JPH07146645A - Map information system - Google Patents

Abstract

PURPOSE:To facilitate the check of map information during driving and to enable a driver to make safe and exact driving operation by forming and displaying the map information reduced from read out map information according to a distance from a present position. CONSTITUTION:Vector conversion is executed in a CPU in accordance with the map information, present position information and progressing direction information determined by its accumulated value and this display data is displayed on a DISPLAY. The vector conversion in such a case is executed by calculating the progressing direction and progressing speed of the car from the position information of the last time and the position information of this time and segmenting a screen more widely for a place of the longer distance from the car position with respect to the progressing direction as shown in, for example, (a) in accordance with the progressing direction and progressing speed of the car. The range to be segmented in accordance with the progressing direction of this time is varied as shown in (A) to (C). The vector conversion is executed by thinning or interpolating the segmented road map information so as to meet the actual display region as shown in (b) to (d) respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map information system, and more particularly to a map information system used for a navigation device or the like for recognizing the position of a moving body.

[0002]

2. Description of the Related Art Recently, a car navigation system utilizing map information and various town guide systems are being developed, and it is expected that the map information system will be spread in various fields. Conventionally, GPS (Global Position)
ing system) and the like to detect the position of the moving body, display the detected position information together with map information on a display device, and recognize the position of the moving body.

[0003]

However, in the map information system used for such a conventional navigation device or the like, the map information used for the navigation device or the like is viewed from directly above, like the map of the printed matter. Since the data was recorded in the form of the display and the playback was also displayed in this form, the position of the vehicle, the destination and the route already traveled are all displayed at equal magnification, and the map information cannot be viewed in a wide area.
There is a problem that it is difficult to recognize the vehicle position on the map information.

That is, (1) it is difficult for the driver to instantly determine the information necessary for the most recent operation, (2) it is difficult to know the position of the vehicle on the map, (3) it is difficult to know the traveling direction and the destination, etc. There was a drawback.

Therefore, an object of the present invention is to provide a map information system which enables a driver to safely and accurately perform a driving operation by easily confirming the map information during driving.

[0006]

According to a first aspect of the present invention, there is provided a map information system which stores at least map information representing roads, a current position detecting means which detects a current position of a moving body, and a current position detecting means. Conversion means for converting the map information read from the map information storage means into map information reduced in accordance with the distance from the current position based on the current position of the moving body detected by the current position detection means; The above-mentioned object is achieved by including display control means for controlling the display of the map information converted by the conversion means.

In this case, the map information system is, for example,
As described in claim 2, it may further include self-position information generation means for synthesizing the current position of the moving body detected by the current position detection means on the map information converted by the conversion means.

According to a third aspect of the map information system of the present invention, at least a map information storage means for storing map information representing a road, a vector detection means for detecting a traveling direction and a traveling speed of a moving body, and the map information storage. The map information read from the means is provided with a conversion means for converting the vector based on the output of the vector detection means, and a display control means for controlling the display of the map information vector-converted by the conversion means. You have achieved your purpose.

In this case, the conversion means may change the conversion magnification according to the distance from the moving body, as described in claim 4, for example.

Further, as described in claim 5, map information in a range close to the moving body is enlarged and displayed, and is converted so that a wide area can be displayed as the distance from the moving body increases. May be.

Further, in the case of claim 3, the traveling direction detecting means is, for example, as described in claim 6, GPS
The direction of travel may be detected by (Global Positioning System).

Further, in the case of claim 1 or claim 2,
The conversion means is, for example, as described in claim 7,
The reduction process is performed on the map information read from the map information storage unit by expanding the address interval for reading the map information from the map information storage unit according to the distance from the current position of the mobile body. Alternatively, for example, as described in claim 8, logarithmic calculation processing is performed on a distance corresponding to each position on the map information read from the map information storage means from the current position of the mobile body. The reduction processing may be performed on the map information read out from the map information storage means by performing.

Further, the converting means may be, for example, a device according to claim 9.
As described in, the map read from the map information storage means by performing a square root calculation process for the distance corresponding to each position on the map information read from the map information means from the current position of the mobile body. The reduction processing may be performed on the information.

Further, in the case of claim 8 or claim 9,
As described in claim 10, for example, the conversion means converts a distance corresponding to each position on the map information read from the map information storage means from the current position of the moving body into a polar coordinate value, and the polar coordinate value. The calculation process may be performed on the value, and as described in claim 11, it corresponds to each position on the map information read by the map information storage means from the current position of the moving body. The distance may be converted into an orthogonal characteristic value, and the arithmetic processing may be performed on the orthogonal coordinate value.

Further, in the case of claim 1 or claim 2, the conversion means is, for example, as described in claim 12,
With the current position of the moving body as the center, a reduction process for changing the compression rate from the current position of the moving body to the position on the map information as seen through a fisheye lens The read map information may be converted into the reduced map information.

In a twelfth aspect, the conversion means changes the compression rate of the map information stored in the map information storage means as if seen through the fisheye lens, as in the thirteenth aspect. A conversion value storage unit that stores a conversion value when performing compression processing is provided, and the map information read from the map information storage unit is converted into the reduced map information based on the conversion value stored in the conversion value storage unit. It may be one.

In the thirteenth aspect of the present invention, for example, in the conversion means, as described in the fourteenth aspect, the conversion value storage means stores only the conversion value in the first quadrant of a predetermined coordinate space,
All the map information read from the map information storage means may be converted into the reduced map information based on the conversion value of the first quadrant stored in the conversion value storage means.

Further, in each of the cases, the map information system, for example, as described in claim 15, based on the reduction ratio of the map information converted by the conversion means, the background color of the converted map information. Further, an image processing unit for changing can be provided.

The map information system may be, for example,
The image pickup means for picking up an image of the situation in the traveling direction, and the image combining means for combining the image picked up by the image pickup means with the map information converted by the conversion means. May be.

Further, the present position detecting means may detect the present position of the moving body by GPS, for example, as described in claim 15.

[0021]

According to the map information system of the present invention, the map information read out from the map information storage means for storing at least the map information representing the road based on the current position of the moving body detected by the current position detection means. Since the map information that is reduced according to the distance from the current position is generated and displayed, the map information near the current position of the moving body is displayed in a large and detailed manner, and is reduced and displayed as the distance from the moving body is increased. It As a result, it becomes easy to confirm the map information while driving, and the driver can safely and accurately perform the driving operation.

