JPH06331371A - Road information display device - Google Patents

Abstract

(57) [Summary] [Purpose] Separate the necessary and unnecessary map information parts. [Structure] The positioning system 104 detects the current position from the received signal from the GPS receiver 102. And the recording medium
The map information is read from 103 and drawing processing is performed. At this time, the current position is displayed on the map. Brightness control means 106
The image data from the positioning system 104 emphasizes the brightness of roads, character symbols, and the background in the specific area centering on the route setting route, and does not emphasize the brightness of portions other than the specific area. The display means 105 displays the image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road information display device for navigation, for example.

[0002]

2. Description of the Related Art In a conventional road information display device, the luminance of a map information portion required for driving and the luminance of an unnecessary map information portion are not divided and are displayed with a uniform brightness. For this reason, the driver was driving to find the necessary map information portion with his / her eyes.

[0003]

In the conventional road information display device, even the part of the map information that is unnecessary for the driver is displayed in a uniform brightness, so that the driver needs the map information while driving the car. Because it was necessary to identify the parts, it was not possible to concentrate on driving, which was a safety issue.

An object of the present invention is to provide a map information display device in which a necessary map information portion can be clearly identified.

[0005]

[Means for Solving the Problems]

(Structure example 1) A recording medium that holds map information, an information processing unit that reads out the map information from the recording medium and performs an arithmetic process, and a current position detection unit that detects the current position of the vehicle.
Display means for displaying the current location together with the map information,
In a road information display device including an input unit for selecting an operation of the information processing unit, a road in a specific region, a character symbol, and a background are emphasized with a route set as a center,
Brightness control means that does not emphasize roads, character symbols, and backgrounds other than the specific area is provided between the information processing means and the display means.

(Structural Example 2) A recording medium for holding map information, an information processing means for reading out the map information from the recording medium and performing an arithmetic process, a current position detecting means for detecting the current position of the vehicle, and its current position. In a road information display device comprising a display means for displaying a position together with the map information and an input means for selecting an operation of the information processing means, a specific area at a predetermined angle with respect to a traveling direction is centered around the own vehicle position. Brightness control means for emphasizing roads, character symbols and backgrounds in the specific area and not emphasizing roads, character symbols and backgrounds other than the specific area is provided between the information processing means and the display means.

[0007]

[Function] Since the road, character symbols and background of the necessary map information part are emphasized and the road, character symbols and background of the unnecessary map information part are not emphasized, the necessary map information part and the unnecessary map information part are It can be clearly divided. Therefore, the driver does not have to search for the necessary map information and can concentrate on driving.

[0008]

1 is a block diagram showing the configuration of a road information display device for navigation according to the present invention. here,
A GPS (Global Positioning System) receiver 102 of the general radio law, a storage medium 10 as a storage means of road map information
3, a positioning system 101 including a CPU (central processing unit) for performing storage, data calculation and drawing processing, a ROM (read-only storage element) and a RAM (readable and writable storage element), a display means 105, an input means 101 , Brightness control means
106 and a switch 107.

The correlation between the above listed means will be described below. The storage medium 103 is composed of, for example, a CD-ROM disc, and stores various road map data such as a wide area such as the whole of Japan or a limited area such as the Kanto region. The GPS receiver 102 receives the radio wave emitted by the artificial satellite and inputs the received signal to the positioning system 104. The positioning system 104 receives the received signal, calculates it, and detects the vehicle position. By the manual selection operation of the input means 101, the positioning system 104 reads the road map data from the storage medium 103 and performs data calculation and drawing processing. At this time, the vehicle position is also drawn. Positioning system 104
The output of the direct display means 10 can be selected by selecting the switch 107.
5 or send the image data to the brightness control means 106. The display unit 105 is an LCD (liquid crystal display device) or a CRT.
(Cathode ray tube). Screen data is displayed directly 105
In addition to the above, the map information is displayed on the display means 105 with uniform brightness as in the conventional case. Positioning system 10
Reference numeral 4 is composed of a CPU, a ROM and a RAM for performing storage, data calculation and drawing processing as described above.

