【摘要】 为降低H.264/AVC帧内预测计算复杂度,提出了基于频域特征的快速帧内编码模式预测算法.首先,对要编码的4×4块进行DCT变换,得到少数的几个DCT系数.然后,通过这几个系数计算块的特征方向和方差.最后,根据特征方向和方差计算最可能的几种预测模式.实验验证了该算法在不牺牲图像质量和压缩效率的基础上将帧内预测的计算复杂度平均降低了67.5%.更多还原

【Abstract】 To reduce the intra-prediction complexity in H.264/AVC,a fast intra-prediction mode selection algorithm was proposed.It calculates the DCT(discrete cosine transform) coefficients for each block,and uses frequency domain features of the target block to eliminate the majority of candidate modes.Simulations verify that the proposed method speeds up the intra-prediction process by 67.5% on average without sacrificing the picture quality and compression ratio.更多还原