A real-time apparatus for detecting surface defects on a moving object under test comprises a high-frequency linear light source for generating linear light which is focused on a line position of the tested object, a linear CCD (charge coupled device) camera for scanning the line position and generating...http://www.google.co.uk/patents/US5274713?utm_source=gb-gplus-sharePatent US5274713 - Real-time apparatus for detecting surface defects on objects
