计算机应用 ›› 2013, Vol. 33 ›› Issue (06): 1511-1514.DOI: 10.3724/SP.J.1087.2013.01511

• 网络与通信 • 上一篇    下一篇

针对H.264码率控制的初始量化参数选择算法

杨楷芳,公衍超   

  1. 西北工业大学 电子信息学院, 西安 710129
  • 收稿日期:2012-12-12 修回日期:2013-02-05 出版日期:2013-06-01 发布日期:2013-06-05
  • 通讯作者: 杨楷芳
  • 作者简介:杨楷芳(1987-),女,山西阳泉人,博士研究生,主要研究方向:视频编码、码率控制;公衍超(1986-),男,山东临沂人,博士研究生,主要研究方向:视频编码、视觉感知。
  • 基金资助:

    教育部博士点基金资助项目(20096102120032);西北工业大学研究生创业种子基金资助项目(z2012093)

Initial quantization parameter selection algorithm of rate control for H.264

YANG Kaifang,GONG Yanchao   

  1. School of Electronics and Information, Northwestern Polytechnical University, Xi’an Shaanxi 710129, China
  • Received:2012-12-12 Revised:2013-02-05 Online:2013-06-05 Published:2013-06-01
  • Contact: YANG Kaifang

摘要: 针对JVT-H017提案码率控制算法初始量化参数选择与视频内容无关的问题,在总结现有改进算法基础上,提出一种快速有效的初始量化参数选择算法。该算法只需第一个P帧的平均绝对误差(MAD)值及每像素平均比特率信息即可快速给出初始量化参数。实验结果表明,在恒定比特率下,所提算法与JVT-H017算法相比,预测的初始量化参数更加准确,ΔPSNR最大能提高1.1dB,并且算法对含B帧编码结构同样有效。

关键词: 视频编码, 码率控制, 目标比特, 初始量化参数, JVT-H017

Abstract: As for the problem that initial Quantization Parameter (QP) selection of rate control in JVT-H017 has nothing to do with the video content, this paper analyzed the existing improved algorithms and puts forward a fast and effective initial quantization parameter selection algorithm. After obtaining the Mean Absolute Difference (MAD) of the first P frame and average bits per pixel, the proposed algorithm can calculate an appropriate initial quantization parameter. The experimental results show that compared with JVT-H017 under constant bit rate, the predicted initial quantization parameter is more accurate, and greatly improves the performance of rate control. The maximum performance gain in ΔPSNR is up to 1.1dB and works well when it contains the B frames.

Key words: video coding, rate control, target bit, initial quantization parameter, JVT-H017

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