JPH0816102A - On-vehicle map display device - Google Patents

Abstract

PURPOSE:To improve the display speed of maps of the on-vehicle map display device to be used for a navigation system and to maintain the outward appearance of a map display screen even if the display speed of the maps is improved. CONSTITUTION:This on-vehicle map display device having map data stored in a storage means 101 and a map retrieving means 102 for retrieving the map data on the periphery of a desired point of place is provided with a data processing means 100 for processing the retrieved map data with a specified algorithm in the case a request for displaying the maps at a high speed arises. The map data is simplified by a plane data omitting means 103 and means 105, 106, 107 for making colors, line widths and line kinds common at the time of displaying the line data. The processed map data is plotted in an image memory, etc., and is displayed on a map display means 104.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention displays the position and direction of vehicles, ships, aircraft, etc., and geographical information around them.
The present invention relates to a vehicle-mounted map display device used in a navigation system that realizes safe cruising.

[0002]

2. Description of the Related Art A conventional vehicle-mounted map display device (hereinafter, simply referred to as a map display device) comprises a data recording device such as a semiconductor memory or a CD-ROM as shown in FIG. Map data storage means 1 for storing the generated map data, and map data search means 2 for searching the surrounding map data from the longitude and latitude of a desired point.
And map display means 3 for drawing the retrieved map data in an image memory or the like and displaying it on a liquid crystal, a CRT display or the like.

The map data includes line data for displaying roads, administrative circles, railways, rivers, etc., surface data for displaying oceans, lakes, parks, green spaces, facilities, etc., and place names, facility names, etc. It consists of character data for In addition, regarding roads, high-grade roads (highways, national roads, etc.) are displayed with thicker lines than other roads, and in order to make it easier to distinguish administrative circles and railways from roads, It is common to change the pattern to a dotted line and display it.

The map data is divided into a certain unit of division (generally, a division divided by a certain width of longitude and latitude) for easy management, and it is desired to display a map of an area including the boundary of the division. Draws and displays the map data on both sides of the boundary. Therefore, when crossing the boundary of a section by scrolling or the like, the map data of a new section must be read from the map data storage means 1, and it usually takes a little time to display as compared with the scroll display in the section. Is.

As described above, the internal structure of map data is composed of line data, surface data, and character data, but the order of drawing these data is generally surface data that may be underlaid with other data. In many cases, the line data is drawn first, and the character data that cannot be read even if a part is missing is drawn last. Also, in the same line data, considering the appearance when displayed, for example, if it is data related to roads, low roads such as ordinary roads should be drawn ahead of the drawing procedure, that is, drawn first. ,
High-grade roads such as highways and national roads are arranged in the map data storage means 1 in the back and arranged in order so that they can be drawn in the order in which they are arranged. It is common to prevent

Here, a general example of the storage format of the line data, which is one of the map data, in the map data storage means 1 is shown in FIG. As shown in this figure, a plurality of line data such as line data 1, line data 2, ..., Line data n are stored in the line data storage area of the map data storage means 1. Line data number information 5 is generated and stored to represent the total number of line data. Looking at, for example, line data 1 in order to see the configuration of information about individual line data in detail, line data 1 is line color information 6 which is data relating to the line color of the line data 1.
, Line width information 7 that is data related to the line width, line type information 8 that is data related to the line type, and coordinate number information 9 for the line that indicates the number of coordinates required to display the line.
And coordinate information 10 (coordinates 1, ..., Coordinates m) which is the coordinate data necessary to actually display the line on the screen. The same applies to line data 2, line data 3 ...

FIG. 10 shows an example of an algorithm for drawing / displaying line data with reference to the data shown in FIG. The line drawing operation in the conventional map display device will be described below with reference to FIGS. 9 and 10. When this drawing operation is started, first a processing step (hereinafter simply referred to as step) 1
1, the map search means 2 is the map data storage means 1
The number information 5 of the line data is acquired from the line data, and the following processing executed in one line data unit (each of the line data 1, line data 2, ..., Line data n described above) can be repeated many times. Recognize what to do. Next, in step 12, the address for referring to the data is set to the line data 1 which is the top data. Further, in step 13, the line color information 6 is acquired from the map data storage means 1 and the color of the line to be drawn is set in the drawing processor, drawing library or the like, and in step 14, the line width information 7 is acquired from the map data storage means 1. The width of the line to be drawn is set in the drawing processor, the drawing library or the like, and in step 15, the line type information 8 is acquired from the map data storage means 1 and the type of the line to be drawn is set in the drawing processor, the drawing library or the like. Next, in step 16, the number of coordinates (also referred to as the number of interpolation points) of one line data 9
From the map data storage means 1 and recognizes how many coordinates should be acquired in the next processing step.

