A product gauge is disclosed for use in the optical inspection of products. The product gauge can be produced from the image of a model of the product. The product gauge can also be electronically constructed on a video screen by a computer line-drawing program. The product gauge aids in the alignment...http://www.google.com.hk/patents/US5353356?utm_source=gb-gplus-share專利 US5353356 - Product gauge methods and apparatus for use in the optical determination of the acceptability of products
