Patent US5682204A successfully refreshed from Google Patents.
US5682204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video encoder which uses intra-coding when an activity level of a current macro-block is smaller than a threshold level
Assignee: Avago Technologies International Sales Pte Ltd
•
Filing: 1995-12-26
•
Granted: 1997-10-28
•
Expires: 2015-12-26
Abstract
Abstract A rate control algorithm for an MPEG-2 compliant encoder is described. The rate control algorithm has embodiments useful for constant bit rate and variable bit rate encoding. In particular, the invention relates to a quantization biased, activity based inter/intra decision.
Inventors
- 👤 K. Metin Uz
- 👤 Aaron Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:34
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/42; H04N19/436; H04N19/10; H04N19/102; H04N19/103; H04N19/107; H04N19/134; H04N19/142; H04N19/146; H04N19/147; H04N19/149; H04N19/15; H04N19/60; H04N19/61; H04N19/152; H04N19/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
In an encoder for coding a sequence of video frames to generate a compressed bitstream, a method for determining whether to use intra-coding or inter-coding to code a macroblock in a frame, said method comprising the steps of coding said macroblock in said encoder using intracoding: (1) if an intra-activity of said macroblock is smaller than a threshold, (2) if a displaced frame difference activity of said macroblock is larger than said intra-activity of said macroblock plus an intra-bias of said macroblock, wherein said intra-bias of said macroblock is a function of a quantization scale factor utilized by said encoder to code said macroblock, said intra-bias of said macroblock increasing with increasing quantization scale factor.
Claim 2
Dependent Claim
115 words
In an encoder for coding a sequence of video frames to generate a compressed bitstream, a method for determining whether to use intra-coding or inter-coding to code a macroblock in a frame, said method comprising the steps of coding said macroblock in said encoder using intracoding: (1) if an intra-activity of said macroblock is smaller than a threshold, (2) if a displaced frame difference activity of said macroblock is larger than said intra-activity of said macroblock plus an intra-bias of said macroblock, wherein said intra-bias of said macroblock is a function of a quantization scale factor utilized by said encoder to code said macroblock, said intra-bias of said macroblock increasing with increasing quantization scale factor.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said intra-bias of said macroblock is proportional to the product of said quantization scale factor and said intra-activity of said macroblock.
References Cited (Backward Citations)
US5063608A
Cited
US5107345A
Cited
US5461679A
Cited
US5400087A
Cited
US5596659A
Cited
US5526052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-27 | 2001-04-28 | 2001-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-27 | 2005-04-28 | 2005-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-27 | 2009-04-28 | 2009-10-28 | $7700.00 | Window Closed / Lapsed |