用帧差分可以检测场景变化，一个简单帧差分可通过计算两个连续帧的象素获得。对帧内每个象素点（x,y），T时刻与T－1时刻象素值之差为Dx,y(T)=||Sx,y(T) – Sx,y(T-1)||。设定内帧差分系数IDsum=ΣL , IF ||Sx,y(T) – Sx,y(T-1)||≥Ta THEN L=TRUE，实际决定是否报警,可以通过计算三帧以上IDsum数量-Frame difference can be detected with the scene changes, a simple

由于光线的影响,两帧图象中的物体无运动,但灰度稍微有变化,这种情况也会影响检测的准确度,所以对两帧图象的象素点进行比较时,可以让它们相减的差值和某个小的数值比较,而不一定就是和0值比较-As the effect of light, two images of an object without moving, but the gray has changed slightly, this will also affect the accuracy of detection, so the tw

基于视频图像处理提取夜间交通车辆完整轮廓的方法．通过梯度滤波消除路面反光的干扰，然后对经过预处理的相邻视频帧图像实行三帧差分分割运动区域。-Based on video image processing to extract the entire outline of the vehicle nighttime traffic methods. Reflective pavement through gradient filter to eliminate the interference, a