NDLI: A general approach to flaw simulation in castings by superimposing projections of 3D models onto real X-ray images

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A general approach to flaw simulation in castings by superimposing projections of 3D models onto real X-ray images

Content Provider	Semantic Scholar
Author	Hahn, Dennis Mery, Domingo
Copyright Year	2003
Abstract	In order to evaluate the sensitivity of defect inspection systems, it is convenient to examine simulated data. This gives the possibility to tune the parameters of the inspection method and to test the performance of the system in critical cases. In this paper, a practical method for the simulation of defects in radioscopic images of aluminium castings is presented. The approach simulates only the flaws and not the whole radioscopic image of the object under test. A 3D mesh is used to model a flaw with complex geometry, which is projected and superimposed onto real radioscopic images of a homogeneous object according to the exponential attenuation law for Xrays. The new grey value of a pixel, where the 3D flaw is projected, depends only on four parameters: a) the grey value of the original X-ray image without flaw; b) the linear absorption coefficient of the examined material; c) the maximal thickness observable in the radioscopic image; and d) the length of the intersection of the 3D flaw with the modelled X-ray beam, that is projected into the pixel. A simulation of a complex flaw modelled as a 3D mesh can be performed in any position of the castings by using the algorithm described in this paper. This allows the evaluation of the performance of defect inspection systems in cases where the detection is known to be difficult. In this paper, we show experimental results on real X-ray images of aluminium wheels, in which 3D flaws like blowholes, cracks and inclusions are simulated.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.dgzfp.de/Portals/24/PDFs/Bbonline/BB_84-CD/pdfs/P%2004%20Hahn.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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