摘要:
帧内预测是H.264采用的一种编码新技术。与以前的编码标准相比, H.264编码性能有了很大的提高, 但同时编码复杂度和计算量也明显增加。该文研究了提高H.264编码速度的途径, 着重分析了帧内预测模式快速选择的问题。经过分析发现, 44亮度块的参考像素亮度值通常具有相似性, 对应地,44亮度块的9种预测模式所得的预测结果也是相近的。根据44亮度块参考像素的这一特征, 该文提出了一种基于44亮度块参考像素特征的快速帧内预测模式选择算法。实验结果说明了该文算法的有效性, 与H.264编码器JM92相比, 该算法的计算量减少了46%, 而编码质量、PSNR和输出码率保持基本不变。
Abstract:
Intra-prediction is one of the new techniques adopted by H.264. Compared with the previous video coding standards, H.264 improves coding performance greatly. However, the computation load of H.264 video coding increases drastically. This paper investigates improvement of encoding speed for H.264 with special focus on fast intra prediction mode selection. Some experimental analyses indicate that the luminance values of the reference pixels for each 44 luminance block are commonly similar, and in that case, the prediction blocks of the nine prediction modes are also similar. According to this feature of 44 luminance block, a fast mode selection algorithm for intra prediction is proposed. Experimental results show the proposed scheme is very effective. Compared with JM92 in H.264 encoder, it reduces 46% encoding time while maintaining the PSNR and bit rate.
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