Patent ID: 6990743
Filing Date: 2006-01-31
Classification: H01J

Abstract:
1. A method of calibrating a measuring device, the method comprising the acts of: determining reference dimensional measurements of a shape based on a calibrated image of the shape; creating a reference mathematical representation of the shape based on the reference dimensional measurements, the reference mathematical representation comprising a plurality of reference equation terms, each of the plurality of reference equation terms relating to one of a plurality of image characteristics; determining current dimensional measurements of the shape based on a current image of the shape; creating a current mathematical representation of the shape based on the current dimensional measurements, the current mathematical representation comprising a plurality of current equation terms, each of the plurality of current equation terms relating to one of the plurality of image characteristics; comparing the plurality of current equation terms to the plurality of reference equation terms; and adjusting settings of the measuring device for certain image characteristics based on a difference between a one of the plurality of current equation terms and a one of the plurality of reference equation terms.