Patent US434727A successfully refreshed from Google Patents.
Patent EP0141508A1 successfully refreshed from Google Patents.
EP0141508A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Video map display
Assignee: Rtsi Ltd
•
Filing: 1984-09-06
•
Granted: —
•
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 on 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
2026-10-25 12:18
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
132 words
An information display apparatus comprising video reproduction means for producing video signals from a storage medium representing any one of a plurality of map frames of different scales recorded on the medium, graphic generator means for generating, from overlay information in digital form, video signals representing all or part of the said overlay information, means for combining the said video signals, control means including means for storing the overlay information and arranged in operation in reponse to information indicative of the geographical area covered by, and the relative scale of, a map frame selected for display to select from the overlay storage means overlay information in respect of that 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
132 words
An information display apparatus comprising video reproduction means for producing video signals from a storage medium representing any one of a plurality of map frames of different scales recorded on the medium, graphic generator means for generating, from overlay information in digital form, video signals representing all or part of the said overlay information, means for combining the said video signals, control means including means for storing the overlay information and arranged in operation in reponse to information indicative of the geographical area covered by, and the relative scale of, a map frame selected for display to select from the overlay storage means overlay information in respect of that 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
47 words
Apparatus according to claim 1 or 2 including control means 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
39 words
Apparatus according to claim 3 including a frame store and store control means operable to form in the store a frame for display, the said frame comprising parts of two or more map frames stored on the storage medium.
Claim 6
Dependent Claim
69 words
Apparatus according to any one of the preceding claims including means storing alignment information indicating in respect of each, or each group of, frames recorded on the storage medium any offset between the recorded frames and a co-ordinate system to which the digital overlay information is referenced, the graphic generator means being responsive to the said alignment information whereby the overlay information is aligned with the displayed map information.
References Cited (Backward Citations)
FR2115150A1
Cited
US3976982A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.