US4843472A
Expired / Lapsed
US
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Processor for emphasizing edges of a video signal
Assignee: Fujifilm Corp
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Filing: 1987-12-07
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Granted: 1989-06-27
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Expires: 2007-12-07
Abstract
Abstract A processing apparatus emphasizes edges of a video signal which is applied thereto and non-linear relative to density or luminance levels adapted for the reproduction of a video signal. The processing apparatus includes a linear converter for converting the non-linear video signal into a linear video signal. The linear video signal is applied to an edge emphasizing unit to produce a linear edge-emphasized video signal. A non-linear converter is provided for applying non-linear processing to the linear edge-emphasized video signal, whereby a non-linear edge-emphasized video signal is achieved.
Inventors
- 👤 Toru Shinada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:52
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/142
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
A processing apparatus for emphasizing edges of a non-linear video signal which is supplied thereto and which is non-linear relative to density or luminance levels represented therein to produce a non-linear edge emphasized video signal, comprising: linear converting means for converting the non-linear video signal into a linear video signal; edge emphasizing means for applying edge emphasis to the linear video signal to produce a linear edge-emphasized video signal; and non-linear converting means for applying non-linear processing to the linear edge-emphasized video signal to produce the non-linear edge emphasized video signal.
Claim 2
Dependent Claim
91 words
A processing apparatus for emphasizing edges of a non-linear video signal which is supplied thereto and which is non-linear relative to density or luminance levels represented therein to produce a non-linear edge emphasized video signal, comprising: linear converting means for converting the non-linear video signal into a linear video signal; edge emphasizing means for applying edge emphasis to the linear video signal to produce a linear edge-emphasized video signal; and non-linear converting means for applying non-linear processing to the linear edge-emphasized video signal to produce the non-linear edge emphasized video signal.
Claim 3
Dependent Claim
68 words
A processing apparatus in accordance with claim 1, wherein said edge emphasizing means comprises: means for extracting edge portions of the linear video signal developed from said linear converting means and, then, emphasizing the edge portions to produce an edge-emphasized signal; and adding means for adding the linear video signal and the edge-emphasized signal to produce the linear edge-emphasized video signal for supply to said non-linear converting means.
Claim 4
Dependent Claim
99 words
A processing apparatus for emphasizing edges of a non-linear video signal which is supplied thereto and which is non-linear relative to density or luminance levels represented therein to produce a non-linear edge-compensated video signal, comprising: linear converting means for converting the non-linear video signal into a linear video signal; edge-emphasized signal producing means for producing a linear-edge-emphasized signal from the linear video signal; non-linear converting means for converting the linear edge-emphasized signal into a non-linear edge-emphasized signal; and first adding means for adding the non-linear edge-emphasized signal to the non-linear video signal to produce the non-linear edge-emphasized video signal.
Claim 5
Dependent Claim
99 words
A processing apparatus for emphasizing edges of a non-linear video signal which is supplied thereto and which is non-linear relative to density or luminance levels represented therein to produce a non-linear edge-compensated video signal, comprising: linear converting means for converting the non-linear video signal into a linear video signal; edge-emphasized signal producing means for producing a linear-edge-emphasized signal from the linear video signal; non-linear converting means for converting the linear edge-emphasized signal into a non-linear edge-emphasized signal; and first adding means for adding the non-linear edge-emphasized signal to the non-linear video signal to produce the non-linear edge-emphasized video signal.
Claim 6
Dependent Claim
102 words
A processing apparatus in accordance with claim 3, wherein said non-linear converting means comprises: first non-linear converting circuit for converting the linear edge-emphasized signal developed from said edge-emphasized signal producing means into a first non-linear video signal; second non-linear converting circuit provided with a substantially same conversion characteristic as said first non-linear converting circuit for converting the linear video signal developed from said linear converting means into a second non-linear video signal; and subtracting means for producing a difference between the first and second non-linear signals developed by said first and second non-linear converting circuits respectively to extract the non-linear edge-emphasized signal.
