Estimation of non-planar rotation for video coding applications

This paper presents a new method for the estimation of non-planar rotations, i.e. rotations around axis parallel to the image plane, in the context of video compression applications. This method is based on a non planar rotation model which assumes that the moving objects have a planar surface. The proposed block-based motion estimation approach is performed between consecutive or non-consecutive images, which may contained large displacements, and aims at minimizing the motion compensation error. The efficiency of the method has been compared to the results obtained with the classical full search block matching approach. Experimental results have been done on real video sequences. These results show a significant gain in term of PSNR compared to the classical full search block matching approach, while the coding cost of the additional motion information is very low, which demonstrates the interest of the proposed rotation model in the context of motion compensation for video compression applications.