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Method of automatically measuring the shape of a continuous surface

  • US 4,842,411 A
  • Filed: 02/06/1986
  • Issued: 06/27/1989
  • Est. Priority Date: 02/06/1986
  • Status: Expired due to Fees
First Claim
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1. Method of performing 3-dimensional measurement of the shape of a surface portion of an object within a field of view comprising the steps of:

  • (a) projecting one light pattern upon said surface portion, said pattern having a periodic, smoothly varying light intensity pattern along a first direction across said surface portion;

    (b) electronically producing a pair of stereo images of said surface portion illuminated in accordance with step (a), said images stored as first and second arrays of discrete grey-scale values;

    (c) measuring positional placement of corresponding homologous points in said first and second arrays and producing a third array of accumulated parallax data for a substantial number of pairs of said corresponding points; and

    (d) converting said accumulated parallax data to a fourth array of depth data indicative of displacement of said surface portion from a given datum plane, to define the shape of said object.

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