Patent US4979024A successfully refreshed from Google Patents.
US4979024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical contour enhancement suppression circuit
Assignee: Fujifilm Corp
•
Filing: 1989-09-11
•
Granted: 1990-12-18
•
Expires: 2009-09-11
Abstract
Abstract In an arrangement wherein vertical contour enhancement is performed by subtracting a video signal between horizontal scanning lines and applying a white- or black-level signal before or after the contour (edge portion) of an image based on the result of the subtraction operation, the application of the black-level signal is selectively suppressed to diminish unattractive black borders. In another embodiment, application of the black-level signal to portions having a strong red-signal component is selectively suppressed, thereby diminishing unattractive black borders which appear at red portions of a display image. In still another embodiment, application of the black-level signal to portions where the level of an R-Y signal is high is selectively suppressed, thereby diminishing unattractive black borders which appear at red portions of a display image.
Inventors
- 👤 Takeshi Misawa
- 👤 Youichi Sawachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:35
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N9/00; H04N9/64; H04N9/646
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A vertical contour enhancement suppression circuit in system which performs vertical contour enhancement by subtracting a prescribed component of a video signal between horizontal scanning lines and adding a signal representing the result of subtraction to a prescribed component of the video signal, said circuit comprising: means for detecting a portion at which the level of said signal to be added is negative; and means for suppressing the adding processing in response to detection of the portion at which the level of the signal to be added is negative.
Claim 2
Dependent Claim
89 words
A vertical contour enhancement suppression circuit in system which performs vertical contour enhancement by subtracting a prescribed component of a video signal between horizontal scanning lines and adding a signal representing the result of subtraction to a prescribed component of the video signal, said circuit comprising: means for detecting a portion at which the level of said signal to be added is negative; and means for suppressing the adding processing in response to detection of the portion at which the level of the signal to be added is negative.
Claim 3
Dependent Claim
86 words
A vertical contour enhancement suppression circuit in system which performs vertical contour enhancement by subtracting a prescribed component of a video signal between horizontal scanning lines and adding a signal representing the result of subtraction to a prescribed component of the video signal, said circuit comprising: means for detecting a portion at which the level of a red-component signal in said video signal is relatively high; and means for suppressing the adding processing in response to detection of the red-component signal having the relatively high level.
Claim 4
Dependent Claim
86 words
A vertical contour enhancement suppression circuit in system which performs vertical contour enhancement by subtracting a prescribed component of a video signal between horizontal scanning lines and adding a signal representing the result of subtraction to a prescribed component of the video signal, said circuit comprising: means for detecting a portion at which the level of a red-component signal in said video signal is relatively high; and means for suppressing the adding processing in response to detection of the red-component signal having the relatively high level.
Claim 5
Dependent Claim
92 words
A vertical contour enhancement suppression circuit in system which performs vertical contour enhancement by subtracting a prescribed component of a video signal between horizontal scanning lines and adding a signal representing the result of subtraction to a prescribed component of the video signal, said circuit comprising: means for detecting a portion at which the level of a signal R-Y derived from said video signal is relatively high; and means for suppressing the adding processing in response to detection of the portion at which the level of the signal R-Y is relatively high.
Claim 6
Dependent Claim
92 words
A vertical contour enhancement suppression circuit in system which performs vertical contour enhancement by subtracting a prescribed component of a video signal between horizontal scanning lines and adding a signal representing the result of subtraction to a prescribed component of the video signal, said circuit comprising: means for detecting a portion at which the level of a signal R-Y derived from said video signal is relatively high; and means for suppressing the adding processing in response to detection of the portion at which the level of the signal R-Y is relatively high.
References Cited (Backward Citations)
US3919470A
Cited
US4506293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |