Bi-Directional Deformable Block-based Motion Estimation for Frame Rate-up Conversion of 360-degree V

We propose a bi-directional deformable block-based motion-estimation algorithm to improve the accuracy of a motion prediction in a 360-degree video, used for motion compensated frame-rate up conversion (MC-FRUC). In our work, the block shapes are adaptively deformed to predict a motion based on the coordinate of the current block, considering the geometric property of the equi-rectangular projection of 360-degree videos. Experimental results demonstrate that the proposed technique can significantly improve the visual quality of the videos as compared to the conventional MC-FRUC.