Details of a Researcher - Fujishiro, Issei

Papers - Fujishiro, Issei

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aflak: Pluggable visual programming environment with quick feedback loop tuned for multi-spectral astrophysical observations

Boussejra M., Matsubayashi K., Takeshima Y., Takekawa S., Uchiki R., Uemura M., Fujishiro I.

Proceedings of IEEE VIS 2018 (IEEE Computer Society Press) 72 - 76 2018.10

Research paper (international conference proceedings), Joint Work, Last author, Corresponding author, Accepted

With the improvements of telescopes and proliferation of sky surveys, there is always more astrophysical data to analyze, but not so many astronomers. We present aflak, a visualization environment to analyze astronomical datasets. This paper’s contribution lies in that we leverage visual programming techniques to conduct fine-grained astronomical transformations, filtering and visual analyses on multispectral datasets, with the possibility for astronomers to interactively fine-tune all the interacting parameters. As the visual program is gradually designed, the computed results can be visualized in real time, thus aflak puts the astronomer in the loop, while managing data provenance at the same time.

Access to Document (DOI)

A figurative and non-topological approach to mathematical visualization

MIYAZAWA Atsushi, NAKAYAMA Masanori, FUJISHIRO Issei

Proceedings of Cyberworlds 2018 (IEEE CPS) 150 - 155 2018.10

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

The term figurative refers to any form of mathematical visualization that retains strong references to the geometry found in the real world. This paper explains the figuration process for some basic mathematical functions definable in the n-dimensional complex projective space. In the latter part of this paper, we raise a 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 to the origin, which is always undefined in projective geometry. We also draw some basic math functions that are familiar to us on the projective plane and observe the invariant properties that exist among the functions, which were thought to be different from one another.

Access to Document (DOI)

Adaptive reconfiguration of large display content geometry and layout based on passengers’ position

NAGAO Ken, Ma Kwan-Liu, FujishiroFUJISHIRO Issei

Proceedings of IEEE RTCSA 2018 Workshop on Smart City Based on Artificial Intelligence (SCAI 2018) (IEEE) S1-4:1 - S1-4:5 2018.08

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

A viewer is likely to see the large display content with a distorted geometry which differs in accordance with his individual standing position. This problem makes it difficult for the viewer to understand the large display content correctly. In particular, when such a large display is used as digital signage advertisement, this problem has negative influences on its advertising effect. On top of that, in most cases, passengers do not originally have interests in the digital signage content, and thus it is not proper to ask them to move to appropriate positions, though this is suggested in previous studies. We, therefore,
propose a novel method which can deliver the content only with little distortion to each passenger without requiring voluntary moves and times. Specifically, the method automatically detects each passenger’s position and adaptively reconfigures the large display content geometry and layout as if the content were rotated toward the positions. We implemented a large display system with the proposed method and evaluated the effectiveness of our method.

TimeTubes: Visual exploration of observed blazar datasets

FUJISHIRO Issei，SAWADA Naoko, NAKAYAMA Masanori, WU Hsiang-Yun, WATANABE Kazuho, TAKAHASHI Shigeo, UEMURA Makoto

Journal of Physics: Conference Series (IOP Press) 1036 ( 1 ) 012011:1 - 012011:13 2018.06

Research paper (international conference proceedings), Joint Work, Lead author, Corresponding author, Accepted, ISSN 17426588

Blazars are attractive objects for astronomers to observe in order to burrow into the magnetic field in the relativistic jet. This paper presents TimeTubes as a novel visualization scheme that allows astronomers to interactively explore characteristic temporal variation patterns in observed blazar datasets. In the TimeTubes spatialization, the two Stokes parameters and their errors with a common timestamp are transformed into an ellipse. A series of such ellipses are aligned in parallel along the timeline to form a 3D volumetric tube. The resulting tube is then colorized by the observed intensities and colors of the blazar, and finally volume-rendered. A designated user interface is provided with visual exploration functions according to Shneiderman's Visual Information Seeking Mantra. In the latest version, an auxiliary mechanism, called visual data fusion, was incorporated to ameliorate data- and mapping-inherent uncertainties for more efficient and effective visual exploration.

