摘要
针对FGS(FineGranularityScalable)的等级码流结构存在的每个错误将导致大量接收到的位不能被解码的问题,首先通过利用UniversalVariableLengthCode(UVLC)优秀的自同步特性技术,将传输错误的影响进一步限制在一个或少数几个块;此外,将CodedBitPattern(CBP)的更高优先级的数据与在同一视频数据包中的DCT数据隔离开,并且放在每个视频数据包的开头以避免来自DCT系数的错误影响。试验结果表明:使用该种编码技术的精细可伸缩增强码流在定位、隔离错误和重同步方面有更强的能力,精细可伸缩增强层的可解码位的数量随着码率的上升而显著上升,同时解码后的视频质量在信噪比上也可以提高到0.6～0.8dB。
As to the problem that the bitstream structure of FGS(Fine Granularity Scalable) will cause a great amount of bits received undecodable, we first propose to use the Universal Variable Length Code (UVLC)technique to further limit the effects of transmission errors within one or only a few blocks by taking advantage of the excellent self-synchronization property of the UVLC.Furthermore, the higher priority data of Coded Bit Pattern (CBP)is separated from the DCT data in the same video packet and put in the beginning of each video packet to avoid the error impact from the DCT coefficients. The experimental results show that the FGS enhancement bitstream with the proposed coding techniques has greater capability in locating and isolating errors and resynchronization. The decodable bits of FGS enhancement layer increase significantly while the bit rate increases. Meanwhile, the decoded video quality can be improved up to 0.6dB～0.8dB in PSNR. '
出处
《计算机应用》
CSCD
北大核心
2003年第12期124-126,共3页
journal of Computer Applications
