A method and apparatus for locating and measuring capillary indentation marks on wire bonded leads by creating a normalized, one-dimensional circumferential projection of a candidate center location in an image of a capillary indentation mark and detecting signals in the one-dimensional circumferential...http://www.google.de/patents/US5835622?utm_source=gb-gplus-sharePatent US5835622 - Method and apparatus to locate and measure capillary indentation marks on wire bonded leads 
