This paper presents the techniques used to inspect for defects on Surface Mount PCBs. Focusses were made on five different types of defects, namely, miss ing components, misalignment, wrong orientation of I.C. chips, wrong parts and poor solder joints. Thus five separate algorithms had been developed to detect these faults. The technique of windowing was employed to reduce the amount of redundant data to be processed. Preprocessing functions like convolution as well as all image processing tasks are performed on the window regions only, saving tremendously on computation time. Experimental results showed that these algorithms are reliable; fast and cost-effective.
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机译：本文介绍了用于检查表面安装PCB上缺陷的技术。重点是五种不同类型的缺陷，即，Miss，Miss Ing Components，Missalignment，I.C的错误取向。芯片，错误的零件和可怜的焊点。因此，已经开发出五种单独的算法来检测这些故障。采用窗口技术来减少要处理的冗余数据量。预处理功能，如卷积以及所有图像处理任务仅在窗口区域上执行，在计算时省略卓越。实验结果表明，这些算法可靠;快速且经济效益。
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