著者
橋本 明記 井上 康夫 松本 英之 方田 勲 上田 和也 市川 鋼一 佐藤 彰 柴田 豊 石原 友和 太田 陽介 野崎 秀人 北之園 展 斉藤 知弘 筋誡 久 小島 政明 鈴木 陽一 田中 祥次
出版者
The Institute of Image Information and Television Engineers
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.63, no.7, pp.957-966, 2009-07-01
被引用文献数
9 1

Three channels, which will cease to be used for analog satellite broadcasting in July 2011 and 4 channels of the BS-17 19, 21, and 23ch, which were assigned to Japan at the WRC-2000, will be used for new digital broadcasting services after 2011. In these channels, a new broadcasting system called "Advanced Digital Satellite Broadcasting System" will be available as well as the current ISDB-S one. The new system can increase transmission bit rate by 30%compared with the current ISDB-S system by using LDPC codes and a roll-off factor of 0.1. The Association of Radio Industries and Businesses (ARIB) conducted evaluation tests to acquire its C/N-BER and synchronous performance as well as confirm how well the TMCC signal functions. Demonstrative tests to transmit Super Hi-Vision were also performed. The tests were done using a satellite simulator and a real satellite transponder. The tests showed that the system performed very well, and the details are reported here.
著者
坂本 泰宏 稲蔭 正彦
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.63, no.1, pp.66-75, 2009-01-01
参考文献数
10
被引用文献数
3 1

The purpose of this study is to make moving images not from illumination-controlled intermittent motion but from physically contiguous motion. If the apparent motion can be produced by step motion and explained by a physical model, a distinction between real motion and apparent motion, which have been thought to be completely different, can be discussed. In our research, we have tried to design new moving image media using a mechanical method as a substitute for the optically controlled method (i.e. slits or strobe). Additionally, experiments were implemented about the perception of the apparent motion produced by step motion with our system. As a result, it became clear that the perception of apparent motion differs between individuals. This theory of moving image perception makes it possible to make moving images by using methods different from the existing one.
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
星野 聖
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.55, no.11, pp.1539-1542, 2001-11-20
参考文献数
12
被引用文献数
3 1

テレビ映像や擬似3次元映像観視時の生体負担の実時間推定を目的として, 瞼裂幅, 眼球運動, 瞳孔反応の影響が少ない眼球回旋運動計測システムを設計した.さらに, 両眼球で回旋運動計測を試みたところ, 強負荷時には, 左右眼の回旋が逆になる傾向が見られた.
著者
竹田 夏木 清川 清 竹村 治雄
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 = The journal of the Institute of Image Information and Television Engineers (ISSN:13426907)
巻号頁・発行日
vol.63, no.6, pp.794-800, 2009-06-01
参考文献数
16
被引用文献数
5

In a virtual reality (VR) environment, a wide field-of-view (FOV) image contributes to improve the immersive experience and situation awareness. The typical FOV of a head mounted display (HMD) is around 20 to 40 degrees, and widening this has been a technological challenge for decades. We designed a new HMD that has a hyperbolic half-silvered mirror. This HMD can resolve the technological challenges and provide a wide FOV, large observational pupil, and optical see-through display. We made a prototype HMD and a VR walkthrough system that displays a pair of stereo images with a FOV of over 120 degrees. This paper reports our HMD ' s basic concept and the implementation of the prototype.
著者
長谷川 誠 田島 慎一
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 : 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.59, no.5, pp.786-790, 2005-05-01
参考文献数
9
被引用文献数
3

We propose applying of the ridgelet transform to semantic objects segmented using watershed segmentation. The ridgelet transform effectively represents objects with singularities along lines; therefore, it is a powerful tool for coding. Moreover, it can easily rotate blocks in the ridgelet domain. Nevertheless, the targets to be roteted are not rectangular blocks but real objects. For that reason, we divide pictures into semantic objects using watershed segmentation, then convert each object into the ridgelet domain so they can be rotated easily. We experimented in coding and rotating objects.
著者
本山 信明 日和佐 憲道 原田 亞矢子 松田 幸成 坂手 寛治 宮野鼻 晃士 猪股 英樹
出版者
The Institute of Image Information and Television Engineers
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.63, no.12, pp.1860-1867, 2009-12-01
参考文献数
10
被引用文献数
1

We have developed a single-chip HDTV encoder LSI for H.264/AVC High422P@L4.1 that is optimized for broadcasting transport systems. Significant bit-rate reduction around 50% or more relative to MPEG-2 can be achieved by originally developed motion vector coding algorithm and subjective quality enhancement through adaptive bit allocation considering human visual system. It also enables low-delay encoder implementation with at shortest 50ms encoding delay, with advanced coding control that optimizes the balance of buffering delay and coded image quality as well as variable delay time control mechanism. We adopt a hierarchical multi-CPU framework and CPU interface those enable flexible encoder control per GOP/Picture/MB, to realize various image quality and encoding delay adjustments. This LSI is fabricated in a 90-nm CMOS process and can be integrated in a 9x9 mm<sup>2</sup> chip.