Bird's-eye view forming method, map display apparatus and navigation system
First Claim
1. A map display apparatus for displaying a perspective image of a map comprising:
- an image display device;
map data storage means for storing map data of such map; and
map drawing means for preparing drawing data of such map using said map data read out from said map data storage means and for displaying an image of the map on said image display device on the basis of the drawing data,wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, andsaid coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, and means for determining the projection plane on the basis of two predetermined points in the map data so that drawing positions of the two points after the perspectively projecting operation are coincident with predetermined positions.
2 Assignments
0 Petitions
Accused Products
Abstract
A map display apparatus for displaying perspective image of a map. The apparatus includes an image display device for displaying the perspective image of the map and a map data storage device for storing map data. Map drawing means is included for preparing map drawing data using the map data and for displaying a perspective image of the map on the display device on the basis of the drawing data. The map drawing means transforms coordinate data of a map into data suitable for display of the perspective image of the map. The data transformation is accomplished by perspectively projecting the coordinate data onto a predetermined projection plane with a view point at a desired position. The projection plane is determined on the basis of two predetermined points in the map data, such as the current position of a vehicle and the destination, so that drawing positions of the two points after the perspectively projecting operation are coincident with predetermined positions.
149 Citations
30 Claims
-
1. A map display apparatus for displaying a perspective image of a map comprising:
-
an image display device; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said map data read out from said map data storage means and for displaying an image of the map on said image display device on the basis of the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, and means for determining the projection plane on the basis of two predetermined points in the map data so that drawing positions of the two points after the perspectively projecting operation are coincident with predetermined positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
-
-
9. A map display apparatus for displaying a perspective image of a map comprising:
-
an image display device; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said map data read out from said may data storage means and for displaying an image of the map on said image display device on the basis of the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively protecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, the map display apparatus further comprising means for preparing drawing data of a plan view without performing the perspective projection processing, and drawing determining means for determining of the bird'"'"'s-eye view and the plan view for which the drawing data should be prepared, wherein said map drawing means further includes projection angle changing means for instructing said coordinate transforming means to prepare drawing data of at least one second bird'"'"'s-eye view to be obtained through the perspective projection using a second projection angle which is smaller than a first projection angle corresponding to the projection angle to obtain a first bird'"'"'s-eye view, and instructing said image display device to display a map image with the drawing data of the second bird'"'"'s-eye view between the first bird'"'"'s-eye view display obtained through the perspective projection using the first projection angle and the plan view display, in a case where a display target for which the drawing data are to be prepared is changed from one of the first bird'"'"'s eye view and the plan view to the other.
-
-
11. A map display apparatus for displaying a perspective image of a map comprising:
-
an image display device; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said may data read out from said map data storage means and for displaying an image of the may on said image display device on the basis of the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the may data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, the map display apparatus further comprising means for preparing drawing data of a plan view without performing the perspective projection processing, and drawing determining means for determining of the bird'"'"'s-eye view and the plan view for which the drawing data should be prepared, the apparatus further comprising an input device, and wherein said coordinate transforming means further includes drawing selection accepting means for accepting, through said input device, an instruction indicating one of the bird'"'"'s-eye view and the plan view for which the drawing data are prepared, and wherein said drawing determining means determines the drawing data to be prepared in accordance with the accepted instruction of said drawing selection accepting means, wherein said map drawing means further includes means for accepting an indication of any point contained in the map data through said input device, and wherein said drawing determining means determines the drawing data of the plan view as the drawing data to be prepared when accepting the indication of the point.
