Method for optical inspection of a matt surface and apparatus for applying this method
US8189044B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2008 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Jun 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/95
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method and apparatus 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), 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.