针对目前工业领域对多层电路板缺陷检测高效高精度的要求,在工业计算机分层成像的基础上,设计了一种基于轮廓提取技术的多层电路板缺陷自动检测系统.通过随机Hough变换检测出电路板定位圆的圆心坐标,再对目标图与标准图进行几何配准.同时对电路板裸板中常见的缺陷类型进行分析和研究,采用轮廓提取算法进行缺陷分类,并对缺陷类型进行了相应的标记,解决了传统DR和自动光学检测技术AOI对多层电路板无法进行内部电路分析的问题.%The defect inspection system of multilayer printed circuit boards based on contour extraction is designed on the basis of industrial computer laminography. It meets the requirements of its high efficiency and high precision in industry field. The Hough transformation is used to detect the location of the circle center on the target picture, and then the target image is adjusted to the standard image with geometric registration.The defect types of PCB are discussed.The contour extraction with pattern recognition is applied to the positions and classes of the defects.It is difficult to get a full and accurate circuit image of every layer and the position of the defects using the DR method and AOI scanning methods.
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