JP3229832B2 - Navigation device - Google Patents

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 providing route guidance based on road network information.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. 7-198401 discloses a prior art of a navigation device which performs route guidance based on map network information. In this prior art, an operation mode in which the vehicle travels virtually along a guide route is provided.

In a recent navigation device, guidance such as an intersection is provided by an enlarged display during virtual traveling or actual traveling.

FIG. 8 shows an enlarged display of a conventional general intersection. Even at the intersection 3 where the general road 1 intersects with the elevated road 2 such as an expressway, the height information is not displayed on the elevated road 2, so that both the ordinary road 1 and the elevated road 2 appear to be planar. The eyes of the driver of the vehicle do not match the image of the elevated road 2 at the intersection where the vehicle actually passes, and it is difficult to recognize the guidance route even if the route guidance display 5 is displayed.

[0005]

In an enlarged display of an intersection or the like in a conventional navigation device, a road or surrounding landmarks are displayed in an enlarged manner, but the road itself does not include height information and is flat. It is. For this reason, it is difficult for the driver of the vehicle to distinguish between a case where a highway or the like is passing through an enlarged display such as an intersection and a case where only a normal road is used. turn into. Also, when it is necessary to enter a highway or the like, or when it is necessary to enter a general road from an expressway or the like, the guide route is difficult to understand with a mere enlarged display.

An object of the present invention is to provide a display having a height on roads having different road attributes from other general roads such as an expressway, and to provide route guidance that is easy for a driver passing through an intersection or the like to understand. A navigation device is provided.

[0007]

According to the present invention, a route between input points is searched based on road network information stored in advance, guidance is provided along the searched route, and an intersection or the like exists. At a point, a navigation device that provides guidance using an enlarged display image compares a plurality of road attributes intersecting at an intersection based on the road network information, and assigns a road attribute indicating a highway or a toll road to the road network information. A road that is given a road attribute indicating the expressway or the toll road, and has a height in the display according to a selection unit that selects the road that is being selected and a selection result of the selection unit. And a display unit for performing a three-dimensional display by performing a drawing process as described above. According to the present invention, road attributes of a plurality of roads intersecting at an intersection are compared, and a road having a road attribute indicating a highway or a toll road in the road network information is selected by a selection unit. The display means performs a three-dimensional display by adding a shadow to the road selected by the selection means and performing drawing processing so as to have a height in the display for enlarged route guidance. Depending on the height, roads with highway or toll road attributes are displayed so that they can be easily distinguished from other roads, so that differences in road attributes can be easily recognized and appropriate. Route guidance can be provided.

[0008]

[0009]

[0010]

Further, in the present invention, the display means adds the shadow to a side surface of the road. According to the present invention, since the three-dimensional display is performed by adding a shadow to the side of the road, the height of the road can be easily expressed by the height of the side.

In the present invention, the display means adds the shadow to a lower part of the road. According to the present invention, since a three-dimensional display is performed by adding a shadow to the lower part of the road, the height can be displayed by the distance between the road and the shadow, and an easy-to-understand intersection can be displayed.

Further, in the present invention, the display means is characterized in that the shadow is added by a painting process using a predetermined pattern with a predetermined color. According to the invention, the shadow is a predetermined color, for example black or gray,
A predetermined pattern, for example, by completely filling one color or by hatching or the like, a display in which a predetermined color is partially added in accordance with a predetermined pattern and a display that is the same as the original display are mixed, and the shadow is easily recognized. Can be displayed.

Further, in the present invention, the display means may include a point at which the guide route enters a road having a road attribute indicating the expressway or toll road from a road having no road attribute indicating the expressway or toll road. Is displayed in such a manner that there is no height at the entry point and the height increases as the vehicle approaches. According to the present invention, when entering a road having a road attribute indicating a highway or a toll road from, for example, a general road having no road attribute indicating a highway or a toll road,
Since there is no height at the entrance point, and the display is made three-dimensionally by inclining so that the height increases as the vehicle enters, an entrance ramp from a general road to an expressway or a toll road can be displayed in an easily recognizable manner.

[0015] In the present invention, the display means may provide guidance for a point of entry from a road having a road attribute indicating the expressway or toll road to a road having no road attribute indicating the expressway or toll road. It is characterized in that the display is tilted so that the height is reduced by the approach point and the height is eliminated at the approach point. According to the present invention, when approaching from a road having a road attribute indicating a highway or a toll road to a general road not having a road attribute indicating a highway or a toll road, the height is reduced to an entry point. Since the display is performed at an angle where the height is lost, the change in the road attribute can be displayed in an easily understandable manner.

Further, in the present invention, the display means may be arranged such that when a road attribute indicating the expressway or toll road does not change when passing through an intersection, the three-dimensional display of the road having the road attribute does not change as it is. Features. According to the present invention, for an intersection where a road attribute indicating a highway or a toll road does not change along the route being guided,
Since the height of the three-dimensional display is not changed, it is possible to display to the driver of the vehicle that the driver of the vehicle can easily understand that the vehicle does not enter the road whose road attribute changes.

[0017]

FIG. 1 shows a schematic electrical configuration of a navigation device 10 which is a basic embodiment of the present invention. In this embodiment, the sorting means 11 displays the display means 12 with C
An image of route guidance is displayed based on the road network information recorded in the D-R0M13, and roads that are three-dimensionally displayed in an enlarged display such as an intersection are selected. CD-R0M13 which is a recording medium for road network information
The storage contents are electrically read by the CD-R0M driver 14, and the storage contents read by the CD-R0M decoder 15 are converted into data. A target point or the like when the navigation device 10 performs a route search is input from an input device 16 such as a remote controller and a keyboard. The power-on state is detected by the detection circuit 17. 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 the battery power source of the vehicle and the regulator 18, and when the power switch 19 is closed, power is supplied to the navigation device 10.

The navigation device 10 is connected via an interface 20 to an azimuth sensor 21, an angular velocity sensor 22, a distance sensor 23, a GPS device 24, etc., for detecting the current position of the vehicle. Direction sensor 21
Detects the traveling direction of the vehicle as an absolute direction from, for example, geomagnetism. The angular velocity sensor 22 detects a change in the traveling direction of the vehicle as an angular velocity using, for example, a vibrating gyroscope. The distance sensor 23 detects the traveling distance of the vehicle. The GPS device 24 receives radio waves from a plurality of GPS artificial satellites and calculates the current position of the vehicle as absolute coordinates. The azimuth sensor 21 or the angular velocity sensor 22 and the distance sensor 23 are combined and used to relatively calculate the current position of the vehicle based on dead reckoning navigation. The current position of the vehicle calculated by dead reckoning or the current position of the vehicle calculated by the GPS device 24 is CD-R0.
Accuracy can also be improved by map matching referring to the road network information of M13. Dead-reckoning can be implemented by using either the direction sensor 21 or the angular velocity sensor 22. The calculation of the current position by dead reckoning navigation and the calculation of the current position by the GPS device 24 do not necessarily need to be performed, and only one may be performed.

The interface 20 is connected to a sorting means 11, a display means 12, a CD-
It is connected to the R0M decoder 15 and the input device 16.
The selecting means 11 includes a CPU 26, a ROM 27, and a RAM.
28. The CPU 26 detects the detection circuit 17
Detects that the power supply voltage rises when the power switch 19 is turned on, according to a preset program,
After performing the initialization operation, the control operation as the navigation device 10 is performed, and as a part thereof, the sorting according to the attribute of the road is performed. An operation program for the CPU 26 is set and stored in the ROM 27 in advance. RAM 28 is a CP
Various data are temporarily stored by the operation of U26.

The display means 12 includes a liquid crystal display (LC)
D) and a display device 30 realized by a cathode ray tube (CRT) or the like. The display device 30 is controlled by a display controller 31. The display controller 31 is provided with graphic display data stored in the graphic memory 33 from the graphic controller 32. The graphic controller 32 performs a drawing process for a road or the like.

