A Novel Motion Field Anchoring Paradigm for Highly Scalable Wavelet-based Video Coding

Abstract

Existing video coders anchor motion fields at frames that are to be predicted. In this paper, we demonstrate how changing the anchoring of motion fields to reference frames has some important advantages over conventional anchoring. We work with piece-wise smooth motion fields, and use breakpoints to signal discontinuities at moving object boundaries. We show how discontinuity information can be used to resolve double mappings arising when motion is warped from reference to target frames. We present an analytical model that allows to determine weights for texture, motion, and breakpoints to guide the rate-allocation for scalable encoding. Compared to the conventional way of anchoring motion fields, the proposed scheme requires fewer bits for the coding of motion; furthermore, the reconstructed video frames contain fewer ghosting artefacts. Experimental results show superior performance compared to the traditional anchoring, and demonstrate the high scalability attributes of the proposed method.

References

[1] D. Ruefenacht, R. Mathew, and D. Taubman, “A Novel Motion Field Anchoring Paradigm for Highly Scalable Wavelet-based Video Coding,” IEEE Transactions on Image Processing (TIP), 2015.