多扫描双向参考的快速帧内预测算法

Multi-Scan and Bi-Directional Reference Fast Intra Prediction

为了进一步提高帧内预测算法的编码性能,提出了一种多扫描双向参考的快速帧内预测算法.首先通过边缘相关性选取最优的扫描模式,并通过预处理缩减单向参考预测模式的数量,然后以哈达马变换比为权重确定双向参考的预测模式,最后利用简化的率失真模型确定最终的预测模式,并用这些预测模式进行编码,大幅度提高了编码性能.仿真结果表明,与双扫描双向参考帧内预测算法相比,该算法在大幅度减少编码时间的情况下,不但使输出码率降低了2.74%,而且使重建图像的平均峰值信噪比提高了0.13dB.

A multi-scan and bi-directional reference last intra prediction algorithm is proposeu to improve the performance of intra prediction. One or more scanning modes are determined by the fringe relativity, and the number of unidirectional intra prediction modes is reduced by preprocessing. Bi-direction intra prediction modes are determined by the sum of absolute transformed difference. The final intra prediction modes are determined by simple distortion, and then encoded to greatly improve the encoding quality. Simulations and comparisons with the double scanning mode and bi-direction intra prediction algorithm show that coding time of the proposed algorithm is reduced greatly, bitrate is reduced by 2. 74% and power signal noise ratio is increased by 0.13 dB.