US4829378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sub-band coding of images with low computational complexity
Assignee: Iconectiv LLC
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Filing: 1988-06-09
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Granted: 1989-05-09
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Expires: 2008-06-09
Abstract
Abstract A class of filters for use in connection with the sub-band coding of a video signal is disclosed. The filters are of short length, symmetric and have coefficients in the form of an integer divided by a power of two. The filters may be implemented with a minimum of circuitry and permit exact reconstruction of a sub-band coded video signal.
Inventors
- 👤 Didier J. LeGall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:23
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/63; H03; H03H; H03H17/00; H03H17/02; H03H17/0248; H03H17/0264; H03H17/0266
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
A method for coding video signals comprising the steps of dividing said video signal into a plurality of sub-band signals by applying said video signal to a first plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are in the form of an integer divided by a power of two, and reconstructing said video signal by applying said sub-band signals to a second plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are of the form of an integer divided by a power of two.
Claim 2
Independent Claim
113 words
A method for coding video signals comprising the steps of dividing said video signal into a plurality of sub-band signals by applying said video signal to a first plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are in the form of an integer divided by a power of two, and reconstructing said video signal by applying said sub-band signals to a second plurality of filters each of which is a symmetric finite impulse response filter comprising between three and eight stages and having coefficients which are of the form of an integer divided by a power of two.
Claim 3
Dependent Claim
19 words
The method fo claim 1 wherein said sub-band signals are decimated after processing by said first plurality of filters.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein said sub-band signals are interpolated before being processed by said second plurality of filters.
Claim 5
Dependent Claim
74 words
The method of claim 1 wherein said first plurality of filters comprises at least one pair of filters having transfer functions H 0 (z)H 1 (z) and said second plurality of filters comprises at least one pair of filters having transfer functions G 0 (z)=H 1 (-z) and G 1 (z)=-H 0 (-z) whereby said second plurality of filters serves to produce a substantially exact reconstruction of said video signal from said sub-band signals.
Claim 6
Dependent Claim
35 words
The method of claim 1 wherein said first plurality of filters comprises three pairs of filters to divide said video signal into four sub-bands and said second plurality of filters comprises three pairs of filters.
Claim 7
Independent Claim
79 words
A device for coding a video signal comprising at least one bank of filters for receiving said video signal and for analyzing said video signal into a plurality of sub-band signals, each of said filters being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two, means for decimating said sub-band signals, and means for separatley coding each of said sub-band signals.
Claim 8
Independent Claim
79 words
A device for coding a video signal comprising at least one bank of filters for receiving said video signal and for analyzing said video signal into a plurality of sub-band signals, each of said filters being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two, means for decimating said sub-band signals, and means for separatley coding each of said sub-band signals.
Claim 9
Dependent Claim
56 words
The device of claim 6 wherein said device further comprises a second bank of filters for further analyzing said sub-band signals, each of said filters in said second bank being a finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two.
Claim 10
Dependent Claim
110 words
A sub-band coding system for a video signal comprising a first filter bank for analyzing said video signal into a plurality of sub-band signals, each of said filters in said first bank being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two, and a second filter bank for synthesizing said video signal from said sub-band signals, each of said filters in said second bank being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two.
Claim 11
Dependent Claim
110 words
A sub-band coding system for a video signal comprising a first filter bank for analyzing said video signal into a plurality of sub-band signals, each of said filters in said first bank being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two, and a second filter bank for synthesizing said video signal from said sub-band signals, each of said filters in said second bank being a symmetric finite impulse response filter having between three and eight stages and having coefficients in the form of an integer divided by a power of two.
References Cited (Backward Citations)
US4674125A
Cited
US4785348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |