| 摘要 |
PURPOSE:To detect abnormality automatically and securely by counting picture elements perpendicular to a density gradient from an input image pickup image signal as to picture elements which are a specific value larger than the absolute value of a directional component having the density gradient in a constant direction, performing projection conversion, and comparing the evaluate value with a permissible error value. CONSTITUTION:A camera 2 is moved by a robot 1 to a specific position to picks up an image of an insulator 3 to be inspected and inputs its digital data to the image input means 4 of the appearance inspecting device 10 and a directional differentiating circuit 5 detects the density gradient of the insulator 3 in the fold direction to extract the directional component. As for the differentiated image, a projection data generating circuit 6 counts pictures parallel to the folds by positive and negative picture elements separately as to the picture elements whose absolute differential values are large than the specific threshold value. Projection data are regular when the insulator is normal, but irregular when not. The data are compared with the permissible error items stored in a storage means 9 and when an item is exceeded, an abnormal place is detected. |