The operation of the brightness control means 106 will be described with reference to the flowchart of FIG. The positioning system 104 outputs road data, character / symbol data, and background data to the brightness control means 106. The brightness control means 106 first determines a setting area in which the brightness is emphasized (201).
How to determine this setting area will be described later. Next, the road within the set area is obtained from the input road data (202). Color palette control is performed on the obtained road information (203). In this color palette control, 16 color palette numbers (each R, G, B consisting of 2 bits are set as one set, and 0, 1, 2, ..., 9, A, B ,.
Corresponding to one number), the higher number is selected and the brightness is emphasized. The information on the road under the color palette control is displayed on the display means 105 (204).
Next, the character / symbol in the setting area is obtained from the input character / symbol data (205). The color palette control described above is performed on the obtained character / symbol information (206). The information of the characters and symbols under the color palette control is displayed on the display means 105 (207). Next, the background in the set area is obtained from the input background data (208). The color palette control described above is performed for the obtained background information (20
9). The background information controlled by the color palette is displayed on the display means 105 (210).

Next, roads other than the set area are obtained from the input road data (211). Color palette control is performed on the obtained road information (212). In this case, the color palette control selects the lower number from the 16 color palette numbers and does not emphasize the brightness. Information on roads under color palette control is displayed on the display means.
It is projected on 105 (213). Next, the character / symbol other than the setting area is obtained from the input character / symbol data (214
). Step 212 is performed for the obtained character / symbol information.
Perform the same color palette control as in (215). The information of the characters and symbols under the color palette control is displayed on the display means 105 (216). Next, the background other than the set area is obtained from the input background data (217). The same color palette control as in step 212 is performed on the obtained background information (218). The background information controlled by the color palette is displayed on the display means 105 (219). With the above, the operation of the brightness control means 106 is completed.

As described above, the roads, character symbols, and backgrounds within the set area are displayed on the display unit 105 without emphasizing the brightness, and the roads, character symbols, and backgrounds outside the set area are not emphasized. ing. Therefore, the driver can easily discriminate the required road, character symbol, and background.

FIG. 3 shows the display means 105 by emphasizing the brightness of the roads, character symbols and the background in the specific area centering on the route set and not emphasizing the brightness of the roads, character symbols and the background other than the specific area. Here is an example of what is shown in.

A calculation method for determining a specific area centered on the route set as above will be described with reference to FIG. First, when the straight line between the first point (starting point) (x ₁ , y ₁ ) and the second point (x ₂ , y ₂ ) is obtained, it becomes 401 in (Equation 1).

[0015]

[Equation 1] Note that a and b are the coordinates (x ₁ , y ₁ ) of the _first point and the second point.
The coordinates (x ₂ , y ₂ ) of the point of can be obtained. Then the first
When the perpendicular to the straight line 401 is obtained at the point (x ₁ , y ₁ ) of, the result is 402 in (Equation 2).

[0016]

[Equation 2] The value of C can be obtained by substituting the coordinates of the first point into (Equation 2). Next, if two straight lines parallel to the straight line 401 are set, 403 in (Equation 3) and 404 in (Equation 4) are obtained.

[0017]

[Equation 3]

[Equation 4] Then, the first intersection point i ₁ of the straight lines 402 and 403 is obtained from (Equation 2) and (Equation 3). First intersection j _{1 of} lines 402 and 404
From (Equation 2) and (Equation 4).

Next, when the second point (x ₂ , y ₂ ) and the third point (x ₃ , y ₃ ) are connected, a straight line 405 is obtained. The equation of this straight line is the same as (Equation 1). However, a and b
Is obtained from the coordinates (x ₂ , y ₂ ) of the _second point and the coordinates (x ₃ , y ₃ ) of the _third point. Next, two straight lines 406 and 407 that are parallel to the straight line 405 are set. At this time, straight line 10
The equation of 6 is the same as (Equation 3). However, d remains a fixed value. The formula of the straight line 407 is the same as that of (Equation 4). However, d remains a fixed value. Straight line 403
Then, a second intersection point i2 at which the line 406 and the straight line 406 intersect is obtained. Straight line 404
The second intersection point j _{2 where} the line 407 and the line 407 intersect is obtained.

Next, when the third point (x ₃ , y ₃ ) and the fourth point (destination) (x ₄ , y ₄ ) are connected, a straight line 408
Becomes The equation of this straight line is the same as (Equation 1). However, a and b are the coordinates of the third point (x ₃ , y ₃ ) and the fourth point.
It can be obtained from the coordinates (x ₄ , y ₄ ) of the point. Then straight line 408
Set two straight lines 409 and 410 that are parallel to. At this time, the equation of the straight line 409 is the same as that of (Equation 3). However,
d remains a fixed value. And the formula of line 410 is
This is the same as (Equation 4). However, d remains a fixed value. A third intersection point i _{3 where} the straight line 406 and the straight line 409 intersect is obtained. A third intersection j _{3 where} the straight line 407 and the straight line 410 intersect is obtained.

