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Method for Processing a Three-Dimensional Image of the Surface of a Tire so That It Can be Used to Inspect the Said Surface

  • US 20110019903A1
  • Filed: 12/16/2008
  • Published: 01/27/2011
  • Est. Priority Date: 12/19/2007
  • Status: Active Grant
First Claim
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1. A method for inspecting a portion of the surface of a tire, said surface comprising markings in relief, wherein the method comprises the steps of:

  • determining the three-dimensional profile of the surface to be inspected;

    locating characteristic points on the surface to be inspected and matching these points with corresponding characteristic points originating from three-dimensional data of a reference surface, so as to create a set of pairs of matched characteristic points;

    in an iterative manner, a first transformation function is sought, applied to the characteristic points of the reference surface, so that the value representing the sum of the distances between each of the characteristic points of the reference surface, transformed with the aid of said first transformation function, and the points of the surface to be inspected that are matched with them, is minimal; and

    applying said first transformation function to all of the points of the reference surface in order to obtain a transformed reference surface,wherein the transformation function is an affine function comprising a homothetic transformation the ratio of which has an absolute value that is different from 1.

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