Simulation of Automated Visual Inspection Systems for Specular Surfaces Quality Control
This paper proposes the use of simulations as a design mechanism for visual inspection systems of specular surfaces. The system requirements and the characteristics of the objects involve a technological design problem for each of the solutions to be deve
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tract. This paper proposes the use of simulations as a design mechanism for visual inspection systems of specular surfaces. The system requirements and the characteristics of the objects involve a technological design problem for each of the solutions to be developed. A generic model is proposed. It may be adapted or particularised to solve specific inspection problems using simulations. The method results in a flexible low cost design, reducing the distance between the design model and system implementation in a manufacturing procedure. The proposed simulator generates model-based architectures. The paper shows the results on application of metallized automobile logos. Keywords: automated visual inspection, specular surfaces, simulation, quality control.
1 Introduction This paper presents the use of simulations in order to generate automatically vision systems, in particular, for the visual inspection of specular surfaces. This type of material shows optical difficulties due to have a high reflection coefficient. It causes undesirable reflections and shines that conceals chromatic and morphology information about the object. Most conventional methods of artificial vision proposed ignore the specular reflection characteristics of materials. They focus on surfaces whose reflection is essentially diffuse, arguing that it contains the object information. However, by making use of traditional techniques, methods have been developed with certain restrictions trying to identify the specular reflection component in order to separate it from the diffuse component [1][2]. Alternatively, specific methods have been developed that make the most of specular reflection to extract the shapes of objects [3][4][5][6][7]. Inspection of products with specular reflection is an open problem. Although some partial solutions have been provided, very few systems have been developed for addressing the automatic visual inspection of these objects. The solutions proposed make use of characteristics of active vision. Lighting of the scene is a determining *
This work was supported by the Spanish MCYT DPI2005-09215-C02-01.
D. Mery and L. Rueda (Eds.): PSIVT 2007, LNCS 4872, pp. 749–762, 2007. © Springer-Verlag Berlin Heidelberg 2007
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J.M. García-Chamizo, A. Fuster-Guilló, and J. Azorín-López
factor as it is possible to facilitate the detection of defects in images [8]. Structured lighting techniques are considered reliable and adequate for inspection of the surface shape and are presented in the few systems of the literature [9][10][11][12][13][14][15]. In addition, the use of the same sensor to determine reflectance is another argument for this type of technique (regularly it should be acquired in an independent manner). The systems differ according characteristics of the pattern: the acquisition of lighting pattern is acquired, through projection on the surface or the attention of the system on the reflection (considering the object as part of the optical system where lighting patterns are projected); the instruments used in generati
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