Method for examining an unwinding strip surface by...

G - Physics – 01 – N

Patent

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G01N 21/89 (2006.01)

Patent

CA 2284894

The invention concerns a method for examining an unwinding strip surface consisting in the following steps: forming with imaging means at least a digital image of at least one strip (10) surface; filtering said at least one digital image to detect surface defects and processing said at least one filtered digital image to identify the type of surface defect corresponding to each detected defect. Previous to the digital image processing, characterising the defects by determining for each of them the value of predetermined parameters characteristic of surface defects and carrying out said defect pre-classification, based on predetermined values of said parameters, according to a set of predefined classes, said processing step being carried out on each class.

Dans ce procédé d'inspection de surface d'une bande en défilement, on forme, à l'aide de moyens de prise de vues, au moins une image numérique d'au moins une des faces de la bande (10), on filtre ladite au moins une image numérique pour la détection d'irrégularités de surface et l'on traite ladite au moins une image numérique filtrée pour l'identification du type de défaut de surface correspondant à chaque irrégularité détectée. Préalablement à l'étape de traitement des images numériques, on caractérise les irrégularités en déterminant pour chacune d'elles la valeur de paramètres, prédéterminés caractéristiques de défauts de surface et l'on effectue une classification préalable des irrégularités, à partir des valeurs déterminées desdits paramètres, selon un ensemble de classes prédéfinies, ladite étape de traitement étant effectuée sur chaque classe.

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