GENERATING A SCALABLE CODED VIDEO SIGNAL FR OM A NON-SCALABLE CODED VIDEO SIGNAL

摘要

Method of modifying data for obtaining a scalable video signal composed of a base video signal and a set of enhancement video signals from a non-scalable video signal, in a cost-effective manner. Said method comprises :- a set of attenuation steps applied to coefficients composing said non-scalable video signal, said attenuation steps being assembled in cascaded or in series for delivering said base video signal,- a re-encoding step associated with each one of said attenuation steps for delivering one of said enhancement video signals, from the coding error generated in each attenuation step.The scalable video signal is directly generated from said coded video signal and expensive processing steps such as motion compensation and motion estimation performed in prior-art methods are thus no longer needed. The number of enhancement video signals can be easily increased by assembling, in cascade or in series, other attenuation and re-encoding steps.