一种面向屏幕视频的快速帧内编码算法

A fast intra coding algorithm for screen video

针对屏幕视频含有大量均匀平坦的区域、重复的图样及锐利的边缘等特点,提出一种面向屏幕视频的快速帧内编码算法,包括编码单元快速划分算法和预测模式快速选择算法。在编码单元快速划分算法中,根据屏幕视频空间相关性、CU灰度共生矩阵和CU编码比特所体现的纹理复杂度等特性来决定CU的提前终止与早期划分,从而减少编码深度的遍历过程。在预测模式快速选择算法中,根据PU的模式相关性来选择跳过预测模式,从而降低计算复杂度。实验结果表明,与参考编码模型SCM6.0相比,所提算法的编码时间缩短了32.72%,码率仅上升1.64%。

Aiming at the characteristics of screen video including a large number of uniform and flat areas, repeated patterns and sharp edges, a fast intra-frame coding algorithm for screen video is proposed, including fast coding unit division algorithm and fast prediction mode selection algorithm. In the fast coding unit division algorithm, the early termination and early division of the CU are determined according to the characteristics of the screen video spatial correlation, the CU gray-level co-occurrence matrix and the texture complexity embodied by the CU coding bits, thereby reducing the traversal process of the code depth. In the fast prediction mode selection algorithm, the skip prediction mode is selected according to the mode correlation of the PU, thereby reducing the computational complexity. Experimental results show that, compared with the reference coding model SCM6.0, the coding time of the proposed algorithm is shortened by 32.72%, while the code rate is increased by 1.64%.