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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62 巻, 2 号
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ディジタルコンテンツ制作を支える新技術
1. キャラクタアニメーション制作の高能率化手法
2. 放送番組制作技術
3. ディジタルコンテンツの教育利用
4. ユーザの創造力向上を図ったコンテンツ自動生成システムの活用事例
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論文小特集　ディジタルコンテンツ制作－DCS '07関連－
小特集論文
  • 見た目に基づくWebページ検索のための視覚的類似度尺度
    古澤 徹, 渡井 康行, 山崎 俊彦, 相澤 清晴
    2008 年 62 巻 2 号 p. 209-215
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.209
    ジャーナル フリー
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    We are developing a system for retrieving web browsing history based on visual information such as design and layout. This system's performance would be improved by refining the sketch retrieval results. For this purpose, we have developed “color-layout signature,” a visual similarity metric for web pages. We showed that use of the developed metric improves retrieval performance from 27%(conventional method) to 42%.
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  • Time-Varying Meshの編集: 動きの分解と再合成
    徐 建鋒, 山崎 俊彦, 相澤 清晴
    2008 年 62 巻 2 号 p. 216-221
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.216
    ジャーナル フリー
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    A motion parsing and composition technique for editing time-varying mesh (TVM) is described. TVM is a sequence of 3D mesh models, reproducing real-world objects, that is generated from multiple-view images using a shape-from-silhouette algorithm. Because TVM generation is very costly, efficient and effective reuse of TVM is an important issue. A motion database of generated TVM was established by motion analysis using histogram-based feature vectors so that the TVM can be easily accessed and reused. The motion synthesis to compose a new TVM sequence is also proposed. This technique will enable the efficient and effective reuse of TVM.
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  • モーションデータを用いた新体操ルール学習支援システムの試作と評価
    曽我 麻佐子, 明神 由佳
    2008 年 62 巻 2 号 p. 222-226
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.222
    ジャーナル フリー
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    We have developed educational applications to support the learning of rhythmic gymnastics rules using motion-captured animations. We developed a 3D rule book using Web3D technologies and an AR-RG system using augmented reality technologies. The 3D rule book plays 3DCG animations corresponding to the basic motions of rhythmic gymnastics. The AR-RG system helps users understand complicated rules requiring a combination of a basic motion and an apparatus action. These applications were evaluated by active athletes as useful learning tools.
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  • 個人撮影映像を対象とした映像速覧のための“笑い”シーン検出法
    入江 豪, 日高 浩太, 宮下 直也, 佐藤 隆, 谷口 行信
    2008 年 62 巻 2 号 p. 227-233
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.227
    ジャーナル フリー
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    A method is described for detecting a “laughter” scene in a Consumer Generated Video (CGV). The growing number of CGVs is growing, so a video skimming method that allows viewers to quickly find “enjoyable” scenes would be useful. An experiment showed that viewers tend to find CGVs that include a “laughter” scene “enjoyable”. On that basis, we developed a method for detecting “laughter” scenes using prosodic information such as pitch, energy, power spectrum densities and their differential components to estimate the probability of laughter in the soundtrack. In this method, a generalized state space model, which consists of acoustic models and a state-transition model, calculates the probability of laughter to detect a “laughter” scene. An experiment showed that the precision rate of the method was about 83%, which suggests that the method enables effective video skimming.
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  • 直感的に影を演出可能な編集ツール
    中嶋 英仁, 杉崎 英嗣, 森島 繁生
    2008 年 62 巻 2 号 p. 234-239
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.234
    ジャーナル フリー
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    Shadows in cartoon animation are generally used for dramatizing scenes. In hand-drawn animation, these shadows reflect the animators' intention and style rather than physical phenomena. On the other hand, shadows in 3 DCG animation are photorealistically rendered, and animators can not fully reflect their intention. This is because, in 3DCG animation, shadows are automatically generated once the light source is defined. Therefore, we develop an interactive tool for editing shadows that combines the advantages of hand-drawn animation and 3DCG technology. the advantage of our tool is that shadow attributes are inherited once animators edit the shape and location of shadows. Animators are only required mouse operations for editing shadows. Consequently, our tool enables animators to create shadows automatically and easily to reflect their intention and style.
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  • 高解像度映像からの視聴者の注目点を考慮した講義映像の自動生成
    篠木 雄大, 藤吉 弘亘
    2008 年 62 巻 2 号 p. 240-246
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.240
    ジャーナル フリー
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    A method for producing a dynamic lecture video from high resolution video recorded by an HDV camcorder is described. In this method, the high resolution video is cropped to focus on the region of interest, such as the instructor. Because this method uses virtual camerawork modeled on broadcast camera techniques, the generated video is very similar to professional broadcast video. Moreover, by focusing the viewer's attention on the chalkboard, the generated video is useful for students. We evaluated our method with subjective experiments and confirmed its effectiveness.
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  • Hitch Haiku ～コンピュータによる俳句創作支援システム～
    土佐 尚子, 尾原 秀登, 美濃 導彦, 松岡 正剛
    2008 年 62 巻 2 号 p. 247-255
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.247
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    The authors maintain that there are unique and common forms of cultures that humans set aside such as the behavior and grammar within each culture. We suggest a computer model of this and a method of interactive expression and experiencing cultural understanding using IT called "cultural computing". This paper describes Hitch Haiku, a system based on cultural computing that interactively aids users in generating haiku, the world's shortest poems with imagery-maximizing mechanisms. First, "kire-ji" and particles are added to the word (s) input by a user to make a five or seven-character phrase, then phrases including terminology related to the user's input are located in a phrase database holding examples of haiku from the literary calendar, ensuring the cultural validity of the haiku. These phrases are then "hitched" together to generate a haiku. Although the haiku generated by this system have periodically resulted in flawed haiku, the ability to generate haiku that support the expansion of users' minds has been confirmed through assessment experimentation.
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小特集研究速報
論文
  • 異種符号化映像フォーマットの総合画質評価
    中須 英輔, 神田 菊文, 市ヶ谷 敦郎, 黒住 正顕, 西田 幸博
    2008 年 62 巻 2 号 p. 262-270
    発行日: 2008/02/01
    公開日: 2010/05/01
    DOIhttps://doi.org/10.3169/itej.62.262
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    We present a subjective quality assessment scheme for digitally coded motion pictures in multi-formats. Several scanning formats are available in digital broadcasting, and broadcasters can select an adequate delivery format according to the overall picture quality and transmission bit-rate. Thus, the overall quality of digitally coded pictures should be evaluated in terms of both coding degradation and image resolution. This assessment-test scheme enables a direct comparison of picture quality of different scanning formats based on the double stimulus impairment scale (DSIS) method recommended in Rec. ITU-R BT.500. We show results of assessment tests performed on 1080i, 720p, and 480p videos encoded in the MPEG-2 video standard and give some consideration to picture quality in digital broadcasting.
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