Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1998-10-02
2000-06-27
Britton, Howard
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
348419, 348421, 382239, 382243, H04N 712, H04N 1102, H04N 1104
Patent
active
06081554&
ABSTRACT:
In a digital video compression system that includes both a real buffer of size B.sub.max, and a smaller virtual buffer of size B.sub.virtual, a method for controlling the generated bit rate of compressed video information to keep within the maximum buffer capacity is disclosed. The method includes the steps of (a) receiving blocks of digital information, (b) determining whether a current block can be compressed by one of one or more shortcuts and using the shortcut if possible; (c) if the current block cannot be compressed with any shortcut, determining whether the virtual buffer capacity will be exceeded if the current received block is compressed only by arithmetic coding and using only arithmetic coding if possible; (d) if the current block cannot be compressed with any shortcut and the virtual buffer capacity would be exceeded with only arithmetic coding, determining whether the virtual buffer capacity will be exceeded if the current block is compressed with both downsampling and arithmetic coding and using both downsampling and arithmetic coding if possible; and (e) if all else fails, compressing the current block with a default mode of compression even if the virtual buffer capacity is exceeded with such compression.
REFERENCES:
patent: 5500673 (1996-03-01), Zhou
patent: 5548322 (1996-08-01), Zhou
patent: 5550581 (1996-08-01), Zhou
patent: 5596352 (1997-01-01), Zhou
patent: 5852669 (1998-12-01), Eleftheriadis et al.
patent: 5959672 (1999-09-01), Sasaki
A. Ortega--Ph.D. Thesis, Columbia University; pp. 31-55.
"MPEG-4 Video Verification Model: A video encoding/decoding algorithm based on content representation" by T. Ebrahimi; Signal Processing Laboratory, Swiss Federal Institute of Technology; Lausanne, Switzerland; pp. 367-384.
"MPEG-4 Video Verification Model (VM 10.0)"; pp. 20-35.
"ITU Standardisation of Very Low Bitrate Video Coding Algorithms" by K. Rijkse; PTT Research, The Netherlands; Signal Processing: Image Communciation 7 (1995) pp. 553-565.
"Optimal Trellis-Based Buffered Compression and Fast Approximations" by Ortega et al; IEEE Transations on Image Processing, vol. 3, No. 1, Jan. 1994; pp. 26-40.
"Optimal Shape Coding Under Buffer Constraints" by Lee et al; Department of Electrical Engineering and Columbia New Media Technology Center, Columbia University New York; (IEEE-ICIP98).
Eleftheriadis Alexandros
Lee Jae-Boom
Britton Howard
Diep Nhon T
The Trustees of Columbia University in the City of New York
LandOfFree
Method to control the generated bit rate in MPEG-4 shape coding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method to control the generated bit rate in MPEG-4 shape coding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to control the generated bit rate in MPEG-4 shape coding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1790273