映像情報メディア学会誌
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
67 巻 , 12 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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論文特集 ヒューマンインフォメーション ~情報メディアに対する人間特性~
特集論文
  • 小川 修平, 杉田 尚基, 岩井 大輔, 佐藤 宏介
    2013 年 67 巻 12 号 p. J425-J433
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    We introduce a fingertip touch recognition technique for general surfaces and a technique that estimates the direction of force on the basis of processed fingertip images captured by an overhead camera. When a finger presses on a hard surface, the distribution of color in the fingernail changes in accordance with the force applied. The first technique classifies the fingertip state (“press” or “non-press”) on the basis of the fingernail color information in the captured images. We use multiple EigenNail classifiers to achieve accurate classification of fingertip state under various lighting conditions. The second technique estimates the force direction by measuring the displacement of the fingertip. Through user studies, we demonstrated the feasibility of the proposed fingertip touch recognition techniques and were able to produce design guidelines for a pointing interface based on the proposed techniques.
  • 渡邊 紀文, 森 文彦, 大森 隆司
    2013 年 67 巻 12 号 p. J434-J440
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    In daily life, our behavior is guided by various visual stimuli such as the information on direction signs. However, our environmentally based perceptual capacity is often challenged in crowded circumstances, or more so, in emergency evacuation circumstances. In these situations, we often fail to pay attention to important signs. In order to achieve more effective direction guidance, we considered the use of unconscious reflexes in human walking action. In this study, we experimented with vision-guided walking direction control by optic flow stimulus combined with body sway. We observed a shift in subjects' walking direction and body sway and discuss the possible mechanism.
  • 鈴木 淳也, 守井 清吾, 篠原 寛明, 広林 茂樹
    2013 年 67 巻 12 号 p. J441-J447
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    Visually impaired persons typically visualize graphical information through the tactile sensation of a pin matrix display. Unfortunately, the panel of a pin matrix display has a small gross area, the size of a postcard, so it is hard for several people to touch the panel and share the same information concurrently. Moreover, while the display is suitable for presenting a static figure, it is difficult to visualize a moving image with one's fingers. To solve these problems, we focused on the resolution of time in the sense of hearing, and conducted research on using sound from speakers arranged in a matrix to present both static and moving figures that can be shared by several people simultaneously. This paper describes an experiment we conducted to determine whether people could recognize the stroke order of the uppercase alphabet. Sound was broadcast from the various matrix speakers as if it were moving. Participants had a high average for correctly recognizing the alphabetic characters, demonstrating that people are able to recognize graphical information transmitted as moving sound.
  • 守井 清吾, 石井 雅博, 鈴木 淳也, 川原 茂敬, 広林 茂樹
    2013 年 67 巻 12 号 p. J448-J454
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    Understanding, creating, and transmitting texts and figures is important in an information-based society. While systems that help visually impaired people understand, create, and transmit texts are available, ones to , help them create figures are still needed. We are developing a pilot system that enables them to draw tactile figures with their fingertips using a tactile display and computer vision techniques. Experimental evaluation of the usability of the system in comparison with that of a pen-input drawing system showed that is more effective?
  • 木室 俊一, 岩井 大輔, 佐藤 宏介
    2013 年 67 巻 12 号 p. J455-J462
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    We propose the a process concept of delayed tracking projection (DTP) for handheld projectors, in which (1) a pointer cursor sticks to the optical axis of the projector, (2) a user can moves the cursor in projected contents by moving the projector, and (3) the center of the contents tracks the cursor with a short delay. We combine the this DTP technique with a goal crossing interface. The aim objective of this paper study is to conduct an user experiment to understand determine how to design the an interface which that allows users to perform quick goal crossings at a low false selection rate. The Results of an experiment we conducted with a prototype system revealed the effects of delay, target distance, and target direction on goal crossing performances.
  • 関根 雅人, 小川 克彦
    2013 年 67 巻 12 号 p. J463-J471
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    Motion graphics is a form of visual expression characterized by non-narrative, non-figurative based visuals that change over time. Due to the expansion of its application areas, a consideration of the affective quality of motion graphics is growing more important. This paper proposes an arousal estimation method that uses optical flow analysis as an affective quality assessment method for motion graphics. The primary objective is to verify two indexes: the total flow amount and the average magnitude of motion vectors. According to correlation analyses between each index and the arousal factor scores of video stimulus derived from an impression test with human participants, the correlation between the average magnitude of motion vectors and the arousal factor scores is significant. An analysis of the distribution of displacements showed that about three pixels per 33.3 msec is the border value: a higher ratio of movement slower than that border reduces the arousal level, and faster movement raises the level.
特集研究速報
論文
  • 鈴木 慎一, 小郷 直人, 濱住 啓之, 府川 和彦, 鈴木 博
    2013 年 67 巻 12 号 p. J488-J496
    発行日: 2013年
    公開日: 2013/11/25
    ジャーナル フリー
    We have been developing a portable digital transmission system for next generation television called “Super Hi-Vision (SHV)” with hundreds of Mbps-class transmission and high link reliability. To fulfill these requirements, we have been researching a multiple-input multiple-output (MIMO) multiplexing technology using a millimeter-wave (42/55-GHz) band allocated for broadcasting organizations. In this paper, we propose a low-complexity MIMO detection scheme that uses block QR decomposition with M-algorithm to reduce the computational complexity of the maximum likelihood detection (MLD) method. In the proposed algorithm, a MIMO channel is converted into a block upper triangular matrix multiplied by a unitary matrix and divided into some small block matrices. Then, the transmit signals are selected by Manhattan metrics to reduce the complexity, and squared Euclidean metrics of the selected signal candidates are calculated in these block matrices. Computer simulations with a correlated 4 x 4 MIMO channel demonstrate that the proposed scheme shows almost the same BER performance as that of the MLD and better BER performance than that of the conventional QRM-MLD (QR decomposition with M-algorithm MLD) with less complexity.
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