Next, at the fourth point (x ₄ , y ₄ ), a perpendicular line to the straight line 408 is obtained, which is a straight line 411.
The formula of the straight line 411 is the same as that of (Equation 2). Incidentally, (Equation 2)
By substituting the coordinates of the fourth point into, the value of C can be obtained.
A fourth intersection point i _{4 where} the straight line 409 and the straight line 411 intersect is obtained.
A fourth intersection j _{4 where} the straight line 410 and the straight line 411 intersect is obtained.
The first intersection point i _{1 to} the fourth intersection point i ₄ obtained from the above
An area surrounded by a line connecting the first intersection point j _{1 to} the fourth intersection point j ₄ is a setting area for emphasizing the brightness of the road, the character symbol, and the background.

Unlike FIG. 3, FIG. 5 shows a general case where route setting is not performed, and here, the own vehicle position and the destination are correlated to secure an appropriate angle region (2θ). Then, the brightness of the roads, character symbols, and the background in the angle area is emphasized, and the brightness of the roads, character symbols, and the background other than the angle area is not emphasized. In FIG. 5, θ = 45 degrees is set. A calculation method for determining the specific area shown in FIG. 5 will be described with reference to FIG. First, the first point (current location) (x ₀ ,
A straight line 601 determined by y ₀ ) and the second point (destination) (x ₁ , y ₁ ) is obtained by (Equation 5).

[0022]

[Equation 5] Note that (x ₀ , y ₀ ) is the coordinate of the first point, and (x ₁ ,
y ₁ ) is the coordinates of the second point. When (Equation 5) is expressed by a general formula, it becomes (Equation 6).

[0023]

[Equation 6] Then, the formula of the straight line 602 that rotates the straight line 601 about the angle θ and connects the first point and the third point is expressed by (Equation 7).

[0024]

[Equation 7] Further, the equation of the straight line 603 that rotates the angle (−θ) around the straight line 601 and connects the first point and the fourth point is expressed by (Equation 8).

[0025]

[Equation 8] Substituting the coordinates of the current location into (Equation 7) and (Equation 8),
d and e are easily obtained. Incidentally, θ may be freely changed within the range of 90 °.

As described above, the area surrounded by the two straight lines 602 and 603 sandwiching the destination expressed by the equations (7) and (8) is the set area for emphasizing the brightness of the road, the character symbol and the background. Become.

[0027]

As described above, the brightness control means emphasizes the brightness of roads, character symbols and the background of the necessary map information portion and displays them on the display means. Then, unnecessary roads of the map information portion, the letters and symbols, and the brightness of the background are not emphasized, and they are displayed on the display means. This allows the driver to concentrate on driving without the burden of finding the necessary map information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a road information display device for navigation according to the present invention.

FIG. 2 is a flow chart showing the operation of the brightness control means of the road traffic information display device of the present invention.

FIG. 3 shows an image displayed on a display unit when a specific area is determined around a route that has been set as a route.

FIG. 4 is a diagram showing a calculation method for determining a specific area centered on a route determined as a route.

FIG. 5 shows an image displayed on a display unit when a setting area is determined at a constant angle with a straight line connecting a vehicle position and a destination as a center.

FIG. 6 is a diagram showing a calculation method for determining a setting area with a straight line connecting a self-purchase position and a destination as the center.

[Explanation of symbols]

101 ... Input means, 102 ... GPS receiver, 103 ... Recording medium, 104 ... Positioning system, 105 ... Display means, 106 ... Luminance control means, 107 ... Switch.

Claims (2)

[Claims] 1. A recording medium for holding map information, an information processing unit for reading out the map information from the recording medium and performing an arithmetic process, a current position detecting unit for detecting the current position of the vehicle, and the current position for the map information. In a road information display device comprising display means for displaying together with the input means for selecting the operation of the information processing means, a road, a character symbol and a background in a specific region are emphasized with a route set as a center, A road information display device, characterized in that brightness control means for not emphasizing roads, character symbols and backgrounds other than a specific area is provided between the information processing means and the display means. 2. A recording medium for holding map information, an information processing means for reading out the map information from the recording medium and performing an arithmetic process, a current location detecting means for detecting the current location of the vehicle, and the current location for the map information. In a road information display device comprising display means for displaying together with an input means for selecting the operation of the information processing means, a specific area is formed at a predetermined angle with respect to the traveling direction around the own vehicle position, and within the specific area Road information display, characterized in that brightness control means for emphasizing the roads, character symbols, and background of the above, and not emphasizing roads, character symbols, and backgrounds other than a specific area is provided between the information processing means and the display means. apparatus.