In this case, as described in claim 2, self-position information generating means for synthesizing the current position of the moving body detected by the current position detecting means on the map information converted by the converting means is further provided. With the provision, the map information in which the current position is combined can be displayed, the current position on the map information can be easily confirmed, and the map information during driving can be confirmed more easily. As a result, the driver can perform a safer and more accurate driving operation.

According to the map information system of the third aspect of the present invention, the map information read from the map information storage means is converted into the output of the vector detection means for detecting the traveling direction and the traveling speed of the moving body. Since the vector information is converted based on the map information and the vector-converted map information is displayed, the map information during driving can be easily confirmed, and the driver can perform a safe and accurate driving operation.

In the case of claim 3, when the conversion means changes the conversion magnification in accordance with the distance from the moving body as described in claim 4, for example, the conversion magnification corresponding to the distance of the moving body is changed. Since vector conversion can be performed, it is possible to more easily confirm map information during driving.

Further, in the case of claim 3, the converting means is
For example, as described in claim 5, when the map information in the range close to the moving body is enlarged and converted so that a wider area can be displayed as the distance from the moving body increases, the moving body can be displayed. It is possible to more easily confirm the map information closer to, and it is possible to confirm the map information far from the moving body in a wide range.

Further, the signal direction detecting means may be, for example, a GPS (Global Posi).
If the traveling direction is detected by a motion system, the traveling direction can be accurately detected with a simple device.

Further, in the case of claim 1 or claim 2, for example, as described in claim 7, the converting means stores the map information in the map information storage means in accordance with the distance from the current position of the moving body. If the reduction process is performed by converting the reduced map information by expanding the address interval for reading the map information, the map information can be easily reduced and the map information system can be made inexpensive. be able to.

[0028] Further, the conversion means is, for example, as defined in claim 8.
As described in, by performing a logarithmic calculation process on the distance corresponding to each position on the map information read from the map information storage means from the current position of the moving body,
If the reduction processing is performed on the map information read from the map information storage means, the map information near the moving body can be displayed in detail by a simple calculation process, and a wider range of map information is displayed. can do.

Further, as described in claim 9, the converting means calculates a square root with respect to a distance corresponding to each position on the map information read from the map information means from the current position of the moving body. When the reduction processing is performed on the map information read out from the map information storage means by performing the processing, the map information near the moving body can be displayed in detail by a simple arithmetic process, and A wide range of map information can be displayed.

In the case of claim 8 or claim 9, for example, the conversion means, as described in claim 10, each position on the map information read by the map information storage means from the current position of the moving body. If the distance corresponding to is converted into a polar coordinate value and the calculation processing is performed on the polar coordinate value, it is possible to display the map information reduced in a circular shape with the position of the moving body as the center, and The person can more easily confirm his / her position and can know the map information of the surrounding area in a wide range.

Further, the converting means may be, for example, as defined in claim 1.
As described in 1, the distance corresponding to each position on the map information read by the map information storage means from the current position of the moving body is converted into an orthogonal characteristic value, and the arithmetic processing is performed on the orthogonal coordinate value. By doing so, the map information on the front side of the moving body can be displayed in a wide range, and the map information necessary for the future progress of the moving body can be known abundantly.

Further, in the case of claim 1 or claim 2, for example, as described in claim 12, the conversion means is centered on the current position of the moving body, and the map is calculated from the current position of the moving body. By performing a reduction process for changing the compression ratio for the position on the information as seen through the fisheye lens, the map information read from the map information storage means is converted into the reduced map information,
It is possible to display reduced map information in a state where the surroundings are photographed with a fisheye lens centering on the position of the moving body, so that the driver can more easily confirm his / her position and the map information of the surroundings is displayed. You can know a wide range.

In the twelfth aspect, for example, as described in the thirteenth aspect, the conversion means changes the compression rate of the map information stored in the map information storage means as if seen through the fisheye lens. When the conversion value at the time of compression processing is stored in the conversion value storage means and the map information read from the map information storage means is converted into the reduced map information based on the conversion value, the map information storage means outputs the converted map information. The read map information can be converted into reduced map information at high speed, and the processing speed can be improved.

Further, for example, as described in claim 14, only the conversion value of the first quadrant of the predetermined coordinate space is stored in the conversion value storage means, and the conversion value is the conversion value of the first quadrant. If all the map information read out from the map information storage means is converted into the reduced map information based on the above, the storage capacity of the converted value storage means can be reduced and the reduced map information can be quickly converted into the reduced map information. Can be converted.

In each of the above cases, the map information system sets the background color of the converted map information on the basis of the reduction ratio of the map information converted by the converting means, as described in claim 15, for example. If the image processing means for changing is further provided, the reduced state can be easily confirmed, and the map information during driving can be more easily confirmed.

Further, the map information system is, for example,
The image pickup means for picking up an image of the situation in the traveling direction, and the image combining means for combining the image picked up by the image pickup means with the map information converted by the conversion means. If so, the map information and the image of the progress situation can be viewed at the same time, the confirmation of the map information can be more easily confirmed, and the driver can further safely and accurately perform the driving operation.

Further, when the current position detecting means detects the current position of the moving body by GPS, for example, as described in claim 17, the current position can be accurately detected by a simple device. can do.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

<First Embodiment> FIGS. 1 to 3 are views showing a first embodiment of a map information system according to the present invention, which is an example in which the map information system is applied to a car navigation device.

First, the structure will be described.

FIG. 1 shows the position information obtained by GPS (Global Posi).
FIG. 1 is an overall configuration diagram of a car navigation device that is calculated by using the motionation system).

In FIG. 1, a car navigation system 1
0 is a CPU (Central Processing Unit) 11 and a ROM
(Read Only Memory) 12, RAM (Random Access Me
mory) 13, VRAM 14, key input unit 15, GPS
(Global Positioning System) processing unit (hereinafter G
PS) 16, CD-ROM (Compact Disc ReadO)
nly Memory) 18, CD-ROM demodulation circuit 19, DD
(Display Driver) Circuit 20, Display (DISPLA
Y) 21 and the like.

The ROM 12 stores programs for the car navigation device 10, various fixed data, and the like.

The CPU 11 calculates values necessary for various operations while exchanging data with the RAM 13 in accordance with a control microprogram stored in the ROM 12, and the DD circuit 20 based on the processed data. It outputs a control signal for controlling the etc.

