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Range finder device and camera

  • US 20030193657A1
  • Filed: 04/22/2003
  • Published: 10/16/2003
  • Est. Priority Date: 05/25/1998
  • Status: Active Grant
First Claim
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1. A range finder device, for measuring, when a plurality of projected lights having radiation patterns whose light intensity differs three-dimensional space-wise are irradiated onto an object from a light source on a time-sharing basis to image-pick up reflected light of said projected light from said object with a camera, a distance using the light intensity of an image picked up, characterized in that, with respect to each of a plurality of surfaces including the center of said light source and the center of a lens, there is obtained, in advance, relation between an angle of each projected light from said light source and light intensity in each surface, characterized in that, at the time of actual distance measurement, light intensity of each pixel of said camera is measured, and on the basis of the light intensity thus measured, and relation between said angle and said light intensity on a predetermined surface corresponding to a coordinate position of said pixel measured, there is obtained said angle corresponding to said light intensity of the predetermined pixel thus measured, and characterized in that, on the basis of these light intensity measured, said angles obtained and further two-dimensional coordinate position information on said predetermined pixel on the image, a distance to said object is calculated.

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