US6847738B1
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Sharpness enhancement
Assignee: Funai Electric Co Ltd
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Filing: 2000-01-14
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Granted: 2005-01-25
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Expires: 2020-01-14
Abstract
Abstract In a method of sharpness enhancement, an input signal (s) is filtered (HLHP, VLHP) to obtain a filtered signal (z x , z y ), the filtered signal is multiplied (M 2 , M 3 ) by a controllable fraction (c x , c y ) to obtain multiplied signals, and the multiplied signals are added (A 2 ) to the input signal (s). The controllable fraction (c x , c y ) is generated by a non-linear function (HCF, VCF).
Inventors
- 👤 Gaetano Scognamiglio
- 👤 Andrea Rizzi
- 👤 Luigi Albani
- 👤 Giovanni Ramponi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:53
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N19/00; H04N19/50; H04N19/503; H04N19/51; H04N19/527; H04N19/85; H04N19/86; H04N5/20; H04N5/205; H04N5/208; H04N5/21
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
A method of sharpness enhancement, the method comprising the steps: filtering an input signal to form a filtered signal; multiplying the filtered signal by a controllable fraction to form a multiplied signal; and adding the multiplied signal to the input signal; wherein the controllable fraction depends on a non-linear function, and wherein the filtering is a spatial filtering, and the method further comprises the steps: temporally filtering the input signal to form a temporally filtered signal; and adding the temporally filtered signal to the input signal.
Claim 2
Independent Claim
86 words
A method of sharpness enhancement, the method comprising the steps: filtering an input signal to form a filtered signal; multiplying the filtered signal by a controllable fraction to form a multiplied signal; and adding the multiplied signal to the input signal; wherein the controllable fraction depends on a non-linear function, and wherein the filtering is a spatial filtering, and the method further comprises the steps: temporally filtering the input signal to form a temporally filtered signal; and adding the temporally filtered signal to the input signal.
Claim 3
Dependent Claim
18 words
The method as claimed in claim 1 , wherein the controllable fraction depends on an edge sensing function.
Claim 4
Dependent Claim
26 words
The method as claimed in claim 2 , wherein the controllable fraction is smaller than its maximum value for edges smaller than a first threshold value.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 2 , wherein the controllable fraction is smaller than its maximum value for edges exceeding a second threshold value.
Claim 6
Dependent Claim
18 words
The method as claimed in claim 1 , wherein the non-linear function depends on a thin line detection.
Claim 7
Dependent Claim
20 words
The method as claimed in claim 5 , wherein the thin line detection is carried out on the filtered signal.
Claim 8
Dependent Claim
15 words
The method as claimed in claim 2 , wherein the edge sensing function is variance-based.
Claim 9
Dependent Claim
22 words
The method as claimed in claim 7 , wherein the controllable fraction is negative for signal variations smaller than a certain threshold.
Claim 10
Independent Claim
89 words
A method of sharpness enhancement, the method comprising the steps: filtering an input signal to form a filtered signal; multiplying the filtered signal by a controllable fraction to form a multiplied signal; and adding the multiplied signal to the input signal; wherein the controllable fraction depends on a non-linear function, and wherein the method further comprises the steps: detecting a blocking and/or ringing effect including comparing mean values of adjacent pixel windows; and detecting a block size based on an autocorrelation of a vector indicating blocking and/or ringing effects.
Claim 11
Independent Claim
89 words
A method of sharpness enhancement, the method comprising the steps: filtering an input signal to form a filtered signal; multiplying the filtered signal by a controllable fraction to form a multiplied signal; and adding the multiplied signal to the input signal; wherein the controllable fraction depends on a non-linear function, and wherein the method further comprises the steps: detecting a blocking and/or ringing effect including comparing mean values of adjacent pixel windows; and detecting a block size based on an autocorrelation of a vector indicating blocking and/or ringing effects.
Claim 12
Dependent Claim
29 words
The method as claimed in claim 9 , wherein the blocking and/or ringing effect detecting step further includes comparing variances of the adjacent pixel windows to a threshold value.
Claim 13
Independent Claim
80 words
A device for sharpness enhancement, the device comprising: means for spatially filtering an input signal to form a filtered signal; means for multiplying the filtered signal by a controllable fraction to form a multiplied signal; means for adding the multiplied signal to the input signal; means for generating the controllable fraction using a non-linear functions; means for temporally filtering the input signal to form a temporally filtered signal; and means for adding the temporally filtered signal to the input signal.
Claim 14
Independent Claim
80 words
A device for sharpness enhancement, the device comprising: means for spatially filtering an input signal to form a filtered signal; means for multiplying the filtered signal by a controllable fraction to form a multiplied signal; means for adding the multiplied signal to the input signal; means for generating the controllable fraction using a non-linear functions; means for temporally filtering the input signal to form a temporally filtered signal; and means for adding the temporally filtered signal to the input signal.
Claim 15
Dependent Claim
22 words
A television apparatus, comprising: a device for sharpness enhancement as claimed in claim 11 ; and means for displaying the sharpened 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) | 2008-01-25 | 2008-07-26 | 2009-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-01-25 | 2012-07-26 | 2013-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-01-25 | 2016-07-26 | 2017-01-25 | $7700.00 | Window Closed / Lapsed |