US4721998A
Expired / Lapsed
US
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Method and apparatus for processing color video signals
Assignee: New York Institute of Technology
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Filing: 1986-04-11
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Granted: 1988-01-26
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Expires: 2006-04-11
Abstract
Abstract A method and apparatus is disclosed for improving video signals. High spatial frequency portions of color-representative signals are added to a luminance channel in order to improve the apparent sharpness of images having saturated colors, improve monochrome presentations of color images, and/or reduce the bandwidth necessary to represent color-representative signal components of video signals.
Inventors
- 👤 William E. Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:22
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/646
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
69 words
A method for generating a video luminance signal, comprising the steps of: deriving a plurality of color-representative signals, representative of an image; processing at least one of said plurality of color-representative signals to emphasize the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof; and combining the processed at least one color-representative signal with the other color-representative signals to obtain an output luminance signal.
Claim 2
Independent Claim
69 words
A method for generating a video luminance signal, comprising the steps of: deriving a plurality of color-representative signals, representative of an image; processing at least one of said plurality of color-representative signals to emphasize the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof; and combining the processed at least one color-representative signal with the other color-representative signals to obtain an output luminance signal.
Claim 3
Dependent Claim
49 words
The method as defined by claim 1, further comprising the step of processing of another of said plurality of color-representative signals to attenuate the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof before said another color-representative signal is subjected to said combining step.
Claim 4
Dependent Claim
18 words
The method as defined by claim 2, wherein said another color-representative signal is a blue color component signal.
Claim 5
Dependent Claim
21 words
The method as defined by claim 3, wherein said plurality of color-representative signals comprise red, blue, and green color component signals.
Claim 6
Dependent Claim
20 words
The method as defined by claim 2, wherein said at least one color-representative signal is a red color component signal.
Claim 7
Dependent Claim
18 words
The method as defined by claim 5, wherein said another color-representative signal is a blue color component signal.
Claim 8
Dependent Claim
21 words
The method as defined by claim 6, wherein said plurality of color-representative signals comprise red, blue, and green color component signals.
Claim 9
Dependent Claim
20 words
The method as defined by claim 1, wherein said at least one color-representative signal is a red color component signal.
Claim 10
Independent Claim
49 words
A method for generating video signals, comprising the steps of: deriving a plurality of input color-representative signals, representative of an image; processing at least one of said plurality of input color-representative signals to emphasize the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof;
Claim 11
Independent Claim
49 words
A method for generating video signals, comprising the steps of: deriving a plurality of input color-representative signals, representative of an image; processing at least one of said plurality of input color-representative signals to emphasize the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof;
Claim 12
Dependent Claim
34 words
combining the processed at least one color-representative signal with the other color representative signals to obtain an output luminance signal; and combining said plurality of input color-representative signals to obtain an output chrominance signal.
Claim 13
Dependent Claim
34 words
combining the processed at least one color-representative signal with the other color representative signals to obtain an output luminance signal; and combining said plurality of input color-representative signals to obtain an output chrominance signal.
Claim 14
Dependent Claim
21 words
The method as defined by claim 9, wherein said at least one input color-representative signal is a red color component signal.
Claim 15
Dependent Claim
51 words
The method as defined by claim 9, further comprising the step of processing of another of said plurality of input color-representative signals to attenuate the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof before said another input color-representative signal is subjected to said combining step.
Claim 16
Dependent Claim
19 words
The method as defined by claim 11, wherein said another input color-representative signal is a blue color component signal.
Claim 17
Dependent Claim
22 words
The method as defined by claim 12, wherein said plurality of input color-representative signals comprise red, blue, and green color component signals.
Claim 18
Dependent Claim
21 words
The method as defined by claim 11, wherein said at least one input color-representative signal is a red color component signal.
Claim 19
Dependent Claim
19 words
The method as defined by claim 14, wherein said another input color-representative signal is a blue color component signal.
Claim 20
Dependent Claim
22 words
The method as defined by claim 15, wherein said plurality of input color-representative signals comprise red, blue, and green color component signals.
Claim 21
Independent Claim
72 words
A method for generating an enhanced video luminance signal, comprising the steps of: deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; producing, from at least one of said input color-representative signals, an enhancement signal representative of the high spatial frequency portion of said at least one input color-representative signal; and combining said enhancement signal with said luminance signal to obtain an enhanced luminance signal.
Claim 22
Independent Claim
72 words
A method for generating an enhanced video luminance signal, comprising the steps of: deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; producing, from at least one of said input color-representative signals, an enhancement signal representative of the high spatial frequency portion of said at least one input color-representative signal; and combining said enhancement signal with said luminance signal to obtain an enhanced luminance signal.
Claim 23
Dependent Claim
25 words
The method as defined by claim 17, wherein said input color-representative signals are a function of both a color component signal and a luminance signal.
Claim 24
Dependent Claim
23 words
The method as defined by claim 18, wherein said at least one color-representative signal is in the form of a color difference signal.
Claim 25
Dependent Claim
29 words
The method as defined by claim 17, wherein said at least one input color representative signal is a function of a red color component signal and a luminance signal.
Claim 26
Dependent Claim
35 words
The method as defined by claim 17, further comprising the step of producing, from another of said input color-representative signals, another enhancement signal representative of the high spatial frequency portion of said another color-representative signal.
Claim 27
Dependent Claim
27 words
The method as defined by claim 21, wherein said another input color representative signal is a function of a blue color component signal and a luminance signal.
