利用参考像素相似度检测的帧内预测编码

摘要

A novel intra prediction algorithm is proposed to improve the coding efficiency. The proposed method judges the overall similarity of the prediction pixels:In the case of high similarity, the Direct Current (DC) only mode is used, and it adaptively skips the prediction mode bits,which not only improves the coding efficiency,but also reduces the encoding complexity; otherwise,all the directional prediction modes are used and one of them is selected through RDO(Rate-Distortion Optimization) in H.264/AVC.Experimental results show that the proposed method achieves an average bit-rate reduction of 1.42％ and encoding time reduction of 32.2％ with the same Peak Signal Noise Ratio(PSNR).%为进一步提高帧内预测的编码性能,提出一种新的帧内预测算法.算法对用于预测的参考像素进行相似度检测,当参考像素相似度高时,直接使用平均模式预测,省略了用于编码预测模式的比特,节省了码率,并减少了用于率失真优化所需的计算量,降低了计算复杂度;在各参考像素差异较大时,则按H.264/AVC中率失真优化的方法进行模式选择.实验结果表明,该算法在同样的峰值信噪比(PSNR)下,平均码率降低1.42%,编码速度提高了32.2%.