计算感兴趣区域内的光流特征，建立加权方向直方图，根据直方图统计感兴趣区域的主运方向和速度幅值。读取视频流，得到一段时间内运动目标的速度大小和方向变化。-Optical flow characteristics within the region of interest is calculated, and establish a weighted direction histogram, according to the master of the histogram region of interest transported direction and velocity amplitude. The changes in the size and direction of the video stream is read, and the speed of the moving target in the period of time.