Exploitable results
A complete prototype for visual inspection of ceramic tiles has been integrated and installed at the production plant; it has been used to carry out tests against real products in real environment conditions. A significant set of tile products has been identified and tested. Two set of techniques, a quick and a sophisticated one, have been tested. The quick one, suitable for real-time processing, obtained results comparable with human ones in uniformly coloured tiles and in some kind of textured tiles; it performed less reliably in pseudo-random textured tiles (marble like). The sophisticated approach, tested in laboratory, detected defects in all kinds of products examined, both in plain and in textured tiles. Excellent results have also been reached in colour grading, comparable with those of specialized operators but more time-invariant. The expert system has been implemented and partially tested. More extensive test will be possible only on the final product after an extensive training on line.
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