Visible detection method of welding quality of circuit board based on support vector machine

Abstract

The invention discloses a visible detection method of the welding quality of a circuit board based on a support vector machine, which comprises the following steps: (1) acquiring an image of a weldingpart of the circuit board; (2) extracting a gray histogram of the welding image; (3) adopting an entropy-based image segmentation method to divide the welding image into three chroma strips; (4) taking three variables of area, barycentric ordinate and secondary moment from each chroma strip as characteristic quantities of the welding quality detection of the circuit board; and (5) taking the characteristic quantities as inputs of a support vector machine classifier, judging that the welding quality belongs to normal soldering, excessive soldering or insufficient soldering by three output values of the support vector machine classifier, and finally obtaining a welding quality result. The invention can overcome the problems of low manual detection efficiency, slow speed, low precision, highomission ratio, easy fatigue of detection personnel, and the like, and improves the automation degree of electronic manufacturing and production as well as the product quality.

Description

technical field [0001] The invention mainly relates to visual detection in the field of electronic manufacturing, in particular to a visual detection method for circuit board welding quality based on a support vector machine. Background technique [0002] In the electronic manufacturing production line, the production of circuit boards needs to go through many processes, and one of the key links is the inspection and testing of the quality of circuit boards. An important part of circuit board inspection and testing is the inspection of the soldering quality of electronic components, mainly to detect whether there are unqualified conditions such as missing soldering, excessive soldering tin, and insufficient soldering in each electronic component during the soldering process. In the existing quality inspection of circuit board soldering, manual inspection is often performed, which is not efficient, and it is difficult to guarantee the quality of inspection. With the developm...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a visual detection method for circuit board welding quality based on support vector machines, to overcome the shortcomings of manual detection, such as low efficiency, slow speed, low precision, high missed detection rate, and easy fatigue of detection personnel. , digital cameras and other equipment to achieve visual inspection of circuit board welding quality, thereby improving the automation of electronic manufacturing and product quality

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