BIDIRECTIONAL SCALABLE MOTION FOR SCALABLE VIDEO CODING

Motion information scalability is an important requirement for a fully scalable video codec, especially in low bit rate or small res-olution decoding scenarios, for which the fully scalable motion model (SMM) has been proposed. SMM can collaborate flawlessly with other scalabilities, such as spatial, temporal and quality, in a scalable video codec and it performs better than nonscalable motion model. To further improve the SMM, this paper further extends the algorithm to support hierarchical B frame structure and bidirectional or multidirectional motion estimation and, moreover, provides the corresponding rate distortion optimized estimation. Several simulation results are presented to verify the improveme-nts of this extension. Index Terms — Rate distortion optimization (RDO) motion estimation, bidirectional scalable motion, scalable video coding (SVC)