Patent ID: 7398178

Claim:
An inspection equipment-implemented method of determining irregularities of an actual hole having an irregular circumference, comprising: scanning the actual hole having the irregular circumference formed in an object to obtain an area of the actual hole, wherein determining the area of the actual hole comprises setting a center coordinate of the actual hole, obtaining inner wall coordinates of the actual hole measured from the center coordinate of the actual hole, and determining the area of the actual hole based on the inner wall coordinates of the actual hole, and wherein determining the area of the actual hole further comprises drawing lines from the center coordinate of the actual hole to the inner wall coordinates of the actual hole to segment the actual hole into a plurality of triangles; determining a radius and a center of a virtual hole that has a regular circumference, based on the area of the actual hole; and obtaining the irregularities of the actual hole by determining a standard deviation of the circumference of the actual hole relative to the radius of the virtual hole to output whether the irregularities of the actual hole are within a critical irregularity.