Method and system for scalable representation, storage, transmission and reconstruction of media streams

摘要

Methods and systems for defining a compression and reconstruction scheme of a media stream, for generating and transmitting a base media layer and enhancement data layers and for reconstructing compressed representations of the media stream from the base media layer and the enhancement data layers.

主权项

1. A method for transmitting a transmitted representation of a media stream over a bandwidth limited medium, the method comprising the steps of:
determining a plurality of compression functions of statistically distinct compression levels, wherein applying a compression function on the media stream produces a compressed representation: of the media stream; determining a relationship between valid values of compressed representations of the media stream; defining the statistically most compressed representation of the media stream as a base layer media stream; defining enhancement data for representing a relationship between valid values of the compressed representations of the media stream; compressing the media stream by applying the compression functions, thereby producing a plurality of compressed representations of the media stream; determining if enhancement data is required for reconstructing a compressed representation of the media stream; generating an enhancement data layer, in response to the determination; determining an available bandwidth of the bandwidth limited medium; generating a transmitted representation of the media stream, the transmitted representation of the media stream comprises the base media layer and at least one successive enhancement data layer, wherein the aggregate bandwidth of the base media layer and the at least one successive enhancement data layer does not exceed the available bandwidth of the bandwidth limited medium; and providing the transmitted representation of the media stream to the bandwidth limited medium; wherein compressed representations of the media stream comprise a plurality of symbols, the symbols of a p'th compressed representation of the media stream are defined as a p'th media layer symbol; wherein for each symbol of the original media layer and for each value of p between 2 and k executing the steps of:
converting the original media layer to a (p−1)th media layer symbol and to a p'th media layer symbol; whereas the base media layer symbol defined as the l'th media layer symbol;determining whether a generation of a pth layer enhancement data symbol is required for reconstructing the pth media layer symbol;generating a p'th layer enhancement data symbol, in response to the determination;finding the associated pth media layer symbols associated with each original media layer symbol of the original (p−1)th layer symbol set; anddefining a union of all the associated pth media layer symbols as a pth media layer set;wherein for each p that exceeds one, the determination is responsive to an amount of pth media layer symbols associated with the (p−1)th media layer symbol;defining an original (p−1)th layer symbol set for each (p−1)th media layer symbol, the original (p−1)th media layer set comprising of original media layer symbols associated with pth media layer symbol that are associated with the (p−1)th media layer symbols.