METHOD OF INSPECTING ARTICLES

• Main Authors: SMILANSKY, ZEEV, HAREL, EYAL, NISSIM, MOSHE
• Format: Patent
• Language: English
• Published: 20.07.1994
• Edition: 5
• Subjects: CALCULATING; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; HANDLING RECORD CARRIERS; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRESENTATION OF DATA; PRINTED CIRCUITS; RECOGNITION OF DATA; RECORD CARRIERS; TESTING

A method of inspecting an article (1) with respect to a stored list of reference features (6) by scanning the article to detect online features (5), transforming their coordinates according to registration transformation parameters to correct for misregistration of the article, and comparing (7) the transformed coordinates of the online features with those of the stored reference features for matches. According to this method, an initial estimate of the required registration transformation parameters is provided and is dynamically improved by continuously computing and periodically updating the estimate from the coordinates of the online features detected during the scanning of the article (1) and the coordinates of the stored reference features (6).