AVOIDING MATCH MARKS ON OBJETS FOR QUALITY CONTROL BY IMAGES

摘要

When facilities of images are used to control geometric quality of objets, these have to own match marks, which are reconstructed in 3D, if couples of 2D points of such marks on images are matched by a human or artificial recognition process. Particular applications may avoid match marking and human recognition, but it is necessary to locate objets with particular orientation in precise known places. On the other hand, precise location of objets into virtual reference systems, when those were located freely, is one characteristic of interest in many industrial applications. Some applications are: quick verification of quality by attributes, or navigation of robots, where marks would increase the work which is intended to avoid. This manuscript deal with mathematical possibilities, imaging techniques and computer graphics, to define position of objets and deviations of shape. Our techniques are based on the knowledge of design of objets, made with simple CAD primitives. An original methodology is used to overcome problems of occlusions or sudden discontinuities, ordinary presented in matching couples of images for stereo reconstruction.