| 摘要 |
PROBLEM TO BE SOLVED: To provide a visual inspection method having high inspection processing speed. SOLUTION: This visual inspection method is provided with a means (a) of providing image data prepared by picking up the image of an object to be inspected, a means (b) of finding brightness of each of plural image units forming the image data based on the image data, a means (c) of finding the number of the image unit which have the same brightness each other for every brightness, a means (d) of finding the maximum number na among those plural numbers found for each brightness level as an actually measured maximum number, a means (e) of computing by using the actually measured maximum number and finding the set maximum number n'a as a result of the computation, a means (f) of finding the threshold level of the brightness level, based on the maximum number set, a means (g) of binarizing the image data based on the threshold level, and a means (h) of detecting defect of the object to be inspected, based on the binarized image data. |
