| 摘要 |
PURPOSE:To enhance detection accuracy, by accurately confirming the position of an object to be inspected in order to inspect the appearance of the object to be inspected during movement and setting an accurate inspection region. CONSTITUTION:The image of a moving object to be inspected is photographed as a stationary image by a TV camera 2 and a stroboscope 3 and the image data digitized by an A/D converter part 9 is divided into two directions and one of them is stored in a frame memory 4 as the image corresponding to one picture and the other is inputted to a processing circuit 5 through a change- over device 6. Differentiation and thinning processings are performed in synchro nous relation to the clock signal of the camera 2 in the circuit 5 to send the thinning data to the first memory 7. After one picture is processed, the change- over device 6 is changed over from the memory 4 to the image and image data is again sent to the circuit in synchronous relation to the clock signal of the camera 2. Differentiation and thinning processings are performed in the circuit 5 in such a state that a threshold value is changed to send the thin ning data to the second memory 8. By performing the confirmation processing of a flaw part by CPU 13 using the thinning data obtained in the memories 7, 8, the detection reliability and accuracy of a flaw can be enhanced.
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