Method of monitoring appearance of surface of tyre

A technology of tires, images, applied in the field of operation of external or internal appearance, which can solve problems such as inability to determine convergence, inability to determine the elimination of local optima, the need for verbosity, etc.

Inactive Publication Date: 2012-12-26
MICHELIN & CO CIE GEN DES ESTAB MICHELIN +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, this method requiring a lengthy and expensive training phase has the disadvantage of not being able to determine the convergence of these successive iterations on the one hand and the elimination of local optima on the other hand

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  • Method of monitoring appearance of surface of tyre
  • Method of monitoring appearance of surface of tyre
  • Method of monitoring appearance of surface of tyre

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Embodiment Construction

[0051] The detection method according to the invention comprises two distinct steps capable of revealing the presence or absence of anomalies and which can be considered as a training phase and a detection step, during which the factorial space, the transformation function and A classifier for detecting said anomalies on the surface of any tire to be classified.

[0052] The training phase begins by selecting at least one tire that includes a given anomaly visible on its surface. Anomalies of this type may be, for example, molding defects, oil stains, deviations of prestressing wires or creep of the rubber under the reinforcement layer, impurities, etc. Then, a two-dimensional black and white image of the anomaly is generated.

[0053] As will be shown later, this training phase can be made more robust by generating a series of two-dimensional images of said anomalies present on a number of different tire surfaces.

[0054] It is entirely possible to realize the invention by...

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Abstract

Method of detecting an anomaly on the surface of a tyre comprising the following steps in the course of which: A - the image of a given anomaly present on the surface of at least one tyre is produced, B - a multivariate image of the said surface, in which each pixel is represented in the form of a pixel vector, is constructed, with the aid of a collection of filters, in a filter space, the components of each pixel vector having a value corresponding to the value of this pixel in the image transformed with the aid of each of the filters of said collection C - with the aid of a linear function, this multivariate image is transformed from the filter space into a spectral space of given dimension whose variables are the filters or combinations of filters of said collection, so as to form a spectral image, D - a classifier is constructed by determining, for this anomaly, those zones, representative of the spectral space, in which the points of the spectral image, of said anomaly transformed into said spectral space, lie in a statistically representative manner.

Description

technical field [0001] The present invention relates to the field of tire manufacturing and in particular to operations for monitoring the external or internal appearance of tires during or at the end of the manufacturing process, with the aim of determining the degree of conformity of the tire with respect to a monitoring reference with regard to the tire's built for use. Background technique [0002] The increase in computing power of computers allows, at constant cost, the development on an industrial scale of automatic monitoring means aimed notably at assisting the operator in charge of visual monitoring. These means rely heavily on image processing techniques whose performance in terms of speed of analysis and definition largely depends on the computing power used. [0003] A method for performing such processing generally comprises comparing a two-dimensional or preferably three-dimensional image of the tire surface to be inspected with a two-dimensional or preferabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T2207/30108G06T7/0004
Inventor G・努瓦耶
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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