METHOD FOR THE PRE-PROCESSING OF A THREE-DIMENSIONAL IMAGE OF THE SURFACE OF A TYRE USING SUCCESSIVE B-SPLINE DEFORMATIONS
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Abstract
A method for inspecting a tyre surface involves comparison with an image of a three-dimensional (“3D”) reference surface. The method includes: extracting contours of graphic elements of an image of a 3D profile of a tyre surface to be inspected; locating characteristic points on the image of the tyre surface, and pairing the characteristic points with corresponding reference characteristic points on the image of the reference surface; associating a first reset B-spline surface with the reference surface by associating the reference characteristic points of the image of the reference surface with control points of the first reset B-spline surface; and deforming the reference surface by moving the control points of the first reset B-spline surface so as to superpose the control points on the characteristic points of the tyre surface, in accordance with the reference characteristic points of the reference surface paired with the characteristic points of the tyre surface.
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Citations
20 Claims
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1-10. -10. (canceled)
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11. A method for inspecting a surface of a tyre by comparison with an image of a three-dimensional reference surface, the reference surface and the surface of the tyre including markings in relief, the method comprising steps of:
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obtaining an image of a three-dimensional profile of a tyre surface to be inspected; extracting, from the image of the tyre surface to be inspected, contours of graphic elements; locating characteristic points on the image of the tyre surface to be inspected, and pairing the characteristic points with corresponding reference characteristic points of the image of the reference surface so as to create a set of paired points; associating a first reset B-spline surface with the reference surface by associating the reference characteristic points of the reference surface with control points of the first reset B-spline surface; and deforming the image of the reference surface by moving the control points of the first reset B-spline surface associated with the reference characteristic points of the reference surface so as to superpose the control points of the first reset B-spline surface on the characteristic points of the image of the tyre surface to be inspected paired therewith. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An inspection apparatus for inspecting a surface of a tyre, the apparatus comprising:
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a memory storing digital data describing a reference surface of a tyre; a processor programmed to calculate algorithms of a program of a tyre inspection method, including; extracting, from an image of a three-dimensional profile of a tyre surface to be inspected, contours of graphic elements of the tyre surface to be inspected, locating characteristic points on the image of the tyre surface to be inspected, and pairing the characteristic points with corresponding reference characteristic points of the image of the reference surface so as to create a set of paired points, associating a B-spline surface with the reference surface by associating the reference characteristic points of the reference surface with control points of the B-spline surface, and deforming the image of the reference surface by moving the control points of the B-spline surface associated with the reference characteristic points of the reference surface so as to superpose the control points of the B-spline surface on the characteristic points of the image of the tyre surface to be inspected paired therewith.
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Specification