HEVC应用前背景信息的监控视频码率分配算法  

Foreground-Background Information Based Bit Allocation Algorithm for Surveillance Video on HEVC

作　　者：李秀娟[1] LI Xiujuan(School of Information Engineering,Urumqi Vocational University,Urumqi 830002)

机构地区：[1]乌鲁木齐职业大学智能信息研究中心,乌鲁木齐830002

出　　处：《微型电脑应用》2020年第2期27-30,34,共5页Microcomputer Applications

基　　金：教育部科学基金项目(15YJC880028).

摘　　要：码率控制是视频编码中的关键技术,目标码率分配作为码率控制模型输入,对码率控制参数估计起到重要作用。新一代编码标准HEVC中的码率控制采用R-λ模型,通过分配且动态更新目标码率R计算拉格朗日乘数λ,以此对码率进行控制。监控视频具有数据量大、传输稳定度要求高、前背景划分明显等性质,对码率控制提出了更高的要求。在HEVC标准中提出基于前背景信息的监控视频码率分配算法,使得码率分配更加符合监控视频性质,进而提高码率控制参数估计准确度。提出的算法保证了监控视频码率控制性能,平均码率控制误差为0.1%。同时使前景编码质量得到提高,峰值信噪比相比于HEVC码率控制中3种码率分配算法分别提高0.36 dB、0.76 dB和0.82 dB。Rate control is a key technique in video coding,and the target bit allocation plays an important role in model parameter estimation of rate control for it is the input of the rate control model.The new generation video coding standard HEVC adopts the R-λmodel in rate control,which controls the rate by allocating and dynamically updating the rate R to calculate the Lagrange multiplierλ.The surveillance video has features such as capturing data in large scale,high demand for stable transmission,easy to be divided into foreground and background parts and so on.These all require higher rate control performance.This paper proposes a bit allocation algorithm based on foreground-background information in HEVC,which can make the bit allocation more suitable for surveillance video features and,thus,increases the rate control accuracy.The proposed algorithm maintains the rate control performance,obtaining a rate control error of 0.1%.Besides,the coding quality of foreground is increased by 0.36 dB,0.76 dB and 0.82 dB in PSNR compared with the three existing bit allocation algorithms in the rate control method of HEVC.

关 键 词：HEVC 码率控制 码率分配 监控视频 前背景信息 

分 类 号：TN919.81[电子电信—通信与信息系统]