| 摘要 |
PURPOSE:To conduct a test at high accuracy by a simple device which makes its shift unnecessary by obtaining coordinates of at least one sheet end of an image picked up by lighting the joint of a sheet-like material at both sides of the joint. CONSTITUTION:The sheet 1 available from overlapping upper and lower sheets 1a and 1b is irradiated alternately by right and left light sources 3a and 3b of the joint. The image of the joint caused by the light source 3a is formed on a camera 2, stored in a frame memory 5a through a switch circuit SW4, and a window is set 6a. The luminous energy shading is corrected 7a and smoothed 8a, and a noise is removed to store the image in a frame memory 9a. Then after a picture signal is integrated 10a, coordinates of a density distribution in a direction intersecting orthogonally with the joint is detected 11a and inputted to a deciding circuit 12. The image caused by the light source 3b is processed in the same manner, and a smoothed 8b signal is subtracted 13 from the output of the frame memory 9a and then processed in the same way as the system of the light source 3a and inputted to the deciding circuit 12. Then the shift of the device can be unnecessary and the test can be conducted at high accuracy. |
