A machine vision system for identifying the locations of bonding pads on an integrated circuit mounted in a lead frame. The system involves rotating the image of the die to produce an image of the die unrotated with respect to the lead frame (the "counter-rotated image"). The counter-rotated image...http://www.google.com/patents/US5754679?utm_source=gb-gplus-sharePatent US5754679 - Image rotating method for locating bond pads in an image
