北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2008, Vol. 31 ›› Issue (6): 99-103.doi: 10.13190/jbupt.200806.99.wanghy

• 研究报告 • 上一篇    下一篇

I帧QP设置算法及其在场景变换中的应用

王海婴, 张新发   

  1. ( 北京邮电大学 信息与通信工程学院, 北京 100876)
  • 收稿日期:2008-04-04 修回日期:2008-07-23 出版日期:2008-12-31 发布日期:2008-12-31
  • 通讯作者: 王海婴

An Improved QP Setting Algorithm of I Frame and Its Application in Scene Change

WANG Hai-ying , ZHANG Xin-fa   

  1. (School of Information and Communication Engineering , Beijing University of Posts and Telecommunications,
    Beijing 100876, China)
  • Received:2008-04-04 Revised:2008-07-23 Online:2008-12-31 Published:2008-12-31
  • Contact: WANG Hai-ying

摘要:

针对H.264标准,提出一种改进的I帧QP设置算法,以梯度算子来衡量I帧编码复杂度,并由此得到I帧的码率-量化(R-QP)模型. 仿真结果表明,改进算法在峰值信噪比(PSNR)性能和码率控制的准确度上均有所提高,能获得更为平滑的PSNR曲线图和视觉质量. 将此算法应用于场景变换时,跳帧数目大幅度减少,视频质量得到进一步提高.

关键词: 码率控制, 梯度, 场景变换

Abstract:

A new QP setting algorithm of I frame based on H.264 is proposed. The improved method establishes a rate-quantization(R-Q) model by using gradient-based picture complexity measure. Simulation shows that by using the proposed scheme, a better rate control accuracy and a higher PSNR gain will be achieved. When applied to scene change, the number of skipped frames will be significantly reduced and the overall subjective quality of the reconstructed video will be provided.

Key words: rate control, gradient, scene change

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