| 摘要 |
PROBLEM TO BE SOLVED: To rate an inspected object on the basis of a minute defect that becomes a problem at the time of frequent occurrence.SOLUTION: A determination unit 17 executes the steps of: calculating a surface defect quantity in each unit area formed by dividing an inspected object 10 in longitudinal and width directions, on the basis of a type and level of surface defect; comparing the surface defect quantity with a defect quantity threshold and extracting a unit area with the surface defect quantity greater than the defect quantity threshold as a threshold exceeding area; determining whether or not a unit area adjacent in the longitudinal direction of the threshold exceeding area is the threshold exceeding area, with respect to each of the extracted threshold exceeding areas; extracting the threshold exceeding area as a longitudinally-sequential threshold exceeding area when the unit area adjacent in the longitudinal direction of the threshold exceeding area is the threshold exceeding area; calculating the number of longitudinally-sequential threshold exceeding areas in the inspected object 10; and rating the inspected object 10 on the basis of the calculated number of longitudinally-sequential threshold exceeding areas. |
