JPH09212083A - Method and apparatus for plotting electronic map as well as on-vehicle navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To present adequate information easily visible for a user at the time of three-dimensionally displaying the facilities on a map. SOLUTION: Only the facilities near guide points in the facility information are selected by a display object selecting means 13. The facilities existing just before the guide point are decided as non-preferential display objects by an image attribute forming means 18 and are plotted by a three-dimensional image plotting means 16, by which only the necessary facilities are displayed. The important information, such as roads and traveling routes near the crossing points, is displayed so as not to be concealed by the facility information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic map drawing method and apparatus for displaying electronic map information, and an on-vehicle navigation device for displaying a map near the current position of a vehicle and a driving route.

[0002]

2. Description of the Related Art Conventionally, there is an on-vehicle navigation device as a device for guiding an occupant to a predetermined destination. this is,
Using the current position information of the vehicle obtained by the current position detection means such as a GPS receiver, the map information stored in the map information storage means such as a CD-ROM is read and a map near the current position is displayed on a liquid crystal monitor or the like. The route search means calculates the travel route from the predetermined departure place to the predetermined destination, and the direction in which the driver should travel is indicated at the intersection or branch point based on the vehicle position information and the travel route. When a call is made, it is a device that provides guidance by means of voice or screen display.

As a map display near the current position, not only the map information is displayed two-dimensionally on the screen, but also the landscape viewed from the driver is displayed three-dimensionally, and the displayed map and running A device devised so that it can easily correspond to an actual road has also been proposed. Such an on-vehicle navigation device is described in, for example, Japanese Patent Application Laid-Open No. 5-203457.

FIG. 14 shows the configuration of a conventional example of an electronic map drawing device in a vehicle-mounted navigation device for three-dimensionally displaying a landscape viewed from the driver. In FIG. 14, 1
Is a current position detection means, 2 is a viewpoint calculation means, 3 is a signal processing means, 4 is map information storage means, 5 is a three-dimensional image drawing means, and 6 is a display means.

Next, the operation of the above conventional example will be described.
In FIG. 14, the signal processing means 3 is composed of a microcomputer and requests the map information storing means 4 for map information near the current position based on the current position information calculated by the current position detecting means 1. The viewpoint calculation means 2 receives the current position information from the signal processing means 3 and calculates the viewpoint information necessary for three-dimensional image drawing. Furthermore, the signal processing means 3 is
The map information sent from the map information storage means 4 and the viewpoint information sent from the viewpoint calculation means 2 are sent to the three-dimensional image drawing means 10 and the image drawn by the three-dimensional image drawing means 6 is displayed together with the current position information. It is displayed on the means 6.

In the above conventional example, the map near the current position displayed on the display means 6 is displayed three-dimensionally as shown in FIG. This is because the map data stored in the map information storage means 4 includes three-dimensional shape data such as buildings and mountains existing on the map in addition to road information. This is because the three-dimensional image drawing means 5 generates an image of the landscape viewed from the viewpoint instructed by the viewpoint calculating means 2. In such a three-dimensional display,
Correspondence between the current position on the road map displayed on the screen and the actual position on the actual road for the user boarding the moving body, depending on whether the display state of the screen is similar to the actual road traveling situation of the moving body. There is an advantage that it is easy to take.

[0007]

However, in the above conventional electronic map drawing apparatus, the map information storage means 4 is used.
Since the image of the landscape seen from the viewpoint is generated based on the 3D shape data stored in, it is necessary to present more information than necessary to the users on the moving body. However, there is a problem that road information that is important to the user may be hidden in information such as facilities displayed in a three-dimensional shape, resulting in a map display that is difficult to see.

The present invention solves the above-mentioned conventional problems, and an excellent electronic map drawing method that allows the user to easily display the necessary guidance target without presenting more information than necessary and its method. An object of the present invention is to provide a device and a vehicle-mounted navigation device.

[0009]

In order to achieve the above object, according to the present invention, the display object selection means selects the data to be displayed from the three-dimensional shape data according to the viewpoint information, and only the selected information is displayed. Is displayed. As a result, an excellent electronic map drawing method, its device, and an in-vehicle navigation device can be obtained which allow the user to easily display the necessary guidance target without presenting more information than necessary.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is an electronic map drawing method of an in-vehicle navigation device for three-dimensionally displaying facilities on a map, and the facilities near the guide map point in the facility information. It is characterized in that only the selected information is displayed, and by displaying only the appropriate information according to the viewpoint, there is an effect that a more understandable display is possible.

The invention according to claim 2 of the present invention is necessary for the current position detecting means for detecting the current position information of the vehicle and the coordinate calculation for performing the map drawing from the current position information of the vehicle by the three-dimensional image processing. A viewpoint calculating means for calculating a different viewpoint position and a line-of-sight direction, map information is read from the map information storing means based on the current position information of the vehicle, and signal processing means for controlling each means, and the read map information are used. An electronic map drawing device provided with a display target selection means for selecting information to be displayed based on viewpoint information and a three-dimensional image drawing means for performing three-dimensional drawing processing of the selected information and displaying it on the display means. Therefore, by displaying only the appropriate information according to the viewpoint, the display can be more easily understood.

The invention according to claim 3 of the present invention is characterized in that the display object selection means selects facility information adjacent to an intersection located in the line-of-sight direction based on road information and viewpoint information. By not displaying the three-dimensional shape other than the facility information adjacent to the intersection in the line-of-sight direction, the display can be more easily understood.

The invention according to claim 4 of the present invention is characterized in that the display target selection means selects facility information adjacent to an intersection closest to the viewpoint located in the line-of-sight direction based on the road information and the viewpoint information. Therefore, by not displaying the three-dimensional shape other than the facility information adjacent to the closest intersection in the line-of-sight direction, the display can be more easily understood.

The invention according to claim 5 of the present invention comprises image attribute generating means for classifying the information sorted by the display target sorting means into display priority information and display non-priority information, It is characterized in that different drawing processing is performed by the three-dimensional image drawing means based on this, and a drawing method that makes insignificant facilities or facilities that hide important information out of the three-dimensional shapes to be displayed inconspicuous. Drawing has the effect of enabling a more understandable display.

In the invention according to claim 6 of the present invention, the image attribute generation means classifies road information and facility information located far from the viewpoint as display priority information, and displays facility information located near the viewpoint. The feature is that the information is classified as non-priority information, and by not drawing the information of the facility away from the viewpoint, there is an effect that a more understandable display is possible.

In the invention according to claim 7 of the present invention, the image attribute generating means classifies the facility information adjacent to the intersection located in the line-of-sight direction by the road information and the viewpoint information as the display priority information, and the other facility information. Is classified as display non-priority information, and by displaying in a three-dimensional shape so that only facility information that serves as a mark of intersections in the direction of the line of sight is conspicuous, it is possible to make the display easier to understand. Have an effect.

According to the eighth aspect of the present invention, the image attribute generating means classifies the facility information adjacent to the intersection closest to the viewpoint located in the line-of-sight direction based on the road information and the viewpoint information as the display priority information. , Other facility information is classified as display non-priority information, and it is more understandable by displaying only the facility information that is a mark of the closest intersection in the line-of-sight direction in a three-dimensional shape so that it stands out. This has the effect that easy display is possible.

According to a ninth aspect of the present invention, the image attribute generating means classifies the road information and the facility information located in the far direction of the viewpoint from the intersection as display priority information, and locates from the intersection in the viewpoint direction. It is characterized by classifying facility information as display non-priority information, and has the effect of making it easier to understand by preventing roads intersecting at intersections from being hidden by facility information. .

According to a tenth aspect of the present invention, the three-dimensional image drawing means draws only the contour line of the facility classified as the display non-priority information by the image attribute generating means. The feature is that the facility information can be displayed without hiding the information on the back side of the facility with a small amount of calculation, and thus an easier-to-understand display is possible.

The invention according to claim 11 of the present invention is characterized in that the three-dimensional image drawing means draws semi-transparently the facilities classified as the display non-priority information by the image attribute generating means. Therefore, by displaying the facility information without damaging the three-dimensional shape information of the facility and hiding the information on the back side of the facility, it is possible to perform a more easy-to-understand display.

A twelfth aspect of the present invention is a vehicle-mounted navigation device equipped with the electronic map drawing device according to any one of the second to eleventh aspects, and is used for a facility in a direction other than a traveling direction of a vehicle. By not displaying the dimensional shape,
This has the effect that a more easily understandable display is possible.

According to a thirteenth aspect of the present invention, in the vehicle-mounted navigation device according to the twelfth aspect, the road information and the facility information adjacent to the intersection on the traveling road of the vehicle calculated by the current position detecting means are displayed. It is characterized in that the selection is made by the display object selection means, and it is possible to make the display easier to understand by not displaying the three-dimensional shape of the facility near the road other than the road on which the vehicle travels. Have an effect.

According to a fourteenth aspect of the present invention, in the vehicle-mounted navigation device according to the twelfth aspect, operation means for setting destination information based on a user's request,
It is characterized in that it comprises a route search means for calculating the traveling route of the vehicle from the set destination information, and the road information and the facility information adjacent to the intersection on the traveling route are sorted by the display target sorting means. By not displaying the three-dimensional shape of the facility near the road other than the travel route on which the vehicle is going to travel, it is possible to make the display easier to understand.

According to a fifteenth aspect of the present invention, in the vehicle-mounted navigation device according to any of the twelfth to fourteenth aspects, there is provided guide means for performing guidance guidance at a specific intersection on a travel route, and road information is provided. And facility information adjacent to the intersection next to which guidance is provided by the guide means, are selected by the display target selection means, and facilities other than the facility adjacent to the intersection to be next route guidance are provided. Since the three-dimensional shape is not displayed, the display can be more easily understood.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 shows a configuration of an electronic map drawing apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a flow chart of an electronic map drawing method according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 11 denotes a current position detecting means for detecting current position information such as current position coordinates of a vehicle, a traveling direction, a traveling speed, and the like.
It consists of a receiver. 12 is a viewpoint calculation means,
The viewpoint position and the line-of-sight direction necessary for coordinate calculation for performing map drawing by three-dimensional image processing are calculated from the current position information, and in the present embodiment, it is composed of a microcomputer. Reference numeral 13 denotes a display target selection means, which selects only the graphic information to be displayed based on its position information and viewpoint information, and is configured by a microcomputer in the present embodiment. Reference numeral 14 denotes a signal processing means, which controls the entire apparatus, acquires current position information and map information, and displays a map, and is composed of a microcomputer in the present embodiment. Reference numeral 15 is a map information storage means for storing road information and three-dimensional shape information of the facility. In the present embodiment, the CD-R is used.
It is composed of an OM and a CD-ROM reproducing device. 1
Reference numeral 6 denotes a three-dimensional image drawing means, which performs coordinate conversion of the three-dimensional shape information from the viewpoint information and performs drawing processing so that the display means 17 can display the information, and is composed of a microcomputer in the present embodiment. Reference numeral 17 is a display means for displaying map information which has been subjected to drawing processing, and is composed of a liquid crystal display.

The operation of the electronic map drawing apparatus configured as described above will be described below with reference to the flow chart of FIG. First, the current position information is detected by the current position detecting means 11 (step 21). Then, based on the detection results,
The viewpoint calculating means 12 calculates a viewpoint position and a line-of-sight direction necessary for coordinate calculation for performing map drawing by three-dimensional image processing (step 22). Next, the signal processing unit 14 reads the map information near the current position to be drawn from the map information storage unit 15 (step 23), and the road information of the read map information is drawn on the display unit 17. At the same time (step 24), facility information having three-dimensional shape information is read from the map information storage means 15 one by one (step 25). From the coordinates of the read facility information, the display target selection unit 13 determines whether or not the facility is adjacent to an intersection existing in the line-of-sight direction (step 26). Then, only the facilities adjacent to the intersection existing in the line-of-sight direction are drawn on the display means 17 by the three-dimensional image drawing means 16 (step 27). Then, the drawing determination and the drawing process are completed for all the facilities belonging to the map display range (step 28), and the map drawing process is completed.

FIG. 3 shows an example of the result of drawing a map near the current position according to the first embodiment of the present invention. As is clear from the comparison of the drawing result of FIG. 3 with the drawing result of the conventional example shown in FIG. 15, the electronic map drawing device according to the present embodiment has an excellent effect in displaying only the appropriate information according to the viewpoint. Is obtained.

As described above, according to the first embodiment of the present invention, the display target selection means 13 selects only the facility adjacent to the intersection existing in the line-of-sight direction from the facility information and performs the drawing process. Therefore, unnecessary facility information other than the line-of-sight direction and other than the vicinity of the intersection are deleted from the display, and the information given to the user is optimized, so that an easy-to-see map display can be realized.

