Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2001-05-22
2004-08-17
Philippe, Gims (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C348S461000, C348S462000, C348S463000, C348S464000
Reexamination Certificate
active
06778607
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to the encoding of information. More particularly, the present invention relates to a method and apparatus for multi-rate encoding of video sequences.
BACKGROUND OF THE INVENTION
Different communications media have different bandwidth capability. A signal needing to be sent may exceed the bandwidth of a particular medium. One method to reduce the bandwidth is to encode the signal. However, the signal may need to be sent through various media having different bandwidth capability. Thus, encoding the signal at a single bit rate may pose problems. For example, encoding a video sequence to have the highest quality for a given digital subscriber line (xDSL), may have too high a bit rate for transmission through a 56K modem line.
Numerous approaches to doing multi-rate encoding have been tried. One obvious approach is to encode the data, such as a video sequence, at multiple different bit rates by using an encoder and running the video sequence through the encoder as many times as there are bit streams to generate, each time adjusting the encoder parameters so that the output data has the proper bit rate and/or quality level. Another obvious, brute force approach, is to have a group of encoders in parallel, each running at different bit rates as is required.
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UT-VA KOC and K. J. Ray Liu, Interpolation-Free Subpixel Motion Estimation Techniques in DCT Domain, IEEE Transactions on Circuits and Systems for Video Technology, vol. 8, No. 4 Aug. 1998, pp. 460-487.
Pedro A.A. Assuncao and Mohammed Ghanbari, A Frequency-Domain Video Transcoder for Dynamic Bit-RAte Reduction of MPEG-2 Bit Streams, IEEE Transactions on Circuits and Video Technology, vol. 8 No. 8, Dec. 1998, pp. 953-967.
Yeo Boon-Lock
Zaccarin Andre
Blakely , Sokoloff, Taylor & Zafman LLP
Parsons Charles E
Philippe Gims
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