对H.264中的多参考帧预测技术的评测

H.264标准支持多参考帧预测技术.为了考察这种基于多个前向参考帧的帧间运动补偿技术与编码效率的关系,我们分别调节前向参考帧、跳过帧和B帧数这几个关键参数,在它们取值的不同组合下进行了各种测试视频序列的编码实验.实验结果表明,多参考帧预测在绝大多数情况下不能改善编码效率,反而引入了繁重的计算开销.我们认为这是由于能体现多参考帧预测优势的视频序列的自相似性在实际应用中较为罕见,因此建议尽可能不使用多参考帧预测技术.

Investigation of Multi-Reference-Frame Prediction in H.264

H.264 supports a so-called multi-reference-frame prediction technique.We adjust its three relevant parameters (the number of previous reference frames,the number of skipped frames,and the number of B-frames),and use their different combinations to encode various test video sequences respectively.Experimental results show that multi-reference-frame prediction does not improve coding performance but involve heavy computing cost in most cases.We propose that the advantage of this technique depends on a sort of video content self-similarity,which seldom occurs in practice.We then suggest not to use the multi-reference-frame prediction technique in most applications.