发明名称 |
Verfahren und Einrichtung zum Skalieren eines komprimierten Videobitstromes |
摘要 |
A method and apparatus for scaling the bitstream of a compressed video signal includes partial decoding hardware (38, 41) to permit excising of higher frequency AC DCT coefficients or re-quantizing quantized data with a coarser quantization factor. The scaling is performed on a block (macroblock) basis in a manner which linearly scales the amount of compressed data per block. An analyzer (40) generates a profile of cumulative partially decompressed data over a video frame, and bitstream scaling (42) is performed in a manner which insures that a profile of the scaled signal substantially comports with the profile of the original data. <IMAGE> |
申请公布号 |
DE69524847(D1) |
申请公布日期 |
2002.02.07 |
申请号 |
DE1995624847 |
申请日期 |
1995.10.25 |
申请人 |
RCA THOMSON LICENSING CORP., PRINCETON |
发明人 |
KWOK, WILSON;SUN, HUIFANG;ZDEPSKI, JOEL WALTER |
分类号 |
H04N5/765;G06T9/00;H04N5/92;H04N7/26;H04N7/50;(IPC1-7):H04N7/50 |
主分类号 |
H04N5/765 |
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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