Efficient motion field representation in the wavelet domain

It has been widely observed that improved motion field representation (e.g. fractional-pel and OBMC) is beneficial to video coding. In this paper, we investigate efficient motion field representation in the wavelet domain. We aim to demonstrate that motion estimation in the wavelet domain can: 1) effectively solve the occlusion problem; 2) transform the aperture from a problem into a property that can be exploited in video coding. Our study leads to a novel anisotropic motion field representation in the wavelet domain. Our new wavelet-based motion field offers more flexibility than traditional representations in the spatial domain and opens the door to an improved understanding of relationship between motion and intensity uncertainty model.