JP3428753B2 - Road map display control method and road map display control 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 map display method and a map display device capable of displaying on a display device a road map within a range from a set present location to a destination.

[0002]

2. Description of the Related Art When a road map is displayed on a display device, a road map is displayed in a so-called bird's-eye view display format in which the road map around the vehicle's current location is displayed in an enlarged manner compared to a distance. Is known (for example, see Japanese Patent Laid-Open No. 2-267583). In the device disclosed in the above publication, data in a predetermined range is read from the map information storage means that stores road map information to create planar map data, which is stored in the original image storage means. Next, the plane map data stored in the original image storage means is processed to create bird's-eye view data, which is stored in the display data storage means, and the display device displays based on the stored contents of the display data storage means. . Thus, the device disclosed in the above publication is
The feature is that a bird's-eye view is displayed on the entire screen of the display device.

[0003]

However, when the road map is displayed in a bird's-eye view, it is difficult to grasp the sense of distance as compared with the case where a plane map is displayed. For this reason,
When the driver does not correctly recognize the current position of the vehicle, such as when traveling in an unfamiliar area, it is preferable to display the plane map rather than displaying the bird's-eye view of the road map.

However, the device disclosed in the above publication is intended to display only the bird's-eye view, and it is not possible to switch between the bird's-eye view display and the planar map display as needed. Therefore, the applicant of the present application
In No. 6-278910, we proposed a device that allows you to select either a bird's-eye view or a plan view when displaying a road map on the display device.

On the other hand, if road map data is separately provided for displaying a bird's-eye view and for displaying a plane map, a large-capacity memory is required, and a circuit scale and parts cost are limited. It is not convenient for use.

An object of the present invention is to use a common map data so as to display at least one of a bird's-eye view and a planar map on a display device without cost, and a map display control method and a map display. Providing a control device.

[0007]

The invention according to claim 1 is a road
A car controlled to display a map on the display screen of a display device
Applied to the dual road map display control method,
The current position of the vehicle is detected by the tier, and road map data is acquired.
The road map data stored in the road map storage means by
Data, and the road map data is generated by the bird's eye view generation means.
Based on the road map data acquired by the acquisition means, the table
The scale is changed in the display screen and the area around the current position of the vehicle is seen from a distance.
Enlarge and display a bird's-eye view looking down diagonally from above
And obtain the road map data by the flat map generation means.
Display screen based on the road map data acquired by the steps
A flat map with a constant scale is generated in the
One of the generated planar map and the generated bird's-eye view
On the display screen with a mark showing the current location of the issued vehicle
Display one of the two-dimensional map and bird's-eye view
It is also characterized by controlling to switch to the other display.
Of. According to the invention of claim 2, the road map is displayed on the table of the display device.
Road map display system for vehicles that is controlled to be displayed on the display screen
The vehicle position detection means is applied to
Detecting the location and using the road map data acquisition means,
The road map data stored in the diagram storage means is acquired and a bird's-eye view is obtained.
The map generation means and the road map data acquisition means
The scale is changed on the display screen based on the obtained road map data.
It will be displayed on a larger scale around the vehicle's current location from a distance.
Generate a bird's-eye view that looks down diagonally from one direction and generate a planar map
Acquired by means of road map data acquisition means
Based on the road map data, a flat scale with a fixed scale is displayed on the display screen.
A bird's-eye view generated by the display control means by generating the area map
The figure shows a mark indicating the current location of the vehicle and
Display in the first display area and generate the plan map
Part of the first display area with a mark indicating the current location of
It is controlled to display in the second display area which is
Mode in which the second display area is always displayed by the setting means
Set the mode that is not always displayed, and use the mode setting means.
According to the preset mode, the second
It is characterized by controlling whether to display the display area of
To do. The invention of claim 3 is the same as that of claim 2.
A second display area in the vehicle road map display control method
Display area, display position, map scale, display color and display method
Set at least one of a direction, depending on the setting
Characterized by displaying a second display area
Is. A fourth aspect of the present invention is a vehicle road according to the second aspect.
In the road map display control method, the second display area is set to the first display area.
A mark or the current position of the vehicle displayed in the display area
Is displayed so that it does not overlap with the recommended route.
To do. The invention of claim 5 relates to claims 1 to 4.
In the vehicle road map display control method described in any one of
Display a plan view or bird's eye view
Scroll up and mark the vehicle's current location.
It is characterized by moving the cursor on the display screen.

