Method and apparatus for scaling a compressed video bitstream

Details Method and apparatus for scaling a compressed video bitstream Method and apparatus for scaling a compressed video bitstream

1994-11-04

1999-03-30

Tung, Bryan

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

348404, 348419, 348384, 348387, 348390, H04N 718

Patent

active

058895612

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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