-
-
12. A map display apparatus for displaying a perspective image of a map comprising;
-
an image display device; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said map data read out from said map data storage means and for displaying an image of the map on said image display device on the basis of the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, wherein said map drawing means further includes drawing judgment means for determining whether data of at least one node contained in the drawing data should be set as one of a number of drawing targets, and eliminating said data of a node which is not set as a drawing target from the drawing targets, and wherein said map drawing means displays a map image on said image display device with the drawing data which have been processed by said drawing judgment means, wherein when the data of the node are data of a character string, the judgment of said drawing judgment means is based on a judgment as to whether the display height of the character string from the bottom side of a display frame after the perspective projection is equal to or less than a predetermined reference value on the display frame. - View Dependent Claims (13)
-
-
14. A map display apparatus for displaying a perspective image of a map comprising:
-
an image display devise; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said map data read out from said map data storage means and for displaying an image of the map on said image display device on the basis of the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, wherein said map drawing means further includes drawing judgment means for determining whether data of at least one node contained in the drawing data should be set as one of a number of drawing targets, and eliminating said data of a node which is not set as a drawing target from the drawing targets, and wherein said map drawing means displays a map image on said image display device with the drawing data which have been processed by said drawing judgment means, wherein when the data of the node are data of a character string, the judgment of said drawing judgment means is based on a judgment as to whether the distance between the visual-point position and the position at which the character string is defined in the map data is equal to or less than a predetermined reference value.
-
-
15. A map display apparatus for displaying a perspective image of a map comprising:
-
an image display device; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said man data read out from said map data storage means and for displaying an image of the map on said image display device on the basis or the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, wherein said map drawing means further includes drawing judgment means for determining whether data of at least one node contained in the drawing data should be set as one of a number of drawing targets, and eliminating said data of a node which is not set as a drawing target from the drawing targets, and wherein said map drawing means displays a map image on said image display device with the drawing data which have been processed by said drawing judgment means, wherein when the data of the nose are data of a character string, the judgment of said drawing judgment means is based on a judgment as to whether the distance between a predetermined point contained in the map and the position at which the character string is defined in the map data is equal to or less than a predetermined reference value.
-
-
16. A map display apparatus for displaying a perspective image of a map comprising;
-
an image display device; map data storage means for storing map data of such map; and map drawing means for preparing drawing data of such map using said map data read out from said map data storage means and for displaying an image of the map on said image display device on the basis of the drawing data, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, wherein said coordinate transforming means changes the projection angle in accordance with the distance between two predetermined points contained in the map data.
-
- 18. A navigation system comprising an image display device, map storing means for storing map data to display a map, map drawing means for preparing drawing data of said map by using said map data read out from said map storage means and displaying a map image on said image display device on the basis of the drawing data, and current position recognizing means for recognizing a current position, wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the map data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, and means for determining the projection plane on the basis of two predetermined points in the map data so that drawing positions of the two points after the perspectively protecting operation are coincident with predetermined positions.
-
27. A navigation system comprising an image display device, map storing means for storing map data to display a map, map drawing means for preparing drawing data of said map by using said map data read out from said man storage means and displaying a map image on said image display device on the basis of the drawing data, and current position recognizing means for recognizing a current position,
wherein said map drawing means includes coordinates transforming means for transforming coordinate data contained in the man data into data for displaying the perspective image of such map, and said coordinate transforming means includes perspective projection means for perspectively projecting the coordinate data contained in the map data onto a predetermined projection plane with a view point at a desired position to thereby prepare the drawing data of a bird'"'"'s-eye view, the navigation system further comprising an input device, wherein said coordinate transforming means changes the projection angle in accordance with the distance between the current position recognized by said current position recognizing means and a destination which is indicated through said input device.
-
28. A bird'"'"'s-eye view forming method for preparing drawing data of a map represented in a bird'"'"'s-eye view display mode with map data by perspectively projecting operation, comprising steps of:
-
perspectively projecting coordinate data contained in said map data onto a predetermined projection plane with a view point at a desired position thereby to prepare the drawing data of a bird'"'"'s-eye view; and determining said projection plane on the basis of coordinates of predetermined two points contained in said map data so that the drawing positions of the two points after the perspectively projecting operation are coincident with predetermined positions. - View Dependent Claims (29, 30)
-
Specification