FIG. 2 shows an equivalent logical configuration when the CPU 26, the ROM 27, and the RAM 28 of FIG. 1 operate as a route search device 40 and a route guidance device 41, which are basic functions of the navigation device 10. . In the route search device 40, an input such as a departure point, a destination point, or a passing point on the way to be searched from the input unit of the input device 16 of FIG. The route search means 43 is provided on the condition that the vehicle passes through each point set in the point setting means 42.
With reference to the map data stored in 3, a route serving as a guidance route is searched for according to a search method such as the Dijkstra method, and the search result storage means 44 stores the search result. The stored search result can be displayed as a simulation on the display unit 12. When the vehicle travels along the guidance route, the direction sensor 21, the angular velocity sensor 22, the distance sensor 23, and the GP
The vehicle position determined by the vehicle position detection device constituted by the S device 24 is subjected to map matching, and the display means 12 displays a map near the road on which the vehicle is located, while the route guidance device 41 follows the guidance route. Can be displayed.

FIG. 3 shows a first embodiment of the present invention.
A road having an attribute different from that of the general road 51 is an elevated road 5
Reference numeral 2 denotes a screen of the display unit 12 for displaying a stereoscopic image. The elevated road 52 is, for example, an expressway or a toll road, and has different attributes from the general road 51 in the road network information stored in the CD-ROM 13. The three-dimensional display for distinguishing the elevated road 52 from the general road 51 at the intersection 53 is performed by drawing a shadow 54 on the side surface of the elevated road 52. The height is added to the elevated road 52 by drawing the shadow 54 on the side surface. The shadow 54 performs, for example, a process of filling with black or gray or drawing a pattern such as hatching or plaid with black or gray lines. The guidance route is performed by a route guidance display 55 indicated by an arrow.

FIG. 4 shows a second embodiment of the present invention.
An intersection 53 that enters an elevated road 52 from a general road 51
5 shows a state in which the height of the entrance portion of the elevated road 52 is eliminated, and a three-dimensional display is performed by the shadow 54 so as to have an inclination whose height increases as the vehicle enters the elevated road 52. Route guidance display 5
5 can enter the elevated road 52 along the slope from a low state on the general road 51, and can guide the entry state of the entrance ramp such as a highway in an easy-to-understand manner.

FIG. 5 shows a third embodiment of the present invention.
A three-dimensional guidance display by a shadow at an intersection 53 that escapes from an elevated road 52 to a general road 51 is shown. The shadow 54 is drawn so as to be inclined so that the height disappears at the entry point from the elevated road 52 to the general road 51. If the route guidance display 55 from such a slope to the general road 51 is displayed, the route guidance to the exit ramp that escapes from the elevated road 52 to the general road 51 can be easily understood.

FIG. 6 shows a fourth embodiment of the present invention.
A shadow 56 for stereoscopically displaying the elevated road 52 is displayed on the elevated road 5.
2 shows a state in which a three-dimensional display is performed by drawing at the lower part of 2 and by the height from the shadow 56. The shadow 56 drawn on the lower part of the elevated road 52 can also perform three-dimensional display of an inclined portion as shown in FIGS. In addition, as shown in FIGS. 3 and 6, when the entry from the general road 51 to the elevated road 52 and the escape from the elevated road 52 to the general road 51 are not performed, the height of the shadows 54 and 56 with respect to the elevated road 52 is reduced. The stereoscopic display is performed as it is without changing. The shadow 56 to be added to the lower part of the road is also the shadow 5 to be added to the side surface.
4 can be drawn.

FIG. 7 shows a processing procedure when the stereoscopic display as shown in FIGS. 3 to 6 is performed on a highway. The process starts from step a1, and in step a2, it is determined whether or not the road attribute is “high speed”. When it is determined that the road attribute is high speed, the height is added to the start point and the end point of the road to be displayed. Next, in step a4, it is determined whether or not the start point or the end point is connected to a road whose road attribute is "general". When it is determined that the vehicle is connected, the height of the vehicle connected to the general road is lowered. When step a5 is completed or when step a4
When it is determined in step a2 that the road is not connected to a general road, or when it is determined in step a2 that the road attribute is not high-speed, in step a6, the road data is converted into a perspective view in 3D for three-dimensional display. Next, in step a7, a drawing process is performed based on the 3D road data. The shadow of each embodiment is
It is added during the drawing process. Next, in step a8, it is determined whether or not the data of the road to be drawn has been completed.
If there is any remaining data, the process returns to step a2 to continue drawing. If it is determined in step a8 that the data has been completed, the process is terminated in step a9.