Specifically, the CPU 11 has a GPS 16
Current position information (position, direction, speed) from CD-R
Map information is input from the OM 18, and the CPU 11 sets C
Map information and GPS 16 input from the D-ROM 18
A conversion process for vector-converting map information is executed based on processing information such as current position information input from
The control is performed so that the LAY 21 displays easy-to-understand map information.

The RAM 13 is used as a so-called working memory for temporarily storing data relating to car navigation control, data used for calculation, calculation results, etc., and the CPU 11 controls each part of the car navigation device 10 according to the programs in the ROM 12. Then, it is made to function as the car navigation device 10.

The VRAM 14 is a RAM area for storing characters and figures to be displayed on the DISPLAY 21, and is a VRA.
M14 stores the map information read from the CD-ROM 20, the position image information coordinate-converted by the CPU 11, and the like.

The key input unit 15 is a keyboard equipped with a call switch, various data inputs, mode selection, function keys, etc., and outputs instructions of each key to the CPU 11.

The GPS 16 includes a GPS antenna 16a and a demodulation circuit 16b. The GPS 16 receives a GPS satellite signal transmitted from three to four GPS satellites by an antenna 16a, calculates a position in real time from a propagation time of the received GPS satellite signal by a demodulation circuit 16b, and calculates a two-dimensional or three-dimensional position. It is a position detection device that calculates the position information of the original moving body. In addition, the GPS 16 determines the direction from the accumulated position (calculated from the previous position and the current position)
And velocity (time difference of the difference between the previous position and the current position) are calculated by the demodulation circuit 16b, and the current position, direction and velocity are calculated by C
Output to PU11.

The CD-ROM 18 uses a CD (compact disc) as a read-only storage medium, and stores data such as map information and traffic information in this embodiment.

The demodulation circuit 19 demodulates the signal read from the CD (compact disc) and outputs it to the CPU 11.

The DD circuit 20 is a circuit for driving the DISPLAY 21 in order to display an image by the DISPLAY 21 based on the display data expanded in the VRAM 14, and more specifically, the input display signal is predetermined by a predetermined pixel. Converted to a bit analog video signal, DISP
It is output to the LAY 21.

The DISPLAY 21 is a CRT.
(Cathode-Ray Tube), LCD (Liquid Crystal Disp
lay) and the like are conceivable, but an LCD is preferable in view of miniaturization. The LCD is a TFT (Thin Film Transistor) which is one of the active matrix systems.
If a color liquid crystal display device having a type liquid crystal display panel is used, fine halftone control can be performed, a high contrast ratio can be secured, and the display is easier to see.

2A and 2B are views showing a display example of the map information and the road information displayed on the DISPLAY 21 based on the data from the CD-ROM 18, and FIG.
FIG. 2A shows the road map information before vector conversion read from the CD-ROM 18 as shown in FIGS. 2B, 2C, and 2D.
2 shows the road information after the CPU 11 has performed the vector conversion processing on the road map information shown in FIG.

In the display example of FIG. 2 (a), reference numeral 31 denotes a moving body (own vehicle) such as a vehicle displayed on the map, and the position of the own vehicle 31 on the road map 32a as shown in FIG. Is displayed. 2B, 2C, and 2D, the position of the vehicle 31 is displayed on the vector-converted road map 32b, and the vehicle 31 tries to pass through. Roads are displayed with a sense of perspective.

Next, the operation of this embodiment will be described.

The map information recorded in the CD-ROM 18 is demodulated by the demodulation circuit 19 and input to the CPU 11. The CPU 11 performs vector conversion based on the map information from the CD-ROM 18, the current position information from the GPS 16 and the traveling direction information determined from the cumulative value thereof, and transfers the vector-converted map information to the VRAM 14. The display data transferred to the VRAM 14 is displayed on the DISPLAY 21 by the DD circuit 20.

In the vector conversion performed by the CPU 11, the traveling direction and traveling speed of the vehicle are calculated from the previous position information and the current position information (the traveling direction and the traveling speed are called vectors), Based on the traveling direction and traveling speed of the vehicle, for example, as shown in FIG. 2A, the screen is cut out wider than the place farther from the vehicle position in the traveling direction. At this time, the range to be cut out based on the traveling direction is changed as shown in (a), (a), and (c) of FIG. 2A ((a) high speed, (a) medium speed, (c)). Slow). Then, as shown in FIGS. 2B, 2C, and 2D, the cut-out road map information is thinned out or interpolated so as to match the actual display area, whereby vector conversion is performed. .

FIG. 3 is a flow chart showing a program for map information conversion processing executed by the CPU 11, and this flow starts the processing when the conversion mode is selected by the key input unit 15.

First, in step S1, a vector (a traveling direction and a traveling speed) is calculated based on the current position information from the GPS 19 and its accumulated value, and in step S2, the vector (FIG. 2A) is calculated according to the calculated vector amount. ), The image is cut out.

Next, in step S3, as shown in FIG. 2 (a), images cut out wider than the place farther from the vehicle position are shown in FIGS. 2 (b), 2 (c) and 2 (d). This display image is converted into a display image that returns to such a rectangle, the converted image is output to the VRAM 14, and this flow ends.

By executing the above map information processing,
Map information is displayed as shown in FIGS. 2B, 2C, and 2D according to the vector amount. 2 (b),
In the display examples of (c) and (d), the information of the area close to the own vehicle position is enlarged and displayed, and the farther from the own vehicle 31, the wider the area is displayed.

Since the position information of the own vehicle 31 displayed on the road map 32b and the road on which the own vehicle 31 is traveling are displayed with a sense of perspective, the driver can determine the optimum travel route.

As described above, the car navigation device 10 of this embodiment has the CPU 11, the ROM 12, and the RA.
M13, VRAM14, key input section 15, GPS16,
CD-ROM 18, CD-ROM demodulation circuit 19, DD
A circuit 20, a DISPLAY 21, etc. are provided, and the CPU 11 performs vector conversion based on map information from the CD-ROM 18, current position information from the GPS 16 and vector information (traveling direction and traveling speed) determined from the cumulative value thereof. Since the vector-converted map information is transferred to the VRAM 14 and displayed on the DISPLAY 21 through the DD circuit 20, the information in the range close to the own vehicle 31 is enlarged and displayed, and the magnification of the latest data and the far data is from the own vehicle position. Will be changed according to the distance of
(1) The latest information is instantly easy to understand, (2) the vehicle position on the map is easy to understand, (3) the sense of direction to the direction of travel and the destination is easy to grasp, and there are advantages such as safe and accurate destination. You can build a car navigation system that guides the driver.

