Details of a Researcher - Fujishiro, Issei

Papers - Fujishiro, Issei

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A recursive procedure model for improving appearance of clothes with fiber-level details

IKEDA Yasunari, FUJISHIRO Issei

Proceedings of the 5th International Workshop on Image Electronics and Visual Computing (IEVC2017) (IIEEJ) 2017.03

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

Making realistic yarn objects, a common material for textile, without losing details is a challenging issue. Recent methods for modeling yarn can be classified into two categories: volume-based methods and fiber-based ones. Among them, one of the latest fiber-based methods attempts to reconstruct twisted fibers from CT (Computed Tomography) images to improve the details of yarn models. While this method dramatically improves the details, mainly because of the limited resolution of the CT scanner, the fluff and fuzz of the yarn still cannot be obtained. Our goal is to realize the fluff and fuzz of yarn. To that end, we developed an extension method to attach microfibers to each fiber of the yarn. The method approximates the distribution of microfibers by recursively using statistical data. In this paper, we discuss the preliminary design of the method.

Parameter-setting for topology-accentuated transfer function for volume raycasting

TAKESIMA Yuriko, TAKAHASHI Shigeo, FUJISHIRO Issei

Proceedings of Seventh International Workshop on Topological Methods in Visualization (TopoInVis2017) 2017.02

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

The design of automatic transfer functions for volume rendering is a perennial problem in volume visualization. For the last two decades, a variety of design methodologies has been proposed. However, sensitive adjustment of related
control parameters remains entrusted to users, because rendering conditions such as the size of a target dataset and sampling distance of ray casting differ on a caseby-
case basis. Our group proposed one-dimensional transfer functions to accentuate topological changes in the scalar field of the target dataset. However, the method forces us to determine the actual control parameter values for the transfer functions in an empirical manner. In this extended abstract, we propose a supplementary mechanism to judiciously define an appropriate profile of opacity values. In our approach, the height and width of the hat functions to accentuate feature isosurfaces are determined according to the number of voxels belonging to the relevant topologically equivalent scalar field interval. The feasibility of the proposed method is evaluated by application to three kinds of volume dataset.

空間局在オーディオの視線追跡選択：エンタテイメント応用に向けて

清水文也，藤代一成

画像関連学会連合会第3回秋季大会予稿 (画像関連学会連合会) 2016.11

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

デジタルサイネージやヘッドマウントディスプレイなど, さまざまな日常生活レベルのデバイスのインタフェースとして視線追跡を利用する手法が数多く研究されている. 一方で, 視覚インタフェースはオーディオとの融合にも大いに可能性があると考えられる. 本研究では, 一般的なカメラを1 台だけ用いて得られたユーザの視線方向によって, 再生するオーディオデータを選択可能にする手法を提案する. 視線追跡をベースとしたオーディオインタフェースを開発することで, ユーザが対象物に集中しやすい環境を作り出し, 臨場感を提供する
ことを目的とする. また，美術館における予備実験や博物館のオーディオガイドへの適用を前提とした予備実験を行う.

呼吸動作キャプチャによる生命感の表現：ボーンモデルから3Dメッシュモデルへの拡張に向けて

清水貴大，中山雅紀，藤代一成

画像関連学会連合会第3回秋季大会予稿 (画像関連学会連合会) 2016.11

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

運動中の呼吸データをキャプチャし，そのデータを適用したアニメーションを作成する．本研究では，モーションデータに合わせて実際に運動し，その時の呼吸動作をキャプチャする．この2 つのデータを，3D アバタへの前段階として，肺・横隔膜モデルを付与した拡張ボーンモデルに適用し，呼吸データを適用していないボーンモデルに比べて，力感や間合いの表現が向上したアニメーションを作成する．さらに，そのアニメーションを3D メッシュモデルへ拡張する方法を提案する．

