Abstract: As the next generation of new video coding standard, HEVC is designed to transmit high-quality online video in limited network bandwidth. Compared with the existing video coding standard, high efficiency video coding has greater flexibility and higher compression ratio. Coding Unit （CU） is the basic unit of the encoding process, the original algorithm gets the best CU depth by recursive quad-tree, it improves video compression performance while introducing a higher computational complexity. A fast coding depth selection algorithm has been proposed, the algorithm uses the adjacent CU depth information to calculate a depth prediction value, avoiding unnecessary calculations by this value, in order to reduce the computational complexity. Experimental results show that the algorithm ensures the effect of the video compression, while effectively reducing the computational complexity.

Key words: High Efficiency Video Coding（HEVC）, coding unit, intra prediction, depth selection

摘要： 高效视频编码（High Efficiency Video Coding，HEVC）作为下一代新的视频编码标准，旨在有限网络带宽下传输高质量的网络视频。与现有的视频编码标准相比，高效视频编码具有更高的灵活性和压缩率。编码单元（Coding Unit，CU）是视频编码处理的基本单元，原有的算法通过四叉树递归获取最佳CU深度，在提高视频压缩性能的同时引入了较高的计算复杂度。针对该问题，提出了一种快速编码深度选择算法，该算法利用相邻CU的深度信息计算一个深度预测特征值，通过该特征值进行深度选择，以避免不必要的计算，降低计算复杂度。实验结果表明，该算法在保证视频压缩效果的同时有效降低了计算复杂度。

关键词: 高效视频编码, 编码单元, 帧内预测, 深度选择