Registration mark detection using matched filtering

• Main Author: BLINCOE GREGORY M.,WISNESKI CURTIS J.,PERKINS MARK D.,SUESS KENNETH H
• Format: Patent
• Language: English
• Published: 17.01.2007
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; CALCULATING; COMPUTING; COUNTING; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HANDLING RECORD CARRIERS; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PHYSICS; PRESENTATION OF DATA; PROSTHESES; RECOGNITION OF DATA; RECORD CARRIERS; TREATMENT OR PROTECTION OF EYES OR EARS

A system and method for detecting a registration mark associated with an object which provides improved resolution between matching and non-matching inputs. The registration mark represents a binary code sequence. Upon detecting a sequence of bits with a sensor, the detected sequence is provided to a code matching filter, which compares the detected sequence with the binary code sequence and produces a detection signal. The code matching filter increases a value of the detection signal for each matching pair of compared bits, and decreases the value of the detection signal for each non-matching pair of compared bits. In this manner, a penalty is assessed for mismatches. This results in a filter output having a high amplitude in response to a matching input, and a low amplitude for non-matching inputs. The system may sample the detected sequence of bits in such a manner as to avoid potential edge timing problems.