Smooth motion vector resampling for standard compatible video post-processing
This paper presents a smooth motion vector resampling method that operates on a given motion vector field for video coding applications such as resolution change in transcoding or concealment of lost motion vectors. We formulate the motion resampling problem as an optimization problem, where the proposed algorithm obtains the optimal solution by minimizing a smoothness criteria imposed between adjacent motion vectors. The problem is formulated in the most general case, which enables us to explain some other resampling methods such as motion vector averaging, or linear interpolation as special cases. The simulation results show that the proposed algorithm can efficiently improve the visual quality of the video.