Access to Document (DOI)

Duality

Masanori Nakayama, Issei Fujishiro

Asian Digital Modeling Contest 2017 Catalogue (Japan Society for Graphic Science) 8 - 11 2017.08

Research paper (other academic), Joint Work, Last author, Corresponding author, Accepted

In the present work, we attempted at expressing human "two-facedness" by the "two-sidedness" of the 3D structures. In the field of geometry, there exists a two-facedness called “duality,” which represents the relationship between diagrams that switch between faces (cells) and vertices. Delaunay diagram and Voronoi diagram give a typical example. We have developed an algorithm to generate a Poisson-disk distribution in an arbitrary shape to make sculptures with those diagrams. The Delaunay diagram generated by Poissondisk distribution point cloud makes up the uniform tetrahedral mesh (except for the surface). Since those cells are close to a regular tetrahedron, Voronoi vertices located on the circumcenters also have an almost uniform distribution.

Visual simulation of whirlwind using a grid and particles

NAKAJIMA Satoshi, FUJISHIRO Issei

Proceedings of NICOGRAPH International 2012 (The Society for Art and Science) 27 - 34 2012.07

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

In this paper, we present an interactive approach to visual simulation of whirlwind using a grid and particles. High-resolution simulation can be carried out efficiently by perturbing air flow computed on a rough grid with small-scale turbulence. The grid-based simulation first provides a primary whirlwind flow field through modeling its underlying heat convection. Then, the particle-based simulation computes the transport energy of turbulence based on a two-equation k-ipsilon model, which allows us to capture the turbulence details. The dynamism of whirlwind is conveyed effectively by the interaction with rigid and deformable bodies, such as flag, branch and paper, placed on interactively-controllable trajectories. In addition, a simplified variant of particle-based volume rendering is utilized to delineate changes in the translucency of whirlwind, which reflects the amount of sand particles stirred up from the ground.

Visual simulation of bleeding on skin surfaces taking physisorption and congelation into primary account

UEDA Kazuhide, FUJISHIRO Issei

Proceedings of Computer Graphics International 2012 (Computer Graphics Society) 2012.06

Research paper (international conference proceedings), Joint Work, Last author, Corresponding author, Accepted

The liquid dynamics has a significant impact on video works, and bleeding is no exception. Hemorrhage scenes possess highly-important implications, as seen from the fact that they might make the work rated age limit. Lack of visual reality in those scenes would reduce the overall quality of the work. Against this background, we have built upon a commonly-used Lagrangian method, called SPH (Smoothed Particle Hydrodynamics), to simulate bleeding on skin surfaces more faithfully. Remarkable features of the extension are three-fold: (1) bleeding from a wound modeled along with in-vivo blood flow, which takes account of the wound’s shape, hemorrhage volume, and bleed momentum; (2) physisorption of blood on the skin surfaces formulated by introducing an additional adsorption term, analogous to van der Waals force, to the original Navier-Stokes equations and by allowing for saturation of adsorption media; and (3) congelation of blood represented by varying viscosity according to the time exposed to the air.

Feature-driven volume fairing

TAKAHASHI Shigeo, KOBAYASHI Jun, FUJISHIRO Issei

Tenth International Symposium on Smart Graphics (Lecture Notes in Computer Science) (Springer-Verlag, Berlin/Heidelberg/New York) 5531 233 - 242 2009.05

Research paper (conference, symposium, etc.), Joint Work, Accepted, ISSN 0302-9743

Volume datasets have been a primary representation for scientific visualization with the advent of rendering algorithms such as marching cubes and ray casting. Nonetheless, illuminating the underlying spatial structures still requires careful adjustment of visualization parameters each time when a different dataset is provided. This paper introduces a new framework, called feature-driven volume fairing, which transforms any 3D scalar field into a canonical form to be used as communication media of scientific volume data. The transformation is accomplished by first modulating the topological structure of the volume so that the associated isosurfaces never incur internal voids, and then geometrically elongating the significant feature regions over the range of scalar field values. This framework allows us to elucidate spatial structures in the volume instantly using a predefined set of visualization parameters, and further enables data compression of the volume with a smaller number of quantization levels for efficient data transmission.

Designing 6DOF haptic transfer functions for effective exploration of 3D diffusion tensor fields

OGAWA Yuta, FUJISHIRO Issei, SUZUKI Yasuko, TAKESHIMA Yuriko

Proceedings of World Haptics 2009 (IEEE Robotics and Automation Society) 470 - 475 2009.03

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

Rapid dissemination of DT-MRI devices has recently evoked
intensive research to come up with effective methods for
grasping the structural features of acquired 3D diffusion tensor fields. In this paper, we further explore the potential of haptization in conjunction with visualization to represent different levels of information on the DT-MRI datasets. The main contribution of this paper is to propose a sophisticated method for utilizing diffusion-based tractography textures mapped on cross-sections to visualize local structures such as nerve tracts, together with appropriate 6DOF haptic transfer functions to haptize elementary diffusion properties. We illustrate the effectiveness of a prototype system featuring a PHANToM Premium 3.0 with an application to a practical DT-MRI human brain dataset.

