Patent ID: 8498467
Filing Date: 2013-07-30
Classification: G06T

Abstract:
1. A machine implemented method for inspecting a portion of the surface of a tire comprising markings in relief, the method comprising: determining a three-dimensional profile of the surface to be inspected; locating characteristic points on the surface to be inspected, by a processing device; matching the located characteristic points with corresponding characteristic points from three-dimensional data of a reference surface, to create a set of pairs of matched characteristic points, by the processing device; determining in an iterative manner by the processing device, a first transformation function that minimizes a value representing a sum of the distances between each of the characteristic points of the reference surface, when the characteristic points of the reference surface are transformed by the first transformation function, and the respective matching characteristic points of the surface to be inspected; and applying the first transformation function to all of the points of the reference surface to transform the reference surface, by the processing device, wherein the transformation function is an affine function comprising a homothetic transformation having a ratio with an absolute value different from 1.