At step 17, the coordinate information 10 of the line data is obtained.
In the subsequent step 18, it is checked whether or not all coordinate information corresponding to the number of coordinates recognized in the process of the previous step 16 is obtained, and if all coordinate information is not obtained, the process returns to step 17 The acquisition of the coordinate information 10 is repeated until the coordinate information (that is, the coordinates 1 to m) is obtained, and when all the coordinate information 10 is acquired, the process proceeds to the next step. In step 19, line data is drawn by a drawing processor, a drawing library, or the like based on the line color, line width, line type, and coordinate sequence forming the line acquired up to the previous step. In step 20, it is checked whether or not all the line data acquired in step 11 has been drawn. If all line data has not been drawn, the address referred to in step 21 is moved to the next line data, By returning to step 13, the drawing of the line data is repeated until all the line data (that is, the line data 1 to the line data n) is drawn, and if all the line data is drawn, the drawing of this section is completed. I judge that I did. When the above processing operation is executed for the surface data and the character data, the display of the map data of the section is completed.

FIG. 11 is a diagram showing an example of a display map when a normal map display operation is performed by the conventional map display device. As shown in this figure, a normal map display screen 25 has a pond 26 along with a road network 24, a river 27 flowing from it, another river 28 joining the river 27, and a field 29 such as a forest or a green space.
Are displayed in different colors or shades, and characters such as place name (Chuo-ku, Nishimachi) and facility name (Nishiyama CC) are displayed. Then, by displaying the vehicle 31 with a triangular arrow, the position and the traveling direction of the vehicle 31 on the road 32 on which the vehicle 31 is traveling are represented. It should be noted that the character data usually has only one point for displaying a character, not a coordinate string like line data,
In addition, the size of characters and the direction in which character strings are arranged may be added as attributes. By such an operation, the conventional map display device displays the map, and a good display map display can be obtained by the normal map display operation.

[0010]

However, in such a conventional vehicle-mounted map display device, there is a large amount of data when a map of an area having a high information density such as an urban area is scrolled. Since it takes a long time to draw, the display is slow, and the scrolling of the screen does not follow the expectations of the driver of the vehicle, often resulting in an inconvenient device. This means that the driver of the vehicle is restricted by the operation of the map display device for a long time, which in turn has a great influence on the safety of road traffic.

As a method for solving such a situation, paying attention to the fact that map data is stored in a fixed section unit (fixed longitude width / latitude width), a high-speed map display request such as scrolling is required. If it occurs, it should be as shown in Figure 1.
Where the map display screen 25 as shown in FIG. 1 should be displayed, in order to increase the display speed, only a part of the map data is displayed as shown in FIG. 12, and when the scroll is stopped, the map display of the entire screen is displayed. There was a way to do. That is, as shown in FIG. 12, among the map data necessary for displaying the map display screen 30 roughly divided into four sections, during the scroll operation, the map data for the sections 33 and 34 is This is a method of displaying a blank image without transferring it to the map display means 3. Then, when the scrolling is stopped, the remaining data of the map to be displayed on the map display screen 30 at that time is transferred to the map display means 3 to complete the map as shown in FIG. .

However, according to this method, the map display screen 30
A blank map appears in some of the sections 33 and 34 of the road. For example, in the example of FIG. 12, the road 32 on which the vehicle 31 is about to travel is only partially displayed in the road network 24, and the map display is very unsightly. In addition to the above, there is a possibility that the original purpose of the map display device may be hindered, such as displaying the vicinity of the vehicle 31 and the road 32 which is planned to be driven in an easy-to-understand manner for the driver to ensure road traffic safety. .

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a vehicle-mounted device which responds to a high speed map display request without impairing the appearance of the map and smoothly realizes a scroll display of the map. It is to provide a map display device.