Claim 28
Independent Claim
79 words
A method for generating video signals, comprising the steps of: deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; producing, from at least one of said input color-representative signals, an enhancement signal representative of the high spatial frequency portion of said at least one color-representative signal; combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and combining said input color-representative signals to obtain a chrominance signal.
Claim 29
Independent Claim
79 words
A method for generating video signals, comprising the steps of: deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; producing, from at least one of said input color-representative signals, an enhancement signal representative of the high spatial frequency portion of said at least one color-representative signal; combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and combining said input color-representative signals to obtain a chrominance signal.
Claim 30
Independent Claim
108 words
A method for generating video signals, comprising the steps of: deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; separating said at least one of said input color-representative signals into an enhancement signal representative of the high spatial frequency portion of said at least one input color-representative signal, and a remaining signal representative of the low spatial frequency portion of said at least one input color-representative signal; combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and combining said remaining signal with the other one or more input color-representative signals to obtain a chrominance signal.
Claim 31
Independent Claim
108 words
A method for generating video signals, comprising the steps of: deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; separating said at least one of said input color-representative signals into an enhancement signal representative of the high spatial frequency portion of said at least one input color-representative signal, and a remaining signal representative of the low spatial frequency portion of said at least one input color-representative signal; combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and combining said remaining signal with the other one or more input color-representative signals to obtain a chrominance signal.
Claim 32
Independent Claim
137 words
A method for generating video signals, comprising the steps of: deriving at least one high resolution luminance signal and at least one low resolution luminance signal representative of a scene; deriving a plurality of high resolution color representative signals and a plurality of low resolution color-representative signals representative of said scene; processing at least one of said high resolution color-representative signals to separate therefrom an enhancement signal representative of the high spatial frequency portion of said at least one high resolution color-representative signal; combining said enhancement signal with said at least one low resolution luminance signal to obtain an enhanced low resolution luminance signal; and combining the remaining portion of said at least one high resolution color-representative signal with the other one or more of the high resolution color-representative signals to obtain a high resolution chrominance signal.
Claim 33
Independent Claim
137 words
A method for generating video signals, comprising the steps of: deriving at least one high resolution luminance signal and at least one low resolution luminance signal representative of a scene; deriving a plurality of high resolution color representative signals and a plurality of low resolution color-representative signals representative of said scene; processing at least one of said high resolution color-representative signals to separate therefrom an enhancement signal representative of the high spatial frequency portion of said at least one high resolution color-representative signal; combining said enhancement signal with said at least one low resolution luminance signal to obtain an enhanced low resolution luminance signal; and combining the remaining portion of said at least one high resolution color-representative signal with the other one or more of the high resolution color-representative signals to obtain a high resolution chrominance signal.
Claim 34
Dependent Claim
87 words
Apparatus for generating video signals, comprising: means for deriving a plurality of input color-representative signals, representative of an image; means for processing at least one of said plurality of input color-representative signals to emphasize the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof; means for combining the processed at least one color-representative signal with the other color representative signals to obtain an output luminance signal; and means for combining said plurality of input color-representative signals to obtain an output chrominance signal.
Claim 35
Dependent Claim
87 words
Apparatus for generating video signals, comprising: means for deriving a plurality of input color-representative signals, representative of an image; means for processing at least one of said plurality of input color-representative signals to emphasize the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof; means for combining the processed at least one color-representative signal with the other color representative signals to obtain an output luminance signal; and means for combining said plurality of input color-representative signals to obtain an output chrominance signal.
Claim 36
Dependent Claim
50 words
Apparatus as defined by claim 26, further comprising means for processing another of said plurality of input color-representative signals to attenuate the high spatial frequency portion thereof with respect to the low spatial frequency portion thereof before said another input color-representative signal is combined with the other input color-representative signals.
Claim 37
Dependent Claim
83 words
Apparatus for generating video signals, comprising: means for deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; means for producing, from at least one of said input color-representative signals, an enhancement signal representative of the high spatial frequency portion of said at least one color-representative signal; means for combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and means for combining said input color-representative signals to obtain a chrominance signal.
Claim 38
Dependent Claim
83 words
Apparatus for generating video signals, comprising: means for deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; means for producing, from at least one of said input color-representative signals, an enhancement signal representative of the high spatial frequency portion of said at least one color-representative signal; means for combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and means for combining said input color-representative signals to obtain a chrominance signal.
Claim 39
Dependent Claim
112 words
Apparatus for generating video signals, comprising: means for deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; means for separating said at least one of said input color-representative signals into an enhancement signal representative of the high spatial frequency portion of said at least one input color-representative signal, and a remaining signal representative of the low spatial frequency portion of said at least one input color-representative signal; means for combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and means for combining said remaining signal with the other one or more input color-representative signals to obtain a chrominance signal.
Claim 40
Dependent Claim
112 words
Apparatus for generating video signals, comprising: means for deriving an input luminance signal and a plurality of input color-representative signals, representative of an image; means for separating said at least one of said input color-representative signals into an enhancement signal representative of the high spatial frequency portion of said at least one input color-representative signal, and a remaining signal representative of the low spatial frequency portion of said at least one input color-representative signal; means for combining said enhancement signal with said input luminance signal to obtain an enhanced luminance signal; and means for combining said remaining signal with the other one or more input color-representative signals to obtain a chrominance signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |