US6445823B1
Expired / Lapsed
US
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Image compression
Assignee: Texas Instruments Inc
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Filing: 1997-03-12
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Granted: 2002-09-03
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Expires: 2017-03-12
Abstract
Abstract A method of image encoding using subband decomposition followed by plus zerotree coding with a symbol replacement for significant coefficients.
Inventors
- 👤 Jie Liang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:30
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/65; H04N19/68; H04N19/60; H04N19/63; H04N19/64; H04N19/647; H04N19/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A method of encoding an image, comprising the steps of: (a) decomposing an image into subarrays of coefficients by lowpass and highpass filtering and subsampling; (b) encoding the subarrays with a zerotree coding including a symbol replacement for significant coefficients, wherein said symbol is evaluated as zero for threshold comparison but is not coded.
Claim 2
Independent Claim
54 words
A method of encoding an image, comprising the steps of: (a) decomposing an image into subarrays of coefficients by lowpass and highpass filtering and subsampling; (b) encoding the subarrays with a zerotree coding including a symbol replacement for significant coefficients, wherein said symbol is evaluated as zero for threshold comparison but is not coded.
References Cited (Backward Citations)
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Cited
US5748786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-09-02 | 2006-03-04 | 2006-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-02 | 2010-03-04 | 2010-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-02 | 2014-03-04 | 2014-09-03 | $7700.00 | Window Closed / Lapsed |