Patent US6611296B1 successfully refreshed from Google Patents.
US6611296B1
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Video signal enhancement
Assignee: Koninklijke Philips NV
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Filing: 2000-07-27
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Granted: 2003-08-26
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Expires: 2020-07-27
Abstract
Abstract In a video signal enhancement method, a video signal (Y) is histogram-based processed to obtain a histogram-processed video signal (Y′), and a sharpness of the histogram-processed video signal (Y′) is enhanced to obtain an output video signal (Y″) in dependence upon a sharpness enhancement control signal (CS) derived from at least the histogram-processed video signal (Y′). Advantageously, the sharpness enhancement control signal (CS) represents a derivative of the histogram-processed video signal (Y′).
Inventors
- 👤 Michel Wouter Nieuwenhuizen
- 👤 Marina Marie Pierre Nicolas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:18
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/40; H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N9/00; H04N9/77; H04N9/64; H04N9/68
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A method of video signal enhancement, comprising the steps: histogram-based processing a video signal to obtain a histogram-processed video signal; and enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing step includes the steps: deriving a sharpness enhancement control signal from at least said histogram-processed video signal, said sharpness enhancement control signal representing a derivative of said histogram-processed video signal; and processing said histogram-processed video signal in dependence on the sharpness enhancement control signal to obtain said output video signal.
Claim 2
Independent Claim
89 words
A method of video signal enhancement, comprising the steps: histogram-based processing a video signal to obtain a histogram-processed video signal; and enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing step includes the steps: deriving a sharpness enhancement control signal from at least said histogram-processed video signal, said sharpness enhancement control signal representing a derivative of said histogram-processed video signal; and processing said histogram-processed video signal in dependence on the sharpness enhancement control signal to obtain said output video signal.
Claim 3
Dependent Claim
47 words
The method as claimed in claim 1 , wherein said sharpness enhancement control signal deriving step includes the step: using two subsequent outputs of a differential look-up table used in the histogram-based processing step, to obtain an estimate of a local gain for a current luminance pixel.
Claim 4
Dependent Claim
23 words
The method as claimed in claim 1 , wherein the processing step includes the step: spatially low-pass filtering the sharpness enhancement control signal.
Claim 5
Dependent Claim
97 words
A video signal enhancement device, comprising: means for histogram-based processing a video signal to obtain a histogram-processed video signal; and means for enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing means comprises: means for deriving a sharpness enhancement control signal from at least said histogram-processed video signal, said deriving means forming a derivative of said histogram-processed video signal to represent said sharpness enhancement control signal; and means for processing said histogram-processed video signal in dependence on said sharpness enhancement control signal to obtain said output video signal.
Claim 6
Dependent Claim
97 words
A video signal enhancement device, comprising: means for histogram-based processing a video signal to obtain a histogram-processed video signal; and means for enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing means comprises: means for deriving a sharpness enhancement control signal from at least said histogram-processed video signal, said deriving means forming a derivative of said histogram-processed video signal to represent said sharpness enhancement control signal; and means for processing said histogram-processed video signal in dependence on said sharpness enhancement control signal to obtain said output video signal.
Claim 7
Dependent Claim
31 words
A video signal display apparatus, comprising: the video signal enhancement device as claimed in claim 4 ; and a display device coupled to an output of the video signal enhancement device.
Claim 8
Independent Claim
91 words
A method of video signal enhancement, comprising the steps: histogram-based processing a video signal to obtain a histogram-processed video signal; and enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing step includes the steps: deriving a sharpness enhancement control signal from at least said histogram-processed video signal; and processing said histogram-processed video signal in dependence on the sharpness enhancement control signal to obtain said output video signal, wherein the processing step includes the step: spatially low-pass filtering the sharpness enhancement control signal.
Claim 9
Independent Claim
91 words
A method of video signal enhancement, comprising the steps: histogram-based processing a video signal to obtain a histogram-processed video signal; and enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing step includes the steps: deriving a sharpness enhancement control signal from at least said histogram-processed video signal; and processing said histogram-processed video signal in dependence on the sharpness enhancement control signal to obtain said output video signal, wherein the processing step includes the step: spatially low-pass filtering the sharpness enhancement control 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) | 2006-08-25 | 2007-02-24 | 2007-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-25 | 2011-02-24 | 2011-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-25 | 2015-02-24 | 2015-08-26 | $7700.00 | Window Closed / Lapsed |