METHOD FOR IDENTIFYING AND DEFINING BASIC PATTERNS FORMING THE TREAD PATTERN OF A TYRE.
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Abstract
A tyre tread, having circumferentially juxtaposed elements separated from one another by identically shaped boundaries and having a least one basic pattern, is inspected by: producing an image of the tyre tread; identifying tread wear indicators on the image; grouping together sub-sets of the indicators according to the basic pattern(s) included in the indicators; determining a characteristic point of each of the sub-sets of the indicators; determining a sequence of distances by computing distances between the characteristics points of each of the sub-sets of the indicators; comparing and the sequence of distances with a known sequence of distances between characteristic points of the basic pattern(s) to confirm coincidence thereof; and projecting a shape of a boundary between elements of the tyre tread onto a surface to be inspected according to the known sequence of distances between characteristic points of the basic pattern(s).
11 Citations
23 Claims
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1-9. -9. (canceled)
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10. An inspection method for inspecting a tread of a tyre having a tread pattern formed of elements that are juxtaposed circumferentially and separated from one another by identically shaped boundaries, and having basic patterns in a number sequenced in a known manner, the basic patterns including a basic pattern on which tread wear indicators are placed that are associated a characteristic point of the basic pattern, the method comprising steps of:
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obtaining an image of a tyre tread to be inspected; identifying tread wear indicators present on the image; grouping together sub-sets of the tread wear indicators corresponding to a basic pattern that includes the tread wear indicators; determining characteristic points of elements of the sub-sets of the tread wear indicators; determining a sequence of distances by computing distances between the characteristic points of the elements of the sub-sets of the tread wear indicators; comparing the sequence of distances with a known sequence of distances between characteristic points of at least one basic pattern, and confirming a coincidence between the sequences; and projecting a shape of a boundary between elements of the at least one basic pattern onto a surface to be inspected according to the known sequence of distances between the characteristic points of the at least one basic pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification