Patent ID: 8121191
Filing Date: 2012-02-21
Classification: H04N

Abstract:
1. A method for generating a scalable compressed video stream, comprising the steps of: providing an input compressed video stream which is coded with a first value for a particular quality parameter; and using a transcoder, transcoding the input compressed video stream to both a base output stream and an enhancement signal, wherein the base output stream is coded with a second value for the particular quality parameter, the second value being of lower quality than the first value for the particular quality parameter, and wherein the enhancement signal is combinable with the base output stream to yield a picture sequence having a third value for the particular quality parameter, the third value being of higher quality than the second value for the particular quality parameter, and wherein the enhancement signal depends on the base output stream by combination with the base output stream, to reconstruct the picture sequence having the third value for the particular quality parameter.