现代电子技术2025，Vol.48Issue(23)：75-80,6.DOI:10.16652/j.issn.1004-373x.2025.23.011
低时延层次编码结构的联合率失真优化
Joint rate distortion optimisation framework for low delay hierarchical coding structures
摘要
Abstract
The traditional RDO methods are generally based on the assumption that the inter-frame coding units are independent with each other,and fail to fully explore the interdependence of inter-frame image coding.The inter-frame dependences are much tighter in low delay(LD)coding structures.The coding efficiency can be greatly improved by considering the inter-frame dependences.In view of the above,a joint RDO framework that considers the inter-frame dependences is proposed on the basis of LD frame structure.In the framework,Lagrange multiplier is regarded as one of the parameters to be optimized,and the methods of alternately optimizing quantization parameter(QP)and Lagrange multiplier are designed,so as to find the optimized relationship between Lagrange multiplier and QP based on the cost of rate distortion.The optimized Lagrangian multiplier and QP model are proposed on the basis of the structure obtained by alternating iteration method.Experimental results show that the proposed algorithm reaches convergence by two iterations under an LD hierarchical coding structure,saving 3.49%of the code rate despite the increase of coding time.The proposed Lagrange multiplier and QP model save 2.46%of the code rate.In comparison with the original encoder,the coding time is saved somewhat.The proposed method is effective for video compression in practical application.关键词
视频编码/率失真优化/分层编码/低时延层次编码结构/拉格朗日乘数/视频压缩Key words
video coding/RDO/hierarchical coding/LD hierarchical coding structure/Lagrange multiplier/video compression分类
电子信息工程引用本文复制引用
秦政,逄玉叶..低时延层次编码结构的联合率失真优化[J].现代电子技术,2025,48(23):75-80,6.基金项目
国家自然科学基金资助项目(61601282) （61601282）