According to the invention of claim 6, a road map is displayed on a display device.
Road map display for vehicles controlled to be displayed on the display screen
Vehicle position applied to the control unit to detect the current location of the vehicle
The detection means and the road map data stored in the road map storage means.
Road map data acquisition means for acquiring data
Based on the road map data acquired by the data acquisition means.
Change the scale on the display screen,
Enlarged view of the area Bird's-eye view looking down diagonally from above
Bird's-eye view generation means for generating maps and road map data acquisition
Display screen based on the road map data acquired by the steps
Plane map generation means for generating a plane map with a constant scale within
And one of the generated planar map and the generated bird's-eye view
On the display screen with a mark showing the current location of the issued vehicle
Display one of the two-dimensional map and bird's-eye view
Display control means for controlling to switch to the other display.
It is characterized by getting. The invention of claim 7 is
Control to display the road map on the display screen of the display device.
It is applied to the road map display control device for vehicles,
The vehicle position detection means for detecting the ground and the road map storage means
Get the stored road map data Get the road map data
Road acquired by the acquisition means and the road map data acquisition means
Based on the road map data, the scale changes on the display screen and
From above, the area around the vehicle's current location is enlarged and displayed.
A bird's-eye view generation unit that generates a bird's-eye view that is looked down on for
Road map data acquired by the road map data acquisition means
Generates a flat map with a constant scale in the display screen based on
The plane map generation means that is used and the generated bird's-eye view
The first display area in the display screen with the mark indicating the ground
Displayed on the screen, and the generated plane map shows the current location of the vehicle.
A second table that is a part of the first display area with the mark
Display control means for controlling to display in the display area;
Mode that always displays the display area of
Display control means
According to the mode set by the mode setting means.
Characterized by controlling whether or not to display 2 display areas
It is what

The configuration of the present invention has been described above.
But the present invention is not limited to the examples.

[0010]

1 is a block diagram of an embodiment of a vehicle map display device according to the present invention. In FIG. 1, reference numeral 1 denotes a current position detection device for detecting the current position of the vehicle, for example, a direction sensor for detecting the traveling direction of the vehicle, a vehicle speed sensor for detecting the vehicle speed, and a GPS signal from a GPS (Global Positioning System) satellite. It is composed of a GPS sensor and the like. Reference numeral 2 is a map storage memory for storing road map data, which is composed of, for example, a CD-ROM and its reading device. The road map data stored in the map storage memory 2 mainly includes road data, name data, background data, and the like. In addition, the map storage memory stores road map data of a plurality of map scales.

Reference numeral 3 is a control circuit for controlling the entire apparatus,
It consists of a microprocessor and its peripheral circuits. 4 is an input device for inputting the destination of the vehicle, 5 is a memory for plane map data that stores road map data used when a plane map of the road map viewed from directly above is displayed on the display device, 6 is a road map 3 is a bird's-eye view data memory for storing road map data used when displaying the bird's-eye view. An image memory 7 stores image data to be displayed on the display device 8. The image data stored in the image memory 7 is appropriately read and displayed on the display device 8. Reference numeral 9 is an antenna for receiving traffic information transmitted from a beacon receiver (not shown) or the like.

FIG. 2 is a flow chart showing the main processing of the control circuit 3, and the operation of this embodiment will be described below based on this flow chart. The control circuit 3 starts the process of FIG. 2 when the key is operated to the ignition on position. In step S1 of FIG. 2, a recommended route and a destination are set. The destination is set by the operator via the input device 4, and the recommended route is automatically set by calculation using, for example, the well-known Dijkstra method. Alternatively, the recommended route candidates may be stored in advance in the ROM or the like, and any one of them may be selected as the recommended route.

In step S2, the display screen mode is set. The display screen modes set here include, for example, the following eight modes. The operator selects these modes via the input device. Mode in which the window screen is always displayed Mode in which the window screen is not always displayed Mode in which the window screen is automatically displayed when approaching a predetermined guidance point on the recommended route Mode in which the window screen is automatically displayed when traffic / guidance information is received The base screen is a bird's-eye view, the window screen is a plane map, the mode base screen is a bird's-eye view, the window screen is a bird's-eye view, the mode base screen is a two-dimensional map, the window screen is a bird's-eye view. Is a plan map. The base screen refers to the entire display screen of the display device 8, and the window screen refers to a screen displayed in part of the base screen.

In step S3, the display environment is set.
There are the following five display environments set here, for example. The operator selects these display environments via the input device 4. Window screen size setting Base screen and map scale setting in window screen Setting display position of window screen Setting display color of base screen and window screen Setting display direction of base screen and window screen

In step S4, the current position of the vehicle is detected. In step S5, a map display process whose details are shown in FIGS. By performing this processing, for example, a road map as shown in FIG. 6 is displayed. FIG. 6 shows an example in which a bird's-eye view is displayed on the base screen and a plane map is displayed on the window screen. In step S6, the current position of the vehicle is detected as in step S4. In step S7, it is determined whether or not the road map on the screen is updated, that is, whether or not the road map is rewritten. Here, it is determined that the road map is updated, for example, when the vehicle travels for a predetermined distance or more, or when the operator instructs scrolling through the input device 4.

If the determination in step S7 is affirmative, the process returns to step S5, and if the determination is negative, the process proceeds to step S8. In step S8, it is determined whether to continue the main process of FIG. For example, when a power switch (not shown) is turned off or a switch for stopping the process is operated, the determination in step S8 is denied and the main process of FIG. 2 is ended.

If the determination in step S8 is affirmative, the process proceeds to step S9, the display of the attached information is updated, and then the process returns to step S6. Here, the attached information indicates, for example, a vehicle position mark displayed at the current position of the vehicle. In step S9, the display position of the accessory information such as the vehicle position mark is changed according to the traveling distance of the vehicle. When the vehicle position mark is displayed on both the base screen and the window screen, the display positions of both vehicle position marks are changed.

3 to 5 are flow charts showing details of the map display processing in step S5 of FIG. In step S101 of FIG. 3, it is determined whether the road map displayed on the base screen is a bird's eye view. Here, step S2 of FIG.
Judgment is made based on the display screen mode set in. If the determination in step S101 is affirmative, the process proceeds to step S102, the bird's-eye view display process shown in detail in FIG. 4 is performed, and the bird's-eye view is displayed in the base screen display area on the screen.

On the other hand, if the determination in step S101 is negative, the process proceeds to step S103, the planar map display processing shown in detail in FIG. 5 is performed, and a bird's-eye view is displayed in the base screen display area on the screen. When the process of step S102 or S103 ends, the process proceeds to step S104 to determine whether to display the window screen. Here, the determination is made based on the display screen mode set in step S2 of FIG.

If the determination in step S104 is affirmative, the flow advances to step S105 to determine whether or not the road map displayed on the window screen is a bird's-eye view. This determination is also made based on the display screen mode set in step S2 of FIG. If the determination in step S105 is affirmative, the process proceeds to step S106, and the bird's-eye view display process shown in detail in FIG. 4 is performed to display the bird's-eye view in the window screen. On the other hand, if the determination in step S105 is negative, step S107
Then, the process goes to step 2 to execute the plane map display processing, the details of which are shown in FIG. 5, to display the plane map in the window screen. Step S10
When the process of 6 or S107 is completed, or when the determination of step S104 is negative, the process proceeds to step S108, and accessory information such as a vehicle position mark is displayed on both the base screen and the window screen and the process returns.

