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Arrangement for sensing the geometric characteristics of an object

  • US 4,175,862 A
  • Filed: 08/27/1975
  • Issued: 11/27/1979
  • Est. Priority Date: 08/27/1975
  • Status: Expired due to Term
First Claim
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1. A method for sensing and locating points on a surface comprising the steps of:

  • generating a projection field directed onto a surface;

    subdividing said projection field into a number of sections;

    irradiating said surface with different variations of said subdivided projection field so that each section is illuminated at least once;

    recording within a field of view images of said surface as irradiated by the subdivided projection field;

    recording a calibrated reference surface and reading said recorded images in relation to said reference surface to define the location of a predetermined point on said first-mentioned surface and appearing within said field of view;

    projecting in sequence by said projection field preselected patterns onto the surface for subdividing the projection field into predetermined sections, said projected patterns on said surface having irradiated sections and non-irradiated sections, each pattern of irradiated sections and non-irradiated sections corresponding to an assigned code;

    said reading step comprising further reading each projected pattern of irradiated and non-irradiated sections and reading the sections in which a preselected point appears;

    combining said patterns for obtaining a predetermined total number of sections, said projection field being subdivided into said total number of sections, the number of said patterns and the total number of sections being related by said assigned code; and

    relating the patterns and sections in which the point appears to identify the position in three-dimensional space of the point on said surface.

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