 2013.06

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

本発表では葉の経時的変化として葉の虫食い跡に着目し, 主要な葉脈をユーザの入力に沿わせるようにして生成する一方, 細かな葉脈を手続き的に生成することで, テクスチャとして入力された葉の葉脈に一致する葉脈モデルを作成した. 昆虫はかたい箇所を避けるようにして摂食活動を行うことから, 作成した葉脈モデルに対して靱性分布を適用し, 昆虫の摂食行動に関係する各種化学因子の影響と葉脈の高靱性箇所の回避を考慮した昆虫の行動プロセスモデルを構築し, 作成した葉脈モデル上で昆虫の摂食行動を再現することを試みた.以上の処理で作成した食害を受けた葉のマップと葉身のテクスチャを用いてさらに虫食い跡周辺からの水分の蒸発を考慮した枯化の処理を行うことで, より現実に即した葉のテクスチャを作成することが可能となった.

布における折り目生成のビジュアルシミュレーション

KITAMI Sho, FUJISHIRO Issei

Visual Computing/グラフィクスとCAD合同シンポジウム2013 (画像電子学会，情報処理学会，映像情報メディア学会) 2013.06

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

「衣・食・住」の「衣」を構成する布の表現は, CG の分野においてさまざまな研究が行われてきた. 映像作品に生活感を与える要素として, 布のシミュレーションはひじょうに重要な研究分野であるといえる. しかし, 既存研究の多くは, 「いかに写実的な布を表現するか」に焦点が当てられており, 加工された, または生活のなかで使い込まれたような布の研究はあまり報告されていない. そこで本論文では, 布の折り目の動的な生成モデルを提案する.

3×3パネル分割法を用いた環境可視化システム

SANO Takahiro, FUJISHIRO Issei

Visual Computing/グラフィクスとCAD合同シンポジウム2013 (画像電子学会，情報処理学会，映像情報メディア学会) 2013.06

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

画像から得られる情報は時にかなり断片的である. そのような画像群から被写体の本質を誤解なく感得するには,被写体を取り巻く状況全体に対する理解が必要となる. 本研究では, 被写体同士の関係を抽象的に表現する層状グラフを構築し, 画像データに収められた被写体の状況を大局的に可視化する. また, この層状グラフによって半構造画像データを統一的に扱うことで, その半構造性を補う. 層状グラフに配置された画像データの閲覧には, 縦横3×3の矩形領域に区切られた表示インタフェースを用いる.

基礎的リズムパターンにおけるグルーヴの可視化

HAGA Naoki, NAKAYAMA Masanori, FUJISHIRO Issei

Visual Computing/グラフィクスとCAD合同シンポジウム2013 (画像電子学会，情報処理学会，映像情報メディア学会) 2013.06

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

演奏の質にかかわる高次な音楽特徴であるグルーヴとは, 楽曲におけるリズムや音のうねり, 乗りなどを包括した概念であり, よい演奏には不可欠の要素とされる. しかし, 演奏において自在にグルーヴを表現するためには, ひじょうに多くの音楽経験を積む必要がある.そこで本研究では, グルーヴを可視化することで, ユーザのグルーヴ学習をより効率的にするための手法を提案する. 具体的には, グルーヴの要素となる音楽パラメータと超楕円体のパラメータとを対応付ける独自のマッピングを行った. また, そのマッピングに基づき,MIDI を入力として超楕円体のアニメーションとストロボ写真風の静止画像を生成した.

CosmicAI: Generating Sky Images Through Content-Based Search,Flexible Composition,and Work Sharing

MITANI Takanobu, FUJISHIRO Issei

The Journal of The Institute of Image Information and Television Engineers (ITE) 67 ( 6 ) J180 - J185 2013.05

Research paper (scientific journal), Joint Work, Accepted, ISSN 1881-6908

We propose a novel system, called CosmicAI, for providing an intuitive and efficient way to synthesize 2D sky images. The system utilizes a collection of high-quality proprietary sky part images for backgrounds, clouds, and the moon, and allows the users to generate their own sky images effectively through attribute-based retrieval of these sky parts images and their flexible layout and natural composition based on a new cloud extraction algorithm and an original filter for partly-overlapping pixels. Its one click search and active composition play an important role for realizing rapid image synthesis. Moreover, CosmicAI is capable of collecting via the Internet and searching for composite works. This function promotes group works by giving incentives to users with unclear design motives for generating a wide variety of sky images.