FIG. 4 is a flow chart showing details of the bird's-eye view display processing of step S102 of FIG. In step S201 of FIG. 4, the display direction angle when performing the bird's-eye view display is calculated. FIG. 7 is a diagram illustrating a method of calculating the display direction angle α. The XY axes shown in the figure indicate the road map plane, the origin O indicates the starting point of the vehicle, the coordinates G (X0, Y0) indicate the current position of the vehicle, and the coordinates P1 (X1, Y1) indicate the destination. As shown in the figure, the display direction angle α is the angle between the X-axis and the line segment (the dotted line in the figure) connecting the current position G and the destination P1 and is represented by the equation (1).

Tan α = {(Y1−Y0) / (X1−X0)} (1) In step S201, the display direction angle α is obtained based on the equation (1).

In step S202, step S in FIG.
Road map data around the current position is read from the map storage memory 2 based on the current position detected in step 4 and the display direction angle α calculated in step S201. For example, the road map data of several 10 km square including the current location is read.

In step S203, step S202
The data used when displaying the bird's-eye view is selected from the road map data read in step 3, and the selected data is stored in the bird's-eye view data memory 6. Here, in order to reduce the data amount of the road map information displayed on the display device 8, only the data whose data type satisfies a predetermined condition is extracted and stored in the bird's-eye view data memory 6. In step S204, the road map data selected in step S203 is converted into bird's-eye view data.

FIG. 8 is a diagram for explaining the conversion to bird's-eye view data, where the road map is the XY plane, the viewpoint M is placed on the Z axis orthogonal to the XY plane, and the angle of looking down from the viewpoint M is φ.
Here is an example. The rectangle abcd shown in the figure shows the display range of the display device 6 as enlargedly displayed in FIG. 9, and the trapezoid ABCD of FIG. 8 shows the road map range displayed on the display device 6. In order to convert the road map data into the bird's-eye view data, first, the height Z of the viewpoint M and the looking-down angle φ from the viewpoint M can be displayed so that all the road map data in the trapezoidal area ABCD shown can be displayed on the display device 6. After defining the spread angle θ from the viewpoint, the bird's-eye view data projected on the rectangular area abcd in FIG. 8 is created using these parameters. At this time, the looking-down angle φ is set such that the vicinity of the center line connecting the midpoints of the upper side and the lower side of the display screen of the display device 6 becomes the destination direction.

Returning to FIG. 4, in step S205, the bird's-eye view data converted in step S204 is displayed on the display device 8.
It is converted to the final map image data to be displayed on and returned.

FIG. 5 is a flow chart showing the planar map display processing of step S103 of FIG. In step S301 of FIG. 5, a road map around the current position of the vehicle is read from the map storage memory 2. In step S302, the data used for displaying the plane map is selected from the road map data read in step S301, the selected data is stored in the plane map data memory 5 as the plane map data, and the process returns. . Here, similarly to step S203 of FIG. 4, data with high priority is selected. In step S303, the plan map data stored in the plan map data memory 5 is converted into map image data, stored in the image memory 7, and the process returns.

2 to 5 described above, the control circuit 3 sets the destination and recommended route of the vehicle, and then sets the screen display mode and the display environment. Next, the base screen is displayed. At that time, when the bird's-eye view is displayed on the base screen, after the road map data read from the map storage memory 2 is stored in the bird's-eye view data memory 6, the bird's-eye view data is converted and the converted bird's-eye view data is stored in the image memory. Store in 7. On the other hand, when a two-dimensional map is displayed on the base screen, the road map data read from the map storage memory 2 is stored as the two-dimensional map data in the two-dimensional map data memory 5 and then transferred to the image memory 7.

Next, it is determined whether or not the window screen is displayed, and when the bird's-eye view is displayed on the window screen, the bird's-eye view data memory 6 is used to perform conversion to the bird's-eye view data as in the base screen, and the window is displayed. When a plane map is displayed on the screen, the plane map data is created using the plane map data memory 5 as in the base screen.

