A region matching variational optical flow algorithm based on image local structure according to the computing accuracy and robustness of the variational optical flow method is proposed.Firstly

the data term of the optical flow estimation energy function combines the constancy of the image structure and constancy of the grey value

which introduces a penalty function to ensure the good accuracy and robustness of the optical flow computing.Secondly

the smoothing term uses an adaptive nonlinear diffusion function which related to the image structure to preserve the boundaries of the motion.Finally

the region matching strategy and the coarse-to-fine method are used to compute the large displacement optical flow

and then the robustness and convergence are proved by mathematical method.Several experiments prove that the proposed algorithm has the better precisionand robustness even there are terrible illumination changes

complex motion of non-rigid object and large displacement of multiple objects.