图像轮廓提取技术在ATM监控系统中的应用

Application of Image Contour Extraction Technique in ATM Monitor System

针对ATM张贴告示以及改动键盘、出钞口、插卡口等犯罪情形,采用改进的Laplace算子,结合轮廓点色差判别预处理、轮廓追踪、分区设定阈值图像处理技术,提取出ATM监控图像的清晰轮廓。通过监控图像轮廓与样本轮廓对比以及相连监控图像轮廓的对比,当相连监控图像轮廓差异大于设定值,且与样本轮廓的吻合度低于设定值时,及时向监控中心发出警报。该技术应用于实际ATM监控系统,方便了值守人员的监控,提高了ATM服务的安全性、可靠性。

According to the crime of placarding notice and altering keyboard, cash exit, card entrance, combined with image preprocessing, contour tracing and different thresholds are used in subareas. Improved Laplace operator is used to extract the contour of ATM monitor image. The contour of ATM monitor image and template, consecutive contours are compared. When the difference of consecutive contour is more than given value and the same contour with template is less than given value, an alarm can be sent to monitor center in time. The practical ATM monitor system applies this technology. It is convenient to the watch. It improves the security and reliability of service.