As described above, according to the present invention, the map storage memory 2 which is a common map database is used for displaying the bird's-eye view and the plane map on the display device 8. It is not necessary to provide a dedicated map storage memory, and the cost and the mounting area can be reduced. Further, since the bird's eye view data memory 6 and the plan map data memory 4 for storing the data to be displayed on the display device 8 are provided, the display can be switched between the bird's eye view and the plan map quickly.

In the above embodiment, when the base screen and the window screen are displayed at the same time, the map scale in the window screen is adjusted so that the entire road map range displayed in the base screen is displayed in the window screen. May be set automatically. In the above embodiment, an example in which the display position of the window screen is changed according to the instruction of the operator has been described, but the window screen may be automatically displayed at a position that does not overlap the vehicle position mark and the recommended route. .
In the above embodiment, a switch for separately scrolling the base screen and the window screen may be provided. For example, when a switch for scrolling the window screen is operated, the road map may be scrolled according to the operation, and at the same time, the vehicle position mark may be moved.

In the above embodiment, the display screen mode and the display environment are set in the main processing by the control circuit 3 shown in FIG. 2. However, even if the display screen mode and the display environment are set by the interrupt processing. Good. That is, when the operator gives an instruction to change the display screen mode or the display environment via the input device 4, the process of the control circuit 3 may be interrupted to change the settings such as the display screen mode. As a result, the mode can be changed quickly.

In the embodiment configured as described above, the map storage memory 2 serves as the road map storage means, the control circuit 3 serves as the display control means, the current location detection device 1 serves as the vehicle position detection means, and the bird's-eye view of FIG. Display processing is a bird's eye view data conversion means,
The flat map display processing of FIG.
The bird's-eye view data memory 6 corresponds to bird's-eye view conversion data storage means, and the plan map data memory 5 corresponds to plan map creation data storage means.

[0033]

As described in detail above, according to the present invention, for example, a bird's-eye view can be performed based on common road map data.
Since the figure and the plan map are displayed, it is not necessary to provide map data dedicated to each map , and cost reduction and mounting area reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a vehicle map display device according to the present invention.

FIG. 2 is a flowchart showing main processing of a control circuit.

FIG. 3 is a flowchart showing a map display process of a control circuit.

FIG. 4 is a flowchart showing a bird's-eye view display process of a control circuit.

FIG. 5 is a flowchart showing a planar map display process of the control circuit.

FIG. 6 is a diagram showing an example in which a bird's-eye view is displayed on the base screen and a plane map is displayed on the window screen.

FIG. 7 is a diagram illustrating a method of calculating a display direction angle α.

FIG. 8 is a diagram illustrating conversion into bird's-eye view data.

9 is an enlarged view of the rectangular area abcd shown in FIG.

[Explanation of symbols]

1 Current location detector 2 map storage memory 3 control circuit 4 input device 5 Memory for plane map data 6 Bird's eye view data memory 7 Image memory 8 display devices 9 antenna

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A 64-17200 (JP, A) JP-A 62-212776 (JP, A) JP-A 62-79312 (JP, A) JP-A 61- 95386 (JP, A) JP-A-6-331372 (JP, A) JP-A-6-83937 (JP, A) JP-A-5-203457 (JP, A) JP-A-5-134600 (JP, A) JP-A-5-118864 (JP, A) JP-A-5-46084 (JP, A) JP-A-4-335390 (JP, A) JP-A-3-266086 (JP, A) JP-A-3-225391 (JP, A) JP-A-3-129480 (JP, A) JP-A-2-267583 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G09B 29/00-29 / 14 G01C 21/00 G08G 1/0969

Claims (7)

