光流场显示视频图像特征点，标出特征点其位移矢量-Optical flow field to display video image features，The displacement vector of feature points marked

光流算法是比较经典的运动估计方法，光流场反映了图像上每一点灰度的变化趋势-Optical flow algorithm is the classical motion estimation method, optical flow field reflects the change tendency of every point on the image grayscale