<Second Embodiment> FIGS. 4 and 5 are views showing a second embodiment of the map information system according to the present invention, which is an example in which the map information system is applied to a car navigation apparatus.

In the description of this embodiment, the same components as those in FIG. 1 will be assigned the same reference numerals and overlapping explanations will be omitted.

In FIG. 4, a car navigation device 4
0 is CPU 11, ROM 12, RAM 13, VRAM
14, VRAM 41, camera unit 42, image processing unit 43,
Picture-in-picture (PIP) circuit 44, key input unit 15, GPS 16, CD-ROM 18, CD-RO
M demodulation circuit 19, DD circuit 45, DISPLAY 21
And so on.

The camera section (imaging means) 42 includes the lens 5
1 and a CCD (Charge Coupled Device) 52.

The lens 51 is an optical lens made of glass or plastic provided on the front surface of the moving body 31, and the CCD 52 generates an electric signal based on the intensity of the light imaged by the lens 51, The electric signal (analog signal) is output to the image processing unit 43.

The image processing section 43 uses an ADC (Analog to Di
(Gital Converter: A / D converter), a video memory, etc., and converts the electric signal input from the CCD 52 of the camera unit 42 into image data to perform VRAM 41.
Transfer to.

The PIP circuit (image synthesizing means) 44 is a VR
Map information and VRA after vector conversion stored in AM14
The image pickup information and the like stored in M41 are superimposed and combined as an image for one screen, and the combined image is output to the DD circuit 45.

The DD circuit 45 is a circuit for driving the DISPLAY 21 in order to display an image by the DISPLAY 21 based on the display data expanded in the PIP circuit 44. Specifically, the input display signal is supplied to a predetermined pixel. Convert to analog video signal of specified bit with
It is output to PLAY21.

In the above-mentioned structure, the route information input in advance is expressed on the through screen of the camera section by synthesizing the image information shown in FIG. 5A with the vector-converted map information shown in FIG. Can be done (Fig. 5
(See (c)).

Therefore, the same real image as the scene seen by the driver is displayed on the screen, and the turning angle and the turning direction can be seen by superimposing it on the real image, and the confirmation during driving becomes easier.

The vector conversion processing (coordinate conversion based on speed) in the first embodiment is not limited to the above embodiment.

Other vector conversion or coordinate conversion processing will be shown below as third, fourth and fifth embodiments. In the following embodiments, only vector conversion or coordinate conversion processing will be described. However, the system configuration and operation are the same as in the first embodiment, so description thereof will be omitted. That is, only the vector conversion or coordinate conversion processing in the CPU 11 is different.

<Third Embodiment> FIG. 6 is a diagram showing a third embodiment of the map information system according to the present invention.

Next, the operation of this embodiment will be described.

In this embodiment, similar to the car navigation system of each of the above-described embodiments, the current position, traveling direction and traveling speed of the moving body are input from the GPS 16 to the CPU 11, and C
The PU 11 reads map information around a predetermined area, for example, the current position from the CD-ROM 18 via the demodulation circuit 19.

The CPU 11 converts each position of the read map information into a polar coordinate value centering on the current position of the moving body and performs logarithmic calculation processing on the polar coordinate value to reduce the map information. .

That is, the CPU 11 reads out the current position of the mobile unit from the GPS 16 and cuts out from the CD-ROM 18 the image of the map information of the area corresponding to the current position of the mobile unit.

At this time, the CPU 11 causes the DISPLAY
An image of the map information of an area that is wider by a predetermined amount than the map information of the area corresponding to the display area 21 is cut out (read out) from the CD-ROM 18.

Then, as shown in FIG. 6A, the CPU 11 determines the position of the read map information by using the GPS 16
Is converted into polar coordinates centered on the current position (displayed with O in FIG. 6A) input from
A logarithmic calculation process is performed to convert the map information at a position farther from the current position O into a reduced polar coordinate.

In FIG. 6, the radius r before conversion is represented by r1, r2, r3, ... In polar coordinates (r, θ) whose origin is the current position of the moving body indicated by “O”, and after conversion. The radius R of each of r1 ', r2',
It is indicated by r3 ', ....

The above logarithmic calculation is performed, for example, on the CD-ROM 1
When the polar coordinates of the map information read from 8 are represented by (r, θ), the polar coordinates (r, θ) are converted into polar coordinates (R, θ) by logarithmic calculation. For r = r1, r2, r3, ... Shown, when the radius to be converted is r ≦ r1, R = r, and when r> r1, R = 1 + log r / log 3 Reduces polar coordinate values.

Therefore, as shown in FIG. 6B, C
The polar coordinates of the map information read from the D-ROM 18 (r,
When r of θ) is equal to or smaller than r1, the read map information can be reduced in size as it is and the read map information can be reduced as r becomes larger.

In the logarithmic operation in this case, lo
Although gr is divided by log 3, it is not limited to division of log r by log 3, and the reduction ratio can be changed by appropriately changing the value of division of log r. In other words, if you change the denominator by the speed,
It is possible to perform conversion corresponding to the vector (direction and speed).

In this way, the map information whose coordinates have been converted is expanded in the VRAM 14 and is passed through the DD 20 to the DISPL.
Display output to AY21.

Therefore, in the DISPLAY 21, the map information that is further reduced in the radial direction of the circle centering on the self position O is displayed, and the map information around the self position O is greatly detailed. To DISPLA
Map information that is displayed in Y21 and is far from the self position O (map information that cannot be displayed by displaying the same size)
Is also reduced and displayed on the DISPLAY 21.

As described above, in the map information system of this embodiment, it is possible to display the map information reduced in a circular shape centering on the position of the moving body, and the driver can more easily find his / her position. In addition to being able to confirm, it is possible to know the map information of the surrounding area in a wide range.

<Fourth Embodiment> FIG. 7 is a diagram showing a fourth embodiment of the map information system according to the present invention. In this embodiment, each position of the map information is polar coordinates in the third embodiment. While the map information is converted into and reduced, the respective positions of the map information are converted into Cartesian coordinates and reduced.

The map information system of this embodiment converts the position of each point on the map information into rectangular coordinates with the self position O as the origin, and performs logarithmic calculation processing on this rectangular coordinate value to reduce the size. Processing.

That is, the CPU 11 of the present embodiment reads out the current position of the moving body from the GPS 16 and corresponds to the current position of the moving body, as in the above-mentioned respective embodiments.
The map information of a wider area than the display area of the DISPLAY 21 is read from the CD-ROM 18.

