High-grade plastic parts have to be inspected for surface defects before assembly. The quality standards in many industries such as the automotive, medical engineering or semiconductor industries require an automated, 100 % inspection rate with a fast cycle time. If plastics parts with surface defects are processed further, the defects will result in degradation of the part's function (e.g. displays). Particularly for high gloss or coated surfaces, the appearance of small esthetic defects is very annoying. Furthermore, such defects could cause complaints about the entire part production series and may consequently generate high costs.
The inspection is still often performed manually by an operator, which leads to non-reproducible measurements in addition to expenses.