US4802004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Predictive coding system for TV signals
Assignee: KOKUSAI KENSHIN DENWA KK
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Filing: 1987-08-03
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Granted: 1989-01-31
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Expires: 2007-08-03
Abstract
Abstract A predictive TV signal coding system is disclosed, in which a predictive value of a picture element to be coded is obtained from information of an already coded picture element, a representative quantization value of the picture element to be coded is determined in accordance with the magnitude of the predictive value, and a difference value between the representative quantization value and the predictive value is coded for transmission without quantization.
Inventors
- 👤 Shuichi Matsumoto
- 👤 Hitomi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:31
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/503
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A predictive coding method for highly efficient coding image signals such as those of a commercial TV or a conference TV system through utilization of high correlation between adjacent picture elements in a picture, including the steps of: obtaining a predictive value of an instant picture element to be coded after quantization of the instant picture element from information of an already coded picture element, determining a representative quantization value of the instant picture element in accordance with a quantization characteristic predetermined in correspondence to the magnitude of the predictive value, and coding a difference value between the representative quantization value and the predictive value for transmission without other quantization.
Claim 2
Dependent Claim
110 words
A predictive coding method for highly efficient coding image signals such as those of a commercial TV or a conference TV system through utilization of high correlation between adjacent picture elements in a picture, including the steps of: obtaining a predictive value of an instant picture element to be coded after quantization of the instant picture element from information of an already coded picture element, determining a representative quantization value of the instant picture element in accordance with a quantization characteristic predetermined in correspondence to the magnitude of the predictive value, and coding a difference value between the representative quantization value and the predictive value for transmission without other quantization.
Claim 3
Dependent Claim
128 words
A predictive coding system for highly efficient coding signals such as those of a commercial TV or conference TV system through utilization of high correlation between adjacent picture elements in a picture, comprising: first means for obtaining a predictive value of an instant picture element to be coded after quantization of the instant picture element from information of an already coded picture element, second means connected to the first means for determining a representative quantization value of the instant picture element in accordance with a quantization characteristic predetermined in correspondence to the magnitude of the predictive value, and third means connected to the first means and the second means for coding a difference value between the representative quantization value and the predictive value for transmission without other quantization.
Claim 4
Dependent Claim
128 words
A predictive coding system for highly efficient coding signals such as those of a commercial TV or conference TV system through utilization of high correlation between adjacent picture elements in a picture, comprising: first means for obtaining a predictive value of an instant picture element to be coded after quantization of the instant picture element from information of an already coded picture element, second means connected to the first means for determining a representative quantization value of the instant picture element in accordance with a quantization characteristic predetermined in correspondence to the magnitude of the predictive value, and third means connected to the first means and the second means for coding a difference value between the representative quantization value and the predictive value for transmission without other quantization.
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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |