映像情報メディア学会誌
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
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61 巻, 6 号
選択された号の論文の29件中1～29を表示しています
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ふぉーかす
講演
小特集
ホログラム記録の現状と実用化への道
1.総論
2.各種記録方式の最新技術
2-1.二光束干渉法
2-2.コリニア方式
2-3.記録メディア
3.ホログラムメモリー標準化動向
技術解説
話題
講座
マルチメディアコンテンツフォーマットの実際
～放送・通信サービスを実現させた各種フォーマット～
知っておきたいキーワード
報告
フレッシュアイズ　～映像研究現場紹介～
ニュース
論文目次（論文・研究速報）
論文小特集　ヒューマンインタフェースとバーチャルリアリティ
小特集論文
  • 対話型似顔絵作成システムNIGAO
    中洲 俊信, チャンドラシリ N.P., 苗村 健, 原島 博
    2007 年 61 巻 6 号 p. 779-788
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.779
    ジャーナル フリー
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    A caricature can express an artist's impression of the target face.We propose an interactive facial caricature drawing system "NIGAO".Our aim is to create a system that can be used by anyone to synthesize a caricature with one's impression of the target face.NIGAO has two modes:"selection and adjustment of facial parts mode",in which the user can directly manipulate the location or geometry of facial parts,and "interactive genetic algorithm (IGA) mode",in which he or she can use [facial characteristics from] a group of caricatures to influence her desired caricature by selecting some of them as the dominant genes.Users can switch between modes when needed.We let 15 users imagine the faces of two famous people and synthesize their caricatures using NIGAO.Results of this experiment show that a caricature synthesized using the latter mode after using the former mode reflects the artist's impression of the target face better than caricatures synthesized using only the former mode.These results also demonstrate the effectiveness of NIGAO's interface for synthesizing caricatures.
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  • 拡張現実表示技術を用いたギターの演奏支援システム
    元川 洋一, 斎藤 英雄
    2007 年 61 巻 6 号 p. 789-796
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.789
    ジャーナル フリー
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    The complex and unfamiliar hand positions required to produce notes on the guitar mean that a beginner player usually finds learning to play a difficult process.We propose a system that makes use of augmented reality.The way to correctly hold the strings is shown by overlaying virtual hand models and lines onto a guitar via a display.By mirroring their hand movements with the image shown on a visual guidance,the player learns the correct hand positions.Accurate registration between the visual guidance and the guitar is a vital part of this system,so we need to track both the hand positions and the position of the guitar.We also propose a method of tracking the guitar by hybridizing a visual marker and the natural features of the guitar.Our tracking method enabled the system to continually display visual guides at the required position.
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  • PALMbit:掌への光投影を利用した身体インタフェース
    山本 豪志朗, 佐藤 宏介
    2007 年 61 巻 6 号 p. 797-804
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.797
    ジャーナル フリー
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    We propose a projection-based wearable system,"PALMbit",which enables user's palms to input control events and to output graphic information.The I/O interface for wearable computers depends largely on their practical applications.In the proposed system,we developed both an input and output method for controlling digital appliances; an optical projection onto the user's palm,which is registered by image processing,and a gesture interface based on nger actions.By projecting an image of a virtual remote controller onto the user's palm,the user is able to control digital equipment intuitively using his/her own mental body image and a haptic feedback.Experimental results with a prototype application on the proposed I/O methods show that the naturalness of images projected onto palms is superior to that of HMD-based images.
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  • 高齢者に着目した3次元仮想空間インタフェースの評価
    井上 雅之, 大谷 佳光, 羽鳥 好律
    2007 年 61 巻 6 号 p. 805-813
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.805
    ジャーナル フリー
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    As society is aging,we need an interface that is appropriate for elderly people. A three-dimensional cyberspace that closely resembles the familiar real world seems promising because it supports the metaphor effect. We evaluated the metaphor effect and operating environments for elementary students,adults,and elderly people. Application of ANOVA (analysis of variance) to the evaluation data clarified the differences between elderly people and the other groups. Testing of an interface based on this approach showed that elderly people can benefit from the application of the three-dimensional cyberspace metaphor. They felt that the interface,which can be configured to provide low degrees of input freedom,was both easy and interesting to use.
