本文选用了背景减法、帧间差分法和光流法。背景减法是通过将当前帧与背景帧相减得出灰度差值并将此差值与阈值比较判断是否有运动目标。-This paper chose the background subtraction and fr a me difference method and optical flow method.Background subtraction is through to the current fr a me and background fr a me subtract