一种改进的JVT-H017码率控制算法  

Improved JVT-H017 Code Rate Control Algorithm

作　　者：丁文[1] 张浩平[1] 胡鹏莎[1] 

机构地区：[1]南京林业大学信息科学与技术学院,南京210037

出　　处：《计算机工程》2012年第6期238-240,共3页Computer Engineering

基　　金：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)

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。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.

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 

分 类 号：TN919.81[电子电信—通信与信息系统]