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本文为MPEG-2到JVT／AVC／H.264的转码提供了一种高效的块模式决策算法。这种新的决策算法既充分地利用了原始序列与当前待编码的H.264宏块相对应的16个MPEG-2宏块的信息,又参考了转码后序列的当前帧中与待编码宏块相邻的多个宏块的信息以及前一帧相应宏块的信息。本文在利用已知宏块的信息预测待编码宏块块模式的过程中,引入了“模式子集”的概念。由于这个子集中元素的数目较少,所以待编码宏块在该子集中挑选适合的块模式,可以极大地节省编码时间,提高编码效率,而与此同时对PSNR以及视频图像主观性能的影响不大。另外,本文进一步扩展了“主导宏块”的概念,并将之应用于块模式的决策中,从而有效地提高编码效率。
This article provides an efficient block mode decision algorithm for MPEG-2 to JVT / AVC / H.264 transcoding. This new decision-making algorithm not only makes full use of the information of 16 MPEG-2 macroblocks whose original sequence corresponds to the current H.264 macroblock to be encoded, but also refers to the information of the current frame to be encoded in the transcoded sequence Information of a plurality of macroblocks adjacent to the macroblock, and information of a corresponding macroblock of a previous frame. In this paper, we use the information of known macroblock to predict the mode of macroblock to be encoded, and introduce the concept of “pattern subset”. Due to the small number of elements in this subset, selecting the appropriate block mode in this subset by the macroblock to be encoded can greatly reduce the coding time and improve the coding efficiency, while at the same time having an impact on the PSNR and the subjective performance of the video image Big. In addition, this paper further extends the concept of “dominant macroblock ” and applies it to the decision of block mode, so as to effectively improve the coding efficiency.