Patent ID: 6263022
Filing Date: 2001-07-17
Classification: H04N

Abstract:
For use in a video encoder comprising: 1) a base layer circuit capable of receiving an input stream of video frames and generating therefrom compressed base layer video frames suitable for transmission to a streaming video receiver, and 2) an enhancement layer circuit capable of receiving said input stream of video frames and a decoded version of said compressed base layer video frames and performing bit-plane coding to generate therefrom enhancement layer video data associated with, and allocated to, corresponding ones of said compressed base layer video frames, an adaptive quantization controller capable of receiving at least one quantization parameter from said base layer circuit and, in response thereto, determining a corresponding shifting factor for shifting at least one bit plane associated with said enhancement layer video data and modifying a data field in said enhancement layer video data to cause said video streaming receiver to assign a higher decoding priority to said shifted at least one bit plane.