| 视频编码中Lagrange乘子自适应调整算法 |
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| 引用本文： | 韩峥,唐昆,崔慧娟. 视频编码中Lagrange乘子自适应调整算法[J]. 清华大学学报(自然科学版), 2009, 0(10) |
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| 作者姓名： | 韩峥 唐昆 崔慧娟 |
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| 作者单位： | 清华大学电子工程系微波与数字通信技术国家重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(60572081) |
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| 摘 要： | 为改进视频编码算法的率失真性能,提出了一种应用于视频编码率失真优化算法中的Lagrange乘子自适应调整算法。该算法以信源数据的统计分布为理论基础,将视频编码序列的变换系数方差引入到Lagrange乘子的计算过程中来,使得Lagrange乘子的取值可以根据图像内容变化特性进行自适应的调整。实验结果证明,与传统的Lagrange乘子的取值算法相比,该算法可以取得更好的率失真性能,尤其应用在低码率的视频序列中效果更为明显,同等码率下可以将峰值信噪比提高0.1～0.2 dB。
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| 关 键 词： | 视频编码 率失真优化 Lagrange乘子 |
Adaptive Lagrange multiplier selection for H.264 |
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| HAN Zheng,TANG Kun,CUI Huijuan. Adaptive Lagrange multiplier selection for H.264[J]. Journal of Tsinghua University(Science and Technology), 2009, 0(10) |
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| Authors: | HAN Zheng TANG Kun CUI Huijuan |
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| Affiliation: | State Key Laboratory of Microwave and Digital Communication;Department of Electronic Engineering;Tsinghua University;Beijing 100084;China |
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| Abstract: | A Lagrange multiplier selection method was developed for video coding using the source data distribution to introduce the variance of the transformed residual coefficients into the rate and distortion model,so that the method is able to adaptively optimize the Lagrange multiplier for different types of videos.Tests show that the algorithm outperforms the reference algorithm for the video coding standard H.264,especially for videos with high rates.Simulations show a gain of up to 0.1-0.2 dB. |
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| Keywords: | video coding rate-distortion optimization Lagrange multiplier |
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