Encoding-Assisted Temporal Direct Mode Decision for B Pictures in H.264/AVC
Yan-Neng Fang, Yinyi Lin, Hui-Jane Hsieh · 2013
This paper proposes an encoding-assisted temporal DIRECT mode decision algorithm for H.264/AVC inter bipredictive (B) frame video sequences to improve the coding efficiency.In the proposed algorithm, we employ motion vectors (MVs) of co-located block and its eight neighboring blocks for DIRECT mode decision.In addition, the weight selection for bidirectional prediction is also considered.The best MV and weight to minimize the sum of absolute prediction error is selected for DIRECT mode decision.The experimental results reveal that the proposed algorithm achieves average 0.1 dB PSNR gain or equivalently average 1.6% bit-rate reduction, compared to the conventional DIRECT mode coding that only uses the MV of the co-located MB for DIRECT mode decision.