(57) [Claims] 1. A vehicle road map display control method for controlling a road map to be displayed on a display screen of a display device, wherein a vehicle position detection means detects a current location of a vehicle, and a road map data acquisition means A road map storage means
The stored road map data is acquired, and the bird's-eye view generation means causes the road map data acquisition means to
Therefore , based on the road map data acquired , the display screen
The scale of the vehicle changes and the area around the current location of the vehicle is expanded from a distance.
A bird's-eye view that is viewed diagonally from above is generated, and the road map data acquisition unit is generated by the plane map generation unit.
Based on the road map data acquired by said display image
A planar map having a constant scale in the plane is generated, and one of the generated planar map and the generated bird's-eye view is displayed by the display control means as the current position of the detected vehicle.
A road map display system for a vehicle , characterized in that it is displayed on a display screen together with a mark , and one of the displayed planar map and the bird's-eye view is controlled to be switched to the other display.
Your way. 2. A road map is displayed on a display screen of a display device.
Is a road map display control method for a vehicle, The vehicle position detection means detects the current position of the vehicle, By means of the road map data acquisition means, it is stored in the road map storage means.
Acquire the paid road map data, By the bird's-eye view generation means, the road map data acquisition means
Therefore, based on the road map data acquired, the display screen
The scale of the vehicle changes and the area around the current location of the vehicle is expanded from a distance.
Generate a bird's-eye view that looks down diagonally from above
Then The road map data acquisition means by the plane map generation means
Based on the road map data acquired by
Generate a planar map with a constant scale in the plane, The display control means displays the generated bird's-eye view on the vehicle.
With the mark indicating the current location of
Displayed in the display area of Figure above
Along with the mark indicating the current location of the vehicle, the first display area
Control to display in the second display area that is part of the area
Then The second display area is constantly displayed by the mode setting means.
Set the mode to be displayed and the mode that is not always displayed, According to the mode set by the mode setting means,
The display control means displays the second display area.
Vehicle road map table characterized by controlling whether or not
Show control method. 3. At least one of a display area, a display position, a map scale, a display color, and a display direction of the second display area is set, and the second display area is set according to the setting. 3. The vehicle road map display system according to claim 2, which is displayed.
Your way. 4. A vehicle according to claim 2, wherein the displaying so as not to overlap with the second display area the first display region to the mark or the recommended route indicate the current location of the vehicle to be displayed use road map display control method. 5. A with scrolling the planar map or a bird's-eye view is the display on the display screen, the vehicle
The vehicle according to any one of claims 1 to 4 , wherein a mark indicating both current positions is moved on the display screen.
Use road map display control method. 6. A road map is displayed on a display screen of a display device.
A road map display control device for a vehicle, Vehicle position detection means for detecting the current location of the vehicle, Acquires the road map data stored in the road map storage means.
Road map data acquisition means, Road map acquired by the road map data acquisition means
Based on the data, the scale changes in the display screen and
From the top, which shows an enlarged view of the area around the current location of the vehicle
A bird's-eye view generation unit that generates a bird's-eye view that is viewed obliquely; Road map acquired by the road map data acquisition means
Based on data, a flat surface with a constant scale in the display screen
A plane map generating means for generating a diagram, One of the generated planar map and the generated bird's-eye view
Is displayed with a mark indicating the current location of the detected vehicle.
Displayed on the display screen, and the above-mentioned plan map and bird's-eye view
Display system that controls to switch one display to the other
Road map display for vehicles characterized by including control means
Control device. 7. A road map is displayed on a display screen of a display device.
A road map display control device for a vehicle, Vehicle position detection means for detecting the current location of the vehicle, Acquires the road map data stored in the road map storage means.
Road map data acquisition means, Road map acquired by the road map data acquisition means
Based on the data, the scale changes in the display screen and
From the top, which shows an enlarged view of the area around the current location of the vehicle
A bird's-eye view generation unit that generates a bird's-eye view that is viewed obliquely; Road map acquired by the road map data acquisition means
Based on data, a flat surface with a constant scale in the display screen
A plane map generating means for generating a diagram, The generated bird's-eye view is a mark indicating the current location of the vehicle.
Together with the display in the first display area in the display screen.
The generated planar map showing the current location of the vehicle.
A second mark which is a part of the first display area together with the mark
Display control means for controlling to display in the display area of The second display area is always displayed in the mode
Equipped with mode setting means for setting a non-existent mode, The display control means is set by the mode setting means.
Whether to display the second display area according to the selected mode.
Road map display system for vehicles characterized by controlling whether or not
Your device.