【摘要】 H.264编码标准利用基于各种不同大小块的运动估计和补偿,从而显著的提高了编码效率。但运动估计和离散余弦变换(DCT)也大大的增加了计算复杂度,使编码时间随之增加。本文提出了一种提前进行模式选择的算法,先进行16×16大小全零块的检测,然后在此基础上预先进行模式选择的判断,用以控制编码复杂度。实验结果显示在信噪比略有下降的同时,总的编码时间平均可以节省75.11%,而用以进行运动估计的时间平均可以节省84.25%。更多还原

【Abstract】 The newest video compression standard H.264 significantly outperforms previous standards with multiple block size,Motion Estimation adopted.However,the encoding time of Motion Estimation and Discrete Cosine Transform is dramatically increased as a result.We propose an early mode decision algorithm to control the computation complexity.It derives a threshold to make mode decisions in advance.Experimental results show that 75.11%encoding time and 84.25% Motion estimation time can be saved on average with little PSNR dropped.更多还原