US5771316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fade detection
Assignee: Avago Technologies International Sales Pte Ltd
•
Filing: 1995-12-26
•
Granted: 1998-06-23
•
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 fade detection.
Inventors
- 👤 K. Metin Uz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:35
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/42; H04N19/436; H04N19/10; H04N19/102; H04N19/103; H04N19/107; H04N19/112; H04N19/134; H04N19/136; H04N19/137; H04N19/14; H04N19/142; H04N19/146; H04N19/147; H04N19/149; H04N19/15; H04N19/169; H04N19/17; H04N19/176; H04N19/189; H04N19/192; H04N19/194; H04N19/50; H04N19/503; H04N19/60; H04N19/61; H04N19/152; H04N19/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
In an encoder for encoding a sequence of video frames to generate a compressed bitstream, a method for performing rate control when a fade is detected in said input sequence of video frames, said method comprising the steps of: (1) detecting by said encoder the fade by detecting that a DC luminance value of a set of said frames is smoothly approaching a DC luminance value representative of white or a DC luminance value representative of black, (2) when a fade is detected, coding and allocating bit budgets by said encoder said frames as I frames or P frames but not B frames, and (3) utilizing said bit budgets allocated in accordance with step (2) to code said frames in said fade to generate said compressed bitstream.
Claim 2
Dependent Claim
127 words
In an encoder for encoding a sequence of video frames to generate a compressed bitstream, a method for performing rate control when a fade is detected in said input sequence of video frames, said method comprising the steps of: (1) detecting by said encoder the fade by detecting that a DC luminance value of a set of said frames is smoothly approaching a DC luminance value representative of white or a DC luminance value representative of black, (2) when a fade is detected, coding and allocating bit budgets by said encoder said frames as I frames or P frames but not B frames, and (3) utilizing said bit budgets allocated in accordance with step (2) to code said frames in said fade to generate said compressed bitstream.
Claim 3
Dependent Claim
120 words
In an encoder for encoding a sequence of video frames to generate a compressed bitstream, a method for performing rate control when a fade is detected in said input sequence of video frames, said method comprising the steps of: (1) detecting by said encoder the fade by detecting that a DC luminance value of a set of said frames is smoothly approaching a DC luminance value representative of white or a DC luminance value representative of black, (2) allocating to B frames in said fade a bit budget of a size normally allocated to P frames, and (3) utilizing said bit budget allocated in accordance with step (2) to code said frames in said fade to generate said compressed bitstream.
Claim 4
Dependent Claim
120 words
In an encoder for encoding a sequence of video frames to generate a compressed bitstream, a method for performing rate control when a fade is detected in said input sequence of video frames, said method comprising the steps of: (1) detecting by said encoder the fade by detecting that a DC luminance value of a set of said frames is smoothly approaching a DC luminance value representative of white or a DC luminance value representative of black, (2) allocating to B frames in said fade a bit budget of a size normally allocated to P frames, and (3) utilizing said bit budget allocated in accordance with step (2) to code said frames in said fade to generate said compressed bitstream.
Claim 5
Dependent Claim
23 words
The method of claim 2 wherein for said P frames no motion vectors are utilized by said encoder to generate said compressed bitstream.
Claim 6
Dependent Claim
28 words
The method of claim 2 wherein for said P frames no motion vectors and motion vectors near zero are utilized by said encoder to generate said compressed bitstream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-22 | 2001-12-22 | 2002-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-22 | 2005-12-22 | 2006-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-22 | 2009-12-22 | 2010-06-23 | $7700.00 | Window Closed / Lapsed |