Development of a Real-Time Range Finder for Measuring the Depth to a Plane without Textures

Yutaka Tanaka, Isaku Nagai, Akio Gofuku, Hiroyukl Miyamoto

Research output: Contribution to journalArticlepeer-review


In order to apply to the eyes of an autonomous running vehicle, a real-time range finder has been developed that can measure the distance to every point on the plane without any pattern and its inclination. Though it seems contrary to the fact that the parallax is inversely proportional to the distance, this paper derives the mathematical grand that the plane in a real three dimensional space (X, Y, Z) is mapped also into the plane in a parallax space (x, y, Δx). On this grand, an electronic circuit has been manufactured which can compute in video rate the interpolation value between the parallaxes at two characteristic points by using several CPLDs. It is also shown that this device is applicable to the measurements of the slant angles of and the directions normal to the simple plane.

Original languageEnglish
Pages (from-to)3234-3238
Number of pages5
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number636
Publication statusPublished - 1999


  • Distance Image
  • Electronics
  • Measurement
  • Mechatronics and Robotics
  • Optical Measurement
  • Real-Time Measurement
  • Sensor
  • Shape Measurement
  • Stereo Vision
  • Visual Equipment

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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