Device and method for recognizing inscriptions on vehicle tires
First Claim
Patent Images
1. A device for recognizing an inscription on a tire of a vehicle, comprising;
- a driving surface plane;
at least one directional light source to illuminate the tire;
at least one camera to record an image sequence comprising multiple images of a wall of a tire rolling on the driving surface plane; and
a synthesizer configured to determine movement of local image areas between two arbitrary images of the image sequence using an algorithm and the knowledge that individual points on the wall of the tire move along a cycloid during the rolling thereby obtaining parameters of the corresponding cycloid movement for each image area; and
to synthesize, based on said parameters, a central image of the wall of the tire, in which all edges of the inscription are represented with high contrast, from the images of the image sequence, and to evaluate the synthesized central image with the aid of a text recognition method.
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Abstract
A device for recognizing the inscription on the wall of a tire, including a driving surface plane, at least one directional light source to illuminate the tire; at least one camera to record multiple images of a wall of the tire rolling on the driving surface plane; and an evaluation device to synthesize an image of the wall of the tire from the multiple recorded images and to evaluate the synthesized image with the aid of a text recognition method.
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Citations
9 Claims
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1. A device for recognizing an inscription on a tire of a vehicle, comprising;
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a driving surface plane; at least one directional light source to illuminate the tire; at least one camera to record an image sequence comprising multiple images of a wall of a tire rolling on the driving surface plane; and a synthesizer configured to determine movement of local image areas between two arbitrary images of the image sequence using an algorithm and the knowledge that individual points on the wall of the tire move along a cycloid during the rolling thereby obtaining parameters of the corresponding cycloid movement for each image area; and
to synthesize, based on said parameters, a central image of the wall of the tire, in which all edges of the inscription are represented with high contrast, from the images of the image sequence, and to evaluate the synthesized central image with the aid of a text recognition method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for recognizing an inscription on a wall of a tire, the method comprising:
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illuminating the tire with at least one directional light source; recording an image sequence comprising multiple images of the wall of the tire rolling as it passes by at least one camera; determining movement of local image areas between two arbitrary images of the image sequence using an algorithm and the knowledge that individual points on the wall of the tire move along a cycloid during the rolling thereby obtaining parameters of the corresponding cycloid movement for each image area; synthesizing, based on said parameters, a central image of the wall of the tire, in which all edges of the inscription are represented with high contrast, from the images of the image sequence; and evaluating the synthesized central image with the aid of a text recognition process.
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Specification