Method for determining elements in relief on the surface of a tyre

Guillaume Noyel (1)

1 Société Michelin

A method of determining relief elements on a tire surface includes capturing a three-dimensional image of the surface and assigning to each pixel (i, j) of the image a grey-level value proportional to a topographic elevation of a point corresponding to the pixel, so as to obtain a starting image (ƒ). The method also includes transforming the starting image (ƒ) by a first top-hat operation, with aid of a first structuring element, so as to obtain an image (ƒ1) flattened by differencing, (ƒ1=ƒ—γ3,150(ƒ)). The method further includes performing a thresholding operation on the image flattened by differencing, so as to obtain a segmented image, (T<1,30>(ƒ1)=seg1) in which relief elements appear white on a black background.

Mots clés: Image processing; Industry; Image analysis; 3D surface segmentation; tyre inspection; Texture analysis; Mathematical morpholgy

Domaines: Vision par ordinateur et reconnaissance de formes [cs.CV]; Traitement du signal et de l'image [eess.SP]

Guillaume Noyel. Method for determining elements in relief on the surface of a tyre. United States, Patent n° : US9002130 (B2). 2015. ⟨hal-01374478⟩