Then, as shown in FIG. 7A, the CPU 11 converts the position of the read map information into orthogonal coordinates with the current position of the moving body (indicated by O in FIG. 7A) as the origin. For example, logarithmic calculation processing is performed on the converted orthogonal coordinates, and map information at a position farther from the current position O
Convert to reduced Cartesian coordinates.

This logarithmic calculation process is performed by, for example, CD-RO.
The Cartesian coordinates of the map information read from M18 are (x, y)
In the case of, the Cartesian coordinates (x, y) are converted into Cartesian coordinates (X, Y) by logarithmic calculation.
With respect to x = x1, x2, ... Shown for x in (a), when | x | ≦ 1, X = x, and when | x |> 1, X = 1 + log x / log 3 Then, the Cartesian coordinate value is reduced.

Similarly, with respect to y, when y ≦ y1, Y = y, and when | y |> 1, Y = 1.
+ Log y / log 3 is calculated to reduce the Cartesian coordinate value.

Therefore, when both of the Cartesian coordinates (x, y) | x | and | y | of the map information read from the CD-ROM 18 are 1 or less, the size of the read map information is taken as it is, and | x |, | As y | increases,
The read map information can be reduced by increasing the reduction ratio.

In the logarithmic operation in this case, lo
Although g x and log y are divided by log 3, it is not limited to division by log 3, and by appropriately changing the values for dividing log x and log y, as in the third embodiment,
The reduction ratio can be changed.

In this way, the orthogonally transformed map information is expanded in the VRAM 14 and is passed through the DD 20 to the DISPL.
Display output to AY21.

Therefore, as shown in FIG. 7 (b), the DISPLAY 21 has a wide range of map information centered on the moving body with the self position O as the center.
It is possible to display a lot of map information necessary for the progress of the moving body in the future.

In the third and fourth embodiments, the map information read from the CD-ROM 18 is converted into polar coordinate values or orthogonal coordinate values with the self-position O as the origin, and the polar coordinate values and orthogonal coordinate values are converted. Map information is reduced by performing logarithmic calculation processing on coordinate values.
The map information is not limited to the logarithmic calculation, and the map information may be reduced by performing a square root calculation process or a cubic root calculation process, for example.

For example, in the case of the square root processing in the third embodiment, when r≤r1, R = r and r> r.
When 1, R = r ^1/2 .

When square root processing is performed in the fourth embodiment, when | x | ≦ 1 and | y | ≦ 1, X =
x, Y = y, and when | x |> 1 and | y |> 1,
X = x ^1/2 and Y = y ^1/2 .

<Fifth Embodiment> FIGS. 8 to 12 are views showing a fifth embodiment of the map information system of the present invention. In this embodiment, based on the map information read from the CD-ROM 18, as shown in FIG. 8, E, F, G, H
The area surrounded by is the display area of DISPLAY21,
In order to display the compressed map information in the display area of this DISPLAY 21, a virtual screen VR (A, B in FIG.
A region surrounded by C and D) is assumed. Note that the coordinates of each point in the figure correspond to the display position, and are not limited to this at the time of conversion.

It is assumed that the map information within the circle FC with the radius r shaded in FIG. 8 is not compressed, and the map information outside the circle FC is compressed into an image as seen through a fisheye lens. The area of the uncompressed circle FC can be changed within the range of 1 to 140 in the radius r.

In FIG. 8, when the display area of the DISPLAY 21 is (320, 200) dots in the aspect ratio, the virtual screen VR has the point A as the origin (0, 0).
Areas up to (639, 399) are set.

Then, as will be described later, the CPU 11
The map information is compressed as if it were seen through the fisheye lens with the current position of the moving body as the center point O of the circle FC, that is, the center point O of the fisheye.

That is, as shown in FIG. 9, the coordinates of the fisheye center point O are (α, β), the coordinates of a point P on the DISPLAY (display screen) 21 are (x ₀ , y ₀ ), The coordinates of the point Q corresponding to the point P of the virtual screen VR are (x, y), the upper limit coordinates (γ, δ), (ε, δ) of the display screen 21, and the radius of the uncompressed circle FC are a0. Then, the length (distance) from the center O of the circle FC to the points P and Q is shown below.

| OP | = r ₀ + a ₀ | OQ | = r + a ₀ Here, in order to compress and display each point on the virtual screen VR in the area in the DISPLAY 21, an exponential function for compression calculation is used. It is necessary to set the exponent part. Assuming that the exponent part is b, as shown in FIG. 9, the compression rate in the y direction is higher than that in the x direction, so x = α
Considering the above points as a reference, when the points on (α, δ) are compressed so as to correspond to the points on (α, 0), all the map information of the virtual screen VR is compressed into the display screen of DISPLAY 21. Can be displayed.

That is, log _b δ = (β−δ) −a ₀ , and by modifying the above equation, log ₁₀ b = log ₁₀ δ / {(β−δ) −a ₀ }.

Therefore, the exponent part b of the exponential function can be obtained by the following equation.

B = 10exp [log ₁₀ δ / {(β−δ) −a ₀ }] When the exponent part b is set in this way, the virtual screen V
B to the distance from the circumference of circle FC of radius a0 of point P on R
The power of is the distance from the circumference of the circle FC at point Q.

That is, r ₀ × b = r.

As is clear from the above, the general formula for making each point on the virtual screen VR a point on the DISPLAY 21 is as follows.

R ₀ = {(x ₀ −α) ² + (y ₀ −β) ² } ^1/2 and an angle formed with the x axis of the line segment OP (horizontal axis in FIGS. 8 and 9). If θ is set, θ is calculated by the following equation.

Θ = tan ⁻¹ | (y ₀ −β) | / | (x ₀ −α) | Here, when the coordinate displacement of the point Q from the point P is Δx and Δy, Δx = (r ₀ + a ₀ ) ^b cos θ = [{[(x ₀ −α) ² + (y ₀ −β) ² ] ^1/2 + α ₀ } × exp {10exp [log ₁₀ δ / {(β−δ) −a ₀ }] ] × cos {tan ⁻¹ | (y ₀ −β) | / | (x ₀ −α) |} Δy = (r ₀ + a ₀ ) ^b sin θ = [{[(x ₀ −α) ² + (y ₀ −β) ² ] ^1/2 + α ₀ } × exp {10exp [log ₁₀ δ] / {(β−δ) −a ₀ }]] × sin {tan ⁻¹ | (y ₀ −β) | / | ( x ₀ −α) |}.

