JPH09304087A - In-vehicle navigation device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To smoothly display an image when a high drawing speed such as scrolling is required without reducing map information such as a road to be drawn. SOLUTION: Map information storage means 14, position detection means 11 for detecting the speed of the vehicle, the current position of the vehicle, and the traveling direction,
The vehicle speed, traveling direction and current position information are acquired from the position detection means 11, the operation information is acquired from the operation means 10, the map information is read from the map information storage means 14, and the display data amount selection means 15 is further acquired. The display data amount is acquired from the display device, the control device 12 for displaying the map by integrating and processing them, the display device 13 for displaying the map information and the current position, and the map scroll and the current position display state are displayed. In the operation means 10 for performing the selection operation and the display that requires a high drawing speed from the output of the operation means 10, the display data amount is reduced,
With the display data amount selection means 15 that increases the display data amount in the display that does not require a high drawing speed, the processing amount of the drawing is reduced during the scroll operation to obtain a smooth display image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle navigation device for displaying map information around an arbitrary or own vehicle position, and particularly, for scrolling map information without reducing the roads to be drawn and during high speed traveling. The present invention relates to a vehicle-mounted navigation device that can smoothly carry out general operations.

[0002]

2. Description of the Related Art Conventionally, a passenger is guided to a predetermined destination,
An on-vehicle navigation device is a device for displaying an arbitrary map. This is the speed or direction of travel of the vehicle or G
Using the current position information of the vehicle obtained by the position detection means such as a PS receiver, the map information stored in the map information storage means such as a CD-ROM is read out, and a map near the current position is displayed on a liquid crystal monitor or other display means Is a device for displaying and guiding the vehicle position and the guide route by calculating the travel route from the predetermined departure place to the predetermined destination by the route search means.

Also, in order to make it possible to smoothly scroll the map information even if the vehicle speed increases, a device is devised so that only data of a specific road type is drawn according to the vehicle speed. Has been done. Such a vehicle-mounted navigation device is disclosed in, for example, Japanese Patent Laid-Open No. 2190/1990.
No. 84 is described.

FIG. 15 shows the configuration of a conventional example of a vehicle-mounted navigation device. In FIG. 15, the vehicle-mounted navigation device is composed of speed detection means 1, operation means 2, position detection means 3, control means 4, display means 5, and map information storage means 6.

Next, the operation of the conventional example will be described.
In FIG. 15, the position information set by the operation means 2 or the position information from the position detection means 3 is set as the current position of the vehicle,
The control means 4 reads the map information around the current position and the road type of each road from the map information storage means 6, and the display means 5 displays the map information and the vehicle position mark. While the vehicle is traveling, the current position is sequentially updated based on the position information from the position detecting means 3, and the vehicle position mark is constantly moved so as to be the center of the display of the display means 5 to perform drawing. At this time, the speed detecting means 1 detects the speed, and based on this speed and the road type of each road read from the map information storing means 6, the controlling means 4
Select the road to be drawn and draw. This shortens the drawing time and enables smooth scrolling even during high-speed driving.

[0006]

However, the conventional vehicle-mounted navigation device has a problem that map information that is not displayed is generated because the amount of drawing processing is reduced by reducing the roads to be drawn. It was

The present invention solves the above-mentioned conventional problems, and provides an excellent vehicle-mounted navigation device that can smoothly perform general scrolling of map information without reducing the roads to be drawn and not limited to high speed driving. It is intended to be provided.

[0008]

In order to achieve the above-mentioned object, the present invention reduces the display data amount by the display data amount selection means for a display that requires a high drawing speed and displays it for a display that does not require a high drawing speed. A large amount of display data is displayed by the data amount selection means.
As a result, it is possible to obtain an excellent vehicle-mounted navigation device that can smoothly perform scrolling when a high drawing speed is required and can display a display image that is easy for the user to see when a high drawing speed is not required.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises: map information storage means for storing map information; and position detection means for detecting the speed of the vehicle, the current position of the vehicle, and the traveling direction. Display means for displaying the map information read from the map information storage means and the current position calculated by the position detecting means, and a map for displaying the map information read from the map information storage means on the display means. The display data amount is reduced in the display for which a high drawing speed is required from the operation means for performing scrolling and selection of the current position display state and the output of the operation means, and in the display for which a high drawing speed is not required, the display data amount is large. The display data amount selecting means to be selected, and the vehicle speed, traveling direction, and current position information from the position detecting means, and operation information from the operating means. And a control means for reading the map information from the map information storage means, further obtaining the display data amount from the display data amount selecting means, integrating these, and performing a drawing process to display the map. This has the effect that scrolling can be performed smoothly in a display that requires a high drawing speed, and a display image that is easy for the user to see can be obtained when a high drawing speed is not required.

According to a second aspect of the present invention, when the operation means is scrolling map information, the display data amount selection means reduces the display data amount, and the operation means causes the map information to be reduced. When the scroll operation is not performed, the display data amount selection means increases the display data amount. When the scroll operation is performed, the scroll is smoothly performed, and the scroll operation is not performed. Sometimes, it has an effect that the display image can be easily viewed by the user.

According to a third aspect of the present invention, when the speed of the vehicle calculated by the position detecting means is high, the display data amount selecting means reduces the display data amount, and the position detecting means. When the vehicle speed calculated in step 1 is low, the display data amount selection means increases the display data amount, and when the vehicle speed is high, the scroll is performed smoothly. Further, when the vehicle speed is low, the display image can be displayed easily for the user.

According to a fourth aspect of the present invention, when a fast response speed of the screen operation is required from the output of the operating means, the display data amount selecting means reduces the display data amount to perform the operation. When a fast response speed of the screen operation from the output of the means is not required, the display data amount selection means increases the display data amount,
When a fast response speed of screen operation is required, a display image having a high responsiveness for the user can be obtained, and when a fast response speed of screen operation is not required, the display image can be easily viewed by the user. .

According to a fifth aspect of the present invention, the display data amount selecting means reduces the number of display colors in the display requiring a high drawing speed from the output of the operating means, and the output from the operating means is changed. In a display that does not require a high drawing speed, the display data amount selection means increases the number of display colors. When a high drawing speed is required, scrolling is performed smoothly, and a high drawing speed is also provided. When it is not necessary, the display image can be displayed easily for the user.

According to a sixth aspect of the present invention, in the case of a display that requires a high drawing speed from the output of the operating means, the display data amount selecting means makes the resolution coarse and the drawing from the output of the operating means is fast. In a display that does not require processing speed, the display data amount selection means is characterized in that the resolution is made fine. When a high drawing speed is required, scrolling is smoothly performed, and a high drawing speed is not required. Sometimes, it has an effect that the display image can be easily viewed by the user.

According to a seventh aspect of the present invention, in the case of a display that requires a high drawing speed of the map information from the output of the operation means, the control means does not perform anti-aliasing processing, and the output from the operation means is fast. In a display that does not require a drawing processing speed, the control means performs an anti-aliasing process. When a high drawing speed is required, scrolling is smoothly performed, and when a high drawing speed is not needed, it is used. This has the effect of providing a display image that is easy for a person to see.

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

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a flow chart of the vehicle-mounted navigation device according to the first embodiment of the present invention. In FIG. 1, the in-vehicle navigation device selects various settings such as vehicle position setting, destination setting for route guidance, and enlargement / reduction of map information, scrolling of arbitrary map information, stop of scrolling, etc. Operating means 10 for operating and position detecting means for detecting the current position of the vehicle, traveling direction, traveling speed, etc.
11 and the vehicle speed, traveling direction, and current position information from the position detection means 11, operation information from the operation means 10, further read map information from the map information storage means 14, and display data amount. A control means 12 for acquiring display data amount from the selecting means 15, integrating and drawing them to display a map, a display means 13 for displaying the drawn map information, a road shape and a road type The map information storage means 14 stores the data and the like, and the display data amount selection means 15 for selecting the display data type and the data amount (= bit number) assigned to the display data.

In the case of this embodiment, specifically,
The operation means 10 is composed of an operation device having a plurality of buttons, a cursor and the like, the position detection means 11 is composed of a vibration gyro, a speed sensor and a GPS receiver, the control means 12 is composed of a microcomputer, and the display means 13 Is a liquid crystal display, and the map information storage means 14 is a CD-R.
The display data amount selection means 15 is constituted by an OM.

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

First, when the display data amount selection means 15 selects the display color as the display data type, the display data amount selection means 15 obtains the state of the operation means 10 from the signal of the control means 12, and step 30 In, it is determined whether or not a scroll operation is being performed, and the selection result of whether the display color is large or small is output to the control means 12.

