Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2000-11-27
2010-06-22
Czekaj, David (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
07742529
ABSTRACT:
A decoder for video signals, such as MPEG which use motion-compensated bidirectional predictive coding, performs concealment of lost or corrupted portions of a picture. For this purpose, it estimates missing motion vectors by combining the two vectors which accompany a bidirectionally coded frame to create a substitute vector. An encoder can be modified to enhance this decoder operation, including forcing at least one frame per group of frames to be coded using bidirectional prediction, and constraining the two vectors so that the substitute vector is closer to the wanted value.
REFERENCES:
patent: 5247363 (1993-09-01), Sun et al.
patent: 5410553 (1995-04-01), Choon
patent: 5825421 (1998-10-01), Tan
patent: 6025879 (2000-02-01), Yoneyama et al.
patent: 6078616 (2000-06-01), Ozcelik et al.
patent: 6480546 (2002-11-01), Kim et al.
patent: 6489995 (2002-12-01), Kok et al.
patent: 6590934 (2003-07-01), Kim
patent: 2432740 (1997-04-01), None
patent: 2255900 (2002-08-01), None
patent: 0551599 (1993-07-01), None
patent: 0588586 (1994-03-01), None
patent: 98/42137 (1998-09-01), None
Ghanbari et al., “Cell-Loss Concealment in ATM Video Codecs”, IEEE Transactions on Circuits and Systems for Video Technology, vol. 3, No. 3, Jun. 1993, pp. 238-247.
Wai-Man Lam et al. “Recovery of Lost or Erroneously Received Motion Vectors” in Proc. ICASSP, Minneapolis, MN, Apr. 1993, pp. V417-V420.
Masahiro Wada, “Selective Recovery of Video Packet Loss Using Error Concealment”, IEEE Journal on Selected Areas in Communications, vol. 7, No. 5, Jun. 1989, pp. 807-814.
T. Shanableh et al., “Backward Tracking of B-pictures Bidirectional Motion for Interframe Concealment of Anchor Pictures,” Proceedings of the IEEE International Conference on Image Processing 2000, vol. 3, Sep. 2000, pp. 396-399.
H. Sun et al., “Error Concealment in Digital Simulcast AD-HDTV Decoder,” IEEE Transactions on Consumer Electronics, vol. 38, No. 3, Aug. 1992, pp. 108-118.
C. P. Lim et al., “Cell Loss Concealment and Packetization in Packet Video,” Int. J. Imag. Syst. Technol., Special Issue on Image and Video Compression, vol. 10, No. 1, 1999, pp. 54-58.
Canadian Office Action dated Nov. 1, 2006 in CA 2,392,548.
International Preliminary Examining Report dated Jan. 22, 2002.
Arnold et al., Error Resilience in the MPEG-2 Video coding Standard for Cell Based Networks—A Review, Signal Processing Image Communication 14 (1999), 607-633.
Chen et al., “Error Control for H.263 Video Transmission over Wireless Channels”, 1998 IEEE, May 31, 1990.
Wu et al., “Joint Estimation of Forward and Backward Motion Vectors for Interpolative Prediction of Video”, 1994 IEEE Transactions on Image Processing, Sep. 3, 1994, No. 5, New York, US.
Vetro et al., “True Motion Vectors for Robust Video Transmission”, Visual Communications and Image Processing '99, San Jose, CA, USA Jan. 25-27, 1999, vol. 3653, pt. 1-2, pp. 230-240, Proceedings of the SPIE—The International Society for Optical Engineering, 1998, SPIE-Int. Soc. Opt. Eng., USA ISSN: 0277, 786X.
Shanableh, “Loss Concealment Using B-Pictures Motion Information”, 2003 IEEE Transactions on Multimedia, vol. 5, No. 2, Jun. 2003.
British Telecommunications plc
Czekaj David
Huber Jeremaiah C
Nixon & Vanderhye PC
LandOfFree
Video coding and decoding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Video coding and decoding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video coding and decoding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4207698