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The recently developed video compression standard, H.264/AVC surpasses the performance of previous video standards, such as MPEG-2, MPEG-4(part2), and H.263 and is therefore expected to be selected as the video standard for most digital video applications. The widely distributed infrastructure, however, continues to use the previous standards. Heterogeneous video transcoding offers a significant key...
In this paper, we present an efficient algorithm to transcode MPEG-4 to H.264. The algorithm exploits the information decoded from the MPEG-4 stream to reduce H.264 encoding complexity. This information includes the MPEG-4 block modes, motion vectors, and residuals. The algorithm proceeds in two steps. First, a small set of most probable H.264 block mode candidates are obtained from an MPEG-4 to H...
The existing methods to perform motion compensation (MC) in discrete cosine transform (DCT) treat each 8 times 8 block as a fundamental unit and, therefore, involve the high cost of reconstructing prediction frames, especially when the half-pixel motion vectors (MVs) are involved. The proposed method operates on a block of variable size 16 Ny times 16 Nx, where Nx and Ny are the number of adjoining...
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