A topologically-enhanced juxtaposition tool for Hybrid Wind Tunnel

TAKESHIMA Yuriko, FUJISHIRO Issei, TAKAHASHI Shigeo, HAYASE Toshiyuki

Proceedngs of IEEE Pacific Visualization Symposium 2013 (IEEE Computer Society) 113-120 2013.02

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

We have developed a hybrid wind tunnel, where 2D measurementintegrated (MI) simulation, which utilizes actual data acquired from real air flow behind a square cylinder, plays an important role in improving the accuracy of the numerical analysis. The wind tunnel
requires an accompanying visual analysis tool with which we
can effectively peer into the relationships between the actual and simulated flow fields. In this paper, we attempt to exploit an augmented reality display to that end. The basic idea is to superimpose the computationally-visualized MI simulated pressure field onto the actual flow velocity structure physically-visualized with oil misttraced streaklines instantaneously. Spatial registration of these two visual sources is rather straight-forward since the fixed cylinder of the wind tunnel is easily identified, whereas visualizing the MI
simulated pressure field can be characterized with a sophisticated scheme based on differential topology. Considering the fact that vortex centers are located at local minima in the pressure field, and each minimum is surrounded by a derived topological feature called
ridge cycle, we can colorize the field adaptively and keep track of Karman vortex streets robustly, regardless of drastic change in the Reynolds number of the flow field.

Making digital signage adaptive through a genetic algorithm - Utilizing viewers’ involuntary behaviors -

NAGAO Ken, FUJISHIRO Issei

Proceedings of the International Conference on Computer Vision Theory and Applications 2013 (INSTICC) 2 54-59 2013.02

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

Digital signage has been becoming more popular due to the recent development of underlying hardware technology and improvement in installing environments. In digital signage, it is important to make the content more attractive to the viewers by evaluating its current attractiveness on the fly, in order to deliver the message
from the sender more effectively. Most previous works for this evaluation do not take the viewers’ feeling towards the content into account, and the content is improved manually if needed in an off-line manner. In this
paper, we present a novel method which does not rely on such manual evaluation and automatically makes the content more adapted to the viewers. To this end, we take advantage of the viewers’ involuntary behaviors in front of the digital signage for online updates through the usage of a genetic algorithm.

Research Group Introduction: Fujishiro Laboratory, Department of Information and Computer Science, Faculty of Science and Technology, Keio University

FUJISHIRO Issei

The Journal of the Institute of Image Electronics Engineers of Japan (IIEEJ) 41 ( 4 ) 428 - 429 2012.08

Research paper (scientific journal), Single Work, Lead author, Corresponding author

第17回計算工学講演会報告

NISHIWAKI Shinji, YAMADA Takayuki, ADACHI Taiji, OKAZAWA Shigenobu, FUJISHIRO Issei

計算工学 (日本計算工学会) 17 ( 3 ) 38-40 2012.07

Research paper (scientific journal), Joint Work, ISSN 1341-7622

Optimizing point cloud geometry for 3D aerial display

FUJISHIRO Issei

Microsoft Research CORE7 Project Summary Booklet (Microsoft Japan, Tokyo) 21 - 23 2012.06

Research paper (other academic), Single Work, Lead author, Corresponding author

Realizing a truly three-dimensional (3D) display environment has been an ultimate goal of visual computing communities. Laser-Plasma Scanning 3D Display (LPSD) is one of the most advanced 3D aerial display devices, which can plot a unicursal series of illuminants freely in the air. Though the LPSD device has been repeatedly updated, even the latest version is only capable of drawing a dynamic object at a rate of 5,000 illuminants per second, purely due to the hardware constraint. If we plotted the illuminants at a regular interval with a constant brightness, it might possibly lead to the loss of geometry and/or surface texture of a designed object. In this project, therefore, we attempt to seek a software-based solution to ameliorate this problem by the control of the brightness and density of plotted illuminants in accordance with existing surface descriptors, to convey salient features of 3D shapes with even a limited number of illuminants.

