Camera - based object testing operation by means of shape - from - shading

摘要

A process for the camera - based testing of objects, in particular of casting - and forged parts, on the basis of the method of the shape - from - shading,the object to be checked is illuminated by at least one light source,wherein, by means of at least one camera at least a part of the illuminated by the light source part of the object is detected and the resulting image data are subjected to an image processing, which extends inside the image data of image regions (roi, regions of interest) selects and feeds it to a further processing,and wherein in the context of the further processing on the image regions, the method of the shape - from - shading is applied, in which a reconstruction of the object surface by the minimization of a cost function, which at least deviations between a real of a determined by the reconstruction of intensity over the surface which takes into account,in the case of the application of the method of shape - from - shading a reflectance function r of the surface of the object according to a series expansion is taken into account,in which case x = cos (θ) and c_i(α) and m_i(α) from the real..