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Method of checking the appearance of the surface of a tyre

  • US 9,189,841 B2
  • Filed: 09/27/2012
  • Issued: 11/17/2015
  • Est. Priority Date: 09/30/2011
  • Status: Active Grant
First Claim
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1. A method of detecting an anomaly on an internal surface of a tyre through digital processing of an image of the internal surface of the tyre, the method comprising steps of:

  • capturing a grey-level original image (f) of the internal surface of the tyre and transforming the original grey-level image into an orthonormal space, in which an x-axis (OX) represents a circumferential direction, and in which a y-axis (OY) represents a radial direction;

    transforming the original grey-level image using a predetermined series of filters (F1f, F2f, . . . FLf), to obtain a multivariate original image;

    splitting the multivariate original image into multivariate sub-images (WFk), to obtain predefined tiling in the axial direction and the circumferential direction;

    transforming each of the multivariate sub-images is transformed into one-dimensional vectors using a given descriptor (H, G, . . . N), to obtain a simplified multivariate image (KWF, GWF . . . , HWF) formed from a collation of the vectors;

    reducing a number of dimensions of the simplified multivariate image data using a data analysis tool, to obtain a reduced factorial space; and

    ,in the reduced factorial space, evaluating a distribution of sub-images containing an anomaly in relation to a distribution of sub-images containing no anomaly, in order to assess a separating power of the given descriptor.

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