Method for examining doubtful zones on the surface of an...

G - Physics – 01 – N

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G01N 21/89 (2006.01)

Patent

CA 2284895

The invention concerns a method for examining the surface of an unwinding strip (10), to detect surface fault which consists in the following steps: forming at least a digital image of the strip (10), consisting of a set of image elements each with an assigned digital value; filtering the digital image to detect surface defects; and processing the filtered digital image to identify the type of surface fault in the strip (10). Previous to the digital image processing step, segmenting the digital image into doubtful zones each containing a surface defect, said image processing step being carried out on said doubtful zones.

Image Dans ce procédé d'inspection de surface d'une bande (10) en défilement, pour la détection de défaut de surface, on forme au moins une image numérique d'au moins une face de la bande (10), constituée d'un ensemble d'éléments d'image affectés chacun d'une valeur numérique, on filtre l'image numérique pour la détection d'irrégularités de surface, et on traite l'image numérique filtrée pour l'identification du type de défaut de surface de la bande (10). Préalablement à l'étape de traitement de l'image numérique, on segmente l'image numérique en zones suspectes contenant chacune une irrégularité de surface, ladite étape de traitement d'image étant effectuée sur lesdites zones suspectes.

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