| 摘要 |
PROBLEM TO BE SOLVED: To provide a check method which stably discriminates between good articles and defective articles in accordance with a reference image and a check image picked up in the same photographing condition even with respect to characters or patterns existing on the surface of a check object like industrial parts. SOLUTION: A sample to be a reference of good articles is selected to acquire a reference image (101), and the check image of a check sample is acquired in the same manner (102), and a density difference picture between the reference image and the check image is obtained (103). Meanwhile, area division is performed by edge extraction of the reference image (104). A variation of residual variance of the residual to each threshold is calculated for each obtained area, and a maximum value of these variations is obtained (105). Based on the obtained maximum variation, it is discriminated whether the check sample is good or not (106). |