[0027]

As described above, according to the present invention, a road having a road attribute indicating a highway or a toll road is three-dimensionally displayed and a drawing process is performed so as to have a height. Thus, it is possible to provide a display that is close to the state of the road actually seen by the driver of the vehicle, and to provide easy-to-understand intersection guidance.

[0028]

[0029]

[0030]

Further, according to the present invention, since the shadow of the road is added to the side, the height of the road can be easily displayed by the height of the side.

Further, according to the present invention, since the shadow of the road is added to the lower part of the road, the height of the road can be easily three-dimensionally displayed according to the distance from the shadow.

Further, according to the present invention, the shadow to be added to the road is filled by a predetermined pattern with a predetermined color, so that a difference in height can be easily displayed by a difference in color or pattern.

Further, according to the present invention, when entering a road having no road attribute indicating a highway or a toll road, there is no height at the entry point, and the height increases as the vehicle approaches. Is displayed in such a manner as to increase the number of incidents, so that the approach route can be displayed in an easily recognizable manner.

Further, according to the present invention, when entering from a road having a road attribute indicating a highway or a toll road to a road not having the road attribute, a three-dimensional structure having a slope such that the height is reduced and disappears. Since the display is performed, it is possible to easily guide the danger of approaching a road having different road attributes.

Further, according to the present invention, when a road attribute indicating a highway or a toll road does not change when passing through an intersection, the three-dimensional display is not changed and the height is not changed. Guidance for traveling on a road can be provided in an easily understandable manner.

[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 diagram showing a guidance screen at an intersection according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a guidance screen at an intersection according to a third embodiment of the present invention.

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

FIG. 7 is a flowchart showing a processing procedure according to the first to fourth embodiments of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Navigation apparatus 11 Sorting means 12 Display means 13 CD-ROM 16 Input device 21 Orientation 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 General road 52 Elevated road 53 Intersection 54, 56 Shadow 55 Route guidance display

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-332994 (JP, A) JP-A-8-1224096 (JP, A) JP-A-9-304106 (JP, A) JP-A 9-304 222851 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01C 21/00 G08G 1/0969 G09B 29/10

Claims (7)

(57) [Claims] 1. A route between input points is searched based on road network information stored in advance, guidance is provided along the searched route, and an enlarged display image is used at a point where an intersection or the like exists. In a navigation device for performing guidance, a plurality of road attributes intersecting at an intersection are compared based on the road network information, and a selection unit that selects a road to which a road attribute indicating a highway or a toll road is given in the road network information. According to the selection result of the selection means, a shadow is added to a road to which the road attribute indicating the highway or the toll road is given, and a drawing process is performed so that the road has a height during display. A navigation device comprising: display means for performing display. 2. The navigation device according to claim 1, wherein the display unit adds the shadow to a side surface of the road. 3. The navigation device according to claim 1, wherein the display unit adds the shadow to a lower part of the road. 4. The navigation device according to claim 1, wherein the display unit adds the shadow by a painting process using a predetermined pattern with a predetermined color. 5. The guide means for guiding a point at which the guide route enters a road having a road attribute indicating a highway or a toll road from a road having no road attribute indicating the highway or a toll road. The navigation device according to any one of claims 1 to 4, wherein there is no height at the entry point, and the display is tilted so that the height increases as the vehicle approaches. 6. The display means provides guidance for a point of entry from a road having a road attribute indicating the expressway or toll road to a road not having a road attribute indicating the expressway or toll road. The navigation device according to any one of claims 1 to 5, wherein the display is tilted and displayed so that the height is reduced by the time and the height is eliminated at the entry point. 7. The three-dimensional display of a road having the road attribute does not change when the road attribute indicating the expressway or the toll road does not change when passing through an intersection. The navigation device according to claim 1.