发明名称 VIDEO SIZE CONVERSION AND TRANSCODING FROM MPEG-2 TO MPEG-4
摘要 <p>A transcoder architecture that provides the lowest possible complexity with a small error, e.g., for converting an MPEG-2 bitstream into an MPEG-4 bitstream. The transcoder reads header information (304) from an input bitstream and provides a corresponding header in the new format for the outp ut bitstream. In one embodiment (Fig. 3), a low complexity front-to-back transcoder (with B frames disabled) avoids the need for motion compensation processing. In another embodiment (Fig. 4), a transcoder architecture that minimizes drift error (with B frames enabled) is provided. In another embodiment (Fig. 5), a size transcoder (with B frames enabled) is provided, e.g., to convert a bitstream of ITU-R 601 interlaced video coding with MPEG- 2 MP@ ML into a simple profile MPEG-4 bitstream which contains SIF progressive video suitable for a streaming video application. For spatial downscaling of field-mode DCT blocks, vertical and horizontal downscalling tehniques are combined to use sparse matrixes to reduce computations.</p>
申请公布号 CA2410573(A1) 申请公布日期 2001.12.13
申请号 CA20012410573 申请日期 2001.05.25
申请人 GENERAL INSTRUMENT CORPORATION 发明人 CHEN, XUEMIN;PANUSOPONE, KRIT
分类号 H04N7/30;G06T9/00;H04N7/46;H04N19/40;H04N21/2343;H04N21/236;(IPC1-7):H04N7/26 主分类号 H04N7/30
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