METHOD FOR IDENTIFYING AND DEFINING BASIC PATTERNS FORMING THE TREAD PATTERN OF A TYRE
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Accused Products
Abstract
A method for inspecting tyre tread, having circumferentially juxtaposed elements separated by identically shaped boundaries and having patterns arranged in a predetermined sequence, includes: acquiring an image of a surface of the tyre tread, the image including pixels associated with a light-intensity level; transforming the image by circumferentially offsetting pixels located axially at a same distance (x1, x2) from a given circumferential reference (OY), by an inverse (−y1, −y2) of a circumferential offset (y1, y2) with respect to an axial line (OX) of a point (P1, P2) located on a boundary line of known shape at the same axial distance (x1, x2) from the circumferential reference (OY), such that boundaries between elements appear as straight traces orientated in an axial direction; and analyzing the image to identify points located on an axially orientated straight line, the points being treated as points located on a boundary line between two elements.
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Citations
24 Claims
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1-12. -12. (canceled)
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13. An inspection method for inspecting tyre tread, which has a tread pattern that includes circumferentially juxtaposed elements separated from each other by boundaries of known shapes, and that includes basic patterns arranged in a predetermined sequence, the method comprising steps of:
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obtaining an image of a surface of a tyre tread to be inspected, the image being formed of pixels associated with a level of light intensity; transforming the image by circumferentially offsetting pixels of the image located axially at a same axial distance (x1, x2) from a given circumferential reference (OY) by an inverse (−
yr, −
y2) of a circumferential offset (y1, y2) with respect to an axial line (OX) of a point (P1, P2) located on a boundary line of known shape at the same axial distance (x1, x2) from the circumferential reference (OY), such that boundaries between elements appear as straight traces orientated in an axial direction; andanalyzing the image, using a contour-detecting filter, to identify points of the image located on an axially orientated straight line, the identified points representing points located on a boundary between two elements. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification