H.264快速帧内预测算法  

Fast intra-prediction algorithm in H264

作　　者：杨黎波[1] 唐慧明[1] 徐华根[1] 

机构地区：[1]浙江大学信息与电子工程系,浙江杭州310027

出　　处：《浙江大学学报（理学版）》2006年第2期156-160,共5页Journal of Zhejiang University（Science Edition）

摘　　要：在新制定的H．264视频编解码标准中，帧内预测是一项重要的技术．它利用周围像素预测当前块来降低空间冗余，能极大地提高H.264的编码效率．然而，帧内预测的4×4及16×16预测分别有9种和4种模式．为选出最佳模式。全搜索算法需要花费极大的计算量．为了降低帧内预测的复杂度，提出了一种快速帧内预测算法．该算法针对全I帧编码，充分利用了时域、空域及不同块大小间的相关性来预测当前块的最佳模式，并结合提前中止算法来减少不必要的模式选择计算．实验结果表明：与全搜索相比，文中提出的算法能减少50％～75％的帧内预测计算量，而保持图像质量几乎不变．Intra-prediction is an important feature in the new H. 264 video coding standard. It predicts the current block with surrounding pixels to reduce the special redundancies and improves coding efficiency of H. 264 greatly. However, there are 9 and 4 candidate modes for 4 × 4 and 16 × 16 intra-prediction respectively. The full search algo rithm used to select the best mode is computationally expensive. To reduce its complexity, a fast intra-prediction algorithm was proposed. Based on the all I-frame coding, it took advantage of the strong correlations in temporal domain,spatial domain and different block-sizes to predict the best mode of the current block. An early termination mechanism was further incorporated to avoid unnecessary computations when a good decision can be made in early stage. Experimental results show that compared to full search, the proposed method can reduce 50%-75% computational load of the intra-prediction while the quality degradation is negligible.

关 键 词：视频编码 帧内预测 快速算法 H.264/JVT 

分 类 号：TN919.8[电子电信—通信与信息系统] TN94[电子电信—信息与通信工程]