Therefore, the Q point (x, y) is the above Δx.
And Δy are used to convert as follows.

(X, y) = (x ₀ + Δx, y ₀ + Δy) Next, the operation of this embodiment will be described.

In this embodiment, similar to the car navigation device of each of the above-mentioned embodiments, the current position, traveling direction and traveling speed of the moving body are input from the GPS 16 to the CPU 11, and C
The PU 11 reads map information of a predetermined area, for example, an area corresponding to the virtual screen VR including the current position from the CD-ROM 18 via the demodulation circuit 19.

The CPU 11 makes the read virtual screen V
R map information is compressed into a fisheye lens,
Display output to PLAY21.

That is, as shown in FIG.
1 first calculates the compression ratio of map information (step Q
1) In the display screen, that is, the coordinates of dots in one quadrant in the DISPLAY 21, the coordinates of the dots in the first quadrant are extracted in the first process (step Q2).

Whether or not the extracted dot is within a range that is not compressed, that is, the circle FC shown in FIG. 8 and FIG.
Check if it is a dot inside (step Q
3) If the dot is within the uncompressed range, the coordinates of the dot are stored as they are in the work memory in the CPU 11 or the memory such as the RAM 13 (step Q4).

At step Q3, when the dot is a dot within the range requiring compression, that is, a dot outside the circle FC, the coordinate value on the virtual screen VR corresponding to the dot is calculated as described above ( In step Q5), the calculated dot coordinate values are stored in the memory (step Q4).

When the above processing is performed for each dot in the first quadrant and the coordinate values of all the dots in the quadrant are stored in the memory, the coordinate values of the virtual screen VR corresponding to each dot in the quadrant on the display screen are calculated. CD-R with sequential map information
It is read from the OM 18 (step Q6).

It is checked whether the dot map information read from the CD-ROM 18 is the information of the national road or the main road (step Q7). If YES, after the dot map information of the virtual screen VR is written in the VRAM 14. , DISPLAY21 of the dot via DD20
Write to the corresponding dot position above (step Q
8).

When the writing to the DISPLAY 21 is completed for all the dots in the first quadrant, step Q
Returning to step 2, the second quadrant is similarly processed.

That is, the coordinates of each dot in the second quadrant on the DISPLAY 21 are extracted (step Q2), and it is checked whether each extracted dot is within the circle FC (step Q3). The coordinates are stored in the memory, and when the circle is outside the circle FC, the coordinates on the virtual screen VR corresponding to the dot are calculated, and the calculated coordinate values are stored in the memory (steps Q4 and Q5).

When the coordinates of all the dots in the second quadrant are stored in the memory, the map information at the coordinate positions is stored in the CD-ROM 1.
8 is read out and only the map information of the national road or the main highway is displayed on the DISPLAY 21 (steps Q6 to Q8).

When the processing of the second quadrant is completed, next, the third
When the processing in the quadrant is performed in the same manner as described above and the processing in the third quadrant is completed, the processing in the fourth quadrant is performed in the same manner as described above.

When the processing is completed up to the fourth quadrant, FIG.
The map information of each dot on the virtual screen VR shown in (a) is as shown in FIG.
It is displayed on the DISPLAY 21 without being compressed, and the map information outside the circle FC is compressed and displayed on the DISPLAY 21.

Therefore, the map information in the predetermined circle FC centering on the current position O is displayed in the DISPLAY 21.
The map information that is displayed without being compressed and covers a wide range outside the circle FC is compressed and displayed as seen through a fisheye lens.

As a result, detailed map information is displayed at a position near the current position O, and is displayed over a wide area compressed at a position far from the current position O so that the driver can change his or her position. It is possible to confirm the map more easily and to know the map information of the surrounding area in a wide range.

In the fifth embodiment, the CPU
11, the coordinate values on the DISPLAY 21 are calculated and converted into the coordinate values on the virtual screen VR.
Therefore, if the arithmetic processing is performed one by one, the arithmetic processing requires a long time, for example, ten or more minutes in the case of the 32-bit 20 MHz CPU 11.

Therefore, each point on the virtual screen VR is DI
It is also possible to store the coordinate conversion value in the case of coordinate conversion on the SPLAY 21 as a data table in the ROM 12 and perform the coordinate conversion by referring to this data table.

In this case, if the coordinate conversion values of all points on the virtual screen VR are stored in the ROM 12, the required capacity of the ROM 12 becomes large. Therefore, the virtual screen VR is divided into four quadrants and the coordinate conversion of the first quadrant is performed. If only the values are stored in the ROM 12 in the data table format, the capacity of the ROM 12 can be reduced.

That is, as shown in FIG. 12, the ROM 12 stores the coordinate conversion values of the line segment | OP | x and the line segment | OP | y for each of the x and y components shown in FIG.
It may be stored in a dimensional array.

Thus, when the data table is three-dimensionally arranged only in the first quadrant and stored in the ROM 12, R
In the case of the OM 12 shown in FIGS. 8, 9 and 12, 47.5 kilobytes is sufficient.

That is, the capacity of the ROM 12 is 161
[Dot] × 151 [dot] × 2 [component] × 1 [byte] = 47.5 kilobytes.

At this time, when the CPU 11 converts the coordinates of the dots in each quadrant of the DISPLAY 21 into the coordinates on the virtual screen VR in step Q5 of FIG. 10, it does not perform the calculation process one by one but based on the data table in the ROM 12. Thus, the coordinate conversion can be performed, and the coordinate conversion processing can be performed at high speed.

Although the invention made by the present inventor has been specifically described based on the preferred embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. It goes without saying that it can be changed.

For example, in each of the above embodiments, DIS
Although the display color of the PLAY 21 is not described, the background color may be changed according to the reduction ratio.

In each of the above embodiments, the GPS (Global
Although the position of the moving body is calculated by the Positioning System), any device that can calculate the position of the moving body may be used, for example, an inertial navigation system may be used.

Furthermore, in each of the above embodiments, the map information system is applied to the car navigation system, but any type of map conversion, logarithmic arithmetic processing, or other reduction processing corresponding to the map information can be used. It goes without saying that a map information system may be used.

[0144]

According to the map information system of the first aspect of the present invention, at least the map information representing the road is read out from the map information storage means based on the current position of the moving body detected by the current position detection means. Generated map information by reducing the map information according to the distance from the current position,
indicate.

