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samper

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samper last won the day on June 1 2015

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  1. samper

    Surface Defects Detection

    Hi Taylor, Maurice Pillet and Hugues Favreliere are leading a team on this topic now. There are working with industrial partners who are willing to identify and characterize geometric defects on surfaces (scratchs, ...). In http://www.symme-mesura.com you will find some (in french...) informations If you go to "ressources", you will find publications (phd -in french...- but also journal papers in english, much better for you). In researchgate.net there are some papers of our group such as: https://www.researchgate.net/publication/272566459_Extended_visual_appearance_texture_features https://www.researchgate.net/publication/260795860_Visual_quality_inspection_and_fine_anomalies https://www.researchgate.net/publication/234772289_PTMs_developments_for_the_appearance_control_on_high-added_value_surfaces But at this time, most of the developments have not been published. You can find our emails on our papers if you want exchange. We are not involved in cultural heritage yet but it is a very interesting research domain where we could use our devices. Serge
  2. samper

    Surface Defects Detection

    I am Serge Samper,I was the research director of Gaëtan Le Goïc who has developped this technology (begining with a previous classic RTI tech) in my lab. We have developped a scientific machine with specific calibration and hardware (I could not explain all our hardware here). Specific algorithms have been also developped. We have much better results than those obtained by a classic PTM analysis. Our method of decomposition of reflectance give a high level of accuracy. We are able to catch very small scratches (about 1/20 pixel). We are still working on this topic with a team in Annecy. There are 2 phd on this work now (plus the one of Gaëtan). Thus the expertise is deep, and answers can be also detailled. For example, 96 led is a lot if you know exactly what to see, but if not, is it so expensive? No! Thus it is possible to decrease it but why? For what? We had all those questions and some answers. There are lots of questions we can give answers. If the camera, the lenses... are well chosen a specific machine can be built and give good results. I could also explain how the data can be projected in an other space than visual one. It is of interest to analyse geometric slopes and curvatures for example... Solutions can be good or not by very small "details". Our actual research give some answers on discontinuities, cavities, excressences, impurities, scratches, scales and shape defects. For chemical defects, we should see (we are working on material detection). If you want to detect, I really think we can give you good answers. If you want to measure deep cracks... there are other solutions. But perhaps would it be of interest to identify where and after to measure? In Gaetan's PhD we gave answers on this problem. With our device, we measure 2 micron large scratches. It would be simple to test your surfaces. Serge
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