Patent US5309232A successfully refreshed from Google Patents.
US5309232A
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Dynamic bit allocation for three-dimensional subband video coding
Assignee: Nokia Bell Labs
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Filing: 1993-07-16
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Granted: 1994-05-03
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Expires: 2013-07-16
Abstract
Abstract The present invention provides a method of coding a set of multi-level signals, such as video signals. The method comprises filtering the set of multi-level signals into one or more sets of multi-level sub-band signals; allocating a first quantity of bits for use in coding a first set of sub-band signals; coding the first set of multi-level sub-band signals using zero or more of the first quantity of allocated bits; allocating a second quantity of bits for use in coding a second set of sub-band signals, the second quantity of bits comprising zero or more of the first quantity of bits not used in coding the first set of multi-level sub-band signals; and coding the second set of multi-level sub-band signals using zero or more of the second quantity of allocated bits. Three examples of the method are provided. A hardware implementation involving the use of digital signal processors operating in parallel is also provided.
Inventors
- 👤 John Hartung
- 👤 Arnaud E. Jacquin
- 👤 Thomas A. Michel
- 👤 Christine I. Podilchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:26
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/503; H04N19/507; H04N19/10; H04N19/102; H04N19/117; H04N19/124; H04N19/126; H04N19/132; H04N19/134; H04N19/136; H04N19/14; H04N19/169; H04N19/17; H04N19/176; H04N19/18; H04N19/182; H04N19/186; H04N19/189; H04N19/192; H04N19/44; H04N19/46; H04N19/60; H04N19/61; H04N19/62; H04N19/63; H04N19/90; H04N19/94; H04N19/115; H04N19/146; H04N19/152; H04N19/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
162 words
A method of coding an image signal sequence, the image signal sequence comprising a plurality of image signals, an image signal comprising a set of pixel signals, the method comprising the steps of: filtering the image signal sequence into a plurality of sets of sub-band pixel signals; coding one or more pixel signals of a first set of sub-band pixel signals using one or more bits of a first quantity of bits, wherein each bit of the first quantity of bits is available for coding the first set of sub-band pixel signals; providing a second quantity of bits for use in coding a second set of sub-band pixel signals, the second quantity of bits comprising one or more bits of the first quantity of bits not used in coding the first set of sub-band pixel signals; and coding one or more pixel signals of the second set of sub-band pixel signals using one or more bits of the second quantity of bits.
Claim 2
Independent Claim
162 words
A method of coding an image signal sequence, the image signal sequence comprising a plurality of image signals, an image signal comprising a set of pixel signals, the method comprising the steps of: filtering the image signal sequence into a plurality of sets of sub-band pixel signals; coding one or more pixel signals of a first set of sub-band pixel signals using one or more bits of a first quantity of bits, wherein each bit of the first quantity of bits is available for coding the first set of sub-band pixel signals; providing a second quantity of bits for use in coding a second set of sub-band pixel signals, the second quantity of bits comprising one or more bits of the first quantity of bits not used in coding the first set of sub-band pixel signals; and coding one or more pixel signals of the second set of sub-band pixel signals using one or more bits of the second quantity of bits.
Claim 3
Dependent Claim
38 words
The method of claim 1 further comprising the step of generating a first signal reflecting that one or more sub-band pixel signals of said first set may be represented by one or more previously decoded sub-band pixel signals.
Claim 4
Dependent Claim
41 words
The method of claim 2 wherein the generating step comprises the step of comparing one or more sub-band pixel signals with one or more previous sub-band pixel signals to determine whether a difference between the compared signals satisfies an error criterion.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein the error criterion is based on the sub-band corresponding to the compared sub-band pixel signals.
Claim 6
Dependent Claim
34 words
The method of claim 1 wherein the sub-band corresponding to the first set of sub-band pixel signals has a greater perceptual significance than the sub-band corresponding to the second set of sub-band pixel signals.
Claim 7
Dependent Claim
27 words
The method of claim 5 wherein the sub-band corresponding to the first set of sub-band pixel signals reflects low spatial frequencies of the set of pixel signals.
Claim 8
Dependent Claim
55 words
The method of claim 1 wherein the step of coding one or more pixel signals of the first set of sub-band pixel signals comprises the step of determining which one or more sub-band pixel signals of said first set are more perceptually significant relative to one or more other sub-band pixels of said first set.
Claim 9
Independent Claim
167 words
An apparatus for coding an image signal sequence, the image signal sequence comprising a plurality of image signals, an image signal comprising a set of pixel signals, the apparatus comprising: means for filtering the image signal sequence into a plurality of sets of sub-band pixel signals; means for coding one or more pixel signals of a first set of sub-band pixel signals using one or more bits of a first quantity of bits, wherein each bit of the first quantity of bits is available for coding the first set of sub-band pixel signals; means for providing a second quantity of bits for use in coding a second set of sub-band pixel signals, the second quantity of bits comprising one or more bits of the first quantity of bits not used in coding the first set of sub-band pixel signals; and means for coding one or more pixel signals of the second set of sub-band pixel signals using one or more bits of the second quantity of bits.
Claim 10
Independent Claim
167 words
An apparatus for coding an image signal sequence, the image signal sequence comprising a plurality of image signals, an image signal comprising a set of pixel signals, the apparatus comprising: means for filtering the image signal sequence into a plurality of sets of sub-band pixel signals; means for coding one or more pixel signals of a first set of sub-band pixel signals using one or more bits of a first quantity of bits, wherein each bit of the first quantity of bits is available for coding the first set of sub-band pixel signals; means for providing a second quantity of bits for use in coding a second set of sub-band pixel signals, the second quantity of bits comprising one or more bits of the first quantity of bits not used in coding the first set of sub-band pixel signals; and means for coding one or more pixel signals of the second set of sub-band pixel signals using one or more bits of the second quantity of bits.
Claim 11
Dependent Claim
33 words
The apparatus of claim 8 further comprising means for generating a first signal reflecting that one or more sub-band pixel signals may be represented by one or more previously decoded sub-band pixel signals.
Claim 12
Dependent Claim
41 words
The apparatus of claim 9 wherein the means for generating comprises means for comparing one or more sub-band pixel signals with one or more previous sub-band pixel signals to determine whether a difference between the compared signals satisfies an error criterion.
Claim 13
Dependent Claim
21 words
The apparatus of claim 10 wherein the error criterion is based on the sub-band corresponding to the compared sub-band pixel signals.
Claim 14
Dependent Claim
34 words
The apparatus of claim 8 wherein the sub-band corresponding to the first set of sub-band pixel signals has a greater perceptual significance than the sub-band corresponding to the second set of sub-band pixel signals.
Claim 15
Dependent Claim
27 words
The apparatus of claim 12 wherein the sub-band corresponding to the first set of sub-band pixel signals reflects low spatial frequencies of the set of pixel signals.
Claim 16
Dependent Claim
55 words
The apparatus of claim 8 wherein the means for coding one or more pixel signals of the first set of sub-band pixel signals comprises means for determining which one or more sub-band pixel signals of said first set are more perceptually significant relative to one or more other sub-band pixel signals of said first set.
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| 3.5 Years (Year 4) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
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| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |