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Pierantonio Boriero, product line manager at Matrox Imaging, believes that further 3D software tools will aid setting up a 3D inspection system
I
ndustrial users of vision systems worldwide are becoming more comfortable
and confident with 3D imaging technology, as evidenced by the diverse application areas where it is now being used. Te 3D profiling technique, whereby a light beam projects onto an object under transverse motion, garners the most attention because it is relatively simple to put into practice. It delivers high measurement resolution and good measurement range, and its cost to implement is moderate. Matrox Imaging customers are using 3D profiling in automotive manufacturing, meat processing and logistics, to name just a few application areas. One customer identifies tyres by reading the embossed DOT code and other information found on them. 2D imaging alone struggles with this task because of the lack of contrast between the lettering/ numbering and the sidewall. 3D profiling is also being used to inspect the tyre construction. Other uses of 3D profiling in automotive manufacturing include engine block inspection and panel gap-and-flush verification. Another Matrox customer employs 3D profiling in butchering facilities to
size pieces of meat for optimised cutting. A courier company uses 3D profiling to check dimensions of parcels prior to shipment. Te 3D profiling technique,
The occlusion phenomenon can impede the successful deployment of a 3D profiling system
although established and proven, is undergoing continuous refinement, particularly on the soſtware side. Te occlusion phenomenon can impede the successful deployment of a 3D profiling system. Te use of multiple laser-camera pairs mitigates the issue but requires a more advanced calibration routine to obtain cohesive scanning results. 3D profiling produces a point cloud representation of an object. Te projection of this point cloud onto a reference plane in turn produces a depth map representation of an object lying on a flat surface. Oſten overlooked is the fact that a depth map can be processed and analysed using conventional 2D imaging tools to produce the desired inspection. Of course, the
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development of specific tools like 3D registration further facilitates setting up an inspection task. Matrox Imaging recognises the growing importance of 3D imaging as it works with users to augment and streamline the 3D capabilities within its Matrox Imaging Library (MIL).
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