关键词: 光流估计, 人脸图像配准, 线性变换

Abstract: An iterative algorithm is proposed to solve optical flow problem，which defines a linear transformation of the pixels in the neighbourhood instead of translation.While the pixel intensity of the same object in the two frames is not equal，the algorithm can cope with it in a better way than other methods.It can tackle the problem of large translation flow by itself，rather than image pyramid method.The experiments show it can also be used for face registration.And it converges quickly in a certain variation of rotation，translation，scale or other linear transformation.

Key words: optical flow estimation, face image registration, linear transformation