| 摘要 |
PURPOSE:To decide the extent of curvature of a filament leg by correcting the inclination of the upper thread leg of image data to parallel with an Y axis and setting standard windows for an upper and a lower filament leg part, and comparing detected area with the upper limit and lower limit of a standard value. CONSTITUTION:Image data on a filament coil 1 which falls naturally is obtained through a flash light emitting device 3, a camera 4, a photosensor 5, and an A/D converter 7 and stored in an image memory 12. An end detecting circuit 13 detects the tip of the upper filament leg of the coil 1 and another point to find the inclination of the upper filament leg of the coil 1 and then corrects the filament leg of the coil 1 to parallel with the Y axis. Then, standard windows W1 and W2 are set where filament legs are present when the filament legs of the coil 1 do not curve and the area of images in the W1 and W2 is calculates and when the area values are both smaller than the preset upper limit value and larger than the lower limit value, it is decided that an article is normal.
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