一种改进的HEVC帧内预测算法  

An Optimized Algorithm for HEVC Intra Prediction

作　　者：谌博[1] 顾梅花[1] 马蒙蒙[1] 

机构地区：[1]西安工程大学电子信息学院,西安710048

出　　处：《计算机与数字工程》2017年第1期131-134,共4页Computer & Digital Engineering

基　　金：国家自然科学基金资助项目(编号:61401347);陕西省教育厅科学研究项目(编号:16JK1329)资助

摘　　要：针对高效视频编码(HEVC)帧内预测中编码单元(CU)划分复杂度过高的问题,提出了一种改进的HEVC帧内预测算法。该算法根据视频帧的时间相关性和时空相邻CU的相关性,通过比较当前CU与已编码帧图像对应位置CU和邻近CU的深度,可以跳过不必要的整块预测和子块预测,加速帧内预测过程。实验结果表明,与HM10.0相比,该算法峰值信噪比(PSNR)平均下降了0.04dB,比特率(BitRate)平均增加1%,平均编码时间能够缩减30%,能够在保证编码图像质量的情况下有效的降低编码复杂度。In order to solve the problem of the high complexity of CU division in HEVC intra prediction,an optimized intra prediction algorithm of HEVC is proposed.Based on the time relativity of the video sequence,the algorithm can compares the depth of CU of the current coding unit with the adjacent CUs as well as the same position CU of the previous frame,skips unnecessary block prediction and sub block prediction.This process can accelerate encoding time.The experimental results show that the algorithm provides averagely 30% reduction of intra coding time compared with the one accepted by HM10.0with drops of 0.04 dB PSNR and increase of 1% BiteRate,which can ensure the encoding quality and reduce the encoding time.

关 键 词：HEVC 帧内预测 编码 邻近CU 

分 类 号：TN919.81[电子电信—通信与信息系统]