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Journal of mechanical science and technology v.24 no.6, 2010년, pp.1261 - 1264   SCIE
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Newly developed walking apparatus for identification of obstructions by visually impaired people

Okayasu, Mitsuhiro    (Department of Machine Intelligence and Systems Engineering, Akita Prefectural University  );
  • 초록

    In this work, two visual systems to help visually impaired people walk were developed: the first is a white cane with a non-contact detection system, and the second is a three-dimensional (3D) visual system. In place of the sense of sight, the sense of touch, either via vibration or of pins, can relay information on objects and obstacles around people. In a white cane non-contact detection system, two sets of ultrasonic sensors and vibrators, respectively, are employed to indicate the positions of both low- and high-level obstructions in front of the visually impaired person. When objects are detected by the sensor, the vibrator is strongly activated. In this system, the range of obstruction detection can be adjusted between 0.5 m and 5.5 m. By comparison, the 3D visual system uses two different components, an infrared camera sensor to detect obstructions and a tooling apparatus, incorporating a number of 1 mm diameter pins, by which their 3D shapes are derived. The pins are arranged in a $10{\times}10$ matrix and move longitudinally between the retracted and extended positions based on the depth data between the infrared sensor and the obstruction. Pins are elongated individually, so that each pin tip represents a specific area of the outer surface of the object. This tactile 3D image can provide effective object information.


  • 주제어

    Visually impaired person .   Walking apparatus .   Ultrasonic sensor .   Infrared sensor .   White cane.  

  • 참고문헌 (7)

    1. Flickr, Available online at: http://www.flickr.com/photos/ sightsavers/3311835378/(accessed 28-7-2009). 
    2. Y. Mine, Guide system for visually impaired people. Japan Patent, 2002-219142 (2002). 
    3. Y. Kondo, T. Shinbashi, Guide system. Japan Patent, 8- 66441 (1996). 
    4. I. Miya, Support system for visually handicapped people. Japan Patent, 2001-319289 (2001). 
    5. J. Ogawa, K. Aonuma, White cane for visually handicapped people. Japan Patent, 2003-265559 (2003). 
    6. Y. Shimizu, Sound guide system and sound guide method. Japan Patent, 2007-257463 (2007). 
    7. M. Okayasu. The development of a visual system for the detection of obstructions for visually impaired people. Journal of Mechanical Science and Technology, 23 (2009) 2776- 2779.     

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