Robust Variational Optical Flow Algorithm Based on Rolling Guided Filtering

Abstract

In order to solve the excessive smoothness caused by existing optical flow algorithms within motion edge regions of images under difficult scenes, such as noise, illumination changes and shadows, occlusion, large displacement, and non-rigid motion, a robust variational optical flow estimation model based on the rolling guidance filter has been proposed in this paper. Firstly, the rolling guidance filter strategy is presented, and the energy function of the rolling guidance filter is designed. Secondly, a non-local total variation with L1 norm (TV-Ll) optical flow computational model based on the rolling guidance filter is constructed. Finally, the energy function is converted into a linear minimization of the TV-Ll optical flow through the multi-resolution pyramid refinement, and the flow field is computed at each layer. The rolling guidance filter is used to optimize the optical flow estimation alternately. The MPI-Sintel and KITTI test sequences are employed to evaluate the proposed algorithm and other state-of-the-art methods, including total variation regularization of local-global optical flow (CLG- TV), classic model with non-local constraint (Classic+ NL), and nearest neighbor fields (NNF). The experimental results showed that the proposed algorithm, compared with other contrast methods, has a better edge protection effect in difficult scenes and motion forms, which effectively improves the accuracy and robustness of the optical flow estimation.