文献一覧: 13426907 (ISSN) - Ceek.jp Altmetrics

1 0 0 0 角膜反射を利用した瞳孔位置検出の高精度化

著者: 海老澤嘉伸中島彩
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.7, pp.1122-1126, 2008-07-01
被引用文献数: 4 11

In general, the relative position between the centers of the pupil and corneal reflection are used for precise eye-gaze detection. Recently, for stable pupil detection under various ambient light conditions, the pupil has been detected by the difference between the bright and dark pupil images. However, due to the difference in acquisition timing between the bright and dark images, the precision of the pupil position easily decreases when the head moves. We propose a compensation method which differentiates those pupil images after shifting one of the images so that the positions of corneal reflections in both images should match, and show its effectiveness.

2008-09-26 03:11:26
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1 0 0 0 ホログラフィ入力に適したインテグラルフォトグラフィ撮影のための複数要素画像の重複記録低減に関する検討

著者: 三科智之山本健詞大井隆太朗奥井誠人
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.7, pp.1132-1137, 2008-07-01
被引用文献数: 5

We describe how to reduce interference between elemental images suitable for production of holograms during integral photography pickup that uses a lens array composed of typical convex lenses used as elemental lenses. We propose the use of an optical system that consists of both a field lens and an aperture that is located in the focal plane of the field lens. The system is arranged between the lens array and the camera used for taking elemental images. Diffraction patterns in the focal plane of the field lens of beams going through elemental lenses were calculated with the Fresnel-Kirchhoff diffraction formula. Consequently, we clarified that the system was able to limit the incident angle of the beam passing through the elemental lenses with the size of the aperture located in the focal plane. In addition, we carried out an optical experiment and proved that using the optical system reduced the interference between the elemental images.

2008-09-26 03:11:21
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1 0 0 0 3-3. 映像表現およびコンピュータグラフィックス(3.メディア情報,<特集>映像情報メディア年報)

著者: 吉川浩津田貴生檜山茂雄新谷幹夫小黒久史
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.8, pp.1255-1258, 2008-08-01
被引用文献数: 1

2008-09-26 03:10:20
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1 0 0 0 第8回画像の本質を引き出す : バイラテラルフィルタによるノイズ除去とイラスト風画像の生成(講座次世代ディジタルカメラ/ディジタルムービーを予測する)

著者: 浦浜喜一
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.8, pp.1268-1273, 2008-08-01
被引用文献数: 8 7

2008-09-26 03:10:13
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1 0 0 0 動画像特徴量と位相限定相関を用いた番組識別実験

著者: 大竹剛真島恵吾合志清一藤井亮介伊藤浩鈴木光義高井重典寛座武智
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.8, pp.1292-1300, 2008-08-01
被引用文献数: 1

As digital broadcasting has become widespread and the available bandwidth for Internet access has become wider, more high-quality digital content has been distributed to users, making illegal copying a critical issue in the content business. New technology for identifying illegally distributed content is necessary to deter it. We developed two methods for identifying video content: the extraction of characteristic information from video and the use of phase-only correlation. A system was developed to apply these methods to digital TV programs. Experiments on four weeks of broadcast content gave good results, which suggests that a combination of the two methods would enable us to identify video content distributed illegally over the Internet precisely and quickly.

2008-09-26 03:10:07
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1 0 0 0 局所境界要素法によるイメージセンサの3次元波動光学シミュレーション

著者: 武藤秀樹須川成利
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.8, pp.1319-1325, 2008-08-01
被引用文献数: 1 1

A novel wave optical simulation method (a localized boundary element method) has been developed. This method enables us to execute 3-D wave optical simulation with much smaller memory space and much shorter calculation time than conventional boundary element methods or FDTD(Finite Difference Time Domain) methods. The color shading characteristics of inner lens structures in CCD image sensors and the light-gathering power and crosstalk of light waveguide structures in CMOS image sensors can be analyzed by this method. This method was found to be powerful and useful for wave optical analysis of image sensors.

2008-09-26 03:09:59
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1 0 0 0 重心ボロノイ図とそのドロネー三角形分割によるノンフォトリアリスティックハーフトーニング

著者: 井上光平浦浜喜一
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.8, pp.1326-1329, 2008-08-01
被引用文献数: 1 1

Non-photorealistic rendering(NPR) methods are presented for generating halftone images using a centroidal Voronoi diagram(CVD) and its Delaunay triangulation(DT). On the basis of the approximation of a CVD by hexagonal lattice, relations of brightness between an input image and its CVD and DT are derived and applied to brightness correction of halftone images. Experimental results showed that the halftone images generated by the proposed methods reproduced the continuous tone of the input image well.

2008-09-26 03:09:38
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1 0 0 0 動作特徴を考慮したモーションキャプチャデータベースの構築と動作生成への応用

著者: 佐藤浩司青木工太長橋宏
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.8, pp.1330-1332, 2008-08-01
被引用文献数: 1

Motion capture data is widely used to easily reproduce natural-looking human motions. However, it is very difficult to search a huge motion database for any particular human motion. A variety of motion retrieval techniques that enable users to find accurately corresponding motions have been proposed. We developed a construction and retrieval technique for the human motion database that considers the overall features of motion by using a dimension reduction technique and a machine learning algorithm. This technique enables efficient retrieval of a set of motions similar to the query. It is also possible to apply our technique to motion synthesis by creating a hierarchical motion graph based on the human motion database.

2008-09-26 03:09:26
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1 0 0 0 任意位置姿勢に配置された複数平面マーカの統合によるオンラインARシステム

著者: 植松裕子斎藤英雄
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 : 映像情報メディア (ISSN:13426907)
巻号頁・発行日: vol.60, no.6, pp.909-919, 2006-06-01

We describe a new on-line AR system, using multiple planar markers placed at arbitrary positions and directions. In most marker-based approaches, the markers' 3D positions and directions need to be measured in advance because they need to define a virtual object's coordinate in one fixed 3D coordinate system. However, such measurement is a very difficult and time-consuming task especially when the markers are in a complex arrangement or are placed in a wide space. Thus, we created a new on-line AR system that does not have any information on the geometrical relationship of the markers. In our registration method, we construct projective 3D space using two reference images, in which we can estimate the geometrical relationship of the multiple markers. By defining the virtual object's coordinate in projective space, this coordinate can be represented in one fixed 3D coordinate system for each frame. We performed some experiments to demonstrate the effectiveness of our system. A virtual object was superimposed onto input image sequences captured with a handy camera. Because the multiple markers were placed in a wide area, the virtual objects could easily move around the real world. Moreover, the registration could be carried out stably because the markers face various directions and because some of them can always be recognized from most viewpoints.