Therefore, the map information near the current position of the moving body is displayed in a large and detailed manner, and is reduced and displayed as the distance from the moving body is increased.

As a result, it becomes easy to confirm the map information while driving, and the driver can safely and accurately perform the driving operation.

In this case, as described in claim 2, self-position information generating means for synthesizing the current position of the moving body detected by the current position detecting means on the map information converted by the converting means is further provided. With the provision, the map information in which the current position is combined can be displayed, and the current position on the map information can be easily confirmed.

As a result, the map information during driving can be confirmed more easily, and the driver can perform safer and more accurate driving operation.

According to the map information system of the third aspect of the present invention, the map information read from the map information storage means is converted into the output of the vector detection means for detecting the moving direction and the moving speed of the moving body. Based on the vector conversion, the vector-converted map information is displayed.

As a result, it is possible to easily confirm the map information while driving, and the driver can perform safe and accurate driving operation.

In this case, when the conversion means changes the conversion magnification according to the distance from the moving body as described in claim 4, vector conversion of the conversion magnification corresponding to the distance of the moving body is performed. Therefore, the map information during driving can be confirmed more easily.

Further, as described in claim 5, the converting means enlarges and displays the map information in the range close to the moving body so that a wider area can be displayed as the distance from the moving body increases. When converted, the map information closer to the moving body can be more easily confirmed, and the map information far from the moving body can also be confirmed in a wide range.

Further, when the signal direction detecting means detects the traveling direction by GPS as described in claim 6, the traveling direction can be accurately detected by a simple device.

Further, in the case of claim 1 or claim 2, as described in claim 7, the conversion means stores the map information from the map information storage means in accordance with the distance from the current position of the moving body. By expanding the address interval for reading out, and performing the reduction processing to convert the reduced map information, the map information can be reduced easily.
The map information system can be made inexpensive.

Further, as described in claim 8, the converting means calculates a logarithm with respect to a distance corresponding to each position on the map information read from the map information storing means from the current position of the moving body. When the reduction processing is performed on the map information read out from the map information storage means by performing the processing, the map information near the moving body can be displayed in detail by a simple arithmetic processing, and a wider area can be displayed. Map information can be displayed.

Further, as described in claim 9, the conversion means performs a square root calculation process for a distance corresponding to each position on the map information read from the map information means from the current position of the moving body. By performing the reduction process on the map information read from the map information storage means by performing the map information, the map information near the moving body can be displayed in detail by a simple arithmetic process, and the map information in a wider range can be obtained. Can be displayed.

In the case of claim 8 or claim 9, the converting means corresponds to each position on the map information read by the map information storing means from the current position of the moving body as described in claim 10. By converting the distance to a polar coordinate value and performing the calculation process on the polar coordinate value, it is possible to display the circularly reduced map information centered on the position of the moving body, and the driver can The position can be more easily confirmed, and the map information of the surrounding area can be known in a wide range.

Further, as described in claim 11, the converting means converts the distance from the current position of the moving body corresponding to each position on the map information read by the map information storing means into an orthogonal characteristic. However, when the arithmetic processing is performed on the Cartesian coordinate values, the map information on the front side of the moving body can be displayed in a wide range, and the map information necessary for the future progress of the moving body can be known abundantly. it can.

Further, in the case of claim 1 or claim 2, as described in claim 12, the converting means sets the map information from the current position of the moving body with the current position of the moving body as a center. When the map information read out from the map information storage means is converted into the reduced map information by performing a reduction process for changing the compression rate on the upper position as seen through the fisheye lens, the position of the moving body is centered. As a result, it is possible to display the reduced map information in a state where the surroundings are photographed with the fisheye lens, so that the driver can more easily confirm his / her position and to know the surrounding map information in a wide range. .

In the twelfth aspect, as described in the thirteenth aspect, the conversion means compresses the map information stored in the map information storage means by changing the compression rate as seen through the fisheye lens. When the converted value at the time of storing is stored in the converted value storage means and the map information read out from the map information storage means is converted into the reduced map information based on this converted value, the map information read out from the map information storage means is converted. The reduced map information can be converted at high speed, and the processing speed can be improved.

Further, in this case, as described in claim 14, only the conversion value of the first quadrant of the predetermined coordinate space is stored in the conversion value storage means, and the conversion value is the conversion of the first quadrant. If all the map information read from the map information storage means is converted into the reduced map information based on the value, the storage capacity of the converted value storage means can be reduced and the map information can be converted into the reduced map information at high speed. be able to.

In each of the above cases, the map information system sets the background color of the converted map information on the basis of the reduction ratio of the map information converted by the converting means, as described in claim 15, for example. If the image processing means for changing is further provided, the reduced state can be easily confirmed, and the map information during driving can be more easily confirmed.

In addition, the map information system is, for example,
The image pickup means for picking up an image of the situation in the traveling direction, and the image combining means for combining the image picked up by the image pickup means with the map information converted by the conversion means. If so, the map information and the image of the progress situation can be viewed at the same time, the confirmation of the map information can be more easily confirmed, and the driver can further safely and accurately perform the driving operation.

Further, when the present position detecting means detects the present position of the moving body by GPS, for example, as described in claim 17, the present position can be accurately detected by a simple device. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a car navigation device to which a first embodiment of a map information system according to the present invention is applied.

FIG. 2 is a diagram showing an example of conversion of map information in the map information system of the embodiment.

FIG. 3 is a flowchart showing a program for map information conversion processing of the map information system of the embodiment.

FIG. 4 is a configuration diagram of a car navigation device to which a second embodiment of the map information system according to the present invention is applied.

FIG. 5 is a diagram showing a display example of map information of the map information system of the embodiment.

FIG. 6 compares a schematic diagram (a) of map information before conversion processing and a schematic diagram (b) of map information after conversion processing by the car navigation device of the third embodiment of the map information system according to the present invention. FIG.

FIG. 7 compares a schematic diagram (a) of map information before conversion processing and a schematic diagram (b) of map information after conversion processing by the car navigation device of the fourth embodiment of the map information system according to the present invention. FIG.

FIG. 8 is a virtual screen VR and DISPLA for explaining fisheye lens-shaped map information conversion processing by the car navigation device of the fifth embodiment of the map information system according to the present invention.
The figure which shows a Y screen.

9 is an explanatory diagram of fisheye lens-shaped map information conversion processing by the car navigation device of FIG. 8;

10 is a flowchart showing a program for map information conversion processing by the car navigation device of FIG.

11 is a diagram showing a comparison between map information (a) before conversion processing and map information (b) after conversion by the car navigation device of FIG.

FIG. 12 is a diagram showing an example of a coordinate conversion table stored in a ROM of a car navigation device to which a fifth embodiment of the map information system according to the present invention is applied.

[Explanation of symbols]

 10, 40 Car navigation device 11 CPU 12 ROM 13 RAM 14, 41 VRAM 15 Key input unit 16 GPS 18 CD-ROM 19 Demodulation circuit 20, 45 DD circuit 21 DISPLAY 31 Own vehicle (moving body) 32a, 32b Road information 42 Camera Part 43 image processing part 44 picture-in-picture (PIP) circuit VR virtual screen FC circle

[Procedure amendment]

[Submission date] May 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0112

[Correction method] Change

[Correction content]

B = 10exp [log ₁₀ δ / {(β-δ) -a ₀ }] When the exponent part b is set in this way, the virtual screen V
B to the distance from the circumference of the circle FC of radius a0 of point P on R
The value obtained by raising the power of is the distance between the points Q and P.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0113

[Correction method] Change

[Correction content]

That is, r ₀ ^b = r.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0115

[Correction method] Change

[Correction content]

R ₀ = {(x ₀ −α) ² + (y ₀ −β) ² } ^1/2 −a ₀ And the x axis of the line segment OP (horizontal axis in FIGS. 8 and 9). When the angle formed is θ, θ is calculated by the following equation.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0116

[Correction method] Change

[Correction content]

Θ = tan ⁻¹ | (y ₀ −β) | / | (x ₀ −α) | Here, when the coordinate displacement of the point Q from the point P is Δx and Δy, Δx = r ₀ ^b cos θ = _{^{"{[(x 0 -α) 2 + (}} v 0 -β) 2 ] _{^{1/2} × exp {10exp [log}} 10 δ / {(β-δ) -a 0}]] × cos {tan - ¹ | (y ₀ −β) | / | (x ₀ −α) |} Δy = r ₀ ^b sin θ = “{[(x ₀ −α) ² + (v ₀ −β) ² ] ^1/2 } × exp { ₁₀ exp [log ₁₀ δ] / {(β−δ) −a ₀ }]] × sin {tan ⁻¹ | (y ₀ −β) | / | (x ₀ −α) |}.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

[Figure 9]

Front page continuation (72) Inventor Kazuyuki Kurosawa 2-229 Sakuragaoka, Higashiyamato-shi, Tokyo Casio Computer Co., Ltd. Tokyo office

Claims (17)

[Claims] 1. A map information storage means for storing at least map information representing a road, a current position detecting means for detecting a current position of a moving body, and a current position of the moving body detected by the current position detecting means. A conversion means for converting the map information read out from the map information storage means into map information reduced according to the distance from the current position, and a display control means for controlling the display of the map information converted by the conversion means. And a map information system characterized by. 2. The map information system further comprises self-position information generating means for synthesizing the current position of the moving body detected by the current position detecting means on the map information converted by the converting means. The map information system according to claim 1, which is characterized in that. 3. A map information storage means for storing at least map information representing a road, a vector detection means for detecting a traveling direction and a traveling speed of a moving body, and map information read out from the map information storage means for storing the vector as the vector. A map information system comprising: a conversion unit for converting a vector based on an output of the detection unit; and a display control unit for controlling display of the map information vector-converted by the conversion unit. 4. The map information system according to claim 3, wherein the conversion means changes the conversion magnification according to the distance from the moving body. 5. The converting means enlarges and displays the map information in a range close to the moving body, and converts the map information so that a wide area can be displayed as the distance from the moving body increases. Map information system described in 3. 6. The map information system according to claim 3, wherein said traveling direction detecting means detects a traveling direction by GPS (Global Positioning System). 7. The conversion means reads out from the map information storage means by expanding an address interval for reading out the map information from the map information storage means according to a distance from the current position of the mobile body. The map information system according to claim 1 or 2, wherein the reduction processing is performed on map information. 8. The map information is obtained by performing a logarithmic calculation process on a distance corresponding to each position on the map information read out from the map information storage means from the current position of the moving body. The map information system according to claim 1 or 2, wherein the reduction processing is performed on the map information read from the storage means. 9. The map information storage means by performing a square root calculation process for a distance corresponding to each position on the map information read from the map information means from the current position of the moving body by the converting means. 3. The map information system according to claim 1, wherein the reduction processing is performed on the map information read from the map information system. 10. The conversion means converts a distance corresponding to each position on the map information read from the map information storage means from the current position of the moving body into a polar coordinate value, and the calculation is performed on the polar coordinate value. The map information system according to claim 8 or 9, wherein processing is performed. 11. The conversion means converts a distance corresponding to each position on the map information read by the map information storage means from the current position of the moving body into an orthogonal standard value, and with respect to the orthogonal coordinate value. The map information system according to claim 8 or 9, wherein the arithmetic processing is performed. 12. The conversion means performs reduction processing centering on the current position of the moving body and changing the compression rate from the current position of the moving body to a position on the map information as seen through a fisheye lens. The map information system according to claim 1 or 2, wherein the map information read out from the map information storage means is converted into the reduced map information by performing the application. 13. The conversion means includes conversion value storage means for storing conversion values when the map information stored in the map information storage means is compressed by changing the compression rate as viewed through the fisheye lens. 13. The map information system according to claim 12, further comprising: converting the map information read from the map information storage means into the reduced map information based on the conversion value of the conversion value storage means. 14. The conversion means, wherein the conversion value storage means stores only a conversion value in a first quadrant of a predetermined coordinate space, and based on the conversion value in the first quadrant stored in the conversion value storage means. 14. The map information system according to claim 13, wherein all the map information read from the map information storage means is converted into the reduced map information. 15. The map information system, based on a reduction rate of the map information converted by the conversion means,
The map information system according to any one of claims 1 to 14, further comprising image processing means for changing a background color of the converted map information. 16. The map information system comprises: an image pickup means for picking up a situation in a traveling direction; and an image synthesizing means for synthesizing the image picked up by the image pickup means with the map information converted by the conversion means. The map information system according to any one of claims 1 to 15, further comprising: 17. The present position detecting means detects the present position of the moving body by GPS, according to any one of claims 1, 2 and 7 to 16. Map information system.