Mr. Kazuho Kito Profile

Kazuho Kito

at Tokyo Denki Univ.

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Publications (2)

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Proceedings Article | 16 July 2021 Paper

Aperture localization based on vibro-stimuli generated from distance variation

Itta Endo, Shinichiro Morita, Kazuho Kito, Harumi Kobayashi, Naoki Mukawa, Akio Nakamura

Proceedings Volume 11794, 117940A (2021) https://doi.org/10.1117/12.2589107

KEYWORDS: Visualization, Optical flow, Haptic technology

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The purpose of this research is to verify that the proposed method, which generates vibro-stimuli according to the distance variation, has a capability of supporting depth edge detection for aperture localization. We have proposed a method to support the visually impaired understanding their surrounding environment via modality conversion from distance variation to haptic vibration information, and have developed the wearable device to provide the user with vibro-stimuli generated from visual variation inspired by optical flow characteristics. The characteristic of this vibration stimulus is that the user feels a strong vibration when the distance difference per unit time is large. It is inferred that this feature is effective in perceiving the boundary of obstacles, i.e., depth edge, which may contribute to the user's aperture localization. To verify the effectiveness of the proposed method, an aperture localization experiment was conducted to compare it with the ETAslike conventional method by changing the number of vibration motors and the method of vibration stimuli. We asked six blindfolded subjects to guess the location of the aperture. The experimental results showed that the proposed method achieved using a single motor a 98.3% correct rate. The contributions of this research are to propose the way of vibrostimuli based on distance variation for aperture localization, which is one of the important environmental elements, and to validate its effectiveness.

Proceedings Article | 1 June 2020 Paper

Environment understanding during walking via modality conversion from visual to haptic information: localization experiment with vibro-stimuli simulated by optical flow

Shinichiro Morita, Yoshihiro Kanehara, Kazuho Kito, Harumi Kobayashi, Naoki Mukawa, Akio Nakamura

Proceedings Volume 11515, 1151511 (2020) https://doi.org/10.1117/12.2566949

KEYWORDS: Visualization, Optical flow, Sensors, Information visualization, Haptic technology, Optical simulations, Actuators, Prototyping, Head, Distance measurement

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The purpose of this research is to propose the method providing the visually impaired users with environment understanding via modality conversion from visual distance to haptic vibration information. According to studies on ecological perception, optical flow, which represents dynamical visual variation, plays significant roles in environment understanding for human. We have developed a head-mounted wearable device equipped with a 2-dimensional distance sensor and five vibro-motors arranged around the head. The vibration magnitude of vibro-motors is defined as not static distance to the obstacle but dynamic distance variation caused from the user movement. The vibro-stimuli are generated based on the optical flow characteristics. Thus, if the user moves to the obstacle dynamically, the user feels stronger vibration; in contrast, if the user pauses, the user feels no vibration since the distance to obstacles keeps constant. To evaluate basic performance of the proposed method, we asked five blindfolded subjects to walk toward the wall 50 times each. First 10 trials performed by each subject are considered as practice phase; hence, the remaining 40 trials are evaluated. In total 200 trials, the 97.5% of trials are considered as success ones; the almost subjects were able to perceive the wall existence and stopped without the collision with the wall. The experiment demonstrated the basic validity of our proposed method. The main contribution of this paper is utilizing dynamic distance variation to determine vibration magnitude and providing the user with vibro-stimuli simulated by optical flow to support the user’s localization in the environment.

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