JPH10267680A - Navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform guiding so that a vehicle driver can understand easily by displaying a guide road so that it is at a certain height on a road instead of a flat state on the road. SOLUTION: The display of a guide path 54 at an intersection 53 of roads 51 and 52 is improved so that a driver can easily see by adding a shade 55 and setting the guide path at a certain height. Since the guide path 54 floats from the road 52 below it, the path can be seen three-dimensionally to some extent even if the shape 55 is not provided. The guide road 54 can be seen three-dimensionally by the shade 55 and a path guide can be made further effectively when the roads 51 and 52 are being displayed three-dimensionally by the perspective diagram method. A graphic image being displayed by the display device is drawn and process on a graphic memory tentatively by a graphic controller and the image is displayed on a display device via a display controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device mounted on a vehicle such as an automobile and guiding a traveling route searched in advance by image display while detecting the current position of the vehicle.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Publication No.
BACKGROUND ART As shown in the prior art such as 01, a navigation device that performs route guidance based on road network information is used. In the route guidance by the navigation device, data such as a departure point, a destination point, and a relay point in the middle are input before the vehicle travels. Is done. When a vehicle travels on a guidance route, route guidance is performed by an enlarged display at a guidance point such as an intersection.

[0003] Fig. 8 shows a typical display screen for displaying a three-dimensional (3D) enlarged view of an intersection and displaying a guide route on a road. Road 1 visible vertically and Road 2 visible horizontally
And intersect at intersection 3. The guide route 4 displayed according to the result of the route search is displayed so as to turn right at the intersection 3 from the road 1 to the road 2.

[0004]

Since the display of the guide route 4 in the conventional navigation device as shown in FIG. 8 is performed flat on the roads 1 and 2, it is not always easy to understand. . This is because the driver of the vehicle drives the vehicle from a position at a certain height from the road surface as a viewpoint, so that when the flat guide route 4 is displayed, a sense of discomfort is generated between the driver and the viewpoint having the height. In particular, in FIG. 8, a three-dimensional display is performed on the intersection 3 by the perspective projection method, and although the intersection 3 is displayed in consideration of the viewpoint of the driver of the vehicle, the viewpoint of the guide route 4 is not considered. It has not been ignored.

An object of the present invention is to provide a navigation device capable of performing route guidance in consideration of the viewpoint of a driver of a vehicle.

[0006]

According to the present invention, a travel route between input points is searched based on road network information stored in advance, and when a vehicle travels on the searched route, In a navigation device that detects a current position of a vehicle and displays an image of a road map near the current position and displays a guide route on the road, a guide that displays the guide route so as to have a certain height on the road A navigation device including a display unit. According to the present invention, when the vehicle actually travels on the travel route searched in advance or when the vehicle travels in a pseudo manner, the guide route is displayed on the road while displaying a road map near the current position of the vehicle as an image. Since the guidance display means displays the road at a certain height, the height is adjusted to the height of the viewpoint of the driver of the vehicle, and route guidance close to reality can be performed easily.

Further, the present invention further includes a height discriminating means for discriminating, based on the road network information, whether or not the road is located at a position higher than a general road, and the guide display means includes a guide route. According to the determination result of the height determining means for the road, when the guide route is displayed on a road at a high position, the guide route is displayed so as to appear higher than when displayed on a general road. According to the present invention, the guide display means is configured such that, for a road for which route guidance is to be performed, a guide route is higher on a road at a position higher than a general road than when a guide route is displayed on a general road, according to the determination result of the height determination unit. Since the information is displayed so as to be visible, the vertical relationship in the vicinity of the guide point can be displayed in an easily understood manner.

In the present invention, the guide display means refers to the road network information, and when there is a road intersecting with the road through which the guide route passes, the guide display means according to the determination result of the height determining means for the intersecting road. When a road that intersects a road that is higher than a road that the vehicle passes, a portion that passes under the road where the guide route intersects is displayed in a state different from other portions. According to the present invention, the guide display means, for a road intersecting with the road for which guidance is to be displayed, according to the determination result of the height determination means, when the intersecting road is a road at a high position,
Since the display of the part passing under the road is performed in a state different from that of the other parts, it is possible to display at a glance that the route is passing under the elevated road.

