摘要
视频在易错信道中某一段码流的传输误差容易扩散到后续帧,导致视频质量大大降低。差错掩盖技术能够有效地隐藏出错的图像数据。H.264 SVC在保证高效的编码性能前提下支持完整的时域、空域和质量可分级特性,因此研究基于H.264 SVC的差错掩盖技术具有一定的理论意义和重要的实用价值。本文基于BLSKIP掩盖算法提出了一种改进算法,该算法根据视频基本层整帧丢失的情况,将改进的TD时域掩盖算法与BLSKIP算法相结合,动态地选择合适的差错掩盖处理,有效地提高了增强层的错误恢复能力。实验结果表明,与其他的SVC差错掩盖算法相比,本文的自适应差错掩盖算法无论在主观质量和客观质量方面都获得了改善。
In the error-prone channels,channel errors not only damage current frame,but also propagate the effect to the subsequent frames,which significantly degrade decoded video quality.Error concealment provides a effective solution to deal with the problem. H.264 SVC incorporates the functionalities of scalability of temporal,spatial and quality with good encoding performance.Therefore, the study on error concealment for H.264 SVC is a very important issue.In this paper,an improved algorithm is proposed on the basis of the BLSKIP algorithm.The new algorithm combines the improved temporal TD algorithm with the BLSKIP algorithm,and adaptively chooses the appropriate concealment mode to improve the error resilience for the enhancement layer based on the transmission status of the base layer.Experimental results show that,compare with othe known SVC error concealment algorithms,the proposed algorithm possess better subjective and objective quality.
出处
《信号处理》
CSCD
北大核心
2011年第11期1744-1748,共5页
Journal of Signal Processing
关键词
H.264
分级视频编码
差错掩盖
自适应
增强层
H.264
Scalable Video Coding
Error Concealment
mode selection
Enhancement Layer
