关键词: H.264/AVC, 帧内预测, 混合特征, 快速帧内预测模式决策

Abstract: Due to the use of Rate Distortion Optimization(RDO) for the decision of multiple intra-prediction modes, a full search method used in reference software of H.264/AVC comes at a cost in greatly increased complexity at the encoder. In order to improve the time efficiency of the encoder, a mixed features-based on fast intra-prediction mode decision method aiming at 44 luminance blocks was proposed. DC mode was emphasized in this method, and it was combined with the mixed features of cost functions to form mixed decision information. Advance modes were filtered by virtue of these mixed features, and the decision approach was speeded up. The experiment results show that the new scheme is able to achieve a reduction of up to 30% encoding time for I frames of image sequences, with negligible Peak Signal-Noise Ratio (PSNR) loss and bit rate increase compared with the original H.264/AVC reference software.

Key words: H.264/AVC, intra-prediction, mixed features, fast intra-prediction mode decision