When the scroll operation is performed, the map information in the direction corresponding to the direction of the cursor of the operation means 10 is stored in the map information storage means 14 by the control means 12 in step 31.
Read from

Next, in step 32, the control means 12 sets the display color data amount to be used for one display data point to 8 bits (= 256 colors) based on the selection result of the display data amount selection means 15, and performs drawing such as coordinate conversion. Perform preprocessing. Then, in step 33, the control means 12 draws on the display means 13.

When the scroll operation is not performed, the control means 12 reads the map information around the vehicle or at the point where the scroll is stopped from the map information storage means 14 in step 34.

Next, the control means 12 sets the display color data amount used for one display data point in step 35 to 16 bits (= 65536 colors) according to the selection result of the display data amount selection means 15,
Pre-processing such as coordinate conversion is performed.

Next, in step 36, the control means 12 calculates the intermediate color between the display color of the drawing target graphic such as road information of the map information and the display color of the background, and anti-aliasing processing for drawing a smooth graphic. Do. And step 33
In the same manner as above, the control means 12 draws on the display means 13.

An example in which the display data amount selection means 15 does not select the display color as the display data type but the resolution will be described with reference to the flowchart of FIG.

First, the display data amount selection means 15 acquires the state of the operation means 10 from the signal of the control means 12, and step 4
When 0 is selected, it is determined whether or not the scroll operation is being performed, and the selection result as to whether the resolution is coarse or fine is output to the control means 12.

Next, when the scroll operation is being performed, the map information is read in step 41 as in the case of the processing in FIG.

Next, in step 47, the control means 12 performs pre-drawing processing such as coordinate conversion based on the selection result of the display data amount selection means 15 so that the resolution of the screen becomes rough. Then, in step 43, the control means 12 draws on the display means 13 as in the processing in FIG.

When the scroll operation is not performed, the control means 12 is operated at step 44 as in the case of the processing in FIG.
By this, the map information of the vicinity of the own vehicle or the point where the scroll is stopped is read from the map information storage means 14.

Next, the control means 12 is a display data amount selection means.
Based on the selection result of 15, in step 48, pre-drawing processing such as coordinate conversion is performed so that the resolution of the screen becomes finer. Then, in step 43, the control means 12 draws on the display means 13 as in the processing in FIG.

FIGS. 4 and 5 show an example of the result of the map drawing according to FIGS. 2 and 3 showing the operation flow of the first embodiment of the present invention. As shown in FIG. 4, when the scroll operation is performed, the data amount of the display color is reduced, and the processing such as the data transfer amount of the control means 12 is reduced, whereby the smooth scroll can be realized, while the scroll operation is performed. When not performing, increase the display color data amount,
By performing the anti-aliasing process, an excellent effect can be obtained in that the display screen of the map information is easier for the user to see than the conventional screen.

Further, as shown in FIG. 5, when the scroll operation is being performed, the resolution is reduced and the control means 12 is used.
Smooth scrolling can be achieved by reducing the number of coordinate conversions and other processing. On the other hand, when scrolling is not being performed, the resolution is finer and an excellent effect is obtained in making the map information display screen easy for the user to see. To be

As described above, according to the first embodiment of the present invention, when the operation means 10 is performing the scroll operation, the display data amount selecting means 15 reduces the display data amount of the map information, By reducing the processing amount of the control means 12, it is possible to realize a smooth map display on the display means 13.

Further, when the scroll operation is not performed, that is, when the scroll is stopped, the display data amount selection means 15 increases the display data amount of the map information to make the anti-aliasing process and the resolution finer, thereby making it possible for the user. It is possible to realize easy-to-see display of map information.

(Second Embodiment) FIG. 6 shows a second embodiment of the present invention.
FIG. 3 is a flowchart of the in-vehicle navigation device in the embodiment. The configuration of the vehicle-mounted navigation device according to the second embodiment of the present invention is the same as that of the first embodiment shown in FIG. 1, and therefore redundant description will be omitted. Here, only the operation thereof will be described with reference to the flow chart of FIG. It will be described with reference to the drawings.

First, the display data amount selection means 15 acquires the speed of the vehicle calculated by the position detection means 11 from the signal of the control means 12, and compares the speed shown in FIG. 7 with the scale of the map currently displayed. Based on the relationship, it is determined in step 50 whether the current map scale is higher or lower than the vehicle speed, and the control means 12
Outputs the selection result of whether the display color is large or small.