In the present invention, the guide display means displays, on the guide route, a portion of the guide route on which the vehicle has already traveled as an indicator, refers to road network information, and intersects a road on which the guide route passes. When there is a road,
According to the determination result of the height determination means for the intersecting road, when the intersecting road is at a higher position than the road through which the guide route passes, the display of the indicator of the portion passing under the road where the guide route intersects, It is characterized in that it is performed in a state different from other parts. According to the present invention, the guidance display means not only displays a guidance route on a road in route guidance such as an intersection, but also displays, on the guidance route, a portion where the vehicle has traveled so far as an indicator. When a part passes under an elevated road, it is displayed in a different state from other parts,
It is possible to provide route guidance that makes it easy to understand that the vehicle passes under an elevated road.

The present invention further comprises a three-dimensional display means for displaying a three-dimensional image of the road map near the current position, wherein the guidance display means displays a guide route on the three-dimensionally displayed road. I do. According to the present invention, a road is displayed three-dimensionally, and a guide route is displayed with a height on the road, so that route guidance that is easy to understand with a feeling close to the state seen from the viewpoint of the driver of the vehicle is provided. Can be.

Further, in the present invention, the guide display means draws a shadow on the guide route displayed on the road and displays the guide route so that the guide route has a height. According to the present invention, a shadow is drawn on the guide route and displayed so as to have a height, so that the route guide display that is easy to understand can be performed by a simple drawing process.

[0012]

FIG. 1 shows a schematic electrical configuration of a navigation device 10 which is a basic embodiment of the present invention. In the navigation device 10, the processing unit 11 causes the guidance display unit 12 to display a road map for route guidance and the like. The road network information stored in the CD-ROM 13 expresses roads as combination data of nodes and links. The nodes indicate the coordinates of the position and the connection relationship with other nodes, and the links indicate the length and direction between the nodes. Further, for a road, information indicating the distinction between a general road, an expressway, a toll road, a motorway, and the like is stored as a link, and data indicating whether or not the road is an elevated road is also stored. Further, information on a road intersecting with the road is also stored.

The data stored in the CD-ROM 13 is electrically read by a CD-ROM driver 14. The data stored in the CD-ROM 13 is
Since information is added so that errors are easy to correct,
The data is converted into data to be processed by the processing means 11 by the CD-ROM decoder 15. The starting point, the destination point, and the
Input of a relay point or the like can be performed from the input device 16. The input device 16 is realized by a keyboard of a remote controller or the like. The detection circuit detects a power-on state. The power supply voltage is stabilized by the regulator 18 and supplied to each part of the navigation device 10. A power switch 19 is provided between a power source such as an automobile battery and the regulator 18.

In the navigation device 10, a direction sensor 21, an angle sensor 22, and a distance sensor 23 are detected via an interface 20 to detect the current position of the vehicle.
And a GPS device 24 and the like. Orientation sensor 2
1 detects the traveling direction of the vehicle as an absolute direction from, for example, an indicator. The angular velocity sensor 22 detects a change in the traveling direction of the vehicle as an angular velocity using, for example, a vibration gyro. The distance sensor 23 detects a traveling distance of the vehicle. The GPS device 24 receives radio waves from a plurality of GPS artificial satellites and detects the current position of the vehicle as absolute position coordinates. The current position of the vehicle can be detected by only a part of them. For example, the current position can be detected only by the GPS device 24. Also, a combination of the direction sensor 21 and the distance sensor 23 or the angular velocity sensor 22
And the distance sensor 23, the current position of the vehicle can be relatively detected by dead reckoning navigation.

The interface 20 is connected to the processing means 11 and the guidance display means 12 via a system bus line 25.
Connected to. CPU 26, RO
M27, RAM 28, and the like are included, and perform route search and route guidance processing according to a program stored in the ROM 27 in advance. The guidance display means 12 is provided with a display device 30 such as a liquid crystal display device or a cathode ray tube, and is controlled by a display controller 31. A graphic image displayed on the display device 30 is transmitted to a graphic controller 32.
Is once drawn on the graphic memory 33, and an image is displayed on the display device 30 via the display controller 31.

FIG. 2 shows an equivalent logical configuration when the processing means 11 of FIG. 1 operates as a route search device 40 and a route guidance device 41, which are basic functions of the navigation device 10. The route search device 40 is provided with input data such as a departure point, a destination point, or an intermediate pass point of a route to be searched from the input unit of the input device 16 of FIG. The route searching means 43 refers to the map data stored in the CD-ROM 13 on condition that the vehicle passes through each point set in the point setting means 42, determines a guidance route satisfying conditions such as the shortest distance, Search result storage means 44
To memorize. The search result stored in the search result storage means 44 is realized by the display device 30 of the guide display means 12 when the vehicle actually travels along the guide route or as a pseudo drive simulation function without actually running. Can be displayed on the output unit. When the vehicle actually runs, the direction sensor 21 and the angular velocity sensor 2
2. While detecting the current position of the vehicle with the own vehicle position search device including the distance sensor 23 or the GPS 24, the vehicle position can be displayed on the display device 30 together with a road map near the current position.

FIG. 3 shows a first embodiment of the present invention.
Guide route 54 at intersection 53 where roads 51 and 52 intersect
Is displayed in such a way that the vehicle is guided from the viewpoint of the driver of the vehicle by adding a certain height to the guide route with a shadow 55 added thereto. Shadow 55
Even without, the guide route 54 floats from the road 52 under the guide route 54, and thus appears to some extent three-dimensional. If the shadow 55 is added, a more three-dimensional effect can be seen. When the roads 51 and 52 are displayed in a three-dimensional display by the perspective projection method as shown in FIG. 3, route guidance can be performed more effectively.

FIG. 4 shows a procedure for performing the display as shown in FIG. The process starts from step a1 and proceeds to step a2
Then, “height” is added to the guide route. In step a3, it is determined whether or not the guidance route is on an elevated road. If it is determined that the vehicle is on an elevated road, "height" is further added to the guide route in step a4. When step a4 is completed, or when it is determined in step a3 that the road is not an elevated road, a guide route with a height added is displayed in step a5. In step a6, it is determined whether or not the display of the guide route has been completed. When it is determined that the process is not completed, the process returns to step a2, and when completed, the process of adding the height is completed in step a7.
The drawing of the roads 51 and 52 in FIG. 3 is performed before the addition of the height in FIG.

FIG. 5 shows a second embodiment of the present invention.
A process of adding a shadow 55 to the guide route 54 as shown in FIG. 3 and representing the height is shown. The process starts from step b1, and in step b2, it is determined whether the guide route 54 is on an elevated road. When it is judged that it is on an elevated road,
In step b3, "height" is added to the shadow of the guide route. When step b3 is completed, or when it is determined in step b2 that the guide route 54 is not on an elevated road, a shadow 55 of the guide route 54 is displayed in step b4. In step b5, it is determined whether or not the drawing for the guide route 54 has been completed. Step b if not completed
Returning to step 2, if completed, the drawing processing in step b6 ends.

FIG. 6 shows a third embodiment of the present invention.
3D shows a stereoscopic display when passing under an elevated road. FIG.
As shown in (a), a portion different from the other portions, such as hatching, is displayed on a portion where the guide route 54 on the road 51 passes below the elevated road 56. The part passing under the elevated road 56 is hatched with a pattern such as diagonal lines, or is colored lighter or darker than other parts so that it can be seen at a glance that it passes under the elevated road 56. indicate. FIG. 6B illustrates a state in which a general road 52 exists below an elevated road 56, and the guide route 58 turns left at the intersection 57 in the direction of the lower road 52. The guide route 58 of the portion below the elevated road 56 is displayed in a state different from other portions such as hatching.

FIG. 7 shows a fourth embodiment of the present invention.
A plan guidance display for enlarging and guiding around the intersection 53 is shown. In FIG. 7A, an indicator 60 indicating a portion where the vehicle has already traveled is displayed on the guide route 59. As shown in FIG. 7B, when the indicator 60 also passes under the elevated road 56, if the indicator 60 is displayed in a state different from other parts, for example, by hatching, the indicator 60 can be displayed below the elevated road. Can be easily recognized at a glance. The display of the indicator 60 can also be performed on a stereoscopic display as shown in FIG.

[0022]

As described above, according to the present invention, a guide route for displaying a previously searched route on a road is displayed so as to have a certain height from the road, so that a flat road is displayed on the road. It is possible to provide guidance that is easy for the driver of the vehicle to understand, rather than displaying the state.

Further, according to the present invention, the guide route displayed on the road is displayed so as to be higher than the general road on the elevated road, so that the vertical relationship of the road near the guide point is displayed in an easily understandable manner. Can be.

Further, according to the present invention, when the guide route passes under the elevated road, it is possible to provide a display that is easy to understand at a glance.

Further, according to the present invention, when a portion on which the vehicle has already passed on the guide route is displayed as an indicator,
The display of the portion passing under the elevated road can be easily understood.

According to the present invention, a road is displayed in three dimensions,
In addition, since the guidance display on the road is displayed so as to have a height, it is possible to effectively provide easy-to-understand route guidance from the viewpoint of the driver of the vehicle.

Further, according to the present invention, a guide route displayed on a road is drawn with a shadow so as to have a height, so that easy-to-understand guidance can be provided by simple image processing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic electrical configuration of a basic embodiment of the present invention.

FIG. 2 is a block diagram showing a logical configuration for route search and route guidance by the navigation device 10 of FIG.

FIG. 3 is a diagram showing an intersection guidance screen according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a treatment procedure according to the embodiment of FIG. 3;

FIG. 5 is a flowchart illustrating a processing procedure according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a guidance screen at an intersection according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a guidance screen at an intersection according to a fourth embodiment of the present invention.

FIG. 8 is an enlarged view of an intersection of a conventional navigation device.

[Explanation of symbols]

 Reference Signs List 10 navigation device 11 processing means 12 guidance display means 13 CD-ROM 16 input device 21 azimuth sensor 22 angular velocity sensor 23 distance sensor 24 GPS device 26 CPU 27 ROM 28 RAM 30 display device 31 display controller 32 graphic controller 33 graphic memory 40 route search Device 41 Route guidance device 42 Point setting means 43 Route search means 44 Search result storage means 51, 52 Road 53, 57 Intersection 54, 58, 59 Guide route 55 Shadow 56 Elevated road 60 Indicator

Claims (6)

[Claims] 1. A driving route between input points is searched for based on road network information stored in advance.
When the vehicle travels on the searched route, the navigation device detects the current position of the vehicle and displays an image of a road map near the current position while displaying a guide route on the road. A navigation device comprising a guide display means for displaying a certain height on the display. 2. The vehicle according to claim 1, further comprising a height determination unit configured to determine whether the road is located at a position higher than a general road based on the road network information. 2. The navigation device according to claim 1, wherein when the guide route is displayed on a road at a high position, the guide route is displayed to be higher than when the guide route is displayed on a general road, according to the determination result of the height determining means. . 3. The guide display means refers to road network information and, when there is a road intersecting with the road through which the guide route passes, the guide route passes according to the determination result of the height determination means for the intersecting road. 3. The navigation device according to claim 2, wherein when a road that intersects the road is at a higher position, a portion passing below the road where the guide route intersects is displayed in a state different from other portions. . 4. The guide display means displays a portion of the guide route on which the vehicle has already traveled as an indicator on the guide route, refers to road network information, and determines whether a road that intersects a road through which the guide route passes. At one time, according to the determination result of the height determining means for the intersecting road, when the intersecting road is higher than the road through which the guide route passes, the indicator of the portion passing under the road where the guide route intersects is displayed. 3. The navigation device according to claim 2, wherein the display is performed in a state different from other parts. 5. A three-dimensional display means for displaying a road map near the current position in a three-dimensional image, wherein the guidance display means displays a guidance route on a three-dimensionally displayed road. The navigation device according to any one of claims 1 to 4. 6. The navigation device according to claim 1, wherein the guidance display means draws a shadow on the guidance route displayed on the road and displays the guidance route so as to have a height. .