CAJ | 학술논문

H.264在空间域上从多个方向进行多种模式的帧内预测,并使用率失真优化算法选择最佳模式,使编码的复杂度大幅增加.为此,提出了一种基于方向测度的快速帧内预测算法.该算法使用方向测度来判断块的平坦程度和纹理方向,它可以预先排除可能性小的预测模式,避免了不必要的代价计算.实验结果表明,算法在保持信噪比平均降低0.05 dB和码率平均增加1.27%基础上,编码时间平均减少了39.16%.
H.264재공간역상종다개방향진행다충모식적정내예측,병사용솔실진우화산법선택최가모식,사편마적복잡도대폭증가.위차,제출료일충기우방향측도적쾌속정내예측산법.해산법사용방향측도래판단괴적평탄정도화문리방향,타가이예선배제가능성소적예측모식,피면료불필요적대개계산.실험결과표명,산법재보지신조비평균강저0.05 dB화마솔평균증가1.27%기출상,편마시간평균감소료39.16%.
H.264 provides several predicting modes and directions for intra prediction in the spatial region,and the optimal mode is selected by Rate Distortion Optimization(RDO) with high coding complexity.In order to solve this problem,a fast algorithm of intra prediction for H.264 based on direction measure is proposed.The algorithm utilizes direction measure to estimate the flatness and texture direction of a block,and precludes some less probable prediction modes to avoid unnecessary cost computations.Ex-perimental results show that the proposed algorithm can averagely reduce encoding time by 60% with 0.05 dB PSNR loss and 1.27% bit rate increase on average.