关键词: 视频编码, 帧内预测, 模式选择

Abstract:

A novel fast intra prediction algorithm for H.264 is proposed. The nine Intra_4×4 modes are divided into three classes, the suitable mode class for current 4×4-block is predicted using the mode classes of neighboring left and up blocks. A novel Intra_4×4 mode selection method is designed based on the derived sum of absolute values of index-weighted integer transform coefficients. The quasi-stationary of locations of Intra_16×16 macroblocks (MB) in successive I-frames is exploited to reduce the computational complexity of Intra prediction. Mode selection for two chroma 8×8 blocks is accelerated based on the mode correlations between luma blocks and chroma blocks in one MB. Experiments show that the proposed algorithm can save 25% encoding time on average compared with Joint Video Team（JVT）-G013, while with better rate-distortion efficiency.

Key words: video coding, intra prediction, mode selection