基于Prewitt算子的快速帧内编码算法

Fast Intra Mode Decision Algorithm Based on Prewitt Operator

本文提出了一种快速帧内编码算法,利用prewitt算子检测亮度信号的边界方向,并根据周围块的编码模式预测出可能的编码模式,将色度信号与亮度信号分开处理,然后利用拉格朗日代价函数计算出最优编码模式。实验数据表明,该算法可以极大地提高帧内编码速度,而对图像质量和码率大小变化影响极小。

This paper presents a fast intra mode decision algorithm based on Prewitt grads operator. Based on the distribution of the edge direction histogram and the mode of neighbor block, we can get some probable mode and use RDO model to decide the best mode, and the mode decision between chroma prediction and luma prediction is separated. Experimental results show that the algorithm increases the speed of intra coding significantly with negligible loss of PSNR.