计算机工程2017，Vol.43Issue(5)：281-285,5.DOI:10.3969/j.issn.1000-3428.2017.05.045
基于H.264的转码初始量化参数自适应选择
Adaptive Selection of Transcoding Initial Quantization Parameter Based on H.264
摘要
Abstract
For different video content causes poor quality in the front few frames.This paper proposes an initid Quantization Parameter(QP) selection algorithm based on Ⅰ frame complexity.The algorithm utilizes the three prediction modes of Ⅰ frame and calculates the complexity of Ⅰ frame.At the same time,combining with the target bit rate and the relationship between initial QP selects the best initial QP.Experimental results show that compared with other algorithms under the same bit rate,the algorithm avoids disadvantages of the traditional rate control of initial QP selection algorithm,it improves the quality of video and reduces the complexity of judgment Ⅰ frame.The predicted initial QP is more accurate,and it greatly improves the performance of rate control.The average Peak Signal to Noise Ratio (PSNR) is improved by 0.6 dB and the maximum performance gain in PSNR is up to 1.69 dB.关键词
视频转码/量化参数/复杂度/码率控制/H.264标准Key words
video transcoding/Quantization Parameter(QP)/complexity/code rate control/H.264 standard分类
信息技术与安全科学引用本文复制引用
张安娜,王中元..基于H.264的转码初始量化参数自适应选择[J].计算机工程,2017,43(5):281-285,5.基金项目
湖北省自然科学基金(2015CFB406). （2015CFB406）
