Patent US5495292A successfully refreshed from Google Patents.
US5495292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inter-frame wavelet transform coder for color video compression
Assignee: Verizon Patent and Licensing Inc
•
Filing: 1993-09-03
•
Granted: 1996-02-27
•
Expires: 2013-09-03
Abstract
Abstract A video coding scheme based on wavelet representation performs motion compensation in the wavelet domain rather than spatial domain. This inter-frame wavelet transform coding scheme preferably uses a variable-size multi-resolution motion compensation (MRMC) prediction scheme. The MRMC scheme produces displaced residual wavelets (DRWs). An optimal bit allocation algorithm produces a bit map for each DRW, and each DRW is then adaptively quantized with its respective bit map. Each quantized DRW is then coded into a bit stream.
Inventors
- 👤 Ya-Qin Zhang
- 👤 Sohail Zafar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:57
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/134; H04N19/146; H04N19/147; H04N19/149; H04N19/169; H04N19/187; H04N19/189; H04N19/19; H04N19/48; H04N19/50; H04N19/503; H04N19/51; H04N19/53; H04N19/60; H04N19/61; H04N19/619; H04N19/63; H04N19/115; H04N19/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
A method of coding a video signal frame f(t), comprising the steps of: deriving a wavelet representation of a signal defined by a plurality of wavelets each corresponding to a subframe having a resolution; estimating motion vectors for each of said plurality of wavelets to produce a set of displaced residual wavelets; optimally assigning a given number of bits to each of said displaced residual wavelets to produce a respective bit map for each of aid displaced residual wavelets; adaptively quantizing each of said displaced residual wavelets using its respective bit map; and coding each quantized displaced residual wavelet into a bit stream wherein the step of estimating motion vectors includes the steps of: dividing each subframe into a see of blocks defining a grid, wherein the size of each block is based on the associated resolution of the respective subframe; calculating a motion vector, relative to a previous frame, for each block of a lowest resolution subframe; calculating motion vectors of each block of other subframes, comprising the steps of scaling a motion vector corresponding to a respective block of said lowest resolution subframe, and calculating a motion vector, relative to the previous frame, for a block under motion compensation using the scaled motion vector.
Claim 2
Independent Claim
206 words
A method of coding a video signal frame f(t), comprising the steps of: deriving a wavelet representation of a signal defined by a plurality of wavelets each corresponding to a subframe having a resolution; estimating motion vectors for each of said plurality of wavelets to produce a set of displaced residual wavelets; optimally assigning a given number of bits to each of said displaced residual wavelets to produce a respective bit map for each of aid displaced residual wavelets; adaptively quantizing each of said displaced residual wavelets using its respective bit map; and coding each quantized displaced residual wavelet into a bit stream wherein the step of estimating motion vectors includes the steps of: dividing each subframe into a see of blocks defining a grid, wherein the size of each block is based on the associated resolution of the respective subframe; calculating a motion vector, relative to a previous frame, for each block of a lowest resolution subframe; calculating motion vectors of each block of other subframes, comprising the steps of scaling a motion vector corresponding to a respective block of said lowest resolution subframe, and calculating a motion vector, relative to the previous frame, for a block under motion compensation using the scaled motion vector.
References Cited (Backward Citations)
US5206723A
Cited
US5067015A
Cited
US5014134A
Cited
WO1993009637A1
Cited
US5347479A
Cited
US5351086A
Cited
US5309232A
Cited
US5253058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |