Method and apparatus for scaling a compressed video bitstream
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United States of America Patent
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Mar 30, 1999
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N/A
app pub date -
Nov 4, 1994
filing date -
Nov 4, 1994
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Abstract
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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