摘要
针对基于DCT变换的视频压缩码流 ,该文提出了一种可有效改善其抗误码性能的收发交互不等纠错保护算法 .主要思想是在宏块层对不同数据信息进行位置重排 ,使DCT系数按重要性重新排列 ,然后通过EREC算法提高宏块头等同步信息的抗误码性能 .在信道编码部分 ,该算法依据译码端反馈的信道状态参数实时调整待传输的比特数和RCPC编码速率 ,从而实现收发交互的不等纠错保护 (IUEP) .仿真结果表明 ,该文算法在高误码率信道下能较大程度地改善解码PSNR值 ,其性能明显优于UEP、EEP等方法 .
In order to improve the robustness and error resilience of video streaming, a novel adaptive unequal error correction protection scheme based on VLC position rearrangement is proposed in this paper. The scheme partitions original data in MB layer and rearranges them according to respective different importance. Then EREC algorithm translates VLC bit streams into fix length packet structure. Furthermore, sender can adaptive adjust the transmitting bit rates and RCPC coding rates according to the feedback parameter, which is from receiver and reflects the current status of error-prone channel. The experimental results show that the proposed scheme can highly improve the quality of video communication and achieve better performance compared with conventional methods.
出处
《计算机学报》
EI
CSCD
北大核心
2004年第11期1546-1551,共6页
Chinese Journal of Computers
基金
国家自然科学基金 (60 3 72 0 43 )资助 .
关键词
位置重排
EREC
RCPC
不等纠错保护
宏块层
DCT变换
视频压缩码流
Adaptive algorithms
Bit error rate
Communication channels (information theory)
Computer simulation
Image coding
Signal to noise ratio
Wireless telecommunication systems
