| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for acquiring hole data, even when a measuring object is a connecting tool having a head part and a washer, capable of acquiring highly accurate hole data.SOLUTION: The method for acquiring hole data includes the steps of: dividing a hole 8 extracted from a data group representing presence/absence of a surface of a joint member, into a plurality of fan-shaped parts 32 by radial straight lines, with a center of the hole 8 defined as a tentative central position 31; extracting data closest to the tentative central position in the data group in the respective divided fan-shaped parts; taking out any three points of the data in the respective fan-shaped parts and acquiring a plurality of circles passing through the three points; and extracting a circle 33 having a largest radius in circles, in which the number of data pieces contained in the acquired circles is within a noise allowance number, and acquiring the center of gravity of the circle as a central position of the hole. |