Claim 7
Dependent Claim
70 words
A processing apparatus in accordance with claim 4, wherein said edge-emphasized signal producing means comprises: means for extracting edge portions of the linear video signal developed from said linear converting means and, then, emphasizing the edge portions to produce an edge-emphasized signal; and second adding means for adding the linear video signal and the edge-emphasized signal to produce the linear edge-emphasized signal for supply to said first non-linear converting means.
Claim 8
Independent Claim
68 words
A method of processing a non-linear video signal which is non-linear relative to density or luminance levels represented therein to produce a non-linear edge-emphasized video signal, comprising: (a) converting the non-linear video signal into a linear video signal; (b) emphasizing edges represented within said linear video signal to produce a linear edge-emphasized video signal; and (c) converting said linear edge-emphasized video signal into a non-linear edge-emphasized video signal.
Claim 9
Independent Claim
68 words
A method of processing a non-linear video signal which is non-linear relative to density or luminance levels represented therein to produce a non-linear edge-emphasized video signal, comprising: (a) converting the non-linear video signal into a linear video signal; (b) emphasizing edges represented within said linear video signal to produce a linear edge-emphasized video signal; and (c) converting said linear edge-emphasized video signal into a non-linear edge-emphasized video signal.
Claim 10
Dependent Claim
31 words
The method of processing of claim 6 wherein said method substantially equally emphasizes the edges defining both highlights and shadows of the video image produced by said non-linear edge-emphasized video signal.
Claim 11
Dependent Claim
52 words
The method of processing of claim 6 wherein said step (b) of emphasizing comprises: (b1) extracting edge portions of the linear video signal; (b2) emphasizing the extracted edge portions to produce an edge-emphasized signal; and (b3) adding the edge-emphasized signal and the linear video signal to produce the linear edge-emphasized video signal.
Claim 12
Independent Claim
86 words
A method of processing a non-linear video signal which is non-linear relative to density or luminescence levels represented therein to produce a non-linear edge-emphasized video signal, comprising: (a) converting the non-linear video signal into a linear video signal; (b) extracting edges represented within said linear video signal; (c) developing a linear edge-emphasized signal representing those edges; (d) converting said linear edge-emphasized signal into a non-linear edge-emphasized signal; and adding the non-linear edge emphasized signal to the non-linear video signal to produce a non-linear edge-emphasized video signal.
Claim 13
Independent Claim
86 words
A method of processing a non-linear video signal which is non-linear relative to density or luminescence levels represented therein to produce a non-linear edge-emphasized video signal, comprising: (a) converting the non-linear video signal into a linear video signal; (b) extracting edges represented within said linear video signal; (c) developing a linear edge-emphasized signal representing those edges; (d) converting said linear edge-emphasized signal into a non-linear edge-emphasized signal; and adding the non-linear edge emphasized signal to the non-linear video signal to produce a non-linear edge-emphasized video signal.
Claim 14
Dependent Claim
31 words
The method of processing of claim 9 wherein said method substantially equally emphasizes the edges defining both highlights and shadows of the video image produced by said non-linear edge-emphasized video signal.
Claim 15
Dependent Claim
72 words
The method of claim 10 wherein said step (d) of convertying comprises: (d1) converting said linear edge-emphasized signal into a first non-linear video signal; (d2) converting said linear video signal developed by step a) of converting into a second non-linear video signal using substantially the same conversion characteristics as said step (d1) of converting; and (d3) taking the difference between the first and second non-linear signals to develop the non-linear edge-emphasized signal.
Claim 16
Dependent Claim
48 words
The method of processing of claim 9 wherein said step c) of developing comprises: (c1) emphasizing the edge portions extracted in said step b) of extracting to form an edge-emphasized signal; and (c2) adding the linear video signal and said edge-emphasized signal to form said linear edge-emphasized signal.
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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |