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US 2016/0103079 A1Published application
Method for the surface inspection of long products and apparatus suitable for carrying out such a method
AssigneeCentro Sviluppo Materiali S.p.A.
InventorValerio MOROLI
Life of this patent
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Abstract
Disclosed are a method and apparatus for the surface inspection and detection of defects of long products by means of a combination of images of the same region of the long product. The images are taken under different lighting condition in order to reconstruct the shape of the surface and thus obtain information on the presence of defects.
Claims9
Method for inspecting surface and detecting defects of long products while they are subjected to working, comprising:
- lighting an annular portion of the long product surface by a plurality of illuminators, each one projecting light with a set angle with respect to line perpendicular to lightened surface;
- detecting reflexed images by a plurality of detectors having their main axis inclined with respect to said line with a second set angle;
- acquiring and processing said images by a computerized unit;
- and
- using a combination of images of the same region of the long product, said images being taken under different lighting conditions, in order to rebuilt shape of surface and thus obtaining information about presence of defects,
- wherein point defects generating an angle along the product running direction are made evident using an assembly of cameras which are transverse with respect to the product, and two or more lighting groups, some of which are provided before, and others after said cameras, and wherein defects are individuated comparing images obtained for the same product region under the different lighting conditions, shooting of the same region with different lighting conditions being taken at the same time exploiting color cameras and using illuminators with different wavelengths.
3 more elements
Apparatus for identifying surface defects of a long product while it is subjected to working, comprising:
- a plurality of illuminators, provided along the long product, each one projecting light according to a set angle with respect to line perpendicular to the lightened surface portion;
- a plurality of detectors, provided about the long product, with relevant main axis inclined with respect to said line according to a set angle, and
- a computerized unit for acquiring and processing said images,
- wherein lighting groups, emitting white light or light dedicated to a set wavelength, are provided in such a way to lighten according to subsequent different angles regions of long product, and are possibly singularly piloted to realize sequences of lighting conditions, and in that computerized unit for acquisition and processing of said images, to provide useful indications for recognizing surface defects on the basis of shape or luminous intensity variations, uses comparison between images obtained under different lighting conditions of the product.
1 more element
Dependencies are inferred from the claim text.