Patent ID: 7718912
Filing Date: 2010-05-18
Classification: G01N,G01R

Abstract:
1. An outer surface-inspecting method for judging whether a defect of a defective portion extracted from an inspection area in an image of an object to be inspected through comparison with a template is acceptable or not, comprising: dividing the inspection area into a plurality of sections respectively in which threshold values of different acceptable numbers of defective pixels representing different acceptable levels; judging whether at least one extracted defective portion is located over plural sections having different acceptable levels or within a single section; comparing the threshold values of the plural sections with pixel numbers of the image and selecting the threshold value of the lowest acceptable number of defective pixels set in the plural sections when the at least one extracted defective portion is located over the plural sections; calculating a centroid of the at least one extracted defective portion and selecting the acceptable level of the single section on which the centroid is located when the at least one extracted defective portion is located within a single section; and judging whether the defect of the defective portion is acceptable or not based on the selected threshold value of the lowest acceptable number of defective pixels set in the sections.