Next, when it is determined that the vehicle is high speed, in step 51, the control means 12 reads the map information around the vehicle from the map information storage means 14.

Next, the control means 12 is a display data amount selection means.
From the selection result of 15, the display color data amount used for one display data is set to 8 bits (= 256 colors) in step 52, and pre-drawing processing such as coordinate conversion is performed. Then, in step 53, the control means 12 draws on the display means 13.

When the own vehicle is judged to be low speed, the control means 12 reads the map information around the own vehicle from the map information storage means 14 in step 54.

Next, in step 55, the control means 12 sets the display color data amount to be used for one display data point to 16 bits (= 65536 colors) based on the selection result of the display data amount selection means 15, before drawing such as coordinate conversion. Perform processing.

Next, at step 56, the control means 12 calculates an intermediate color between the display color of the drawing target graphic such as the road information of the map information and the display color of the background, and performs anti-aliasing processing for drawing a smooth graphic. To do. Then, in step 53, the control means 12 draws on the display means 13 as described above.

An example in which the display data amount selection means 15 does not select the display color as the display data type but the resolution will be described with reference to the flowchart of FIG.

First, the display data amount selection means 15 obtains the speed of the vehicle calculated by the position detection means 11 from the signal of the control means 12, and compares the speed shown in FIG. 7 with the scale of the map currently displayed. Based on the relationship, in step 60, it is determined whether the scale of the current map is higher or lower than the vehicle speed, and the control unit 12 outputs the selection result as to whether the resolution is coarse or fine.

Next, at step 61, when the own vehicle is judged to be high speed, the map information is read in the same way as the processing in FIG.

Next, at step 67, the control means 12 performs drawing preprocessing such as coordinate conversion so that the resolution of the screen becomes rougher than the selection result of the display data amount selection means 15. Then, in step 63, the control means 12 is operated in the same manner as the processing in FIG.
To draw on the display means 13.

If it is determined that the speed is low, the control means 12 reads the map information from the map information storage means 14 in step 64 as in the case of the processing shown in FIG.

Next, at step 68, the control means 12 performs drawing preprocessing such as coordinate conversion based on the selection result of the display data amount selection means 15 so as to make the screen resolution finer.

Next, as in the processing in FIG. 6, step 63
Then, the control means 12 draws on the display means 13.

FIGS. 9 and 10 show an example of the result of the map drawing according to FIGS. 6 and 8 showing the operation flow of the second embodiment of the present invention. As shown in FIG. 9, when traveling at high speed,
By reducing the data amount of the display color and reducing the data transfer amount of the control means 12, etc., smooth scrolling can be realized, while at the time of low speed traveling, the data amount of the display color is increased to perform anti-aliasing processing. By doing so, it is possible to obtain an excellent effect in making the display image of the map information easier for the user to see than before.

Further, as shown in FIG. 10, when the vehicle is traveling at a high speed, the resolution is coarse and the processing such as coordinate conversion of the control means 12 is reduced to realize smooth scrolling. On the other hand, when traveling at a low speed, An excellent effect can be obtained in that the resolution is fine and the display image of the map information is easy for the user to see.

As described above, according to the second embodiment of the present invention, when the speed of the vehicle calculated by the position detecting means 11 is high, the display data amount selecting means 15 causes the display data of the map information to be displayed. By reducing the amount and reducing the processing amount of the control means 12, it is possible to realize a smooth map display on the display means 13.

Further, when the speed of the vehicle is low, the display data amount selecting means 15 increases the display data amount of the map information, and the anti-aliasing process and the resolution are made fine to realize the display of the map information which is easy for the user to see. can do.

(Third Embodiment) FIG. 11 is a flow chart of a vehicle-mounted navigation device according to the third embodiment of the present invention. The configuration of the vehicle-mounted navigation device according to the third embodiment of the present invention is the same as that of the first embodiment shown in FIG. 1, so redundant description will be omitted. Here, only the operation will be described with reference to the flow of FIG. 11. It will be described with reference to the drawings.

First, the display data amount selection means 15 obtains the state of the operation means 10 from the signal of the control means 12, and step 7
At 0, it is determined whether or not the scale switching operation is performed, and the control unit 12 outputs the selection result indicating whether the display color is large or small.

When the scale switching operation is being performed,
In step 71, the control means 12 reads from the map information storage means 14 map information having a large scale or small map information based on the currently displayed map.

