US5859667A
Expired / Lapsed
US
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Hierarchical encoding and decoding apparatus for a digital image signal
Assignee: Sony Corp
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Filing: 1996-10-15
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Granted: 1999-01-12
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Expires: 2016-10-15
Abstract
Abstract In a hierarchical encoding apparatus, predictors each including a look-up table are used to form predicted signals for respective hierarchical levels. The difference between the predicted signal and the original signal forms the differential signal for the higher hierarchical levels. The look-up table contains either predictive coefficients which are used as weights for pixels of a signal in one hierarchical level to produce a signal at a higher hierarchical level, or representative values which are combined with a dynamic range and redundant component in a set of pixels of a signal in one hierarchical level to produce a signal at a higher hierarchical level. The values in the look-up table are obtained from representative images.
Inventors
- 👤 Tetsujiro Kondo
- 👤 Yasuhiro Fujimori
- 👤 Takeharu Nishikata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:44
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/30; H04N19/90; H04N19/94; H04N19/60; H04N19/63; H04N19/64; H04N19/645; H04N19/10; H04N19/102; H04N19/61
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
An apparatus for encoding a first digital image signal having a first resolution, comprising: first filtering means for filtering said first digital image signal to provide a second digital image signal having a second resolution which is lower than said first resolution; second filtering means for filtering said second digital image signal to provide a third digital image signal having a third resolution which is lower than said second resolution; predicting means, including class categorizing means, for processing reference pixels of said third digital image signal to produce a class code and to produce a predicted signal at said first resolution from said reference pixels and said class code; and means for subtracting said predicted signal from said first digital image signal to produce a differential signal.
Claim 2
Independent Claim
127 words
An apparatus for encoding a first digital image signal having a first resolution, comprising: first filtering means for filtering said first digital image signal to provide a second digital image signal having a second resolution which is lower than said first resolution; second filtering means for filtering said second digital image signal to provide a third digital image signal having a third resolution which is lower than said second resolution; predicting means, including class categorizing means, for processing reference pixels of said third digital image signal to produce a class code and to produce a predicted signal at said first resolution from said reference pixels and said class code; and means for subtracting said predicted signal from said first digital image signal to produce a differential signal.
Claim 3
Dependent Claim
20 words
An apparatus according to claim 1, further comprising means for encoding said differential signal to produce a compressed image signal.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 1, further comprising means for encoding said third digital image signal to produce a compressed image signal.
Claim 5
Dependent Claim
24 words
An apparatus according to claim 1, wherein said reference pixels are adjacent in at least one of a spatial dimension and a temporal dimension.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1, wherein said class categorizing means is operable to compress said reference pixels to produce said class code.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 1, further comprising means for transmitting said differential signal and said third digital image signal.
Claim 8
Dependent Claim
51 words
An apparatus according to claim 1, wherein said predicting means includes memory means for storing plural values and for reading out at least one value corresponding to said class code, and combining means for combining the at least one read out value and said reference pixels to generate said predicted signal.
Claim 9
Dependent Claim
46 words
An apparatus according to claim 7, wherein said memory means stores predictive coefficients, and said combining means multiplies the predictive coefficients read out from said memory means by said reference pixels and adds the product of the multiplications to produce a pixel of said predicted signal.
Claim 10
Independent Claim
160 words
An apparatus for decoding a first digital image signal having a first resolution, said apparatus receiving said first digital image signal and at least one additional digital image signal having a second resolution which is lower than said first resolution, said apparatus comprising: first predicting means including class categorizing means for processing said at least one additional digital image signal to produce a class code and to produce a first predicted signal having a resolution which is higher than said second resolution, said first predicted signal being produced from said at least one additional digital image signal and said class code; second predicting means, including class categorizing means, for processing said first predicted signal to produce another class code and to produce a second predicted signal at said first resolution from said first predicted signal and said another class code; and means for adding said first digital image signal and said second predicted signal to produce a decoded output signal.
Claim 11
Independent Claim
160 words
An apparatus for decoding a first digital image signal having a first resolution, said apparatus receiving said first digital image signal and at least one additional digital image signal having a second resolution which is lower than said first resolution, said apparatus comprising: first predicting means including class categorizing means for processing said at least one additional digital image signal to produce a class code and to produce a first predicted signal having a resolution which is higher than said second resolution, said first predicted signal being produced from said at least one additional digital image signal and said class code; second predicting means, including class categorizing means, for processing said first predicted signal to produce another class code and to produce a second predicted signal at said first resolution from said first predicted signal and said another class code; and means for adding said first digital image signal and said second predicted signal to produce a decoded output signal.
Claim 12
Dependent Claim
31 words
An apparatus according to claim 9, further comprising means for decoding at least two encoded digital image signals to respectively produce said first and at least one additional digital image signals.
Claim 13
Dependent Claim
59 words
An apparatus according to claim 9, wherein each of said predicting means includes memory means for storing plural values and for reading out at least one value corresponding to the respectively produced class code, and means for generating a respective one of said first and second predicted signals as a function of the at least one read out value.
Claim 14
Dependent Claim
27 words
An apparatus according to claim 9, further comprising means for receiving said first digital image signal and said at least one additional digital image signal transmitted thereto.
Claim 15
Dependent Claim
36 words
An apparatus according to claim 9, wherein said at least one additional digital image signal includes a plurality of reference pixels which are adjacent in at least one of a spatial dimension and a temporal dimension.
Claim 16
Dependent Claim
35 words
An apparatus according to claim 13, wherein the class categorizing means of each of said first and second predicting means is operable to compress said plurality of reference pixels to produce said respective class code.
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) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |