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Multiplexer-related

Multimedia-compression-system-with-adaptive-block-sizes

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Details

Inventors: Chaddha, Navin;
Assignee: Microsoft Corporation (Redmond, WA)
Primary Examiner: Britton; Howard
Assistant Examiner: Diep; Nhon T
Attorney, Agent or Firm: Lee & Hayes, PLLC

A multimedia compression system for generating frame rate scalable data in the case of video, and, more generally, universally scalable data Universally scalable data is scalable across all of the relevant characteristics of the data. In the case of video, these characteristics include frame rate, resolution, and quality. The scalable data generated by the compression system is comprised of multiple additive layers for each characteristic across which the data is scalable. In the case of video, the frame rate layers are additive temporal layers, the resolution layers are additive base and enhancement layers, and the quality layers are additive index planes of embedded codes. Various techniques can be used for generating each of these layers (e.g., Laplacian pyramid decomposition or wavelet decomposition for generating the resolution layers; tree structured vector quantization or tree structured-scalar quantization for generating the quality layers). The compression system further provides for embedded inter-frame compression in the context of frame rate scalability, and non-redundant layered multicast network delivery of the scalable data.

DETAILED DESCRIPTION The present invention provides for compression and multicast network delivery of multimedia data in a format scaleable across one or more of the characteristics of that data.
There are several aspects of the invention that are brought together to achieve optimal benefits, but which can be used separately.
One aspect of the present invention is a compression system for generating frame rate scaleable data for video.
Frame rate scaleable data is scaleable across at least frame rate, and possibly additional video characteristics.
The present invention includes a compression system for generating universally scaleable data.
Multimedia data can be described by a certain set of characteristics.
Universally scaleable data is scaleable across that entire set.
In the case of video, universally scaleable data is scaleable across frame rate, resolution, and quality.
In the case of audio data, universally scaleable data is scaleable across resolution and quality.
Universal scalability allows for flexible bandwidth and computational scalability.
This makes universal scalability particularly useful for streaming multimedia applications over heterogeneous networks.
Another aspect of the present invention is a means for generating frame rate scaleable data which includes inter-frame compression.
This results in an embedded inter-frame compression technique which achieves higher compression in addition to achieving frame rate scalability.
A final aspect of the present invention is multicast network delivery of frame rate scaleable data and universally scaleable data Specifically, various layers of the scaleable data are divided and delivered over multiple multicast channels.
Depending upon the bandwidth and computational power available to a network participant, that participant can subscribe to one or more multicast channels, thus optimizing the multimedia presentation to that participant.
It is not necessary for all aspects of the invention to be practiced together to attain advantages

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