Locating curvilinear objects using feathered fiducials
Patent 5500906 Issued on March 19, 1996. Estimated Expiration Date: 
January 14, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 14, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAligning method High speed optical inspection system Automatic accurate alignment system Automatic detection of elliptical shapes Inspection method using unique templates and histogram analysis Patent #: 5204911 InventorsAssigneeApplicationNo. 181328 filed on 01/14/1994US Classes:382/220, Calculating weighted similarity or difference (e.g., don`t-care areas)382/291Determining the position of an objectExaminersPrimary: Mancuso, JosephAssistant: Chang, Jon Attorney, Agent or FirmInternational ClassG06K 009/62AbstractA method and apparatus for locating curvilinear objects of variable scale in digitized images using feathered fiducials. The leathered fiducials are constructed by: defining a range of tolerated object size scale variations; generating an enlarged submodel within the range of tolerated scale variations and assigning background pixel values exterior to the enlarged submodel; generating a reduced size submodel within the range of tolerated scale variations and assigning foreground pixel values to the reduced size submodel; disposing the reduced size submodel within and tangent to the enlarged submodel at the application point; uniformly changing grey scale pixel values in a graduated manner from foreground to background between the reduced size submodel and the enlarged one. The curvilinear objects are then located by conducting searches using the constructed fiducials.Other References
Field of SearchDetermining the position of an objectTemplate matching (e.g., specific devices that determine the best match) Correlation Alignment, registration, or position determination Electronic template Comparator Calculating weighted similarity or difference (e.g., don`t-care areas) Electronic circuit chip or board (e.g., positioning) Position detection Alignment or positioning With two images of single article compared With light detector (e.g., photocell) With registration indicia (e.g., scale) FIDUCIAL INSTRUMENTS Artificial reference | |
