著者

寺本 渉 吉田 和博 日高 聡太 浅井 暢子 行場 次朗 坂本 修一 岩谷 幸雄 鈴木 陽一

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.15, no.3, pp.483-486, 2010

被引用文献数

8

---

For virtual reality systems, the enhancement of a sense of presence (a subjective experience of being in one place even when one is physically situated in another) has been the most important issue. Both theoretically and empirically, the sense of presence has been found to relate dominantly to background components contained in a scene. In contrast, the reality or virtuality which can be assumed to link essentially to foreground components in a scene has not been investigated in detail. The present study defined the latter type of sense as vraisemblance (verisimilitude), and made an exploratory investigation into spatio-temporal characteristics responsible for the higher vraisemblance by using a scene containing Shishi-odoshi (a traditional Japanese fountain made of bamboos) in a Japanese garden as audio-visual stimuli. In Experiment 1, the effects of the field size of view and the sound pressure level of the background were investigated. Higher vraisemblance was observed with the middle field size of view with the original sound pressure level of the background, whereas higher sense of presence was observed with the larger field size of view with the larger background sound. In Experiment 2, the effect of temporal asynchrony between the foreground audio-visual stimuli produced by Shishi-odoshi was investigated. The results show that the range of temporal-window for the audio-visual stimuli necessary for high vraisemblance was different from those for high presence. These findings suggest that the sense of vraisemblance can be distinguishable from the sense of presence, and deeply involved to the foreground-based aesthetic impression in a scene.

著者

有賀 玲子 前田 篤彦 小林 稔

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.17, no.2, pp.119-128, 2012

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Consumers are very keen to communicate with a richer set of media and 3D shape is a very intuitive and powerful means of communication. Recently, users and developers have become more interested in capturing, in 3D, things that currently exist. New services will emerge if consumers can access 3D capture devices that are low cost and low effort. Existing 3D scanners take too long and are difficult to set up. We propose a box type capture device with which anyone can rapidly capture whole surfaces of target objects without any complicated operations. This paper proposes the three basic technologies of the capture device and demonstrates their feasibilities.

著者

野嶋 琢也 梶本 裕之

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.13, no.2, pp.217-225, 2008

参考文献数

16

被引用文献数

2

---

The head up display (HUD) is becoming increasingly common in the aerospace field because it has many benefits such as enabling operations in poor visibility and improving flight safety. The HUD is a kind of augmented reality display that enables a pilot to observe the scene outside the cockpit while simultaneously viewing an artificial image of flight information. However, the HUD is too expensive and heavy for light airplanes. In this paper, we propose a new method to compose a simple HUD using Retro-reflective Projection Technology and a propeller. In this report, we also describe the developed system and preliminary experimental results.

著者

木島 竜吾 山田 英治郎 小鹿 丈夫

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.6, no.2, pp.107-114, 2001

参考文献数

15

被引用文献数

7

---

Time lag between the human motion and display output is a large obstacle that prevent the Head Coupled Display from application. A novel HMD "Reflex HMD", with time lag compensation was proposed and the preliminary prototype was constructed. The angular movement is measured by gyroscope in this HMD, modulates the driving signal for LCD panel, and shifts the viewport within the image supplied from the computer. The merit of this system is 1) the independece of computer platform, operating system, and application, 2) low cost and light weight, 3) precise compensation without causing additional delay. An experiment with the prototype ReflexHMD successfully showed that the delay of about 100 milliseconds (six frames) was decreased within one frame.

著者

井村 誠孝 小塚 淳 南 広一 田畑 慶人 守随 辰也 千原 國宏

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.7, no.4, pp.481-486, 2002

被引用文献数

1

---

A horseback archery (called Yabusame in Japanese) is the traditional art of Japan that dates from the Heian Era (10th century). Since a horseback archery requires both horse riding skill and archery skill simultaneously, ordinary people cannot experience this excitement during their lifetimes. The authors extract essential elements from a horseback archery and reconstruct them in more simple style utilizing fusion of various sensors and movable L-shape immersive screens. The developed system enables ordinary people to enjoy the excitement of a horseback archery. Moreover, the authors import competition between two players into the traditional style of horseback archery so as to improve quality as entertainment.

著者

鈴木 康広 檜山 敦 廣瀬 通孝

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.12, no.3, pp.397-400, 2007

被引用文献数

1

---

This paper describes the development of the display that controls the light and shadow cast on the floor using illumination lamp or natural sunlight as a light source. Polymer Dispersed Liquid Crystals (PDLC) film that can switch from opaque to transparent rapidly is used in each pixel of the display. The display is intended to install in ceiling or window and artificially generates images of shadow on the ground or wall just like sunshine filtering through foliage. Our concept is to develop the display that can appeal to person's instinct as an interactive art installation.

著者

森 博志 白鳥 和人 星野 准一

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.15, no.3, pp.369-378, 2010

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We propose a wellness entertainment system using trampoline interface. In this system, we use a mini trampoline as the input device. The system enables the user to move and jump freely in VR space by exaggerated movement corresponding to walking or jumping on the mini trampoline. Improvements in exercise motivation and support for continuous exercise are achieved in our system, since it is possible to enjoy strolling through a virtual space, which is usually difficult to experience, by exercising on the mini trampoline without injury to the user's joints

著者

吉井 暢彦 和田 隆広 塚本 一義 田中 聡

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.9, no.4, pp.397-404, 2004

被引用文献数

5

---

Appropriate exercises are important to maintain the health. In this paper, we develop the virtual reality snowboard system for whole body exercise and rehabilitation. Users can continue exercises pleasantly since the virtual reality snowboard system has amusement. In addition, we propose a methodology to provide the appropriate exercise corresponding to the personal condition by using the proposed virtual snowboard system. In the training, the longitudinal and lateral distances of sets of the flags and torque exerted on the board are controlled based on the user's conditions. Finally, we will show the effectiveness of our proposed method by measuring the heart rates, oxygen uptake and EMG signal of upper and lower limbs. It is shown that the exercise strength is enough for the training and the strength can be controlled by changing the positions of flags and torque by measuring the heart rates, oxygen uptake and EMG signals of upper and lower limbs while playing snowboard.

著者

薄 充孝 中川 知香 佐藤 智和 横矢 直和

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.13, no.2, pp.161-170, 2008

被引用文献数

15

---

In this paper, we propose a novel method that estimates camera position and posture from a single image using a feature landmark database. Conventionally, several kinds of camera parameter estimation methods are proposed in which pre-constructed database is used to estimate the camera parameters. In the most of these methods, they achieve fast and high accurate estimation by limiting searching range for the database using the assumption that camera motion for successive image frames is small. However, if the input is a single image, these approaches do not work because there is no good initial parameter to limit the searching range for the database. In this research, we gradually limits the searching range for the landmark database by using GPS position, SIFT distance, and consistency of camera position and posture. The validity of the proposed method has been shown through experiments for an outdoor environment.

著者

佐々木 健 小泉 輝 岡崎 俊郎 森岡 崇 井東 道昌 宮武 秀樹 森 密雄 鈴木 隆司

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.16, no.3, pp.435-439, 2011

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Control issues on haptic device control for virtual prototyping of power window switches are presented. A one degree-of-freedom haptic device was designed to display a virtual switch. The difference in the mass of a real switch and that of the haptic device was the main cause of the difference in the operational feeling. Dynamic equivalent mass was reduced by assisting the operational force. Hysteresis was also incorporated in the force-stroke curve. Sensory evaluation has verified that these control methods have enhanced the reality of the operational feelings of the virtual switch.

著者

澤田 枝里香 井田 信也 常磐 拓司 杉本 麻樹 稲見 昌彦 淡路 達人 森下 圭介 古川 正紘 有賀 友恒 木村 秀俊 藤井 智子 武市 隆太 清水 紀芳

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.13, no.3, pp.375-383, 2008

参考文献数

21

被引用文献数

3

---

This system is an interface realized with the symbiosis of the input/output of wind and graphics. This system brings the new communication medium of "wind" into the bidirectional interaction between the virtual environment and the real environment by integrating the graphic presentation with the input and output of wind on a special screen. The user can interact with the virtual environment in the screen through his/her breath and wind emission. Conversely, actions from the virtual environment to the user are performed by wind changing dynamically. As a result, the user can share not only sights and sounds but also the cutaneous sensation by wind with the system, and interact with the virtual environment feeling a non-conventional deep relationship.

著者

小竹 大輔 佐藤 清秀 内山 晋二 山本 裕之

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.13, no.2, pp.183-193, 2008

被引用文献数

2

---

We propose a hybrid camera pose estimation method using an inclination sensor and line segments. While our method does not require any prior information on the camera pose and the correspondences between 2D and 3D line segments, it can calculate the camera pose fast using the two-step algorithm that calculates azimuth first and then position under the inclination constraint obtained from the sensor. These features meet the requirement of initialization for edge-based registration used in mixed reality (MR) systems. This paper describes the details of the method and shows its effectiveness with experiments in which the method is used in an actual MR application.

