This system has implemented intelligent motion detection by utilizing a algorithm of difference image based on an automatically-updating background model.
利用背景自动更新模型的背景减法，实现了智能运动检测功能，并进行异常情况告警和启动告警录像；
It selects a threshold from a certain range to regard as one threshold which is the best threshold just as it makes the difference of stroke width in testing and model seal image minimum.
选定一定范围的灰度值作为可能的阈值，从中选出使待验章和样本章的笔划宽度相差最小时的阈值作为最佳阈值。
Identification algorithm mix difference image method and 4-connected boundary tracking method, besides, we improved the difference image method and built a new moving detection model finally.
识别算法采用差影法与4邻域连通区域标记相结合，并对差影法进行改进，建立起一个新型的运动检测模型。
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