(Second Embodiment) FIG. 4 is a flow chart of an electronic map drawing method according to the second embodiment of the present invention. The configuration of the electronic map drawing device according to the second embodiment of the present invention is as follows.
Since it is the same as the first embodiment shown in FIG. 1, redundant description will be omitted, and only the operation will be described here with reference to the flow chart of FIG.

First, the present position information is obtained from the present position detecting means 1.
1 (step 41), the viewpoint calculation means 12 calculates the viewpoint position and the line-of-sight direction (step 42), and the map information is read from the map information storage means 15 (step 43).
The process until the road information is drawn (step 44) is the same as that of the first embodiment of the present invention. Next, the signal processing means 14
While searching for the intersection closest to the current position in the traveling direction from the current position information and the line-of-sight direction (step 4
5) Of the map information, facility information having three-dimensional shape information is read from the map information storage means 15 one by one (step 46). From the coordinates of the read facility information, the display target selection unit 13 determines whether or not the facility is adjacent to the intersection closest to the current position in the traveling direction (step 47). Next, only the facility adjacent to the intersection closest to the current position in the traveling direction is drawn on the display means 17 by the three-dimensional image drawing means 16 (step 48). Then, the drawing determination and the drawing process are completed for all the facilities belonging to the map display range (step 49), and the map drawing process is completed.

FIG. 5 shows an example of the result of drawing the map near the current position according to the second embodiment of the present invention. As is clear from the comparison of the drawing result of FIG. 5 with the drawing result of the conventional example shown in FIG. 15, the electronic map drawing device according to the present embodiment first provides information on the vicinity of the intersection closest to the target current position during traveling. An excellent effect is obtained in that only the display is shown.

As described above, according to the second embodiment of the present invention, the display target selection means 13 selects only the facility adjacent to the intersection closest to the current position in the traveling direction in the facility information and performs the drawing process. By doing so, unnecessary facility information that is unlikely to be the other target is deleted from the display, and the information given to the user is optimized, so that an easy-to-see map display can be realized.

(Third Embodiment) FIG. 6 shows a configuration of an electronic map drawing apparatus according to a third embodiment of the present invention, and FIG. 7 is a flow chart of an electronic map drawing method according to the third embodiment of the present invention. In FIG. 6, reference numeral 18 denotes an image attribute generating means, which determines an attribute when drawing the three-dimensional shape information for drawing, and is composed of a microcomputer in the present embodiment. Other parts are the same as the configuration of the electronic map drawing device according to the first embodiment of the present invention shown in FIG. 1, and therefore redundant description will be omitted.

The operation of the electronic map drawing method configured as described above will be described below with reference to the flowchart of FIG.

First, the current position information is detected by the current position detecting means 1
1 (step 71), the viewpoint calculation means 12 calculates the viewpoint position and the line-of-sight direction (step 72), and the map information is read from the map information storage means 15 (step 73).
Road information is drawn (step 74), neighborhood intersections are searched (step 75), and facility information is read (step 7).
Up to 6), it is the same as the second embodiment of the present invention.

Next, from the coordinates of the read facility information, the display target selection means 13 determines whether or not the facility is adjacent to an intersection existing in the line-of-sight direction (step 77). If the facility is not adjacent to the intersection existing in the line-of-sight direction, the facility is not drawn. If the facility is adjacent to the intersection existing in the line-of-sight direction, it is further determined whether the facility is adjacent to the intersection closest to the current position in the traveling direction (step 78). Then, for the facility adjacent to the intersection closest to the current position in the traveling direction, the image attribute generation unit 18 sets the display attribute to the image attribute of the facility (step 79),
Other facilities set the image attribute to non-priority (step 80). Next, these facilities are drawn on the display means 17 by the three-dimensional image drawing means 16 (step 81). At this time, when the image attribute is display priority, the facility is drawn by a normal display method and display color. On the other hand, when the image attribute is not prioritized, the facility is drawn by drawing only its outline or by making the display color semi-transparent so that the facility is less noticeable than the facility with the drawing priority. Then, the drawing determination and the drawing process are completed for all the facilities belonging to the map display range (step 82), and the map drawing process is completed.

FIG. 8 shows an example of the result of drawing a map near the current position according to the third embodiment of the present invention. As is clear from a comparison of the drawing result of FIG. 8 with the drawing result of the conventional example shown in FIG. 15, the electronic map drawing device according to the present embodiment first provides information on the vicinity of the intersection closest to the target current position during traveling. Is drawn as usual, and an excellent effect can be obtained in that information near a distant intersection having a low priority as a target is displayed inconspicuously.

As described above, according to the third embodiment of the present invention, the display target selection means 13 and the image attribute generation means 18 enable the display target facilities to obtain information on neighborhoods having high priority as targets. Since the information is displayed conspicuously and distant information having a low priority as a target is conspicuously displayed, the information given to the user is optimized and an easy-to-see map display can be realized.

(Embodiment 4) FIG. 9 is a flow chart of an electronic map drawing method in Embodiment 4 of the present invention. The configuration of the electronic map drawing device according to the fourth embodiment of the present invention is as follows.
Since it is the same as the third embodiment of the present invention shown in FIG. 6, redundant description will be omitted, and only the operation will be described here with reference to the flowchart of FIG.

First, the current position information is obtained from the current position detecting means 1.
1 (step 91), the viewpoint calculation means 12 calculates the viewpoint position and the line-of-sight direction (step 92), and the map information is read from the map information storage means 15 (step 93).
Road information is drawn (step 94), neighborhood intersections are searched (step 95), and facility information is read (step 9).
Up to 6), it is the same as in the third embodiment of the present invention.

Next, based on the coordinates of the read facility information, the display target selection means 13 determines whether the facility is adjacent to the intersection closest to the current position in the traveling direction (step 97). If the facility is not adjacent to the intersection closest to the current position in the direction of travel,
The facility is not drawn. If the facility is adjacent to the intersection closest to the current position in the traveling direction, it is further determined whether or not the facility is on the back side of the intersection (step 98). Then, for the facility on the back side of the intersection, the image attribute generation means 18 sets the image attribute of the facility to display priority (step 99), and sets the image attribute to other facilities to non-priority (step 100). Next, these facilities 3
The three-dimensional image drawing means 16 draws on the display means 17 (step 101). At this time, when the image attribute is display priority, the facility is drawn by a normal display method and display color.
On the other hand, when the image attribute is not prioritized, the facility information is drawn only by its outline, or the display color is made semi-transparent so that the map information existing on the back side of the facility cannot be hidden. To draw. Then, the drawing determination and the drawing process are completed for all the facilities belonging to the map display range (step 102), and the map drawing process is completed.

FIG. 10 shows an example of the result of drawing a map near the current position according to the fourth embodiment of the present invention. As is apparent from comparison of the drawing result of FIG. 10 with the drawing result of the conventional example shown in FIG. 15, the electronic map drawing device according to the present embodiment is
While driving, first display only the information near the intersection closest to the target current position, and draw the outline of the facility in front of the intersection so that it is not conspicuous, or draw in a semi-transparent display color. Excellent effect can be obtained.

As described above, according to the fourth embodiment of the present invention, the display object selection means 13 and the image attribute generation means 18 draw only the outline of the facility in front of the intersection, or a semi-transparent display color. By drawing with, it is possible to prevent the road intersecting at the intersection from being hidden by the facility information, and it is possible to realize a map display that is easy to see.

(Fifth Embodiment) FIG. 11 shows the structure of a vehicle-mounted navigation device according to a fifth embodiment of the present invention.
FIG. 12 is a flowchart of the electronic map drawing method according to the fifth embodiment of the present invention. In FIG. 11, 19 is an operating means, which is an input device prepared for the user to set a destination, and is composed of a remote control switch. 20
Is a route searching means for calculating an optimum traveling route from the current position of the vehicle to the destination, and is composed of a microcomputer in the present embodiment. Reference numeral 20A is a guide means, which calculates a route guidance point on the travel route and guides by a screen and voice near the guidance point, and is constituted by a microcomputer in the present embodiment. Other parts are the third and fourth embodiments of the present invention shown in FIG.
Since the configuration is the same as that of 1, the duplicated description will be omitted.

The operation of the vehicle-mounted navigation device configured as described above will be described below with reference to the flowchart of FIG.

