Patent ID: 9430841
Filing Date: 2016-08-30
CPC Classification: G06K,G06T

Claim Text:
1. A defect inspection method comprising the steps of: shooting the surface of an inspection object to obtain a shot image comprising pixels; scanning the shot image in each of a plurality of predetermined directions independently using a dedicated scanning filter for each direction, and assigning a high evaluation value to a pixel of the shot image for each of the plurality of scanning directions when the luminance of the pixel is higher than the luminances of first adjacent pixels located on both sides of the pixel in the scanning direction and, in addition, the luminance of each of second adjacent pixels, located on both sides of the pixel in a direction perpendicular to the scanning direction, is higher than the luminances of third adjacent pixels located on both sides of the second adjacent pixel in the scanning direction; selecting selection pixels based on the evaluation values of the pixels for each of the plurality of scanning directions; connecting the selection pixels for each of the plurality of scanning directions; and synthesizing the selection pixels of the predetermined scanning directions, and removing those pixels which do not meet the requirement for a predetermined shape from the selection pixels.