计算机工程 ›› 2012, Vol. 38 ›› Issue (06): 238-240.doi: 10.3969/j.issn.1000-3428.2012.06.079

• 多媒体技术及应用 • 上一篇    下一篇

一种改进的JVT-H017码率控制算法

丁 文,张浩平,胡鹏莎   

  1. (南京林业大学信息科学与技术学院,南京 210037)
  • 收稿日期:2011-06-20 出版日期:2012-03-20 发布日期:2012-03-20
  • 作者简介:丁 文(1986-),男,硕士研究生,主研方向:视频编码;张浩平,副教授;胡鹏莎,硕士研究生
  • 基金项目:
    国家自然科学基金资助项目(30671639);江苏省自然科学基金资助项目(BK2009393)

Improved JVT-H017 Code Rate Control Algorithm

DING Wen, ZHANG Hao-ping, HU Peng-sha   

  1. (College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China)
  • Received:2011-06-20 Online:2012-03-20 Published:2012-03-20

摘要: 提出一种改进的JVT-H017基本单元层码率控制算法。采用时空加权模型预测平均绝对差值(MAD),根据人类视觉系统特性设计加权Y分量的峰值信噪比(PSNR),联合新的MAD和PSNR估计基本单元层的复杂度,突出Y分量相对UV分量的重要性,并依此分配目标比特。实验结果显示,相比JVT-H017算法,改进算法更接近目标码率,码率误差平均降低0.269%,峰值信噪比平均提高0.278 dB,可保证具有误码的3G无线网络中视频图像的质量。

关键词: H.264/AVC标准, 码率控制, 平均绝对差值, 复杂度, 峰值信噪比

Abstract: This paper proposes an improved rate control algorithm for the basic-unit layer encoder of JVT-H017. Adopting a new weighted time and space model to predict the Mean Absolute Difference(MAD) and according to the Human Visual System(HVS) characteristic to design a weighted Y component of Peak Signal to Noise Ratio(PSNR), it recalculates the picture complexity of current basic-unit layer with the new MAD and PSNR, which highlights the importance of Y component compared to UV component, and then allocates target bits with above. Experimental results show that compared with the algorithms of JVT-H017, proposed algorithm is closer to the target bit, the average error rate reduces 0.269%. The average of PSNR raises 0.278 dB. The proposed algorithm still ensures the quality of the video after transporting in the 3G wireless channel.

Key words: H.264/AVC standard, code rate control, Mean Absolute Difference(MAD), complexity, Peak Signal to Noise Ratio(PSNR)

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