屏幕图像压缩中串复制位移参数的高效编码算法

发布时间：2018-03-25 19:37

本文选题：视频编码　切入点：复合图像　出处：《计算机学报》2017年05期

【摘要】：位移(Offset)参数是帧内串复制(ISC)算法中复制参数的重要组成部分,用来表示当前待编码或解码像素串与参考像素串之间的位置关系.如何对Offset参数进行有效编码成为ISC算法中提高屏幕图像编码(SCC)效率的一个核心问题.为了消除现有Offset参数编码算法中的冗余,根据Offset参数的统计特性和找出Offset参数之间以及Offset参数与其他编码参数之间的相关性,提出了改进的Offset参数编码算法.该算法主要由Offset联合编码方案、水平扫描时OffsetX映射方案和截断2阶指数哥伦布编码方案组成.实验结果表明,对于SCC标准测试数据集中的视频序列,提出的Offset参数编码算法与现有的算法相比,在几乎没有增加编解码复杂度的前提下,对于全帧内(AI)、随机接入(RA)、低延迟(LB)3种编码配置,有损BD-rate平均降低率分别可达2.1%、1.5%、1.4%;无损Bit-rate总节省率分别可达1.8%、1.1%、1.1%,能有效提高编码效率.
[Abstract]:The offset offset parameter is an important part of the replication parameters in the intra string replication (ISCS) algorithm. It is used to express the position relationship between the pixel string to be encoded or decoded and the reference pixel string. How to effectively encode the Offset parameters becomes a core problem in the ISC algorithm to improve the efficiency of screen image coding. Redundancy in existing Offset parameter coding algorithms, Based on the statistical characteristics of Offset parameters and the correlation between Offset parameters and other coding parameters, an improved Offset parameter coding algorithm is proposed. The composition of OffsetX mapping scheme and truncated second-order exponential Columbus coding scheme during horizontal scanning. The experimental results show that the proposed Offset parameter coding algorithm is compared with the existing algorithms for video sequences in the SCC standard test data set. On the premise of almost no increase in coding and decoding complexity, random access and low delay LBU are three kinds of coding configurations. The average reduction rate of lossy BD-rate can be up to 2.1% and 1.5% 1.4, respectively, and the total saving rate of lossless Bit-rate can reach 1.8% 1.1 / 1.1 respectively, which can effectively improve the coding efficiency.
【作者单位】：同济大学超大规模集成电路研究所;嘉兴学院数理与信息工程学院;
【基金】：国家自然科学基金(61601200,61271096) 高等学校博士学科点专项科研基金博导类资助课题(20130072110054) 嘉兴学院科研重点课题(70112027BL)资助~~
【分类号】：TN919.81

【相似文献】