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在相同的重构图像质量下,视频编码标准H.264与另两个标准H.263、MPEG-4相比,分别能节约50%、20%的码流,而且加强了对网络的支持,但其复杂度高。因此,这里对一种基于绝对变换差和(SATD)为预判断标准的快速帧内预测编码模式进行了改进,同时通过对前一帧的训练得到下一帧的阈值,从而对下一帧的宏块模式进行选择来减少帧间模式选择的计算量。仿真结果表明,在码率和PSNR基本不变的情况下,使帧内编码时间比原来下降50%左右,帧间预测模式编码时间减少到原来的40%多。
Under the same reconstructed image quality, the video coding standard H.264 can save 50% and 20% of the code stream respectively compared with the other two standards H.263 and MPEG-4, and enhances the network support. But its complexity is high. Therefore, a fast intra prediction coding mode based on Absolute Difference of Shift (SATD) is used as a pre-decision criterion, and the threshold of the next frame is obtained by the training of the previous frame, The macro block mode is selected to reduce the computational complexity of inter mode selection. The simulation results show that when the code rate and PSNR are basically the same, the intra-frame coding time is reduced by 50% than the original one and the inter-frame prediction mode coding time is reduced by 40%.