发明名称 |
Method and apparatus for scaling a compressed video bitstream |
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.
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申请公布号 |
US5889561(A) |
申请公布日期 |
1999.03.30 |
申请号 |
US19940334282 |
申请日期 |
1994.11.04 |
申请人 |
RCA THOMSON LICENSING CORPORATION |
发明人 |
KWOK, WILSON;ZDEPSKI, JOEL WALTER;SUN, HUIFANG |
分类号 |
H04N5/765;G06T9/00;H04N5/92;H04N7/26;H04N7/50;(IPC1-7):H04N7/18 |
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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