Next, in step 72, the control means 12 sets the display color data amount used for one display data point to 8 bits (= 256 colors) based on the selection result of the display data amount selection means 15, before drawing such as coordinate conversion. Perform processing. Then, in step 73, the control means 12 draws on the display means 13.

If the scale switching operation has not been performed, the control means 12 causes the operating means 10 to operate in step 77.
It is determined whether or not redrawing is to be performed based on the pressing of the redrawing button provided in the above, the non-operation time after switching the scale, and the like.

Next, in the case of redrawing, in step 74, the control means 12 reads out the map information of the selected reduced scale from the map information storage means 14.

Next, at step 75, the control means 12 sets the display color data amount used for one display data point to 16 bits (= 65536 colors) based on the selection result of the display data amount selection means 15.
Pre-processing such as coordinate conversion is performed.

Next, at step 76, the control means 12 calculates an intermediate color between the display color of the drawing target graphic such as road information of the map information and the display color of the background thereof, and performs anti-aliasing processing for drawing a smooth graphic. To do. Then, in step 73, the control means 12 draws on the display means 13 as described above.

An example in which the display data amount selection means 15 does not select the display color as the display data type but the resolution will be described with reference to the flowchart of FIG.

First, the display data amount selection means 15 obtains the state of the operation means 10 from the signal of the control means 12, and step 8
It is judged whether or not the scale switching operation is performed at 0,
The control unit 12 outputs the selection result as to whether the resolution is coarse or fine.

Next, when the scale switching operation is being performed, the map information is read in step 81 as in the case of the processing in FIG.

Next, at step 87, the control means 12 performs drawing preprocessing such as coordinate conversion so that the resolution of the screen becomes rougher than the selection result of the display data amount selection means 15. Then, in the same way as the processing in FIG.
12 is drawn on the display means 13.

If the scale switching operation has not been performed, the control means 12 determines in step 89 whether or not to redraw, as in the case of the processing in FIG.

Next, in the case of redrawing, the map information of the selected reduced scale is read from the map information storage means 14 by the control means 12 in step 84, as in the case of the processing in FIG.

Next, at step 88, the control means 12 performs drawing preprocessing such as coordinate conversion based on the selection result of the display data amount selection means 15 so as to make the screen resolution finer.
Then, similarly to the processing in FIG. 11, in step 83, the control means 12 draws on the display means 13.

FIG. 1 shows an example of the result of the map drawing according to FIGS. 11 and 12 showing the operation flow of the third embodiment of the present invention.
3, shown in FIG. As shown in FIG. 13, when the scale switching operation is being performed, the amount of display color data is reduced and the processing such as the data transfer amount of the control unit 12 is reduced, so that fast drawing can be realized, while the scale switching is performed. When no operation is performed, the amount of display color data is increased and anti-aliasing processing is performed, so that an excellent effect can be obtained in that the display image of the map information is easier for the user to see than in the past.

Further, as shown in FIG. 14, when the scale is changed, the resolution is made coarse and the processing such as coordinate conversion of the control means 12 is reduced to realize fast drawing, while the scale change operation is performed. When not present, an excellent effect can be obtained in that the resolution is fine and the display image of the map information is easy for the user to see.

As described above, according to the third embodiment of the present invention, when the scale switching operation is performed by the operating means 10, the display data amount selecting means 15 reduces the display data amount of the map information. However, since the processing amount of the control unit 12 is reduced, a quick map display can be realized on the display unit 13 and the response of the scale switching can be improved.

When the scale switching operation is not performed, the display data amount selecting means 15 increases the display data amount of the map information, and the antialiasing process and the resolution are made fine to realize the display of the map information which is easy for the user to see. can do.

In the above description, an example of improving the responsiveness by the scale switching operation by the operating means 10 has been described, but in addition, map drawing by a place name index, map drawing by facility search, and enlarged intersection drawing are performed. Alternatively, the map drawing around the destination can be similarly performed.

