Global Patent Index - EP 2006804 A1

EP 2006804 A1 20081224 - Method for optical inspection of a matt surface and apparatus for applying this method

Title (en)

Method for optical inspection of a matt surface and apparatus for applying this method

Title (de)

Verfahren zur optischen Inspektion einer matten Oberfläche und Vorrichtung zum Durchführen dieses Verfahren

Title (fr)

Méthode d'inspection optique d'une surface matte et appareil pour la mise en oeuvre de cette méthode

Publication

EP 2006804 A1 20081224 (DE)

Application

EP 07075502 A 20070622

Priority

EP 07075502 A 20070622

Abstract (en)

The invention concerns a method for the optical inspection of a matt surface of an object, the surface having a random texture, for example a tile (11) to find cracks (12). Furthermore the invention relates to an apparatus which is equipped to run the said method. The method includes the following steps. In a first step digital images of the surface are created by an image sensor (K) whereby the surface is illuminated from different directions by light sources (B). In a second step sub-images of the regions of interest are created from the images. In a third step the cracks are detected in the sub-images by digital image processing, generating abnormality sub-charts showing the putative cracks. In a fourth step for each region of interest a joint abnormality chart is generated by fusion of the sub-charts and in a fifth step the cracks are detected in each of the joint abnormality charts of each region of interest.

IPC 8 full level

G06T 7/00 (2006.01); G01N 21/88 (2006.01)

CPC (source: EP US)

G01N 21/8806 (2013.01 - EP US); G01N 21/95 (2013.01 - EP US); G06T 7/0004 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA HR MK RS

DOCDB simple family (publication)

EP 2006804 A1 20081224; US 2010177191 A1 20100715; US 8189044 B2 20120529; WO 2009000689 A1 20081231

DOCDB simple family (application)

EP 07075502 A 20070622; EP 2008057550 W 20080616; US 66521008 A 20080616