First, the present position information is obtained from the present position detecting means 1.
It is the same as that of the fourth embodiment of the present invention until it is detected in 1 (step 1201) and the viewpoint calculating means 12 calculates the viewpoint position and the line-of-sight direction (step 1202). Next, the point input by the user through the operating means 19 is set as the destination (step 1203). Next, the route search means 20 calculates an optimum traveling route from the current vehicle position to the destination (step 1204). Next, the guide means 2
The guide point on the traveling route calculated by the route searching means 20 is searched by 0A, for example, an intersection where a right turn and a left turn are made (step 1205). Next, as in the first embodiment of the present invention, the map information near the current position is read (step 12
06), the road information drawing process is performed (step 120).
7). Next, the route calculated by the route searching means 20 is drawn on the road information (step 1208). Next, as in the first embodiment of the present invention, facility information near the current position is read (step 1209).

Next, from the coordinates of the read facility information, the display target selection means 13 determines whether or not the facility is adjacent to the guide point calculated by the guide means 20A (step 1210). If the facility is not adjacent to the guide point, the facility is not drawn. If the facility is adjacent to the guide point, it is further determined whether or not the facility is on the back side of the guide point (step 1
211). Then, for the facility on the back side of the guide point, the image attribute generation unit 18 sets the image attribute of the facility to display priority (step 1212), and sets the image attribute to other facilities to non-priority (step 1213). . Next, these facilities are drawn on the display means 17 by the three-dimensional image drawing means 16 (step 1214). At this time, when the image attribute is display priority, the facility is drawn by a normal display method and display color. On the other hand, when the image attribute is not prioritized, the facility is drawn only by its outline, or the display color is made semi-transparent so that the map information existing at the back of the facility, especially the travel route, is hidden. Draw so that it does not disappear.
Then, the drawing determination and the drawing processing are completed for all the facilities belonging to the map display range (step 121).
5) The map drawing process is completed.

FIG. 13 shows an example of the result of map drawing in the vicinity of the current position according to the fifth embodiment of the present invention. As is clear from the comparison of the drawing result of FIG. 13 with the drawing result of the conventional example shown in FIG. 15, the vehicle-mounted navigation device according to the present embodiment has only the facility information near the guide point, which is the most important target during traveling. Is displayed, and the facility in front of the guide point is drawn only in its outline so as not to be conspicuous, or in a semi-transparent display color, which is an excellent effect.

As described above, according to the fifth embodiment of the present invention, the display object selection means 13 and the image attribute generation means 18 draw only the outline of the facility in front of the guide point or display it semi-transparently. By drawing in color, it is possible to prevent the traveling route from being hidden by facility information, and it is possible to realize a map display that is easy to see.

In the above description, the viewpoint calculating means 1
2, display target selection means 13, image attribute generation means 18, signal processing means 14, route search means 20, guide means 20A,
The three-dimensional image drawing means 16 has been described as an example in which it is configured by a microcomputer, but it can be similarly implemented when it is configured by using other hardware circuits.

In the above description, the viewpoint calculating means 1
2, display target selection means 13, image attribute generation means 18, signal processing means 14, route search means 20, guide means 20A,
The three-dimensional image drawing means 16 and the three-dimensional image drawing means 16 have been described by using the independent microcomputers. However, the same operation can be performed in a case where a single microcomputer is used for time division.

[0053]

As described above, according to the present invention, when the facilities on the map are displayed three-dimensionally, only the facilities near the guidance point are selected and displayed from the facility information. It is possible to display only appropriate information according to the above, and it is possible to obtain an effect that a more easily understandable display is possible.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an electronic map drawing device according to first and second embodiments of the present invention.

FIG. 2 is a flowchart for explaining the operation of the electronic map drawing device according to the first embodiment of the present invention.

FIG. 3 is a screen view showing an example of a drawing result in the electronic map drawing device according to the first embodiment of the present invention.

FIG. 4 is a flowchart for explaining the operation of the electronic map drawing device according to the second embodiment of the present invention.

FIG. 5 is a screen view showing an example of a drawing result in the electronic map drawing device according to the second embodiment of the present invention.

FIG. 6 is a schematic block diagram of an electronic map drawing apparatus according to Embodiments 3 and 4 of the present invention.

FIG. 7 is a flowchart for explaining the operation of the electronic map drawing device according to the third embodiment of the present invention.

FIG. 8 is a screen view showing an example of a drawing result in the electronic map drawing device according to the third embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of the electronic map drawing device according to the fourth embodiment of the present invention.

