Pirelli Tyre S.p.a.

Alessandro Ghidotti Piovan

Vincenzo Boffa

Valeriano Ballardini

Fabio Regoli

Luigi Di Stefano

Lara Vandini

Method and related apparatus for detecting defects on a surface of a tyre, comprising: providing the tyre (); acquiring a digital image comprising a structure comprising sections representative of linear elements of a pattern in a surface portion and representative of possible elongated defects, said sections of the structure having a respective orientation; providing a model of the pattern in the surface portion, wherein each pixel is associated with a first index representative of whether the pixel belongs or not to a pattern section and a second index representative of an at least local orientation of the pattern section passing through said pixel; calculating for each pixel of the structure a third index representative of the orientation of the structure section passing through said pixel; and establishing, for each pixel of the structure having a corresponding pixel in the pattern model belonging to the pattern, whether said pixel of the structure belongs to a proposed defect on the basis of the comparison between the third index and the second index associated with the corresponding pixel in the pattern model.

Method and apparatus for detecting defects on the surface of tyres

Method and related apparatus for analysing a surface of a tyre, includes: acquiring one or more digital images of a surface portion having a pattern that includes a scheme that is repeated substantially equal thereto in a plurality of positions; identifying a plurality of first regions of said one or more digital images, each corresponding to a respective scheme sub-portion; identifying a respective plurality of regions homologous to each first region, wherein the respective scheme sub-portion is substantially identical to the respective scheme sub-portion of each first region; calculating a model of the respective scheme sub-portion, where each pixel is associated with a mean value of the values associated with the pixels of each first region and of the respective homologous regions having the same relative coordinates of said each pixel; and obtaining a pattern model using the calculated scheme sub-portion models.

Method and apparatus for analyzing a surface of a tyre

Method and related apparatus for detecting defects on a surface of a tire, include: providing the tire; acquiring a digital image including a structure including sections representative of linear elements of a pattern in a surface portion and representative of possible elongated defects, the sections of the structure having a respective orientation; providing a model of the pattern in the surface portion, wherein each pixel is associated with a first index representative of whether the pixel belongs or not to a pattern section and a second index representative of an at least local orientation of the pattern section passing through the pixel; calculating for each pixel of the structure a third index representative of the orientation of the structure section passing through the pixel; and establishing, for each pixel of the structure having a corresponding pixel in the pattern model belonging to the pattern, whether the pixel of the structure belongs to a proposed defect on the basis of the comparison between the third index and the second index associated with the corresponding pixel in the pattern model.

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Imola, Italy

Alessandro Ghidotti Piovan