映像情報メディア学会誌
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
62 巻 , 10 号
選択された号の論文の27件中1~27を表示しています
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  • 今村 弘樹, 藤村 誠, 黒田 英夫
    2008 年 62 巻 10 号 p. 1618-1623
    発行日: 2008/10/01
    公開日: 2010/05/01
    ジャーナル フリー
    Clustering methods, which are based on Self-Organaizing Map, can not precisely classify data when noise data is included. We describe a clustering method that can precisely classify data even when noise data are included.
  • 松井 利一, 鈴木 康之
    2008 年 62 巻 10 号 p. 1624-1632
    発行日: 2008/10/01
    公開日: 2010/05/01
    ジャーナル フリー
    This paper clarifies the relationship between the accommodation mechanism and the image processing mechanism in human vision. The stimuli used in the experiments were moving plaid sine waves composed of two kinds of drifting sine waves with different spatial frequencies and moving directions. The motion perception states were specified, and the accommodative responses were measured using an infrared optometer, while focusing on two kinds of drifting components or their coherent component. The following results were obtained: (1) when the perception was switched between motion transparency and motion capture, the accommodation lag for motion capture was larger than that for motion transparency; (2) in coherent motion perception, the accommodation lag increased as the coherent component's spatial frequency decreased; (3) when the perception was switched among the above three types of perception, the accommodation lag for motion capture and that for coherent motion perception were almost the same and larger than that for motion transparency. These results suggest that the accommodation mechanism interacts with the image processing mechanism that includes the local motion and the coherent motion detection mechanisms.
  • 庄司 竜太, 新田 直子, 馬場口 登
    2008 年 62 巻 10 号 p. 1633-1640
    発行日: 2008/10/01
    公開日: 2010/05/01
    ジャーナル フリー
    When a scene is recorded with a camcorder, there may be disruptions such as object interference or battery exhaustion resulting in missing segments in the recorded video. A temporal video completion method that inserts a video segment captured by another camera in the place of such a faulty segment is proposed. In the proposed method, a user initially uses an interface to select both faulty and preferred segments from videos captured by two different cameras. To minimize the visual difference at the transition points between the two videos, the most similar frames to those previous to and following the faulty segment are detected around both ends of the preferred segment as the start and the end frames of the inserted segment. Note that, in order to prevent artifacts as much as possible, the length of the inserted segment can be different from the length of the faulty segment. Visually plausible video completion is then achieved by smoothing the motion and color gaps between the transition frames and completing the missing regions by using spatio-temporal features of the video. Experiments were conducted to evaluate the visual plausibility of the completed videos by changing the distance between the camera and the recorded target or between two cameras.
研究速報
  • 大川 裕司, 宮川 和典, 松原 智樹, 菊地 健司, 鈴木 四郎, 久保田 節, 江上 典文, 谷岡 健吉, 小林 昭
    2008 年 62 巻 10 号 p. 1641-1648
    発行日: 2008/10/01
    公開日: 2010/05/01
    ジャーナル フリー
    A reliable 15-μm-thick high-gain avalanche rushing amorphous photoconductor (HARP) film with an avalanche multiplication factor of about 200 has been developed. High-sensitivity HARP photoconductive film, which makes use of the avalanche multiplication phenomenon, has been investigated for the purpose of reporting breaking news at night or producing nature and science programs. HARP films that are thicker and more sensitive than previous 8-μm-thick ones have been studied. However, thickening the HARP film caused defects to appear during shooting intense spotlights. Controlling the operating temperature of the 15-μm-thick HARP film over 30°C was found to prevent the occurrence of defects. Moreover, heat resistance of the film was improved to resist temperatures of over 30°C.
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