FIG. 10 is a screen view showing an example of a drawing result in the electronic map drawing device according to the fourth embodiment of the present invention.

FIG. 11 is a schematic block diagram of a vehicle-mounted navigation device according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart for explaining the operation of the vehicle-mounted navigation device according to the fifth embodiment of the present invention.

FIG. 13 is a screen view showing an example of a drawing result in the vehicle-mounted navigation device according to the fifth embodiment of the present invention.

FIG. 14 is a schematic block diagram of an electronic map drawing device in a conventional example.

FIG. 15 is a screen view showing an example of a drawing result by an electronic map drawing device in a conventional example.

[Explanation of symbols]

 11 current position detecting means 12 viewpoint calculating means 13 display target selecting means 14 signal processing means 15 map information storing means 16 three-dimensional image drawing means 17 displaying means 18 image attribute generating means 19 operating means 20 route searching means 20A guiding means

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Claims (15)

[Claims] 1. An electronic map drawing method of an in-vehicle navigation device for three-dimensionally displaying facilities on a map, wherein only facilities near guide map points are selected and displayed from facility information. How to draw. 2. A current position detecting means for detecting current position information of a vehicle, and a viewpoint for calculating a viewpoint position and a line-of-sight direction necessary for coordinate calculation for performing map drawing by three-dimensional image processing from the current position information of the vehicle. The map information is read from the map information storage means based on the current position information of the calculation means, the signal processing means for controlling each means, and the information to be displayed based on the viewpoint information from the read map information. An electronic map drawing device provided with a display object selection means for selecting and a three-dimensional image drawing means for performing a three-dimensional drawing process on the selected information and displaying it on the display means. 3. The electronic map drawing apparatus according to claim 2, wherein the display target selection means selects facility information adjacent to an intersection located in a line-of-sight direction based on road information and viewpoint information. 4. The electronic map drawing apparatus according to claim 2, wherein the display target selection means selects facility information adjacent to an intersection closest to the viewpoint located in the line-of-sight direction based on the road information and the viewpoint information. . 5. The information selected by the display target selection means is
5. The image attribute generation means for classifying display priority information and display non-priority information is provided, and different drawing processing is performed by the three-dimensional image drawing means based on the classified information. The electronic map drawing device described in. 6. The image attribute generation means classifies road information and facility information located far from the viewpoint as display priority information, and classifies facility information located near the viewpoint as display non-priority information. The electronic map drawing device according to claim 5. 7. The image attribute generating means classifies facility information adjacent to an intersection located in the line-of-sight direction based on road information and viewpoint information as display priority information, and classifies other facility information as display non-priority information. The electronic map drawing device according to claim 5. 8. The image attribute generation means classifies the facility information adjacent to the intersection closest to the viewpoint located in the line-of-sight direction based on the road information and the viewpoint information as the display priority information,
The electronic map drawing device according to claim 5, wherein the other facility information is classified as display non-priority information. 9. The image attribute generating means classifies road information and facility information located in a direction far from the intersection to the viewpoint as display priority information, and classifies facility information located in the viewpoint direction from the intersection as display non-priority information. The electronic map drawing device according to claim 5, wherein 10. The three-dimensional image drawing means draws only the contour line of a facility classified by the image attribute generating means as the display non-priority information, according to any one of claims 5 to 9. An electronic map drawing device described in Crab. 11. The three-dimensional image drawing means draws semi-transparently the facilities classified as the display non-priority information by the image attribute generating means.
The electronic map drawing device according to any one of 1. 12. An in-vehicle navigation device comprising the electronic map drawing device according to claim 2. 13. The in-vehicle navigation device according to claim 12, wherein the road information and the facility information adjacent to the intersection on the traveling road of the vehicle calculated by the current position detecting means are selected by the display target selecting means. . 14. A road information and an intersection on a travel route, comprising: an operation means for setting destination information based on a user's request; and a route searching means for calculating a travel route of a vehicle from the set destination information. 13. The in-vehicle navigation device according to claim 12, wherein the facility information adjacent to is sorted by the display target sorting means. 15. A display object selecting means is provided, which is provided with a guiding means for guiding and guiding at a specific intersection on a traveling route, and the road information and facility information adjacent to the intersection to be next guided by the guiding means are selected by the display target selecting means. The vehicle-mounted navigation device according to any one of claims 12 to 14, which is characterized in that.