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  • モアレを低減したインテグラルビデオグラフィ
    小池 崇文, 及川 道雄, 宇都木 契
    2007 年 61 巻 6 号 p. 814-821
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.814
    ジャーナル フリー
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    We propose using moiré reduction methods for integral videography displays.Integral videography is based on the principles of integral photography and extended real-time video processing.There are two moiré reduction methods that can be used for integral videography displays that have a lens array and a liquid crystal display.The first is color moiré,and the second is intensity moiré.To reduce color moiré,we used an optimized color filter layout in the liquid crystal display.To reduce intensity moiré,we used a defocus method.We also present a design of a viewing area for the integral videography display.To control the viewing area,we changed the lens pitch and shape of the integral videography elemental image.We implemented a 5-inch integral videography display using the proposed methods,and evaluated the integral videography display.
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小特集研究速報
論文
  • SAを用いたカラー画像のハーフトーン処理
    田中 賢一
    2007 年 61 巻 6 号 p. 828-837
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.828
    ジャーナル フリー
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    Introducing simulated annealong (SA) into the halftoning of a color image creates a halftoning method that is superior to genetic algorithm (GA).This is because SA doesn't generate discontinuity in the boundary area of GA,and the processing speed of SA is faster than that of GA.Thus,SA is a suitable way of solving the combinational optimization problem.When SA was introduced into the halftonig of the color image both the color image produced and the generation of the color other than white and the black at the gray-scale area (R=G=B) does not exist.
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  • 映像・音声認識,自然言語処理の適用によるメタデータ生成の作業コスト削減効果に関する考察
    桑野 秀豪, 松尾 義博, 川添 雄彦
    2007 年 61 巻 6 号 p. 842-852
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.842
    ジャーナル フリー
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    We propose a task model that semi-automatically generates scene-based metadata based on mediaanalysis technology such as audio/visual indexing and natural-language processing to reduce the costs of generat-ing metadata.Our task model can shorten the task time by reusing both the results of media analysis and existingtext information such as program scripts.SceneCabinet,a metadata generation and editing system,can automati-cally extract scene-based metadata from videos.The system extracts meaningful video slices and textual informa-tion such as scene titles,synopses,and keywords using natural-language processing based on the results of speechrecognition and video OCR.Moreover,the system can import program scripts and use them to automaticallyextract keywords.SceneCabinet provides an intuitive user operation interface including a video browser with keyimages that are automatically detected based on scene changes,on-screen text,camerawork,speech,and music.Experiments showed that SceneCabinet could significantly reduce metadata generation costs.
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  • レベル制御とサイドローブ制御を用いたアレーアンテナの等ミニマム指向性
    大久保 茂
    2007 年 61 巻 6 号 p. 853-859
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.853
    ジャーナル フリー
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    We describe a new way of obtaining a radiation pattern that has equal minimum levels of the lineararray antenna. By using this method we simultaneously control both the minimum level of the sidelobe and thelevel in arbitrary directions in the radiation pattern. The radiation pattern obtained with this method is almostisotropic. The radiation pattern is obtained by controlling only the amplitudes of the currents. The amplitudes ofthe currents are designed using digitally controlled attenuators. As these attenuators can be accurately changed insteps of 0.3 dB or less,the resulting quantization error will affect the radiation pattern. The effects of quantizationerror on the radiation pattern are thus verified.
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  • ディジタルマルチメディアコンテンツの視聴履歴の効果的共有
    石川 浩一郎, 岡 誠, 櫻井 彰人, 國藤 進
    2007 年 61 巻 6 号 p. 860-867
    発行日: 2007/06/01
    公開日: 2009/11/20
    DOIhttps://doi.org/10.3169/itej.61.860
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    We propose a new multimedia viewing environment in which users can effectively share their histories of viewing digital content. A viewing history is a record of which parts of the content the user viewed and/or listened to (and how many times) and which parts the user skipped. Since the parts viewed more frequently should reflect their importance, an effectively utilized viewing history can facilitate browsing of the content by new viewers. To demonstrate the feasibility of our proposal, we constructed a digital media viewing environment in which an automatically updated summary of the viewing histories of other users could be downloaded from and one's own viewing history could be uploaded to a database on a server through the Internet. Testing in this environment demonstrated that the summary of the viewing histories of other users enhances a new viewer's browsing of content.
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