When inspecting glass you need background lighting where light & shadow are composed to precisely enhance the type of defect you want to highlight. This is usually done by transporting the parts on a conveyor where different light boxes and cameras are placed at intervals. Each light box is marked with patterns that help to improve the contrast of cracks, blisters & knots, for example. Achieving this in a conventional system requires many cameras & light boxes & a lot of floor space. The numerous components reduce the reliability & the system requires more maintenance. In traditional illumination systems, these patterns are always a compromise as they may have to cover a wide range of products with different sizes & shapes. This article describes a new product from JLI Vision, the Dynamic Light Box, specifically made for tableware inspection.