[0014]

In order to achieve the above object, the present invention provides a general drawing processor or drawing library in which drawing of line data of only a frame is faster than drawing of surface data, or drawing data. Paying attention to the fact that drawing is faster when there are less changes in attributes such as display color and line width for each, and when a high-speed map display request occurs, only the frame is drawn without painting the surface data in the map data. Or, draw a common face type without changing the face type (filling pattern) of face data for each data, or use a common line without changing the line type (line pattern) of line data for each line data. Draw with a seed, or draw with a common display color without changing the display color for each data, and display it faithfully according to the map data after releasing a high-speed map display request. It is the one.

[0015]

According to the present invention, when a high-speed map display request is generated, the present invention interprets surface data as line data and draws only a frame, or draws a common drawing without changing the drawing-related attribute for each drawing data. Since the map is drawn with the attribute, it is possible to prevent the map from scrolling slowly as in the conventional case, or to prevent the map display from being unattractive such as a blank map by trying to increase the scroll speed forcibly.

[0016]

1 is a block diagram showing the construction of an on-vehicle map display device according to the present invention. In this figure, reference numeral 10
Reference numeral 1 denotes a map data storage means for storing digitized navigation data and map data, which comprises a data recording device such as a semiconductor memory or a CD-ROM, and 102 retrieves peripheral map data from the longitude and latitude of a desired point. The map data searching means 100 is for the map searching means 102 when a high speed map display request such as scrolling is issued.
The data processing means for processing and outputting the map data searched by the method so as to follow the scrolling operation, 104 is the map data searched by the map searching means 102, or the above-mentioned when the high-speed map display request is issued. It is a map display unit that draws map data that has been processed by the data processing unit 100 or has not been processed into an image memory or the like and displays it on a liquid crystal, a CRT display, or the like.

The map data includes line data for displaying roads, administrative circles, railways, rivers, etc., surface data for displaying oceans, lakes, parks, green spaces, facilities, etc., and place names, facility names, etc. It consists of character data for In addition, regarding roads, high-grade roads (highways, national roads, etc.) are displayed with thicker lines than other roads, and in order to make it easier to distinguish administrative circles and railways from roads, It is common to change the pattern to a dotted line and display it.

The map data is divided into units of a certain division (generally divisions having a certain width of longitude and latitude) for easy management, and it is desired to display a map of an area including division boundaries. Draws and displays the map data on both sides of the boundary. Therefore, when crossing the boundary of a section by scrolling or the like, the map data of a new section must be read from the map data storage means 1, and it usually takes a little time to display as compared with the scroll display in the section. Is.

As described above, the internal structure of the map data is composed of line data, surface data, and character data, but the order of drawing these data is generally surface data that may be underlaid with other data. In many cases, the line data is drawn first, and the character data that cannot be read even if a part is missing is drawn last. Also, in the same line data, considering the appearance when displayed, for example, if it is data related to roads, low roads such as ordinary roads should be drawn ahead of the drawing procedure, that is, drawn first. ,
High-grade roads such as highways and national roads are arranged in the map data storage means 1 in the back and arranged in order so that they can be drawn in the order in which they are arranged. It is common to prevent The method of storing the map data in the map data storage means 101 is the same as in the above-mentioned conventional example. For example, regarding the storage of the line data, which is a part of the map data, in the map data storage means 101, the format is as follows. Is the same as the example shown in FIG.

Looking at the storage of the surface data, which is one of the map data, in the map data storage means 101, an example thereof is shown in FIG. As shown in this figure, a plurality of face data such as face data 1, face data 2, ..., Face data n are stored in the face data storage area of the map data storage means 101. Surface data number information 201 is generated and stored to represent the total number of surface data. Looking at, for example, the surface data 1 in order to see the structure of the information about each surface data in detail, the surface data 1 includes line color information 203 which is data regarding the surface color of the surface data 1 and the type of the surface. Surface type information 204 that is data relating to the surface, coordinate number information 205 of the surface that represents the number of coordinates required to display the surface, and coordinate data that is necessary to actually display the surface on the screen. It is composed of coordinate information 206 (coordinates 1, ..., Coordinates m). The same applies to surface data 2, surface data 3 ...

