Detection system and method suitably used on production line

A detecting method used on a production line, comprising:

• providing a plurality of detection printed circuit boards each having a bar code, and being moved by a conveying belt;
• providing a sensing device arranged on a fixed position, a belt vertically arranged on the belt, and an image acquiring device vertically arranged above the belt;
• providing a computing device, further comprising a contour library storing a standard contour picture and a corresponding bar code position of each of the plurality of printed circuit boards, and a detection drafting library storing the production serial number and a detection drafting;
• triggering a computation instruction to the computing device when the detecting device detects the detection print circuit board;
• computing an image acquisition time according to a fixed movement speed of the belt, a fixed distance between the sensing device and the image acquisition device and a half of a maximum length of the detection printed circuit board, when the computation receives the computation instruction;
• conversing the acquisition picture into a contour picture through a two-value process and an image restoration process to converse the acquisition picture into a contour picture;
• comparing the contour picture with each of the standard contour picture of each of the plurality of detection print circuit boards, to query the corresponding bar code position;
• producing an acquisition instruction according to the image acquisition time and providing the image acquisition time to the image acquisition device by the computing device, acquiring an acquisition picture comprising the detection printed circuit according to the acquisition instruction and providing the acquisition picture to the computing device;
• conversing the acquisition picture into a contour picture through a two-value process and an image restoration process by the computing device;
• comparing the contour picture with a standard contour picture of each of the detection printed circuit boards to query the corresponding bar code position by the computing device;
• moving to the corresponding barcode position on each of the plurality of detection printed circuit boards by the bar code reading device to read a product serial number of the bar code and providing the product serial number to the computing device;
• querying the detection drafting corresponding to the product serial number from the detection drafting library by the computing device;
• and
• optically detecting the detection printed circuit board through the image acquisition device by the computing device according to the detection drafting.