著者

橋本 渉 吉田 恭平

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.10, no.2, pp.183-189, 2005

被引用文献数

11

---

Immersive display is the device that can provide an immersive viewing experience by surrounding around user. The typical problem of the display is that the device occupies huge space and it is hard to move the whole environment. This paper proposes an transportable immersive display. Our environment uses existing walls as screen. In order to avoid the focus problem when the projector image displays on non-planer surface, we utilizes a convex mirror to increase the length of the projector's focal depth. In addition, the mirror helps the projecter's image to spread the wide area. This paper also reports the distortion correction method of the projected image on the various shapes of the wall.

著者

安藤 英由樹 渡邊 淳司 雨宮 智浩 前田 太郎

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.10, no.4, pp.505-512, 2005

被引用文献数

1

---

In recently proposed saccade-based information displays, the observer cannot see an afterimage without moving the eyes appropriately and therefore often cannot see the afterimage correctly. We propose a new display system based on a concise saccade detection technique and the perceptual features of eye movement. In addition, with a system consisting of a wearable sensor (saccade detector) and a ubiquitous display (saccade-based display), we propose an application where many viewers can be accommodated simultaneously (Several viewers can view an image simultaneously (timesharing) with one saccade-based display.) and independently (Several viewers can view different images with one saccade-based display.). In experiments, we compared character-recognition rates to confirm that the detection of the saccade improves the visibility of the saccade-based display. The results indicate that the recognition rate is clearly improved.

著者

草地 映介 渡邊 淳司

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.12, no.3, pp.389-392, 2007

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To draw pictures is creative activity, and one of effective method of self-expression. Generally speaking, however, as people get older, the opportunities to draw pictures decrease and people become not to enjoy drawing in the daily life. Therefore, our project aims to bring drawing, which is essentially enjoyable and makes the life creative, closer to the public people. In this paper, the authors propose "Minimal Drawing", which can solve the problems mentioned above. In order to achieve minimal drawing experience, the authors developed a drawing environment, called as "Roll Canvas". It has the circulated canvas. The user can control the rotation of the canvas, and he/she can draw any kind of pictures freely when the canvas is rotating. Unexpected line drawing can be generated due to the contingency between user's drawing action and the rotation of the canvas. The drawing sometimes can be an artistic picture or a textile design. In this way, the minimal drawing experience includes both user's intension and accidental strokes, which can open up further possibility of drawing to the wide range of people.

著者

林 建一 加藤 博一 西田 正吾

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.12, no.2, pp.149-158, 2007

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Many kinds of tracking for Augmented Reality had been proposed. In case of the feature point tracking, the pose is computed by minimizing the error between the observed 2D feature points and the back-projected feature points from the 3D scene model. This minimization problem is usually solved by a non-linear optimization. The main advantage of this approach is its accuracy. However, it is difficult to compute the correct pose unless an appropriate initial value is used. In addition, when some errors are included in the observation, this approach does not guarantee the correct pose even if it converged on the global minimum. So, once an incorrect pose was computed in one frame, tracking may fail in the next frame or the result will get farther from the correct one. In this paper, we propose a new tracking framework for augmented reality. Proposed method tracks features as multiple local hypotheses based on not only one pose but also multiple poses that are computed in the pose estimation in the previous frame. Since multiple poses are maintained as global hypotheses, as far as the correct pose is contained in the hypotheses, the tracking can be continued in even hard situations like a simple iterative scene with high-speed movement.

著者

神原 誠之 横矢 直和 竹村 治雄

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.7, no.3, pp.367-373, 2002

被引用文献数

3

---

This paper describes a method to extend the registration range ofa visionbased augmented reality (AR) system. We propose to use natural feature points contained in images captured by a pair of stereo cameras in conjunction with pre-defined fixed fiducial markers. The system also incorporates an inertial sensor to achieve a robust registration method which can handle user's fast head rotation and movement. The system first uses pre-defined fiducial markers to estimate a projection matrix between real and virtual world coordinate systems. At the same time, the system picks up and tracks a set of natural feature points from the initial image. As a user moves around in an AR environment, the initial markers fall out from the camera frame and natural features are then used to recover the projection matrix. Experiments for evaluating the feasibility of the proposed method are carried out and show the potential benefits of the method.

著者

遠藤 守 安田 孝美 横井 茂樹

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.5, no.2, pp.823-830, 2000

被引用文献数

10

---

Recently, the demand for 3-dimensional humanoid animation on the Internet has increased. We have developed an animation system to generate human actions based on a hierarchic human body description and action library. Using this system, 3D human body structure and behavior can be managed in a unified way and can be used with VRML. We were able to describe a human structure model and action information as well as develop methods to generate action animation utilizing libraries in the internet. This paper explains the concept and the structure of the system and its application on the Internet.