Since the data processing means 100 processes and outputs the data by various methods so as to follow the scrolling operation at the time of high speed map display, one or a plurality of functional units corresponding to each method are combined. ,
It has in the form of hardware or software.
As an example of the functional unit, surface data omitting means 103,
Line data display color standardizing means 105, line width standardizing means 10
6, line type commonizing means 107, surface data display color commonizing means 108, character data display color commonizing means 109, display color commonizing means 110, and surface type commonizing means 111. The surface data omitting means 103 is a means for interpreting the surface data in the map data searched by the map searching means 102 as line data and converting the surface data into a form of omitted data without filling the inside. The line data display color standardizing means 105 is a means for displaying all the plurality of line data in the map data in the same color. The surface data display color standardizing means 108
This is a means for displaying all the parts corresponding to the surface in the map data in the same color. Therefore, the map displayed on the map display screen is displayed in a single color, and roads, rivers, etc. are drawn only by lines on it. The character data display color standardizing means 109
This is a means for displaying all the data relating to the characters in the map data in the same color. The display color standardizing means 110 is
This is a means for standardizing the colors displayed on the map display screen.
The line width unifying unit 106 is a unit that draws the line widths of a plurality of line data in the map data in common. The line type commonizing unit 107 is a unit that draws the line types (line patterns) of a plurality of line data in the map data in common and displays them on the display screen. The face type commonizing unit 111 is a unit that draws a common face type (field pattern) of a plurality of face data in the map data and displays it on the display screen.

In the present embodiment, the data processing means 10
A case where the surface data omitting means 103 is applied as 0 will be described. The surface data omitting means 103 may be added with a function of filling the inside of the surface data according to the map data when a high-speed map display request is canceled.
When scrolling is stopped, the original beautiful map can be displayed.

FIG. 3 shows an example of an algorithm for displaying surface data with reference to the data shown in FIG. Hereinafter, FIG.
The display operation of the surface in the display device of the present embodiment will be described with reference to FIGS. When this drawing operation is started, first, in step 36, the map search means 102 acquires the number information 201 of surface data from the map data storage means 101, and acquires one surface data (surface data 1, surface data 1 described above). Recognize how many times the following processing executed for each of data 2, ..., Surface data n) should be repeated. Next, at step 37, the address for referring to the data is set to the top data, which is the surface data 1. Further, in step 38, the surface color information 20 is read from the map data storage means 102.
3 is acquired and the color of the surface to be drawn is set in the drawing processor, the drawing library, or the like. In this case, processing with a general-purpose processor without using the drawing processor or the drawing library does not deviate from the gist of the present invention and does not impair the effect. After the processing of step 38, in step 39,
It is checked whether the current map display request is a normal map display or a high-speed map display when scrolling. Then, in the case of the normal map display, the process proceeds to step 40, and the surface type information 204 (filling pattern when filling the closed area) of the surface data is acquired and set in the drawing processor or the drawing library. Step 3
When it is determined in 9 that the map display request is a high-speed map display at the time of scrolling, since the inside of the surface data is not painted, it is not necessary to acquire the surface type information 204 and step 40 is skipped. Then, in step 41, information 2 of the number of coordinates (also called the number of interpolation points) of this surface data
05 is acquired from the map data storage means 101, and the number of coordinates to be acquired in each subsequent processing step is recognized.

In step 42, the coordinate information 20 of the surface data
6 is acquired, and in the following step 43, it is checked whether or not all coordinate information corresponding to the number of coordinates recognized in the process of the previous step 41 has been obtained. If all coordinate information has not been obtained, the process returns to step 42. The acquisition process of the coordinate information 206 is repeated until all the coordinate information (that is, the coordinate 1 to the coordinate m) is obtained, and when all the coordinate information 206 is obtained, the process proceeds to the next step. In step 44, similarly to step 39, it is checked whether the current map display request is a normal map display or a high-speed map display when scrolling. Then, in the case of a normal map display, the process proceeds to step 45, and the display color, the type of surface, and the coordinate sequence for displaying the surface acquired up to step 43 are used to display the surface by the drawing processor or the drawing library. Data is drawn and the inside is filled based on the filling pattern of the surface type information 204. When it is determined in step 44 that the map display request is high-speed map display during scrolling, the process proceeds to step 46, where the line color is interpreted using the display color and the coordinate sequence, and only the frame is drawn. At this time, it is not necessary to pay attention to the line width and the line type.

After the processing of step 45 or step 46 is completed, it is checked in step 47 whether or not all the surface data acquired in step 36 has been drawn, and if all the surface data have not been drawn. ,
In step 48, the reference address is moved to the next surface data and then the process returns to step 36 to repeat the drawing of the surface data until all the surface data (that is, surface data 1 to surface data n) is drawn. If all the surface data have been drawn, it is judged that the drawing in this section is completed.

