Optical flow is widely used for describing motion cues in the scene, but limited by slow estimating speed and illumination sensitivity. To handle both problems, this paper focuses on improving speed and accuracy of optical flow using RGB-D data and enhancing its robustness on motion description via fusing depth flow which is obtained only using depth data. First, salient motion regions (SMRs) are detected between depth frames which have good character on motion description for they all locate on moving objects. Then, depth flow is calculated to describe 3D motion for each SMR and directs fast orientation region growing on depth map. Thus larger motion regions are grown, and region-based optical flow estimation is conducted on grown regions. Estimation error is reduced and noise is inhibited due to depth constraints. Finally, a fusion scheme is adopted which combines depth flow and optical flow for better 3D motion description in the scene. Experiments on a RGB-D video data sets recorded in various complex scenes demonstrate the improved speed and robustness of the proposed method.
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