发明名称 |
VIDEO SIZE CONVERSION AND TRANSCODING FROM MPEG-2 TO MPEG-4 |
摘要 |
<p>Methods and apparatus for performing 2:1 downscaling on video data are provided. At least one input matrix of NxN (e.g., N=16) Discrete Cosine Transform (DCT) coefficients is formed from the video data by combining four N/2xN/2 field-mode DCT blocks. Vertical downsampling and de-interlacing are performed to the input matrix to obtain two N/2xN/2 frame-mode DCT blocks. An NxN/2 input matrix is formed from the two frame-mode DCT blocks. Horizontal downsampling is performed to the NxN/2 matrix to obtain one N/2xN/2 frame-mode DCT block. <IMAGE></p> |
申请公布号 |
EP1287704(A2) |
申请公布日期 |
2003.03.05 |
申请号 |
EP20010944633 |
申请日期 |
2001.05.25 |
申请人 |
GENERAL INSTRUMENT CORPORATION |
发明人 |
PANUSOPONE, KRIT;CHEN, XUEMIN |
分类号 |
G06T9/00;H04N19/40;H04N21/2343;H04N21/236;(IPC1-7):H04N7/26 |
主分类号 |
G06T9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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