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 two images are compared pixel, allowing them to subtract the difference, and a relatively small value, but not necessarily, and 0 Comparison