芸術科学フォーラム2012報告

FUJISHIRO Issei

DiVA（芸術科学会誌） 28 3-4 2012.04

Research paper (scientific journal), Single Work

計算美学のすゝめ

FUJISHIRO Issei

DiVA(Digital,Interactive and Visual Arts) (The Society for Art and Science) 28 2 - 2 2012.04

Research paper (scientific journal), Single Work

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, TAKESHIMA Yuriko

平成22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 (東北大学流体科学研究所) ( J10037 ) 79-80 2011.10

Research paper (other academic), Single Work

Previewing volume decomposition through optimal viewpoints

TAKAHASHI Shigeo, FUJISHIRO Issei, TAKESHIMA Yuriko, BI Chongke

Scientific Visualization: Interactions, Features, Metaphors, Dagstuhl Follow-Ups (Dagstuhl Publishing, Germany) 2 Chapter 23 (346-359) 2011.10

Research paper (conference, symposium, etc.), Joint Work, Accepted, ISSN 1868-8977

Understanding a volume dataset through a 2D display is a complex task because it usually contains multi-layered inner structures that inevitably cause undesirable overlaps when projected onto the display. This requires us to identify feature subvolumes embedded in the given volume
and then visualize them on the display so that we can clarify their relative positions. This article therefore introduces a new feature-driven approach to previewing volumes that respects both the 3D nested structures of the feature subvolumes and their 2D arrangement in the projection by minimizing their occlusions. The associated process begins with tracking the topological transitions of isosurfaces with respect to the scalar field, in order to decompose the given volume dataset into feature components called interval volumes while extracting their nested structures. The volume dataset is then projected from the optimal viewpoint that archives the best balanced
visibility of the decomposed components. The position of the optimal viewpoint is updated each time when we peel off an outer component with our interface by calculating the sum of the viewpoint optimality values for the remaining components. Several previewing examples are
demonstrated to illustrate that the present approach can offer an effective means of traversing volumetric inner structures both in an interactive and automatic fashion with the interface.

SPH-based method for interactive flame simulation - Implementation on CPU and GPU

MABUCHI Satoshi, OHNO Yoshio, FUJISHIRO Issei

Proceedings of ASIAGRAPH2011 (Virtual Reality Society of Japan) 41-46 2011.10

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

In this paper, we propose a novel, particle-based flame simulation method, which relies on SPH to simulate the dynamics of flames by introducing a buoyancy term as an external force to the Navier-Stokes equations. The buoyancy term is directly affected by heat generated from a simple chemical reaction model. For efficiency, we adaptively re-sample particles around a flame. We demonstrate that it is possible to execute three-dimensional flame simulations in real-time for typical cases including transition from initial to stable states, and one-way coupling with solid. Our method offers reasonable results on CPU, while more realistic results can be obtained using GPGPU.

Measurement-integrated simulation and visualization of Karman vortex streets in Hybrid Wind Tunnel

TAKESHIMA Yuriko, FUJISHIRO Issei, TAKAHASHI Shigeo, HAYASE Toshiyuki

Proceedings of ASIAGRAPH2011 (Virtual Reality Society of Japan) 35-40 2011.10

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

We have developed a hybrid wind tunnel, where 2D measurement-integrated (MI) simulation, which utilizes actual data acquired from real air flow behind a square cylinder, plays an important role in improving the accuracy of its numerical analysis. The wind tunnel requires an accompanying visual analysis tool with which we can effectively peer into the relationships between the actual and simulated flow fields. In this paper, we attempt to exploit the augmented reality-style display technique to that end. The basic idea is to instantaneously superimpose the computationally-visualized MI simulated pressure field onto the actual flow velocity structure physically-visualized with oil mist-traced streak lines. Space registration of these two visual sources is rather straight-forward since the fixed cylinder of the wind tunnel is easily identified, whereas visualizing the MI simulated pressure field can be characterized with its sophisticated scheme based on differential topology. Considering the facts that vortex centers are located at local minima in the pressure field, and each minimum is surrounded by a derived topological feature called ravine cycle, we can colorize the field adaptively and keep track of Karman vortex streets robustly, regardless of drastic change in the Reynolds number of the flow field.

SPH-based Real-time Flame Simulation

MABUCHI Satoshi, FUJISHIRO Issei, OHNO Yoshio

Journal of IPSJ (IPSJ) 52 ( 10 ) 2965-2972 2011.10

Research paper (scientific journal), Joint Work, Accepted, ISSN 1882-7764

In this paper, we propose a novel particle-based flame simulation method, which relies on SPH to simulate the dynamics of flame by introducing a buoyancy term as an external force to Navier-Stokes equation. The buoyancy term is directly affected by heat generated from a simple chemical reaction model. Good interchangeability allows us to easily couple our method with existing SPH source codes. For efficient execution, we adaptively re-sample particles around flame. We demonstrate three-dimensional simulations in real-time for typical cases including transition from initial to stable states, and one-way coupling with solid.

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