Patent ID: 6621865
Filing Date: 2003-09-16
Classification: H04N

Abstract:
A system for encoding a source image stream to produce a lower-layer encoded image stream and an upper-layer encoded image stream, comprising:a lower layer encoder that receives the source image stream, generates a down-converted image stream and encodes the down-converted image stream to create the lower-layer encoded image stream, the lower layer encoder forming an up-converted image stream from a decoded version of the lower-layer encoded image stream and including a non-linear processing block for processing the up-converted image stream to generate a non-linear processed image stream; and an upper layer encoder that forms the upper layer encoded image stream, the upper layer encoder forming a plurality of upper layer difference streams based on the source image stream and the non-linear processed image stream, selecting one of the upper layer difference streams, and encoding the selected stream to form the upper layer encoded image stream.