When the above processing operation is executed for the line data and the character data, the display of the map data of the section is completed. If the area to be displayed includes the boundary of the partition of the map data, the map data of the boundary may be drawn and displayed. In the case of character data, the coordinate for displaying the character is not 1
Usually, it has only points, and in some cases, the size of characters and the direction in which character strings are arranged are added as attributes.

In this embodiment, the map display screen when the normal map display is performed is as shown in FIG.
The map display screen 25 is the same as that referred to in the description of the conventional example. Further, the map display screen when high-speed map display during scrolling is performed in this embodiment is as shown in FIG. Compared with the map displayed on the map display screen 25 of FIG. 11, the map displayed on the map display screen 35 is not filled with the inside of the surface data (specifically, the pond 26 and the river 27, 28, and the field 29 is filled in FIG. 11, but is not filled like 26a, 27a, 28a, and 29a in FIG. 4), which is a somewhat simplified map. The function of is fully exerted. The map displayed on the map display screen 35 is shown in FIG.
Compared with the map displayed on the map display screen 30 of FIG.

The above is an example of a case where a high-speed map display is realized by devising the drawing of the surface data. However, even if the drawing of the line data is devised, it does not depart from the gist of the present invention. Also, the map display can be realized without impairing the effect. That is, the data processing means 100 is replaced by the surface data omitting means 10 described above.
Not only 3 but also other functional units as shown in FIG. As other functional units, for example, line data display color standardizing means 105 for drawing the display colors of a plurality of line data in the map data in common,
Alternatively, the line data width commonizing means 106 for drawing the line widths of a plurality of line data in the map data in common, or the line type (line pattern) of the plurality of line data in the map data.
Will be described with reference to FIG. 4, FIG. 5 and FIG. Here, FIG. 9 is a diagram showing an example of a storage format of map data in the map display device of the present embodiment, which is also incorporated in the conventional map display device as described above.

FIG. 5 is a diagram showing an example of an algorithm for displaying line data with reference to the data of FIG. When the drawing and displaying operation of the line data is started, first, in a processing step 51, the map searching means 102 acquires the number information 5 of the line data from the map data storing means 101, and the line data unit (first Recognize how many times the following processing executed for each of the line data 1, line data 2, ... Next, at step 52, the address for referring to the data is set to the line data 1 which is the top data. Then, in step 53, it is checked whether the current map display request is a normal map display or a high-speed map display such as scrolling. If it is determined that the request is a normal map display request, the process proceeds to step 54 to acquire the line color information 6 from the map data storage means 101 and set the line color to be drawn in the drawing processor or drawing library. Then, the process proceeds to step 55. On the other hand, when it is determined in step 53 that the map display request for scrolling or the like is high-speed, the display color information is displayed in common because the display colors are displayed in common.
Does not need to be acquired and step 54 is skipped and the process proceeds to step 55. In step 55, the line width information 7 is acquired from the map data storage means 101 and the width of the line to be drawn is set in the drawing processor or drawing library.
In 6, the line type information 8 is acquired from the map data storage means 101, that is, the line data type (line pattern) is acquired and the line type to be drawn is set in the drawing processor, the drawing library, or the like. Even if a general-purpose processor is used without using the drawing processor or the drawing library, it does not deviate from the gist of the present invention or impair the effect. Then step 57
In step 1, the coordinate number information (also referred to as the number of interpolation points) 9 of one line data is acquired from the map data storage means 101, and the number of coordinates to be acquired in each subsequent processing step is recognized. In step 58, the coordinate information 10 of the line data is acquired.

In step 59, the previous step 57 is executed.
It is checked whether or not all coordinate information corresponding to the number of coordinates recognized in the process of step 5 has been obtained. If all coordinate information has not been obtained, the process returns to step 58 to obtain all coordinate information (that is, from coordinate 1 to coordinate m). ) Is obtained repeatedly, and when all the coordinate information 10 is obtained, the process proceeds to the next step 60. In step 60, line data is drawn by the drawing processor or drawing library based on the display color of the line, the width of the line, the type of line, and the coordinate sequence forming the line acquired up to the previous step. In the case of high-speed map display, the display color of each line data is not changed in this step, and the display color of the previous line data or the default color is used. In step 61, it is checked whether drawing has been performed by the number of line data acquired in step 51. If all line data has not been drawn, the address referred to in step 62 is moved to the next line data. By returning to the step 53 from step 53, the drawing of the line data is repeated until all the line data (that is, the line data 1 to the line data n) is drawn. Judge that it is finished. When the above processing operation is executed for the plane data and the character data, the display of the map data of the section is completed.

