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

％ Program file "elliptica.m" ％ calculates and displays tip of electric ％ field vector of elliptically polarized ％ EM wave traveling along z axis.- Program file elliptica.m calculates and displays tip of electric field vector of elliptically p