Patent ID: 10346970

Abstract:
An inspection method according to one aspect of the present disclosure, includes: acquiring a plurality of first acquisition images of a first die having a predetermined pattern; acquiring a plurality of second acquisition images of a second die having the predetermined pattern; acquiring a plurality of third acquisition images of a third die having the predetermined pattern; producing a first average image with the first acquisition images; producing a second average image with the second acquisition images: producing a third average image with the third acquisition images; producing a first comparative image with the first average image and the second average image; producing a second comparative image with the second average image and the third average image; producing a third comparative image with the first average image and the third average image; producing a reference image with the first acquisition images, the second acquisition images, and the third acquisition images; performing first comparison between the first comparative image and the reference image; performing second comparison between the second comparative image and the reference image; performing third comparison between the third comparative image and the reference image; determining, when a first defect is detected in the first comparison and the third comparison, that the first die has the first defect; determining, when a second defect is detected in the first comparison and the second comparison, that the second die has the second defect; and determining, when a third defect is detected in the second comparison and the third comparison, that the third die has the third defect.