基于零系数块和快速MPPM的AVS帧内预测算法  

Intra Prediction of AVS Based on Zero-block and Fast MPPM

作　　者：张永强[1] 王双龙[1] 

机构地区：[1]河北工程大学信息与电气工程学院,河北邯郸056038

出　　处：《电视技术》2014年第5期24-27,41,共5页Video Engineering

摘　　要：针对AVS帧内预测编码模式的选择和流程相对复杂的问题,提出了一种快速AVS帧内预测算法。该算法先判断当前子块是否为零系数块,进而决定下一步操作是进行最佳候选模式筛选还是直接编码cbp,避免对零系数块进行变换等帧内编码的复杂操作。对于非零系数块,通过快速算法筛选出最佳候选模式也很大程度提高了编码效率,从理论上排除了至少40%不可能的预测模式。实验验证在IPPP帧格式下,PSNR下降控制在0.2 dB内,平均比特数增加少于2%,编码时间至少减少31%。As to the complexity of choice of prediction and steps, an improved algorithm of fast intra prediction for AVS is provided. It avoids operations of invert in intra prediction according to the result of whether the current block is zero block to decide it whether it should choose the most probable prediction mode and then do the follows or encode the element of cbp directly. As to the non-zero block ,it excludes forty percent tin-probable prediction modes in theo-ry ,which at first choose out most probable prediction modes at large improve the efficiency of encode. For the frame type of IPPP,it provides the decrease of PSNR in 0.2 dB ,increase of average bits encoded in two percent,but the decrease of average time encoding more than thirty-one percent.

关 键 词：AVS 帧内预测编码 零系数块 最佳预测模式 

分 类 号：TN919.8[电子电信—通信与信息系统]