一种改进的HEVC帧内预测算法

摘要

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 HM10.0 with drops of 0.04dB PSNR and increase of 1％ BiteRate,which can ensure the encoding quality and reduce the encoding time.%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.