Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Dominique Jeulin

Michel Bilodeau

Guillaume Noyel

Estelle Parra-Denis

Vincent Arvis

A method for detecting a defect on a surface of a tire includes automated steps of: calculating values of a gradient of a plurality of texture parameters from an image of the surface of the tire, determining an image of the gradient, and thresholding of the image of the gradient to obtain a thresholded image.

Method for detecting a defect on a surface of a tire

In a method of fast analysis of relief elements featuring on an inner surface of a tire, a three-dimensional image of the surface is captured, and each pixel of the image is assigned a greyscale value proportional to a topographical elevation of a point corresponding to the pixel, so as to obtain a starting image. The image is transformed into an orthogonal reference frame (OXY) in which an abscissa axis (OX) represents circumferential values and an ordinate axis (OY) represents radial values. Each point of the surface, i.e., each pixel, is assigned an altitude gradient value (f(p)) by comparing an elevation of the point with an elevation of a discrete and reduced number of points arranged on a straight line passing through a pixel being considered (p) and oriented in a circumferential direction.

Method of fast analysis of the relief elements featuring on the internal surface of a tyre

A tire appearance detection method includes:

Growing community of inventors

Fontainebleau, France

Dominique Jeulin