CAJ | 학술논문

视频压缩标准H.264/AVC的压缩率很高,但其算法复杂,编码时间较长.针对帧内4×4块提出基于方向预测模式度量的快速预测算法,通过对当前4×4块帧内预测方向的度量,利用相邻块和相邻方向预测模式的相关性进行帧内模式预测.实验结果表明,与全搜索算法相比,在采用全1帧编码的情况下,该算法的编码时间减少43%,输出的视频比特率仅增加0.8%,且PSNR基本保持不变.
시빈압축표준H.264/AVC적압축솔흔고,단기산법복잡,편마시간교장.침대정내4×4괴제출기우방향예측모식도량적쾌속예측산법,통과대당전4×4괴정내예측방향적도량,이용상린괴화상린방향예측모식적상관성진행정내모식예측.실험결과표명,여전수색산법상비,재채용전1정편마적정황하,해산법적편마시간감소43%,수출적시빈비특솔부증가0.8%,차PSNR기본보지불변.
Video compression standard H.264/AVC has high compression ratio, but its algorithm is complex and the coding time is long. Aiming at the intra-frame 4×4 block, this paper proposes a fast prediction algorithm based on measurement of direction prediction mode. By measuring the intra-frame prediction direction of 4×4 block, it uses the correlation between neighboring blocks and neighboring direction prediction mode to predict the intra-frame mode. Experimental results show that compared with the full searching algorithm, this algorithm can decrease the coding time by 43% and only increase the output video bit rate by 0.8% while keeping PSNR almost unchanged.