Encoding method and apparatus enabling fast channel change of compressed video
AssigneeThomson Licensing
InventorsJill Boyce, Alexandros Tourapis, Jeffrey Cooper
Life of this patent
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Abstract
A video encoder and corresponding method are described for enabling fast channel change of compressed video, where a video encoder for receiving input pictures and providing compressed stream data includes a normal encoding portion for receiving input pictures and providing normal stream data, a lower-quality encoding portion for receiving input pictures and providing channel change stream data, and a multiplexor in signal communication with each of the normal and lower-quality portions for receiving and combining the normal and channel change data streams.
Claims15
A video encoder for receiving input pictures and providing compressed stream data, the encoder comprising:
- a normal encoding portion for receiving input pictures and providing normal stream data;
- a lower-quality encoding portion for receiving input pictures and providing channel change stream data;
- and
- a multiplexor in signal communication with each of the normal and lower-quality portions for receiving and combining the normal and channel change data streams
A video encoding method for receiving input pictures and providing compressed stream data, the method comprising:
- receiving input pictures;
- encoding normal stream data from the received input pictures;
- encoding channel change stream data from the received input pictures wherein the channel change stream data comprises lower-quality encoded data than the normal stream data;
- and
- multiplexing the normal and channel change data streams into a combined output stream.
A video encoding apparatus for receiving input pictures and providing compressed stream data, the apparatus comprising:
- means for receiving input pictures;
- means for encoding normal stream data from the received input pictures;
- means for encoding channel change stream data from the received input pictures, wherein the channel change stream data comprises lower-quality encoded data than the normal stream data;
- and
- means for combining the normal and channel change data streams into a combined output stream.
A digital videodisc encoded with signal data comprising a plurality of block transform coefficients for each of normal stream and channel change stream data, the coefficients indicative of an original signal data sequence, the normal stream data of the digital videodisc having coefficients embodying a normal quality data sequence, and the channel change stream of the digital videodisc having coefficients embodying a reduced-quality data sequence, the reduced-quality data sequence comprising at least one additional intra-coded picture.
Dependencies are inferred from the claim text.