マーチングバンドにおける演奏者個人を対象とした移動経路の計量可視化

堀井絵里，藤代一成

NICOGRAPH2016 (芸術科学会) 119 - 120 2016.11

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

吹奏楽活動のなかには，演奏者が演奏しながら定められた経路に従って歩くことにより隊形を作る，マーチングという演奏行為が存在する．本ポスタでは，市販のビデオカメラにより撮影されたマーチングの動画像から，演奏者の移動経路の精度を視覚的に解析するシステムを提案した．本システムは，動画像に映っている演奏者個人の移動経路を，物体追跡アルゴリズムを用いて同定し，さらにその演奏者が歩くべき経路と実際の経路を照らし合わせることにより，誤差を表示する．演奏者の選択や，移動経路が可視化された動画像の再生は，専用ユーザインタフェースを介して容易に実行できる．対象とする演奏者が他の演奏者や楽器により遮蔽された場合でも，その演奏者が動画像に再び現れるまで，それまでの移動ベクトルを用いて位置を推測することにより頑健に追跡を続ける．本システムにより演奏者は自分の改善点を知ることができ，その結果マーチング中の隊形の完成度を高めることが可能となった．

直接操作による2次元流体の簡易形状設計

早川雄登，藤代一成

NICOGRAPH2016 (芸術科学会) 115 - 116 2016.11

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

直接操作によって2次元流体を簡易に作成できるインタフェースを提案した．本ポスタでは，流体シミュレーションおよび流体制御に用いるパラメータ調整を特定のモーションデータに対応させた直接操作によって，直感的な流体制御を試みた．これにより，流体シミュレーションの知識を必要とせず，2 次元流体を簡易に形状設計することが可能となった．モーションデータの取得には，Leap Motion を用いた．特定のモーションデータをコマンドとして識別し，2次元空間上でコマンドに応じた流体シミュレーションを実行した．

3次元頭髪モデルにおけるブリーチのビジュアルシミュレーション

堀江康晃，藤代一成

NICOGRAPH2016 (芸術科学会) 117 - 118 2016.11

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

頭髪の色を変えるヘアカラーリングは, 施術後の髪色を事前に見ることができないため, 想像していたものとはかけ離れた髪色になることが多いという問題が生じる. 本研究では, ヘアカラーリングのなかでも毛髪の色を脱色するブリーチという方法を対象とし, ユーザがブリーチを行う時間を指定することで, 施術後の髪色を3D頭髪モデルにより提示することを目的とする. 毛髪の色が2種類のメラニン色素の量により決定する事実に着目し, そのメラニン量を表すパラメタを物理ベースの頭髪シェーディングモデルに組み込み, このパラメタ値により頭髪の色を操作可能にした. そして, 実際の毛髪のブリーチ実験による髪色変化量データをもとにメラニンパラメタ値を変化させることで, ブリーチによる頭髪の色変化を写実的に表現するビジュアルシミュレーションを実現した.

Visual analysis of rugby matches: Pixel-oriented visualization and evaluation indices

ISHIKAWA Yusuke, FUJISHIRO Issei

Proceedings of IEEE VIS2016 Posters (IEEE Computer Society) 2016.10

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

SeeGroove2: An orbit metaphor for interactive groove visualization

JIN Norihiko, HAGA Naoki, FUJISHIRO Issei

Proceedings of 2016 International Conference on Cyberworlds (IEEE Commputer Society) 131 - 134 2016.09

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

Groove, the sense of rhythmic feel or musical swing, is one of the most essential factors of a good musical performance.
Groove visualization can help players/listeners acquire groove sensation and share impressive expressions of music, regardless of personal hearing ability or musical sense. In this paper, we present SeeGroove2 as an extension of our previous system SeeGroove, by featuring a new groove visualization scheme relying on an orbit metaphor. Rhythm patterns are visually interpreted as various orbital shapes by plotting each played note as an orbiting circle and smoothly interpolating them. Thanks to the adoption of a module-oriented and multi-threaded architecture, the system can change the orbit shapes interactively as the music performance progresses, and thereby the user can feel groove transitions in the music on the fly.

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An affective video generation system supporting impromptu musical performance

KOBAYASHI Anri, FUJISHIRO Issei

Proceedings of 2016 International Conference on Cyberworlds (IEEE Commputer Society) 17 - 24 2016.09

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

When a musical instrument player performs music, the accompanying visual information can have a significant effect on the performance. For example, several players in a
jam session may change their style of playing immediately by closely examining the co-players’ expressions and behaviors and predicting their emotion and intention on the fly. In this paper, we propose a system that generates videos in response to the impromptu performance of a single musical instrumental player. The system evaluates the input signals in an affective way and generates a corresponding video based on the results of the evaluation. The player tends to change his/her performance while being inspired by the generated video and giving further triggers for the system to modify the video. The system aims to establish such an affective loop, where it is expected to act as a “co-player” who continues having an influence on the performance of the real player. The final goal of this study is to improve the quality of the player’s performing experience through such interactions between the player and the system. By conducting a user evaluation, it was proven that we were able to inspire an amateur guitarist as the subject through the affective video generation and provide a cyberworld where he is allowed to experience a better performance than playing alone.

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TimeTubes: Visualization of polarization variations in blazars

UEMURA Makoto, ITOH Rhosuke, XU Longyin, NAKAYAMA Masanori, WU Hsiang-Yun, WATANABE Kazuho, TAKAHASHI Shigeo, FUJISHIRO Issei

Galaxies (MDPI) 4 ( 3 ) 2016.09

Research paper (scientific journal), Joint Work, Accepted

Optical polarization provides important clues to the magnetic field in blazar jets. It is easy to find noteworthy patterns in the time-series data of the polarization degree (PD) and position angle (PA). On the other hand, we need to see the trajectory of the object in the Stokes QU plane when the object has multiple polarized components. In this case, ironically, the more data we have, the more difficult it is to gain any knowledge from it. Here, we introduce TimeTubes, a new visualization scheme to explore the time-series data of polarization observed in blazars. In TimeTubes, the data is represented by tubes in 3D (Q, U, and time) space. The measurement errors of Q and U, color, and total flux of objects are expressed as the size, color, and brightness of the tubes. As a result, TimeTubes allows us to see the behavior of six variables in one view. We used TimeTubes for our data taken by the Kanata telescope between 2008 and 2014. We found that this tool facilitates the recognition of the patterns in blazar variations; for example, favored PA of flares and PA rotations associated with a series of flares.

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ビジュアル情報処理のパイプラインと研究スパイラル再考

FUJISHIRO Issei

映像情報メディア学会技術報告 (映像情報メディア学会) 40 ( 7 ) 9 - 10 2016.08

Research paper (conference, symposium, etc.), Single Work, ISSN 1342-6893

本講演は，2016年8月26日に北海道函館市公立はこだて未来大学で開催された画像電子学会第278回研究会（共催：映像情報メディア学会映像表現&コンピュータグラフィックス研究会）の招待講演である．ここでは，具体的なビジュアル情報処理の研究事例を参照し，視覚データの生産から消費までパイプラインを拡大するとともに，20年周期の研究スパイラルを意識することの学術的意義について平易に解説した．

LMML: Describing injuries for forensic data visualization

BOUSSEJRA Malik Olivier, ADACHI Noboru, SHOJO Hideki, TAKAHASHI Ryohei, FUJISHIRO Issei

Proceedings of NICOGRAPH International 2016 (IEEE Computer Society) 153 - 153 2016.07

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

Justice needs efficient tools to exact an accurate and fair
judgment. Our research aims at developing a subset of those
tools for storage and utilization of autopsy data (autopsy
being the medical examination to identify the cause of death, through LMML, the Legal Medicine Mark-up Language,
a mark-up language whose syntax and semantics are designed
according to the operative procedure certified by the
Japanese Society of Legal Medicine. Using an interface we
developed, the user (i.e. a medical examiner, a prosecutor or a lawyer) can manage, create, edit LMML files and output
autopsy visualizations. The scope of this poster was focused on how injuries are described within the framework.

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TimeTubes: Design of a visualization tool for time-dependent, multivariate blazar dataset

XU Longyin, NAKAYAMA Masanori, WU Hsiang-Yun, WATANABE Kazuho, TAKAHASHI Shigeo, UEMURA Makoto, FUJISHIRO Issei

Proceedings of NICOGRAPH International 2016 (IEEE Computer Society) 15 - 21 2016.07

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

Blazars are active galactic nuclei whose relativistic jets ejected from the central black hole are pointing toward the Earth. Astronomers have attempted to classify blazars, but analyzing the time-dependent multivariate datasets with conventional visualization methods, such as scatter plot matrices, is difficult. This paper presents TimeTubes, a new visualization scheme that allows astronomers to analyze dynamic changes in and feature causality among the multiple time-varying variables. We target six representative time-varying variables from the originals, including two polarization-related parameters and their corresponding errors, intensity, and color. The four polarization parameters with a common time stamp are transformed to an ellipse, and a series of such ellipses are aligned in parallel along the time line to form a volumetric tube in 3D space. The resulting tube is then colorized by the
observed intensities and colors of the blazar. We designed a
designated interface with nine functions to control the view of the tube interactively. The usability of TimeTubes was discussed with feedback from astronomers.

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LMML: Initial developments of an integrated environment for forensic data visualization

BOUSSEJRA Malik Olivier, ADACHI Noboru, SHOJO Hideki, TAKAHASHI Ryohei, FUJISHIRO Issei

EuroVis 2016 - Short Papers (The Eurographics Association) 2016.06

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

Fighting against crime is paramount to any society, maybe more today than ever before. Tools to fight and elucidate crime are rooted in forensic science. Through the autopsy of a body, we can answer a whole range of questions as to how death happened and come up with explanations and counter-measures so that the same dire circumstance does not happen again. Now, because the reports collecting the data are written manually, the recording of the data collected through traditional autopsy still is a cumbersome, time-consuming task. Our framework, based on a mark-up language (that we dubbed ''LMML'') to store, describe and arrange forensic data, aims at overcoming those issues. Our contribution is twofold: the design of the syntax and semantics of LMML, and the conception of an interface to create, edit, analyse or query files written in that language. Thus, this framework allows quicker, smoother input of forensic data, for better automation and visualization thereof, so that they can be used by medical examiners, investigators, as well as judicial courts.

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Naked-eye 3D imaging through optical illusion using L-shaped display surfaces

ISAKA Takeru, FUJISHIRO Issei

The Journal of The Institute of Image Information and Television Engineers (The Institute of Image Information and Television Engineers) 70 ( 6 ) J143 - J146 2016.05

Research paper (scientific journal), Joint Work, Accepted, ISSN 1342-6907

安価ながら効果的な裸眼立体表示を可能にするディスプレイシステムの開発は，ビジュアルコンピューティング分野におけるきわめて重要な課題の一つである．ホログラフィに代表されるような，ハードウェアの描像原理を高度化することで発展してきた既存システムは，現時点では生成映像の品質を向上させにくいという課題がある．そこで本論文では，複数枚の汎用ディスプレイを直交に配置したL 字型の表示空間上で，陰影と運動視差を中心とする単眼性の奥行
き知覚要因を利用して，一般的な2D グラフィックスと同等の解像度と明度をもつ，個人向けの裸眼立体映像を手軽に生成する手法を提案する．ユーザの視線追跡により本手法の有効性を確認する予備的評価についても報告する．

複素パラメータによる平面曲線の解析的な延長についてとそのインタラクティブアートへの応用 —実世界は果たして高次元世界の断面になっているか？

宮澤篤，中山雅紀，藤代一成

日本図学会2016年度春季大会学術講演論文集 (日本図学会) 83 - 88 2016.05

Research paper (conference, symposium, etc.), Joint Work, ISSN 2189-0072

よく知られているように，方程式x^2+1=0は実数の範囲では解をもたない．そこで，関係式i^2+1= 0を満たすような虚数単位iを含むように数の次元を1つ上げて， a+ib の形の複素数を得たのであるが，たとえば交流回路のインピーダンス計算が複素数によって楽に行えることや，「虚数の光」ともよばれるエバネッセント（近接場）光が，マクスウェル方程式の平面波解（複素数で書かれる）として導かれることなど，「次元を上げると，こんなにいいことがある」例が数多く示されている．言い換えると，新しい理論やものの見方は，数理科学の視野を拡大するものでなければならないが，たとえそれらが合理的に有用なものとして受け入れられたとしても，そもそも2次元しか見えない3次元空間の住人が4次元以上の直積空間を理解しようとするのは容易なことではない．ここでは，4次元図形の直観像を得るための1つの方法として，複素初等関数の可視化と，その応用である「複素パラメータによる平面曲線の解析的な延長」について論じてみたい．

Asymmetric biclustering with constrained von Mises-Fisher models

WATANABE Kazuho, WU Hsiang-Yun, TAKAHASHI Shigeo, FUJISHIRO Issei

Jounal of Physics: Conference Series 1742-6596 (IOP Publishing) 699 ( 012018 ) 2016.04

Research paper (scientific journal), Joint Work, Accepted, ISSN 1742-6596

As a probability distribution on the high-dimensional sphere, the von Mises-Fisher (vMF) distribution is widely used for directional statistics and data analysis methods based on correlation. We considered a constrained vMF distribution for block modeling, which provides a probabilistic model of an asymmetric biclustering method that uses correlation as the similarity measure of data features. We derived the variational Bayesian inference algorithm for the mixture of the constrained vMF distributions. It was applied to a multivariate data visualization method implemented with enhanced parallel coordinate plots. This paper was presented at The International Meeting on High-Dimensional Data-Driven Science (HD3-2015), held in Kyoto in December 2015.

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Data-driven approach to Type Ia supernovae: Variable selection on the peak luminosity and clustering in visual analytics

UEMURA Makoto, KAWABATA Koji S., IKEDA Shiro, MAEDA Keiichi, WU Hsiang-Yun, WATANABE Kazuho, TAKAHASHI Shigeo, FUJISHIRO Issei

Journal of Physics: Conference Series (IOP Publishing) 699 ( 012009 ) 2016.04

Research paper (scientific journal), Joint Work, Accepted, ISSN 1742-6596

Type Ia supernovae (SNIa) have an almost uniform peak luminosity, so that they are used as "standard candle" to estimate distances to galaxies in cosmology. In this article, we introduced our two recent works on SNIa based on data-driven approach. The diversity in the peak luminosity of SNIa can be reduced by corrections in several variables. The color and decay rate have been used as the explanatory variables of the peak luminosity in past studies. However, it is proposed that their spectral data could give a better model of the peak luminosity. We use cross-validation in order to control the generalization error and a LASSO-type estimator in order to choose the set of variables. Using 78 samples and 276 candidates of variables, we confirmed that the peak luminosity depends on the color and decay rate. Our analysis does not support adding any other variables in order to have a better generalization error. On the other hand, this analysis is based on the assumption that SNIa originate in a single population, while it is not trivial. Indeed, several sub-types possibly having different nature have been proposed. We used a visual analytics tool for the asymmetric biclustering method to find both a good set of variables and samples at the same time. Using 14 variables and 132 samples, we found that SNIa can be divided into two categories by the expansion velocity of ejecta. Those examples demonstrate that the data-driven approach is useful for high-dimensional large-volume data which becomes common in modern astronomy. This paper was presented at The International Meeting on High-Dimensional Data-Driven Science (HD3-2015), held in Kyoto in December 2015.

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Enabling interactive scientific data visualization and analysis with see-through HMDs and a large tiled display

NAGAO Ken, YE Yucong, WANG Chuan, FUJISHIRO Issei, MA Kwan-Liu

Proceedings of IEEE VR2016 Workshop on Immersive Analytics (IEEE Computer Society) 2016.03

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

Validation and exploration of the data generated by large-scale scientific simulations rely on sophisticated visualization and analysis tasks. With the advancement of supercomputing, the growing scale and complexity of the data make some of these tasks challenging, which demands new hardware and software solutions. We believe it is possible to address some of the challenges by utilizing the increasingly affordable see-through head mounted display (HMD) devices together with a low-cost tiled HDTV display. With the tiled display to provide a high-resolution overview of the data, the user can freely choose a small area to explore and analyze using a see-through HMD in stereoscopic 3D with gesture input. During such local exploration and detail data analysis, the user can apply a newly derived visualization parameter setting to the large tiled display for a new overview. In this way, computational costs become more manageable because realtime rendering and response are only required to cover a small screen space and a subset of the data. In our current study, we focus on supporting immersive isosurface and streamline visualization and analysis of 3D flow field data. In this workshop paper, we presented our preliminary design and results, and we also discussed our further development and evaluation plan.

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