A method of accurately determining the location of dots of sensed image data amongst an array of dots of image data in a fault tolerant manner, said data stored at a high pitch rate on a card and subject to rotations, warping and marking effects, said method comprising the steps of:...http://www.google.de/patents/US6542645?utm_source=gb-gplus-sharePatent US6542645 - Adaptive tracking of dots in optical storage system using ink dots
