Patent ID: 6947587
Filing Date: 2005-09-20
Classification: G01N,G06T

Abstract:
1. A method of inspecting patterns, comprising the steps of: picking up a first pattern formed on a substrate to produce a first image; storing the first image; picking up a second pattern that is also formed on the substrate so as to have naturally the same shape as the first pattern, thereby producing a second image; aligning the first image and the second image with an accuracy of one pixel unit; after the first image and the second image are aligned with an accuracy of one pixel unit, adjusting a brightness of at least one of the first image and the second image to match a brightness of the first image with a brightness of the second image for each pixel; and comparing the first and second images aligned and matched in brightness to detect a defect of the patterns by using information of a scattered diagram of brightness of the first and second images.