Analysis of the digital image of the external surface of a tyre and processing of false measurement points

An image and three-dimensional digital technology, applied in image analysis, image data processing, image enhancement, etc., can solve problems such as abnormal tire structure and disappearance of false measurement points

Inactive Publication Date: 2014-03-19
OCIETE DE TECH MICHELIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It has been observed, however, that images of surfaces produced from these acquisition devices may have spurious measurement points that must be identified and made disappear prior to subsequent digital processing
Otherwise, the analysis algorithm may incorrectly treat these areas as structural abnormalities of the tire being inspected

Method used

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  • Analysis of the digital image of the external surface of a tyre and processing of false measurement points
  • Analysis of the digital image of the external surface of a tyre and processing of false measurement points
  • Analysis of the digital image of the external surface of a tyre and processing of false measurement points

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Experimental program
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Embodiment Construction

[0028] figure 1 Acquisition of an image of the tire surface is shown. By way of example, this acquisition is performed by means of slit light emitted by the laser 1 and by means of a camera 3 capable of capturing a 2D image of the illuminated surface. The camera is positioned such that its aiming direction forms a given angle with the beam emitted by the laser source. By triangulation, the coordinates of the relief unit 2 relative to the support surface 4 can then be determined. Generally, the slit light is directed in an axial or radial direction perpendicular to the circumferential direction corresponding to the direction of rotation imposed on the tire to capture a complete image of its surface.

[0029] figure 2 The resulting image from this capture is shown. The presence of false measurement points, denoted FMP, was observed, the presence of false measurement points being especially noticeable on the edges of the tread undulations.

[0030] At each point (x,y) of t...

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Abstract

The invention relates to a method for processing the three-dimensional digital image of the surface of a tyre, in which the three-dimensional image of the surface is captured and each pixel of the plane of the image is assigned a datum relating to the elevation of this point in relation to the surface the height of which is to be inspected. The method is characterised in that, with the aid of a morphological operator using a structuring element, a first transformation of the surface is performed, by means of opening followed by closing, such as to adjust the grey scale of pixels located abnormally above or below the surface to be inspected.

Description

technical field [0001] The present invention relates to the field of tire manufacturing and more particularly to the field of automatic inspection of tire surfaces with the aim of establishing a diagnosis in compliance with pre-established references. Background technique [0002] One of the steps of this process consists in acquiring a three-dimensional image of the tire surface in a known manner. [0003] Acquisition of this image is carried out by means of means based on the principle of optical triangulation using, for example, a 2D sensor coupled to a light source of laser type. [0004] The topographic image of the tire surface is in fact a two-dimensional image called a grayscale image, where each point, i.e., each pixel (x,y) of the image, is associated with Values ​​between f(x,y) are associated. The grayscale values ​​may usefully be encoded on 8 or 16 bits for greater efficiency. The gray level represents the height of this point relative to the surface. For a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/30
CPCG06T5/30G06T5/002G06T3/0056G06T2207/30108G06T2207/20036G01N21/952G06T2207/30164G06T7/001G01M17/027G06T2207/10028
Inventor J-P·扎内拉C·莫罗G·努瓦耶尔Y·沈
Owner OCIETE DE TECH MICHELIN
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