一种基于视觉感知的H.264码率控制算法

发布时间：2018-02-28 08:38

本文关键词： 码率控制恰可察觉失真比特分配结构相似度　出处：《图学学报》2014年05期 　论文类型：期刊论文

【摘要】：针对目前视频编码标准H.264的码率控制算法未考虑人眼视觉感知、易导致编码后视频图像质量波动的不足,提出了一种基于视觉感知的H.264码率控制算法。首先,设计了像素域的恰可察觉失真模型。在此基础上,根据各帧的恰可察觉失真的大小进行帧层比特分配。其次,建立了基于结构相似度的率失真模型,并采用此模型设计了基本单元层(basic unit,BU)的比特分配方案。最后结合二次速率-量化模型得到量化参数。实验结果表明,该算法与目前H.264中典型的码率控制算法相比,错误率降低了0.2%。
[Abstract]:In view of the fact that the rate control algorithm of H.264, the current video coding standard, does not take human visual perception into account, it is easy to cause the video image quality fluctuation after coding. A rate control algorithm based on visual perception for H.264 is proposed. On the basis of this, the frame layer bit allocation is carried out according to the size of each frame. Secondly, a rate-distortion model based on structural similarity is established. This model is used to design the basic unit layer basic unit-Bu) bit allocation scheme. Finally, the quantization parameters are obtained by combining the quadratic rate-quantization model. The experimental results show that the proposed algorithm is compared with the typical rate control algorithm in H.264. The error rate has been reduced by 0.2.
【作者单位】：铜仁学院数学与信息工程系;广东工业大学自动化学院;
【基金】：国家自然科学基金青年科学基金资助项目(61201392) 铜仁学院科研启动基金资助项目(TS10014)
【分类号】：TN919.81

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