US5495292A
Expired / Lapsed
US
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Inter-frame wavelet transform coder for color video compression
Assignee: Verizon Patent and Licensing Inc
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Filing: 1993-09-03
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Granted: 1996-02-27
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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 15:09
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.
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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 |