Music learning through visualization

HIRAGA Rumi,WATANABE Fumiko,FUJISHIRO Issei

Proceedings of Second International Conference on Web Delivering of Music (WEDELMUSIC2002) (IEEE Computer Society Press) 101 - 108 2002.12

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

Hardware-accelerated selective LIC volume rendering

SUZUKI Yasuko,FUJISHIRO Issei,Li Chen,NAKAMURA Hiroko

Proceedings of IEEE Visualization 2002 485 - 488 2002.10

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

Comprehensible volume LIC rendering based on 3D signiﬁcance map

Li Chen,FUJISHIRO Issei,SUZUKI Yasuko

Proceedings of SPIE Conference on Visualization and Data Analysis 2002 142 - 153 2002.01

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

GADGET/IV: A taxonomic approach to semi-automatic design of information visualization applications using modular visualization environment

FUJISHIRO Issei,FURUHATA Rika,ICHIKAWA Yoshihiko,TAKESHIMA Yuriko

Proceedings of IEEE Symposium on Information Visualization 2000 77 - 83 2000.10

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

Parallel visualization of gigabyte datasets in GeoFEM

FUJISHIRO Issei,TAKESHIMA Yuriko,Li Chen,NAKAMURA Hiroko,SUZUKI Yasuko

Proceedings of Second APEC Cooperation for Earthquake Simulation (ACES) Workshop M. Matsu’ura 557 - 562 2000.10

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

Solid ﬁtting: Field interval analysis for eﬀective volume exploration

FUJISHIRO Issei,TAKESHIMA Yuriko

Proceedings of Dagstuhl’97 Scientiﬁc Visualization (IEEE Computer Society Press) 65 - 78 2000

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

Automating transfer function design for comprehensible volume rendering based on 3D ﬁeld topology analysis

FUJISHIRO Issei,AZUMA Taeko,TAKESHIMA Yuriko

Proceedings of IEEE Visualization ’99 467 - 470 1999.10

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

GADGET: Goaloriented application design guidance for modular visualization environments

FUJISHIRO Issei,TAKESHIMA Yuriko,ICHIKAWA Yoshihiko,NAKAMURA Kyoko

Proceedings of IEEE Visualization’97 245 - 252 1997.10

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

Human behavior-oriented adaptive texture mapping: A time-critical approach for image-based virtual showrooms

FUJISHIRO Issei,TANAKA Rika,MARUYAMA Tomoko

Proceedings of IEEE Virtual Reality Annual International Symposium(VRAIS) ’97 4 - 11 1997.03

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

Interval volume: A solid ﬁtting technique for volumetric data display and analysis

FUJISHIRO Issei,MAEDA Yuji,SATO Hiroshi

Proceedings of IEEE Visualization’95 151 - 158 1995.10

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

ボリュームシームカービング: Gaussian Splattingで再構成された3Dシーンの濃縮

松本悠弥，藤代一成

NICOGRAPH 2025プロシーディング (芸術科学会) F09-1 - F09-8 2025.12

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

XR技術の発展に伴い，撮影動画からの三次元(3D)シーン再構成に対する需要が高まってきている．Neural Radiance Fieldsの登場を皮切りに，3D再構成に関する研究は急速な発展を遂げ，スマートフォンでも簡単に3D再構成ができる環境となりつつある．その一方で，シーンや特定のオブジェクトに対する編集は難しく，未だ途上段階である．そこで本研究は，Gaussian Splattingにより再構成された3Dシーンの自動的な編集を目指す．特に本論文では，シーンの前景部分を濃縮するボリュームシームカービングの手法を提案する．提案手法では，3D Gaussianシーンをボクセルグリッドに変換し，マルチパス動的計画法によるエネルギ最小化に基づくシーム面抽出を繰り返し適用することで，各ガウシアンの幾何的・外観的特徴および空間的一貫性を反映しながら，不要な前景領域を削除し，シーンを濃縮する．異なるシーンに適用し，シーン全体の主要な外観的特徴を維持した前景濃縮の実現性を示すことで，本手法が再構成3Dシーンの自動編集に向けた実用的アプローチであることを実証する．フルペーパー．松本は学生奨励賞受賞．

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