Method of inspecting articles
US5495535A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1993 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Sep 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/95615
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of inspecting an article with respect to a stored list of reference features by scanning the article to detect online features, transforming their coordinates according to registration transformation parameters to correct for misregistration of the article, and comparing 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 and the coordinates of the stored reference features.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.