EP0141508B1
Expired / Lapsed
EP
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Video map display
Assignee: Rtsi Ltd
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Filing: 1984-09-06
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Granted: 1988-08-10
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Expires: 2004-09-06
Abstract
Abstract Map frames are stored on a video storage medium such as video disc, and a graphics generator stores overlay information such as the location of telephone lines plant. To accommodate maps of different scales covering the same area, the graphics generator applies a corresponding scaling factor to generation of the overlay image, for accurate superimposition of the map. Provision may also be made for correcting inaccuracies in the original process of recording the map frames.
Inventors
- 👤 Michael John Gray
- 👤 Ian Langdon
- 👤 Barry John Woods
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:16
CPC Classifications
G; G09; G09G; G09G5/00; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32106; H04N1/32122; H04N1/387; H04N1/3876; G09G2340/00; G09G2340/12; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3245
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
An information display apparatus comprising a storage medium having data recorded thereon representing a plurality of map frames of different scales, a first input source constituted by a video reproduction means for producing first video signals representing a selected one of the plurality of map frames, a second input source constituted by a graphic generator means for generating, from prestored overlay information in digital form, second video signals representing all or part of the overlay information, means connected to the video reproduction means and the graphic generator means for superimposing the first and second video signals, and control means connected to the graphic generator means, the control means including means for storing information representing the overlay image, characterised in that the control means is such as to select, in response to information indicative of the geographical area covered by, and the relative scale of, the selected map frame overlay image information stored by the overlay information storage means corresponding to said geographical area, and to control the graphic generator means so as to display the overlay information at the same scale as the map frame.
Claim 2
Dependent Claim
185 words
An information display apparatus comprising a storage medium having data recorded thereon representing a plurality of map frames of different scales, a first input source constituted by a video reproduction means for producing first video signals representing a selected one of the plurality of map frames, a second input source constituted by a graphic generator means for generating, from prestored overlay information in digital form, second video signals representing all or part of the overlay information, means connected to the video reproduction means and the graphic generator means for superimposing the first and second video signals, and control means connected to the graphic generator means, the control means including means for storing information representing the overlay image, characterised in that the control means is such as to select, in response to information indicative of the geographical area covered by, and the relative scale of, the selected map frame overlay image information stored by the overlay information storage means corresponding to said geographical area, and to control the graphic generator means so as to display the overlay information at the same scale as the map frame.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1, in which the video reproduction means is a videodisc player.
Claim 4
Dependent Claim
65 words
Apparatus according to claim 1 or claim 2, including further control means connected to the video reproduction means and the overlay control means, the further control means being manually operable to cause the video reproduction means to produce video signals representing a map frame geographically adjacent to the map frame previously displayed, the overlay control means being responsive thereto to select the corresponding overlay information.
Claim 5
Dependent Claim
57 words
Apparatus according to claim 3, further including a frame store and store control means, the store control means being connected to the frame store and to the video reproduction means and being operable to form in the store a frame for display, said frame comprising parts of two or more map frames stored on the storage medium.
Claim 6
Dependent Claim
86 words
Apparatus according to any one of the preceding claims, further including means, connected to the graphic generator means and adapted for operative connection to the storage medium, for storing alignment information indicating in respect of each frame, or each group of frames, recorded on the storage medium any offset between the recorded frames and a coordinate system to which the digital overlay information is referenced, the graphic generator means being responsive to said alignment information whereby the overlay information is aligned with the displayed map information.
References Cited (Backward Citations)
No citation records indexed.
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