US5233434A
Expired / Lapsed
US
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Method and system for encoding and decoding video data
Assignee: Victor Company of Japan Ltd
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Filing: 1990-02-27
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Granted: 1993-08-03
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Expires: 2010-02-27
Abstract
Abstract An original image signal is encoded into an image code signal of a predetermined format through an approximation process on colors. A first luminance component is derived from the image code signal. A second luminance component is derived from the original image signal. A difference between the first luminance component and the second luminance component is derived. The difference is converted into a luminance corrective signal. The image code signal and the luminance corrective signal are transmitted via a common transmission line. In a decoder, the luminance corrective signal is decoded to a luminance difference signal, which is added to an image signal decoded from the image code signal.
Inventors
- 👤 Tsuneo Furuki
- 👤 Yasuo Ito
- 👤 Kazuo Hikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:05
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/8205; H04N9/8233; H04N9/8244; H04N9/797; H04N9/804; H04N9/806; H04N9/8063; H04N9/8066; H04N19/00; H04N19/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A compact disk graphics system comprising: a first encoder for compressing color information in a color image signal and encoding said color image signal into a discrete number of first codes; means for deriving a first luminance component from the first codes; means for deriving a second luminance component from the color image signal; means for deriving a difference signal from the first luminance component and the second luminance component; means for generating a luminance level corrective signal in response to the difference signal for correcting a level of luminance components of the first codes; a second encoder encoding the first codes into second codes in a predetermined compact disk signal format and for encoding the luminance level corrective signal into third codes in the compact disk signal format; and means for recording the second codes and the third codes into the compact disk.
Claim 2
Dependent Claim
144 words
A compact disk graphics system comprising: a first encoder for compressing color information in a color image signal and encoding said color image signal into a discrete number of first codes; means for deriving a first luminance component from the first codes; means for deriving a second luminance component from the color image signal; means for deriving a difference signal from the first luminance component and the second luminance component; means for generating a luminance level corrective signal in response to the difference signal for correcting a level of luminance components of the first codes; a second encoder encoding the first codes into second codes in a predetermined compact disk signal format and for encoding the luminance level corrective signal into third codes in the compact disk signal format; and means for recording the second codes and the third codes into the compact disk.
Claim 3
Dependent Claim
73 words
The compact disk graphics system of claim 1 further comprising: means for reproducing the second codes and the third codes from the compact disk; means for decoding the reproduced second codes and the reproduced third codes into a decoded image signal and a decoded luminance level corrective signal, respectively; and means for correcting the decoded image signal in response to the decoded luminance level corrective signal and thereby generating a luminance-corrected image signal.
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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |