Patent ID: 6480547
Filing Date: 2002-11-12
Classification: H04N

Abstract:
A video encoder comprising:base layer circuitry capable of receiving an input stream of video frames and generating therefrom compressed base layer video data suitable for transmission to a streaming video receiver, said base layer video data comprising a plurality of original transform coefficients (O) associated with said input stream of video frames and a plurality of reconstructed base layer transform coefficients (B) generated by quantizing and de-quantizing said plurality of original transform coefficients (O); and enhancement layer circuitry capable of receiving said plurality of original transform coefficients (O) and said plurality of reconstructed base layer transform coefficients (B) and generating therefrom a residual signal (R) proportional to a difference between said plurality of original transform coefficients (O) and said plurality of reconstructed base layer transform coefficients (B), wherein said enhancement layer circuitry encodes and sends a sign of said residual signal (R) to said streaming video receiver.