基于H.264的自适应可伸缩编码研究

Adaptive Scalable Video Coding Based on H.264

为了更好地适应网络及终端的多样性,本文针对基于H.264的可伸缩编码,提出了一种基于运动区域的自适应可伸缩编码的优化方案。该方案根据基本层的运动信息及编码模式自动提取图像的运动感兴趣区域,并以独立片的形式对其进行时间、空间和质量上的可伸缩编码,实现选择性增强。实验结果表明,该方案不仅能大幅降低编码复杂度,而且使增强层码流集中包含运动区域信息,从而提高运动区域的重建质量及整幅图像的主观质量。

To adapt the diversification of network and terminal devices better, an optimization scheme of scalable video coding was proposed with Motional Region of Interest （MROI） based on H.264. The motion information and coding mode in base layer were used to determine the MROI, and then the MROI was enhanced as one slice by scalable coding. Experimental results show that the proposed scheme can greatly decrease coding complexity and make the MROI information have a higher probability to be included in the truncated bit stream. Therefore, the scheme improves the reconstructed quality of the potential MROI and subjective quality of the whole image.