PCB surface detection method based on a contour out-of-tolerance algorithm

• Main Authors: ZHANG MEIJIE, ZHANG LU, HU XIAOQIANG, ZHANG PENGZHONG
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS

The invention provides a PCB surface detection method based on a contour out-of-tolerance algorithm, and the method comprises the steps: firstly obtaining a PCB bare board template image, then carrying out the processing of the collected image, obtaining a test image, carrying out the template matching of the test image and the template image in place, and finally searching the defects of the testimage through employing the contour out-of-tolerance algorithm. By means of the outline out-of-tolerance method, defects on the PCB can be found in the 360-degree outline direction of the copper surface of the PCB, and limitation of the outline shape is avoided; Almost all PCB defects of open circuit, short circuit, damage, copper surface scratch, copper slag and the like on the PCB can be found;Compared with a traditional method for finding the defects of the PCB by using an image opening and closing operation combined method and other algorithms, the method is more accurate and wider in application range, and almos