Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2000-09-22
2003-12-09
Philippe, Gims S. (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240190, C382S281000, C348S398100
Reexamination Certificate
active
06661842
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to video coding, and more particularly to methods and apparatus for error-resilient video coding.
BACKGROUND OF THE INVENTION
Compression techniques in image and video coding have been developed with the assumption of a reliable and noise free transport. In current video coding standards (e.g., MPEG-1, MPEG-2, and H.263), a block-based motion estimation and compensation scheme has been adopted that is combined with Discrete Cosine Transform (DCT) coding of the motion prediction error. In order to maximize coding efficiency, motion information and the DCT coded motion prediction error are entropy coded using variable length codes. This results in a bit stream that is vulnerable to channel errors, and the quality of the reconstructed video may be substantially degraded unless redundant information or an error-correction method is applied to the bit stream.
Techniques have been introduced to mitigate the effects of channel errors, including traditional channel coding and signal recovery. For example, forward error correction, error control coding, automatic retransmission request, signal reconstruction and error concealment have been introduced to mitigate the effects of channel errors. (See, Y. Wang and Q. Zhu, “Error Control and Concealment for Video Communication: A Review,” Proceedings of the IEEE, Vol. 812, May 1998, which is hereby incorporated by reference.) Although these error-correction techniques provide satisfactory minimization of the effects that channel noise has on coded data under most, but not necessarily all, operating circumstances, the techniques generally introduce complexity and delay in the image coding process and apparatus. Moreover, the addition of redundant information to the compressed video data typically reduces the compression efficiency.
REFERENCES:
patent: 6128346 (2000-10-01), Suarez et al.
patent: 6192158 (2001-02-01), Abousleman
patent: 6195465 (2001-02-01), Zandi et al.
patent: 6219383 (2001-04-01), Park
patent: 6298163 (2001-10-01), Sodogar et al.
General Dynamics Decision Systems, Inc.
Jenner & Block LLC
Philippe Gims S.
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