著者
青砥 宏治 倉重 光宏
出版者
一般社団法人映像情報メディア学会
雑誌
映像情報メディア学会誌 : 映像情報メディア (ISSN:13426907)
巻号頁・発行日
vol.62, no.6, pp.943-949, 2008-06-01
被引用文献数
3 1 1

This paper analyzes success factors from the view point of entrepreneur engineering accomplished by the Hi-Vision plasma display panel (PDP) R&D consortium (abbreviated as the PDP R&D Consortium. 1994-1999) that was established as a conglomerate like association targeting the creation of new technologies. We clarified through assessing outcomes that the optimal timing and the synergy effect between establishing hardware (PDP TVs) and software (Hi-vision programs) in cooperation with the acceleration of Hi-vision diffusion were key factors, which are typically effective in overcoming the death valley laid between a seeds innovation to a needs innovation (stasis between when innovation is introduced and when it delivers yields). Non-linear concurrent and matrix management was also an effective innovative administrative style.
著者
中西 昭雄
出版者
一般社団法人映像情報メディア学会
雑誌
映像情報メディア学会誌 : 映像情報メディア (ISSN:13426907)
巻号頁・発行日
vol.61, no.7, pp.935-940, 2007-07-01

写真はカメラにフィルムを装填して撮るという時代が長く続いたが,ディジタル化の風が吹いてきたと思ったら,あっという間にディジタルスチルカメラがカメラシェアの大半をとるようになってしまった.ディジタルスチルカメラは確かに便利だが,その特性上苦手とする対象もある.天体をはじめとする微弱光の撮影は,露出時間が数十秒から数十分と長くかかるため,撮像センサの暗電流が露出時間を制限してしまうためである.しかし撮像センサやノイズ除去技術の向上により,この欠点が克服されてきている.

1 0 0 0 可視光通信

著者
中川 正雄
出版者
一般社団法人映像情報メディア学会
雑誌
映像情報メディア学会誌 : 映像情報メディア (ISSN:13426907)
巻号頁・発行日
vol.60, no.12, pp.1908-1913, 2006-12-01
被引用文献数
6 8

いつでもどこでも情報を受け取ることのできる無線通信の普及にはすごいものがある.電波,特に波長が10cm程度以上の波は,ビルの谷間でも,室内でも,どこからともなく入り込み,いつでもどこでも情報を交換するという我々の要求を満たしてくれる.こうしたモバイル技術の次に来るものとして,ユビキタス技術が期待されている.これはあらゆる物が情報を発する技術であり,物の管理のためだけでなく,街やオフィスなどを,人間にとって便利に,安全に,楽しくするための技術である.こうしたことを可能にする可視光通信技術について述べていく.見える光は電波と同じ波の一種なので,当然ながら,情報を伝えることができる.可視光通信の可能性をユビキタスなインフラとしてのメリットや社会的メリットから探っていく.
著者
寺井 康浩 荒井 俊明 諸沢 成浩 徳永 和彦 福本 絵理 木下 智豊 藤森 隆成 笹岡 龍哉
出版者
The Institute of Image Information and Television Engineers
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.66, no.10, pp.J339-J345, 2012
被引用文献数
1

We developed a high mobility polycrystalline oxide semiconductor, IGO (Indium Gallium Oxide), which is the crystalline In<sub>2</sub>O<sub>3</sub> based random orientation polycrystalline material. The polycrystalline IGO has two unique characteristics. One is the high mobility with a wide window for fabrication process and the property is much stable. The other is the wet etching tolerance which enables the merged photolithography process. In spite of the low temperature process below 300°C, the mobility of polycrystalline IGO TFT was over 20cm<sup>2</sup>/Vs with the standard deviation smaller than 1cm2/Vs and the shift of the threshold voltage after positive bias temperature stress (Vg=Vd=15V, 10, 000s) was smaller than 0.3V. These results imply that the interruption of carrier conductivity at the grain boundaries of polycrystalline structure can be neglected with respect to the TFT characteristics and the reliability. From these properties, we concluded that the polycrystalline IGO is one of the promising channel materials for the backplane TFT of future OLED displays.
著者
米元 聡 有田 大作 谷口 倫一郎
出版者
一般社団法人映像情報メディア学会
雑誌
映像情報メディア学会誌 : 映像情報メディア (ISSN:13426907)
巻号頁・発行日
vol.54, no.3, pp.409-416, 2000-03-20
被引用文献数
18 1

A realtime marker-less motion-capture system is described that can easily and seamlessly map objects in the real world into a virtual environment. In general, virtual environment applications, such as man-machine seamless interaction, require the system to estimate the motion parameters for natural objects such as human bodies in realtime. To achieve this, the developed motion-capture system achieves multiple-camera fusion and reconstructs the parameters for complete humanbody motion using real-time inverse kinematics. Implementation of this system demonstrated its ability to work in realtime and online on a pc-cluster.
著者
高村 誠之 八島 由幸
出版者
一般社団法人映像情報メディア学会
雑誌
映像情報メディア学会誌 : 映像情報メディア = The journal of the Institute of Image Information and Television Engineers (ISSN:13426907)
巻号頁・発行日
vol.57, no.7, pp.873-877, 2003-07-01
被引用文献数
4 1 2

テレビ電話・遠隔会議システムなどにおいて, 符号化の前段として映像シーケンスから高速に背景を除去する方式を開発した.ソフトウェア実装にて実時間の10倍以上の速度を実現し, 入力画像の自動コントラスト調整や自動焦点調整に対しても頑健であることを確認した.
著者
杉本 篤実
出版者
一般社団法人映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.60, no.9, pp.1379-1380, 2006

去る6月29日, ブラジリアの大統領府において, ブラジルのコスタ通信大臣と日本大使館堀村大使が覚え書きに署名し, ブラジルがISDB-Tをベースにした地上デジタル放送方式を採用することが正式に決定した.<br>ブラジルに対して行ってきた約7年にわたるISDB-T普及活動を振り返る.
著者
石橋 賢 Luz Toni Da Eynard Remy 北 直樹 姜 南 瀬木 宏 寺田 圭介 藤田 恭平 宮田 一乘
出版者
映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.66, no.1, pp.J11-J16, 2012
被引用文献数
1

In our entertainment VR application, the user can move freely through a virtual city by using a web like SpidermanTM. In this application, the user wears a web shooter, which is a device to shoot webs, and takes aim at a target building. Then, when the user swings his/her arm ahead, a web is launched and it sticks to the target building on the screen. After the web sticks to the building, the user's arm is pulled in the direction of the target building by a pulling force feedback system, which gives the feeling of pulling to the user directly and smoothly, as if he/she were attached to an elastic string. Finally, the user moves to the target building. In three exhibitions, we surveyed the effectiveness of the application by questionnaire. We were able to confirm that a lot of users had enjoyed and were satisfied with our VR application.
著者
渡邊 紀文 森 文彦 大森 隆司
出版者
一般社団法人 映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.67, no.12, pp.J434-J440, 2013 (Released:2013-11-25)
参考文献数
12
被引用文献数
2

In daily life, our behavior is guided by various visual stimuli such as the information on direction signs. However, our environmentally based perceptual capacity is often challenged in crowded circumstances, or more so, in emergency evacuation circumstances. In these situations, we often fail to pay attention to important signs. In order to achieve more effective direction guidance, we considered the use of unconscious reflexes in human walking action. In this study, we experimented with vision-guided walking direction control by optic flow stimulus combined with body sway. We observed a shift in subjects' walking direction and body sway and discuss the possible mechanism.
著者
三功 浩嗣 内藤 整
出版者
一般社団法人 映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.68, no.3, pp.J125-J134, 2014 (Released:2014-02-25)
参考文献数
12
被引用文献数
2 5

In this paper, we propose a robust object tracking scheme for multi-view cameras and consecutive frames for rendering an immersive free-viewpoint video in a large outdoor space such as a soccer stadium. For a free-viewpoint video that provides users with an immersive experience, each object has to be identified consistently among all cameras for every frame to share the textures of the same objects and replace the textures when an occlusion occurs. To satisfy this requirement, the proposed method extracts objects' silhouette regions and tracks each identified object by associating a closed silhouette region with a tracking ID for every camera. During the frame by frame process, our method confirms whether occlusion occurs for each tracking region and modifies the texture region by projecting the world coordinate of the object in 3D-space, which can be estimated from a camera image without occlusion if one is available. The experimental results revealed that the proposed method achieved more robust texture extraction of multiple objects especially for occluded regions compared to the conventional methods. Furthermore, it was confirmed that the proposed scheme can improve the subjective image quality for free-viewpoint video as a result of precise reconstruction of occluded regions.
著者
松久 ひとみ 橋本 学
出版者
一般社団法人 映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.68, no.6, pp.J252-J255, 2014 (Released:2014-05-23)
参考文献数
10
被引用文献数
3

Identifying subtle human facial expressions is important in human interactions such as human-robot communications. We propose a method to classify two types of facial expression, neutral (expressionless) and the subtle expression of happiness, using an image acquired with a camera. In the proposed method, facial shape features such as wrinkle-angle or unevenness of face surface are extracted via Gabor filters in multiple ROIs on a human face. High angle resolution Gabor filters are used to detect subtle facial expressions and the positions of the detection window and Gabor filter parameters are optimized by a learning process using AdaBoost. Changes to facial expression are estimated by comparing an input image to a learned database with the features. Experimental results showed that the proposed system has a 0.84 precision rate and a 0.91 recall rate in the case of detecting subtle changes.
著者
山川 大貴 福元 清剛 海老澤 嘉伸
出版者
一般社団法人 映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.68, no.6, pp.J232-J237, 2014 (Released:2014-05-23)
参考文献数
18

It is difficult for gaze detection systems to detect pupils in camera images containing eyeglasses reflections caused by the infrared light sources necessary for gaze detection. In a previous study with a system using two cameras, we proposed a geometrical pupil detection algorithm. However, depending on the positional relationship between the pupil and the reflection, the algorithm was not always effective. In the present study, we arranged three cameras—one at each vertex of a triangle—and composed three camera pairs with different base line directions. We propose several new algorisms, and in the basic algorithm, pupil candidates indicating the suprathreshold angle between two planes, each of which includes the cameras composing a camera pair and the candidate detected by one of the two cameras, are removed from the candidate list. A significant improvement of pupil detection is experimentally demonstrated.
著者
池田 拓也 小山田 雄仁 杉本 麻樹 斎藤 英雄
出版者
一般社団法人 映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.67, no.4, pp.J124-J133, 2013 (Released:2013-03-25)
参考文献数
13

Optical consistency between the real world and virtual objects is an important issue in augmented reality (AR). We propose a method to estimate illumination from an object shadow and incomplete object shape information captured by an RGB-D camera. The environmental illumination can be estimated without any prior knowledge of the object shape. The radiance of each light source is computed by solving linear equations derived from color and depth images. Since prior knowledge of the object shape is not necessary, we can flexibly use/combine any objects. Thus, we can use/combine multiple objects in the target scene to increase the accuracy and flexibility. Our experimental results show the characteristics of our proposed method.
著者
宮里 勉
出版者
一般社団法人 映像情報メディア学会
雑誌
映像情報メディア学会誌 (ISSN:13426907)
巻号頁・発行日
vol.67, no.9, pp.J352-J355, 2013 (Released:2013-08-23)
参考文献数
20

We propose a new mobility support device that helps the visually impaired person to avoid colliding with objects in his/her path. The device uses auditory localization of a sound source generated by ultrasonic phased array. The acoustic image is emitted at the real position of the obstacle, so the distance and direction to the obstacle are recognized by the usual auditory lateralization ability of the user. Therefore, using our device needs no special training over a long period of time, which is an advantage over using the white cane and the conventional so-called electronic white cane.