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提出了一种新颖的4×4快速帧内预测模式选择算法。该算法挖掘了帧内预测算法本身的部分性质,即不同像素在不同预测方向中的频度权重不同这个特点,同时利用了子块的平滑性与相关性,设计了3个能快速命中预测模式的自适应门限。实验表明本算法能在几乎不改变PSNR的情况下大幅度降低4×4帧内预测复杂度。
A novel 4 × 4 fast intra prediction mode selection algorithm is proposed. The algorithm exploits some of the properties of the intra prediction algorithm itself, that is, the different pixels have different frequency weights in different prediction directions. At the same time, the smoothness and correlation of sub-blocks are used to design three fast hit prediction modes Adaptive threshold. Experiments show that this algorithm can reduce 4 × 4 intra prediction complexity with little change in PSNR.