比较了目前分布式视频系统的各种码率估计算法性能,并提出了改进的码率估计算法。
With a comparison on a few of rate estimation algorithms, an improved methods resided in the decoder is proposed in this paper.
试验结果证明,该算法能够将计算复杂度降低到快速全搜索运动估计算法的3%,而PSNR和码率几乎与快速全搜索算法得到的结果相当。
Experimental results show that our algorithm can reduce the computational-complexity to 3% of fast full search motion estimation algorithm, with negligible PSNR loss and bit rate increase.
运动矢量的预测是视频编码技术中的一个重要组成部分,它直接关系到运动估计的精度和码率大小。
Motion Vector prediction forms a key part of video coding technique in that it directly affects the bitrate and performance of motion estimation.
系统误码率(BER)的分析显示干扰估计接收机系统的性能要优于传统的接收机系统。
The analysis of bit error rate (BER) indicates that the system with interference estimate receiver has advantage over traditional system.
为了实现甚低码率下的透明质量语音编码,提出了一种基音周期估计算法。
A kind of robust pitch estimation algorithm is presented for parametric speech coding with transparent quality at very low bit rate.
本论文研究了MPEG - 4标准,在实现MPEG - 4视频编解码器软件原型的基础上,重点研究了编码过程中的两项关键技术:运动估计和码率控制。
This paper research the MPEG-4 standard and realize the software prototype of the MPEG-4 video codec. The paper emphasize two key techniques in MPEG-4 encoder: Motion Estimation and Bit Rate Control.
结果表明,用该算法可以精确估计载波相位和频差,有效地降低系统的误码率。
The simulation for QPSK shows that the algorithm can estimate the carrier phase and frequency offset accurately and reduce the system BER effectively.
由于AFEC码率的动态特性使业务实际的传输速率具有不固定性,因此估计有效带宽时要考虑AFEC的影响。
Due to the dynamic code rate of AFEC, its effect would be taken into account in estimating the effective bandwidth.
运动矢量修正技术:码率调整型转码算法可以屏蔽网络的异构性,但导致参考帧数据发生变化,需要重新进行运动估计。
Motion Vector Refinement: Bit rate adaptation transcoding adapt the network heterogeneity, which makes the reference frame changed. The motion estimation is needed.
本发明提高了大时延高误码率的卫星网络上的链路带宽估计的准确性。
The invention promotes estimation accuracy for link bandwidth of large time delay high error code rate satellite network.
从理论上分析了该算法所能达到的信道估计误差下限和比特误码率下限,并提出了最优叠加导频序列的设计准则。
Theoretical results of the lower bound of the bit error rate as well as the channel estimation error of the proposed algorithm were given.
从理论上分析了该算法所能达到的信道估计误差下限和比特误码率下限,并提出了最优叠加导频序列的设计准则。
Theoretical results of the lower bound of the bit error rate as well as the channel estimation error of the proposed algorithm were given.
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