关键词: H.264SVC, 层次间相关性, 率失真模型, 空域?时域码率分配

Abstract: A bit allocation algorithm on joint spatial-temporal (S-T) scalabilities layers is proposed for H.264 SVC. Taking account of the characteristic of SVC encoding procedure, a two-step model-based bit allocation scheme is developed. Along spatial/temporal scalability dimension in each step, the bit allocation issue is formulated as an optimization problem. Then, the rate and distortion (R-D) models for dependent spatial and temporal layers are derived separately, where the complicated inter-layer dependencies are sufficiently considered. Finally, using the Lagrange multiplier method, the proposed algorithm can be solved numerically with derived R-D models. Experimental results show that the new R-D models result in a highly efficient bit allocation scheme, which outperforms the JSVM benchmark by a significant margin, and the average coding gain achieves 1.22 dB.

Key words: H.264 SVC, layers dependency, rate-distortion models, spatial-temporal bit allocation