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

摘要

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.

主权项

1. A method of fast analysis of relief elements on an internal surface of a tyre, the method comprising steps of:
capturing a three-dimensional image of the internal surface of the tyre, each pixel (p(i,j)) of a plurality of pixels of the captured image corresponding to a topographical elevation of a point of the tyre; assigning to each pixel of the plurality of pixels of the captured image a greyscale value (g(p)) proportional to the topographical elevation of a corresponding point of the tyre, so as to obtain a starting image; transforming the starting image into an orthogonal reference frame (OXY) in which an abscissa axis (OX) represents a circumferential direction and an ordinate axis (OY) represents a radial direction; assigning to each pixel (p(x,y)) of a plurality of pixels of the transformed image an altitude gradient value (f(p)) by comparing an elevation of a point corresponding to a pixel being considered (p) with elevations of a number of points arranged on a straight line passing through the pixel being considered and oriented in the circumferential direction, wherein the number of points is between 1 and 4.