Patent ID: 6687396
Filing Date: 2004-02-03
Classification: G01M

Abstract:
An optical member inspection apparatus, comprising:an image pick-up device which picks up an image of an inspection target optical member, and outputs image data representing said image of the inspection target optical member; an extraction processor which extracts, from the image data, a portion of the image having brightness different from other portions of the image, as an extracted object; a graphic feature value measuring processor which measures a graphic feature value of the extracted object; a position measuring processor which measures a position of the extracted object in the image data relative to an optical axis of said inspection target optical member; a normalization processor which normalizes the graphic feature value using a reference based on the position of the extracted object such that the graphic feature value of the extracted object is weighted with a distance between the position of the extracted object and the optical axis of said inspection target optical member so that the graphic feature value becomes heavier as the distance decreases; and an operation processor which calculates an evaluation function based on all normalized values calculated by the normalization processor for all extracted objects extracted from the image data by the extraction processor.