适合于空间可伸缩编码的帧内快速算法  

A Fast Intra Prediction Algorithm for Spatial SVC

作　　者：汪大勇[1] 孙世新[2] 杨浩淼[2] 李杰 舒剑[4] 

机构地区：[1]襄樊学院数学与计算机学院,襄樊441053 [2]电子科技大学计算机科学与工程学院,成都610054 [3]空间微波技术国家级重点实验室,西安710000 [4]江西财经大学国际经贸学院,南昌330013

出　　处：《计算机辅助设计与图形学学报》2010年第11期1959-1965,共7页Journal of Computer-Aided Design & Computer Graphics

基　　金：空间微波技术国家级重点实验室基金(9140C5301020801)

摘　　要：根据空间可伸缩编码的特征,提出一种适合于增强层的帧内快速编码算法.首先根据基本层和相邻宏块提出当前宏块的块模式选择,并利用残差预测来加快编码速度;然后提出Intra16和Intra42种块模式的方向模式选择.在Intra16模式中,根据宏块纹理来预测采用各种方向模式的可能性,按照其从大到小顺序编码,并结合残差预测来加快编码速度;在Intra4中,根据基本层子块和相邻子块的方向预测当前子块可能的方向模式和各种方向模式的可能性,并结合零块提前预测来进一步加快编码速度.实验结果证明,与标准算法相比,文中算法的计算复杂度平均降低了75%,同时对编码质量和比特率几乎没有影响.According to the characteristics of the spatial scalable video coding,a fast intra encoding algorithm is proposed for the enhancement layer.Firstly,according to the base layer and the adjacent macroblock,the current macroblock mode selection is proposed,and the residual prediction is applied to increase the coding speed.Then direction mode selection for Intra16 and Intra4 is proposed.In Intra16 mode,the texture of macroblock is applied to predict the possibility of each of direction mode,and the encoding is carried out according to the value of the possibility in a decreasing order,combined with the residual prediction to accelerate the encoding speed;In Intra4 mode,the possible direction mode of the current sub-block and its possibility value is predicted according to the base sub-block and the adjacent sub-block,combined with early zero-block detection for a further improvement on the coding speed.The experimental results show that the computational complexity of the algorithm is reduced by 75% on average compared with the standard method,with only negligible coding loss and bit-rate increases.

关 键 词：宏块模式 方向模式 残差预测 零块提前预测 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]