[0074]

As described above, the present invention reduces the processing amount of the microcomputer by reducing the number of expressive colors when the vehicle is traveling at high speed, scrolling an arbitrary map, or switching the scale. , Smooth scrolling and scale switching with excellent responsiveness can be performed, and anti-aliasing processing can be performed by increasing the number of expressive colors when driving at low speed, stopping or scrolling stopped. The effect that it is possible to make the map display image easy to see is obtained.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a vehicle-mounted navigation device according to first to third embodiments of the present invention,

FIG. 2 is a flowchart for explaining the operation of the vehicle-mounted navigation device according to the first embodiment of the present invention,

FIG. 3 is a flowchart for explaining the operation of the vehicle-mounted navigation device according to the first embodiment of the present invention,

FIG. 4 is a drawing diagram showing an example of a drawing result of the vehicle-mounted navigation device according to the first embodiment of the present invention;

FIG. 5 is a drawing showing an example of a drawing result of the vehicle-mounted navigation device according to the first embodiment of the present invention;

FIG. 6 is a flowchart for explaining the operation of the vehicle-mounted navigation device according to the second embodiment of the present invention,

FIG. 7 is a determination table used for the operation of the vehicle-mounted navigation device according to the second embodiment of the present invention;

FIG. 8 is a flowchart for explaining the operation of the vehicle-mounted navigation device according to the second embodiment of the present invention,

FIG. 9 is a drawing diagram showing an example of a drawing result of the vehicle-mounted navigation device according to the second embodiment of the present invention;

FIG. 10 is a drawing diagram showing an example of a drawing result of the vehicle-mounted navigation device according to the second embodiment of the present invention;

FIG. 11 is a flowchart for explaining the operation of the vehicle-mounted navigation device according to the third embodiment of the present invention,

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

FIG. 13 is a drawing diagram showing an example of a drawing result of the vehicle-mounted navigation device according to the third embodiment of the present invention;

FIG. 14 is a drawing diagram showing an example of a drawing result of the vehicle-mounted navigation device according to the third embodiment of the present invention;

FIG. 15 is a diagram showing a configuration of a conventional vehicle-mounted navigation device.

[Explanation of symbols]

 1 speed detection means 2, 10 operation means 3, 11 position detection means 4, 12 control means 5, 13 display means 6, 14 map information storage means 15 display data amount selection means

Claims (7)

[Claims] 1. A map information storage means for storing map information, a position detection means for detecting a speed of a vehicle, a current position and a traveling direction of the vehicle, map information read from the map information storage means and the position. Display means for displaying the current position calculated by the detecting means, and operating means for performing map scroll and selecting operation of the current position display state when the map information read out from the map information storage means is displayed on the display means. And a display data amount selection unit that selects from the output of the operation unit to reduce the display data amount for a display that requires a high drawing speed and increase the display data amount for a display that does not require a high drawing speed; The vehicle speed, traveling direction and current position information are acquired from the means, the operation information is acquired from the operation means, and the map information is read from the map information storage means. In addition, the vehicle-mounted navigation device further comprises: a control unit that acquires the display data amount from the display data amount selection unit, integrates the display data amount, and performs a drawing process to display a map. 2. The display data amount selection unit reduces the display data amount when the operation unit scrolls the map information, and the display data amount selection unit reduces the display data amount when the operation unit does not scroll the map information. The vehicle-mounted navigation device according to claim 1, wherein the display data amount selection means increases the display data amount. 3. When the speed of the vehicle calculated by the position detecting means is high, the display data amount selecting means reduces the display data amount, and the speed of the vehicle calculated by the position detecting means is low. In this case, the display data amount selection means increases the display data amount, and the vehicle-mounted navigation device according to claim 1. 4. When a fast response speed of the screen operation is required from the output of the operating means, the display data amount selecting means reduces the display data amount, and a fast response speed of the screen operation from the output of the operating means. The vehicle-mounted navigation device according to claim 1, wherein the display data amount selection unit increases the display data amount when the display data amount selection unit does not require the display data amount. 5. The display data amount selection means reduces the number of display colors in a display requiring a high drawing speed from the output of the operation means, and the display in which a high drawing speed is not required from the output of the operation means, 5. The display data amount selection means increases the number of display colors.
The in-vehicle navigation device according to any one of the above. 6. A display requiring a high drawing speed from the output of the operating means, the display data amount selecting means roughens the resolution, and a display requiring a high drawing processing speed from the output of the operating means, the display. 5. The data amount selection means makes the resolution finer.
The in-vehicle navigation device according to any one of the above. 7. In a display that requires a high drawing speed of map information from the output of the operation means, the control means does not perform anti-aliasing processing, and in a display that does not require a high drawing processing speed from the output of the operation means, 6. The vehicle-mounted navigation device according to claim 1, wherein the control means performs anti-aliasing processing.