The development of a visual system for the detection of obstructions for visually impaired people

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4 Citations (Scopus)


In this paper, the author presents a new visual system that can aid visually impaired people in walking. The system provides object information (that is, shape and location) through the sense of touch. This visual system depends on three different components: (i) an infrared camera sensor that detects the obstruction, (ii) a control system that measures the distance between the obstruction and the sensor, and (iii) a tooling apparatus with small pins (φ 1 mm) used in forming a three-dimensional shape of the obstruction. The pins, arranged on a 6×6 matrix, move longitudinally between the retracted and extended positions based on the distance data. The pin extends individually, while the pin tip reflects the object's outer surface. The length of the pin from the base surface is proportional to the distance of the sensor from the obstruction. An ultrasonic actuator, controlled at a 15Hz frame rate, is the driving force for the pin movement. The tactile image of the 3D shape can provide information about the obstruction.

Original languageEnglish
Pages (from-to)2776-2779
Number of pages4
JournalJournal of Mechanical Science and Technology
Issue number10
Publication statusPublished - Oct 2009
Externally publishedYes



  • Blind
  • Infrared camera sensor
  • Ultrasonic actuator
  • Visual system

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

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