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MPEG-2/MPEG-4实时转换I帧的快速补偿算法?

DOI: 10.13190/jbupt.200801.116.073, PP. 116-119

Keywords: MPEG-2,MPEG-4,码流转换,离散余弦变换域,重量化

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Abstract:

基于离散余弦变换(DCT)域的MPEG-2到MPEG-4实时转码中,MPEG-2的帧内编码帧(I帧)进行部分解码后所得到的DCT数据不能直接在MPEG-4重量化中使用,提出了一种基于DCT域的I帧快速补偿算法.该算法避免了重新进行DCT变换和逆变换,每个宏块节省6次DCT变换和6次逆DCT变换的时间.实验结果表明,与采用像素域补偿算法进行I帧转码相比,采用快速补偿算法节省了65.05%的时间,并且转码后I帧的峰值信噪比(PSNR)值偏差不超过0.001dB.

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