Analysis of the digital image of the internal surface of a tyre and processing of false measurement points
First Claim
1. A method for processing an image of a surface of a tyre, the method comprising:
- digitally processing an acquired three-dimensional digital image of the surface by using a computer processor to;
for each point of the acquired image, assign a grey-level value level corresponding to an elevation of the point;
utilize a first morphological operator, which uses a rectangular key element, to perform a closure-type first transformation of the image of the surface;
utilize a second morphological operator, which uses a rectangular key element, to perform an opening-type second transformation of the surface; and
for each point of the image, assign a grey-level value equal to a minimum value between a grey-level value of grey level at that point in a preceding step after the second transformation and a grey-level value at that point of the image, so as to eliminate false measurement points,wherein a result of the processing of the acquired image is used to determine where the tyre is in compliance with a reference.
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Abstract
A method for processing an image of a surface of a tire under inspection is described. A three-dimensional digital image of the surface is captured and, for each point of the captured image, a grey-level value corresponding to an elevation is assigned to the point. Utilizing a first morphological operator that uses a rectangular key element, a closure-type first transformation of the image of the surface is carried out. Utilizing a second morphological operator that uses a rectangular key element, an opening-type second transformation of the surface is carried out. For each point of the image, a grey-level value equal to a minimum value between a grey-level value at that point obtained in a preceding step and a grey-level value at that point is assigned, so as to eliminate false measurement points.
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Citations
8 Claims
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1. A method for processing an image of a surface of a tyre, the method comprising:
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digitally processing an acquired three-dimensional digital image of the surface by using a computer processor to; for each point of the acquired image, assign a grey-level value level corresponding to an elevation of the point; utilize a first morphological operator, which uses a rectangular key element, to perform a closure-type first transformation of the image of the surface; utilize a second morphological operator, which uses a rectangular key element, to perform an opening-type second transformation of the surface; and for each point of the image, assign a grey-level value equal to a minimum value between a grey-level value of grey level at that point in a preceding step after the second transformation and a grey-level value at that point of the image, so as to eliminate false measurement points, wherein a result of the processing of the acquired image is used to determine where the tyre is in compliance with a reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification