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US4803548A
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Color video image enhancement
Assignee: FFEI Ltd
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Filing: 1987-12-01
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Granted: 1989-02-07
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Expires: 2007-12-01
Abstract
Abstract A method and apparatus for enhancing a video image defined by luminance information and chromaticity information comprises, for a number of selected regions of the image, (a) determining using a microcomputer (22) a statistical relationship between the luminance information and the chromaticity information for the selected region; and, (b) generating modified chromaticity information for at least a portion (1) of the selected region by applying the determined statistical relationship to the luminance information for the said portion.
Inventors
- 👤 Richard A. Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:10
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A method of enhancing a video image defined by luminance information and chromaticity information representing said image as a plurality of regions, the method comprising for each of a number of said selected regions of the image (a) determining a statistical relationship between said luminance information and said chromaticity information for the selected region; and, (b) generating modified chromaticity information for at least a portion of said selected region by applying said determined statistical relationship to said luminance information for the said portion.
Claim 2
Independent Claim
83 words
A method of enhancing a video image defined by luminance information and chromaticity information representing said image as a plurality of regions, the method comprising for each of a number of said selected regions of the image (a) determining a statistical relationship between said luminance information and said chromaticity information for the selected region; and, (b) generating modified chromaticity information for at least a portion of said selected region by applying said determined statistical relationship to said luminance information for the said portion.
Claim 3
Dependent Claim
54 words
A method according to claim 1, wherein said step (a) comprises carrying out a regression analysis to generate a relationship between said luminance (L) and a chrominance coordinate (I) of the form: I=C.sub.0 +ΣC.sub.n F.sub.n (L)+ . . . where F n is a general function series, such as a power series, of L.
Claim 4
Dependent Claim
16 words
A method according to claim 2, wherein a linear relationship is determined between luminance and chromaticity.
Claim 5
Dependent Claim
40 words
A method according to claim 1, wherein step (a) comprises a preliminary step of applying a local averaging process over subsidiary regions within said selected region to reduce said luminance information to the same spatial resolution as said chromaticity information.
Claim 6
Dependent Claim
35 words
A method according to claim 1 for enhancing an image defined by a luminance signal and two chrominance signals, separate relationships being determined in step (a) between said luminance signal and each said chrominance signal.
Claim 7
Dependent Claim
29 words
A method according to claim 1, further comprising, prior to step (b) checking the degree of correlation between the individual chromaticity and luminance values with said determined statistical relationship.
Claim 8
Dependent Claim
86 words
Apparatus for enhancing a video image defined by luminance information and chromaticity information representing said image as a plurality of regions, the apparatus comprising processing means (22) for determining a statistical relationship between said luminance information and said chromaticity information for each of a number of said selected regions of said image; and modified chromaticity information generating means for generating modified chromaticity information for at least a portion of said selected region by applying said determined statistical relationship to said luminance information for the said portion.
Claim 9
Dependent Claim
86 words
Apparatus for enhancing a video image defined by luminance information and chromaticity information representing said image as a plurality of regions, the apparatus comprising processing means (22) for determining a statistical relationship between said luminance information and said chromaticity information for each of a number of said selected regions of said image; and modified chromaticity information generating means for generating modified chromaticity information for at least a portion of said selected region by applying said determined statistical relationship to said luminance information for the said portion.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |