Details of a Researcher - Fujishiro, Issei

Papers - Fujishiro, Issei

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A Method for generating piled fabrics with fluff-Level details of geometry

IKEDA Yasunari, TOGO Yutaro, FUJISHIRO Issei

NICOGRAPH2017 (The Society for Art and Science) 17 - 24 2017.11

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

Immersive math environment continuable to cross-sectional complex projective 2-space

MIYAZAWA Atsushi, NAKAYAMA Masanori,FUJISHIRO Issei

Full Paper Proceedings of the Eleventh Asian Forum on Graphic Science F40-1 - F40-6 2017.08

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

As is well-known, in quantum mechanics the complex wave plays an essential role, which can explain the natural phenomena very well. In other words, it can be said that the rules of nature are written with logic using complex numbers. We are accustomed to the convenience of
visualizing the overall behavior of a function by means of its graph. In the case of a complex function, however, this approach has not seemed workable for a long time because to depict a pair of complex numbers (an input z and the output of a function f) we would need four dimensions. Especially in mathematical visualization, we have demonstrated thus far that how the fourth dimension is conceptualized seems to be successfully justified by using a cross section and a projection of an object appropriately, described in terms of polar coordinates (instead of Cartesian coordinates). At
the end of this paper, we raise the question that has been neglected thus far: “What does the Riemann sphere’s axis stand for?” We show that the answer can be obtained only by observing from the inside the sphere by setting the viewpoint of the immersive environment on the point (0, 0), which is always undefined in projective geometry.

Time-Tubes: Visual fusion and validation for ameliorating uncertainties of blazar datasets from different observatories

SAWADA Naoko, NAKAYAMA Masanori, YUN Hsiang-Yun, UEMURA Makoto, FUJISHIRO Issei

CGI'17 Proceedings of the Computer Graphics International Conference (ACM ICPS) 14-1 - 14-6 2017.06

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

Astronomers have been observing blazars to solve the mystery of the relativistic jet. A technique called TimeTubes uses a 3D volumetric tube to visualize the time-dependent multivariate observed datasets and allows astronomers to interactively analyze the dynamic behavior of and relationship among those variables. However, the observed datasets themselves exhibit uncertainty due to their errors and missing periods, whereas periods interpolated by TimeTubes result in a dierent type of uncertainty. In this paper,
we present a technique for ameliorating such data- and mappinginherent
uncertainties: visual fusion of datasets for the same blazar from two different observatories. Visual data fusion with Time-Tubes enables astronomers to validate the datasets in a meticulous manner. This is a short paper presented at CGI2017, held at Keio University Hiyoshi Campus, Yokohama, Japan, June 27-30 (presentation day: June 28), 2017.

Access to Document (DOI)

音源に同期する運指に注目した吹奏アニメーションの自動生成

堀井絵里, 藤代一成

Visual Computing/グラフィクスとCAＤ合同シンポジウム2017 (画像電子学会・情報処理学会・映像情報メディア学会) 41:1 - 41:4 2017.06

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

本研究では，管楽器を演奏するキャラクタの吹奏アニメーションを，音楽に容易に同期させるため，音源から自動的に運指のアニメーションを生成することを目指す．より具体的には，ウインドシンセサイザを用いて作成したMIDI 音源を解析することにより，吹奏の情報を得る．得られた情報をキャラクタの指や腕，および管楽器のピストンやスライドに適用することにより，運指が音源に同期した，自然な吹奏アニメーションを実現する．ポスタNo.41として発表．

異方性をもつ紙繊維シートの破断シミュレーション

篠崎紗衣子, 中山雅紀, 藤代一成

Visual Computing/グラフィクスとCAＤ合同シンポジウム2017 (画像電子学会・情報処理学会・映像情報メディア学会) 33:1 - 33:4 2017.06

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

本発表では，2 次元平面上に縦横の方向性をもたせた繊維を配置し，繊維同士をつなげて繊維のシート（紙繊維シート）を生成する．さらにシートにはシートを充填する填料，繊維の回転に反発するヒンジばねのモデルを組み込み，シートに力が加えられたときこれらに発生する力学的な作用を考慮して破断のシミュレーションを行う．ポスタNo.33として発表．

器官の準解剖学的データを用いた手のモデリング

中田聖人, 藤代一成

Visual Computing/グラフィクスとCAＤ合同シンポジウム2017 (画像電子学会・情報処理学会・映像情報メディア学会) 28:1 - 28:4 2017.06

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

本発表では，骨格の解剖学的なデータと，腱，筋肉，皮膚，血管の人工的なデータを用いて，各器官の形状をスカラ関数として表現し，組み合わせる．このようにしてモデリングされた手の準解剖学的なモデルを動かし，スカラ関数を変化させることで，内部構造の動きによる手の表面の変化を陰的にモデリングできる手法を提案する．ポスタNo.28として発表．

Visual analysis approach for the process of sound processing by composers in Spectral School

TAKAKURA Yuriko, NAKAYAMA Masanori, KOJIMA Yuriko, FUJISHIRO Issei

IPSJ SIG Report (Information Processing Society of Japan) 2017-MUS-115 ( 36 ) 1 - 6 2017.06

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

Making many-to-many parallel coordinate plots scalable by asymmetric biclustering

YUN Hsiang-Yun, NIIBE Yusuke, WATANABE Kazuho, TAKAHASHI Shigeo, UEMURA Makoto, FUJISHIRO Issei

Proceedings of IEEE PacificVis 2017 (IEEE Computer Society) 305 - 309 2017.04

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

Datasets obtained through recently advanced measurement techniques tend to possess a large number of dimensions. This leads to explosively increasing computation costs for analyzing such datasets, thus making formulation and verification of scientific hypotheses very difficult. Therefore, an efficient approach to identifying feature subspaces of target datasets, that is, the subspaces of dimension variables or subsets of the data samples, is required to describe the essence hidden in the original dataset. This paper proposes a visual data mining framework for supporting semiautomatic data analysis that builds upon asymmetric biclustering to explore highly correlated feature subspaces. For this purpose, a variant of parallel coordinate plots, many-to-many parallel coordinate plots, is extended to visually assist appropriate selections of feature subspaces as well as to avoid intrinsic visual clutter. In this framework, biclustering is applied to dimension variables and data samples of the dataset simultaneously and asymmetrically. A set of variable axes are projected to a single composite axis while data samples between two consecutive variable axes are bundled using polygonal strips. This makes the visualization method scalable and enables it to play a key role in the framework. The effectiveness of the proposed framework has been empirically proven, and it is remarkably useful for many-to-many parallel coordinate plots.

Time-Tubes: Visual fusion for ameliorating uncertainty of blazar datasets from different observatories

SAWADA Naoko, NAKAYAMA Masanori, YUN Hsiang-Yun, UEMURA Makoto, FUJISHIRO Issei

Proceedings of IEEE PacificVis 2017 (IEEE Computer Society) 336 - 337 2017.04

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, whereas it is difficult to analyze the time-dependent multivariate datasets with the conventional visualization methods, such as animeted scatterplot matrices. In our previous study, a new visualization scheme, called TimeTubes, was proposed, which allows the astronomers to analyze dynamic changes in and feature causality among the multiple time-varying variables. In this poster, we present a core idea to ameliorate data-inherent and mapping-inherent uncertainty through visual fusion of datasets for the same blazar from two different observatories.

Selection of localized audio track based on eye-tracking technologies with application to musical art gallery

SHIMIZU Fumiya, 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

Many methods using eye tracking have been proposed for realizing interfaces for everyday device including digital signage and HMD. Such visual interfaces have a potential to be utilized as audio interface. We herein intend to allow the viewer to select the audio data by detecting his/her gaze with a single webcam. As a result, we will be able to provide the viewer with an immersive environment where he/she can focus on the object easily. Also, we present a preliminary design of the interface with motivation for application to a museum or an art gallery.

A visual analysis system for compositional processes of spectral school

TAKAKURA Yuriko, NAKAYAMA Masanori, 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

We propose a visual analysis approach to explore the compositional process of composers in Spectral School, with a particular focus on the sub-processes of sound analysis and synthesis. Spectral music is one of the significant trends in contemporary music since the 1970s. Composers in Spectral School use the acoustic properties of sound spectra as the basis of their compositional materials. One of the representative software systems they use is AudioSculpt, which has been developed by IRCAM. We have developed an accompanying system with AudioSculpt to represent the history of creating sounds with spectral analysis of sound materials and processing of sound spectra using the various filters. The salient feature of the system lies in its stacked spectrogram space whose axes represent the elapsed time of the sound and the progress of composition. On the pixeloriented spatial substrate, the system makes it possible for users to analyze the compositional processes by dedicated interactive manipulations. As such, the users are allowed to examine the compositional processes of musical pieces, whereas primary targets of most previous studies were only completed pieces. The present system can also be regarded as an initial attempt at managing the provenance of timeseries events in music visualization field. Our approach is intended to open a door for the composers to develop and share the compositional methodologies.

2D fluid shape design by direct manipulation

HAYAKAWA Yuta, 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

Human-body modeling and position specification for forensic autopsy data visualization

MANO Junki, TOYOURA, MAO Xiaoyang, SHOJO Hideki, ADACHI, 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

This paper proposes the methods for creating a human-body model that reflects individual victim characteristics and obtaining position information on the human-body model for the purpose of forensic autopsy data visualization. Although modern imaging technologies, such as CT and MRI, make it possible to obtain fine volumetric human-body model, these technologies are still not widely used in the real forensic autopsy sites due to the cost. To enable a forensic specialist to easily create 3D models of victims, we propose a new method which uses an affordable depth-sensing camera and requires few user interactions. To visualize the autopsy data directly on a 3D model, we also propose a method for specifying a position on the 3D model without impeding the progress of the autopsy procedure.

Effects of non-contact interaction on digital signage advertisement

NAGAO Ken, FUJISHIRO Issei, TAKAHASHI Ikuo

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

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

Nowadays a variety of interaction technologies have been developed and some of them allow a user to interact in non-contact ways such as through body gestures. Such non-contact interactions become to be utilized for wide purposes, including communication with digital signage, which is one of the new types of media and often used as advertisements in public. However, current utilization of non-contact interactions for digital signage advertisements lacks consideration of its effects from the aspect of consumer behaviors. In this paper, we study the effects of non-contact interactions on digital signage advertisements through hypothesis testing in the light of consumer behaviors. Our results suggest the pros and cons of non-contact interactions for digital signage advertisements. We discuss how we can capitalize the strengths of non-contact interactions for digital signage advertisement.

Multisensory realization using topology-accentuated visualization

TAKESHIMA Yuriko, 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

Computer visualization is widely used to analyze various phenomena in many areas. It is useful to explore the target dataset which has a few physical fields, but it is hard to understand multiple fields simultaneously. Especially, in
flow fields, since most datasets have vector field and its associated multiple scalar fields, we are faced with the above problem as long as we rely only on visualization. In this
paper, we focus on a multisensory realization method that combines haptization with visualization for the analysis of flow fields. We propose the use of adaptive visual transfer
functions which are based on the topological structure of a target scalar field. Haptic transfer functions, which produce three-dimensional forces, are designed to analyze the vector
field in a haptic manner. We evaluate the effectiveness of our method using a time-varying three-dimensionalwake turbulence dataset.

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．

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