US3746778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Limited visibility simulation for a vehicle trainer visual system
Assignee: Singer Co
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Filing: 1971-10-26
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Granted: 1973-07-17
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Expires: 1991-10-26
Abstract
Abstract Apparatus is provided to prevent the top portions of vertical objects, displayed on a scanned raster display being used to present a visual scene to an observer in a vehicle trainer and having its fast sweep in the vertical direction, from being obscured when a limited visibility function is used to modify the display in which on a line by line basis the objects are detected and the value of the visibility function held fixed until scanning of the object is completed at which time the normal function is resumed.
Inventors
- 👤 D Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:55
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/06; G09B9/063
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
In a visual display system of the scanned raster type having its fast sweep in the vertical direction wherein there is displayed to an observer a simulated real world scene as viewed from a predetermined vantage point and wherein said scene comprises a view of an essentially flat plane having vertical objects projecting from it and further including means for generating a limited visibility function to be used to obscure portions of the scene, apparatus to prevent objects in the foreground from being improperly obscured comprising; a. means to detect on a vertical line by line basis the presence of a projecting object and to provide an output indicative thereof for as long as said line is displaying said object; and b. means responsive to said output to hold the visibility function constant, at the value it had when said output first appeared, for as long as said output is present.
Claim 2
Dependent Claim
151 words
In a visual display system of the scanned raster type having its fast sweep in the vertical direction wherein there is displayed to an observer a simulated real world scene as viewed from a predetermined vantage point and wherein said scene comprises a view of an essentially flat plane having vertical objects projecting from it and further including means for generating a limited visibility function to be used to obscure portions of the scene, apparatus to prevent objects in the foreground from being improperly obscured comprising; a. means to detect on a vertical line by line basis the presence of a projecting object and to provide an output indicative thereof for as long as said line is displaying said object; and b. means responsive to said output to hold the visibility function constant, at the value it had when said output first appeared, for as long as said output is present.
Claim 3
Dependent Claim
82 words
The invention according to claim 1 wherein said responsive means comprise: a. an analog gate responsive to said detector output and having two inputs one of which is connected to the visibility function and providing an output to said display; and b. a sample and hold circuit having its sample input connected to said visibility function, its output connected to the second input of said gate and having its sampling command input being responsive to the leading edge of said detector output.
Claim 4
Dependent Claim
36 words
The invention according to claim 2 and further including: a. one shot multivibrator between said detector output and said sample command input whereby a short sampling pulse will be provided to said sample and hold circuit.
Claim 5
Dependent Claim
103 words
The invention according to claim 1 wherein said display is a color display and said display scene is generated by a scanned raster device scanning a stored representation of said scene and providing red, green and blue video signals, the flat plane areas on said stored scene being essentially black with no more than one of the three colors added with said objects in their normal color and said means to detect said object comprises means to detect a video level of a predetermined value above zero on one of the color video signals other than the one corresponding to said added color.
Claim 6
Dependent Claim
39 words
The invention according to claim 4 wherein said means to detect comprises a comparator connected to said one of the other video signals and arranged to provide an output when said video level reaches said predetermined value above zero.
Claim 7
Dependent Claim
47 words
The invention according to claim 4 wherein said stored representation is a scale model with its flat areas essentially black and containing thereon said objects in proper color and said scanned raster device to generate said scene comprises a color television camera mounted in an optical probe.
Claim 8
Dependent Claim
39 words
The invention according to claim 6 wherein said essentially black flat areas represent water and further including means associated with said display to electronically generate wave scenes on the portions of said display which would otherwise be essentially black.
References Cited (Backward Citations)
US3517122A
Cited
US3595987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |