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引用本文：

任江涛,元辉,常义林,等.视频编码线性码率控制模型[J].电讯技术，2010，50（10）： - . [点击复制]
REN Jiang-tao,YUAN Hui,CHANG Yi-lin,et al.A Linear Rate Control Model for Video Coding[J].，2010，50（10）： - . [点击复制]

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视频编码线性码率控制模型
任江涛,元辉,常义林,任光亮
0 字体:加大+\|默认\|缩小-
(西安电子科技大学 ISN国家重点实验室，西安 710071)

摘要:

为提高视频编码码率控制的性能，通过理论推导及实验验证提出了一种新的视频编码码率控制模型。通过该模型，编码器可以直接确定量化参数(Quantization Parameter, QP) ,而不必计算量化步长(Quantization Step, Qstep),进而避免了由Qstep 确定QP 过程中的舍入误差，提高了码率控制的准确性。实验结果表明，与H.264/ AVC采用的码率控制方法相比，提出的模型可使跳帧发生的概率更低，恢复视频的质量更稳定，实际码率与目标码率之间的偏差更小,同时，还能获得更高的峰值信噪比。

关键词: 视频编码码率控制率失真模型量化参数峰值信噪比

DOI：

基金项目:国家自然科学基金资助项目(60772134)

A Linear Rate Control Model for Video Coding

REN Jiang-tao,YUAN Hui,CHANG Yi-lin,REN Guang-liang

(State Key Lab of ISN, Xidian University, Xi′an 710071,China)

Abstract:

In order to improve the performance of rate control, a linear rate con trol model is proposed through theoretical analysis and experiments. With the proposed model, the quantization parameter (QP) can be calculated directly whil e avoi ding the computation of quantization step (Qstep). Therefore, the ro und-off error producing by converting Qstep to QP, is avoided and t he coding rate can be controlled accurately. Experimental results show that comp ared with the rate control scheme utilized in H.264/AVC, the proposed model can make the probability of frame skip lower, the quality reconstructed more stab le, the mismatches between the actual coding bitrates and the target bitrate s smaller. At the same time,higher PSNR(Peak Signal to Noise Ratio) can be achieved.

Key words: rate control rate distortion model quantization parameter(QP) PSNR