As in the above embodiment, not only is the display color for each line data not changed, but steps 53 to 56 in FIG. 5 are changed to the line width for each line data as shown in FIG. It may be replaced with a processing operation that does not change, or may be replaced with a processing operation that does not change the line type (line pattern) for each line data as shown in FIG. The combination does not deviate from the gist of the present invention or impair the effect.

In the algorithm of FIG. 6, after the address referred to in step 52 is set to the head data in the algorithm of FIG. 5, the line color information 6 is acquired from the map data storage means 101 in step 63 and the line to be drawn is drawn. Set the color of to the drawing processor, drawing library, etc.,
Then, in step 64, it is checked whether the current map display request is a normal map display or a high-speed map display such as scrolling. When it is determined that the map is a normal map display, the process proceeds to step 65, the line width information 7 is acquired from the map data storage means 101, and the width of the line to be drawn is set in the drawing processor or the drawing library. Then, the process proceeds to step 66. On the other hand, step 6
When it is determined in 4 that the request for high-speed map display such as scrolling is made, the display width is displayed in common so that it is not necessary to acquire the display width information 7 and step 65 is skipped and the process proceeds to step 66.

In step 66, the map data storage means 10
The line type information 8 to 1, that is, the type of line data (line pattern) is acquired and the type of the line to be drawn is set in the drawing processor, the drawing library, or the like, and then the process proceeds to step 57 in FIG. In this case, step 60
Then, the line width is the default value, not the color. As already described in the operation description with reference to FIG. 5, even if processing is performed by a general-purpose processor without using the drawing processor or drawing library, it does not deviate from the gist of the present invention or impair the effect. Absent.

In the algorithm of FIG. 7, after the address referred to in step 52 is set to the head data in the algorithm of FIG. 5, the line color information 6 is acquired from the map data storage means 101 in step 67 and the line to be drawn is drawn. Set the color of to the drawing processor, drawing library, etc.,
In step 68, the map data storage means 101
The line width information 7 is acquired from the above, and the width of the line to be drawn is set in the drawing processor, the drawing library, or the like. Then step 6
In step 9, it is checked whether the current map display request is a normal map display or a high-speed map display such as scrolling. When it is determined that the map is a normal map display, the process proceeds to step 70 to acquire the line type information 8, that is, the type of line data (line pattern) and the type of the line to be drawn, such as a drawing processor or a drawing library. Is set, and then the process proceeds to step 57 in FIG. On the other hand, if it is determined in step 69 that the request for high-speed map display such as scrolling is made, the line data type is displayed in common, so there is no need to acquire the line shelf information 8, and step 70 is skipped. Then, the process proceeds to step 57 in step 5. In this case, in step 60, not the color or line width but the line type (line pattern) becomes the default type (pattern). Even in this case, as already described in the operation description with reference to FIG. 5, even if the processing is performed by a general-purpose processor without using the drawing processor or the drawing library, it deviates from the gist of the present invention or impairs the effect. It's not a thing.

As described above, the processing of FIGS. 6 and 7 is obtained by replacing the processing of steps 53 to 56 in FIG. 5 with another processing operation.
6 in place of step 55 in the processing operation of FIG.
The processing operations of steps 4 and 65 may be incorporated, or the processing operations of steps 69 and 70 of FIG. 7 may be incorporated instead of step 56 in the processing operations of FIG. Furthermore, a combination of the above processing operations, that is, step 55 and step 5 in the processing operation of FIG.
Instead of 6, the processing operations of both steps 64 and 65 of FIG. 6 and steps 69 and 70 of FIG. 7 may be incorporated.

Similarly, as the data processing means 100 in FIG. 1, the surface data display color commonizing means 108 for drawing the display colors of a plurality of surface data in common, or the display color of a plurality of character data is used. Character data display color common means 109 for drawing in common, or surface data
Instead of the display color commonizing means 110 that draws the display colors in common without distinguishing between the line data and the character data, or the face type commonizing means 111 that draws in common a plurality of surface types (fill patterns). It does not deviate from the gist of the present invention or impair the effects.

Therefore, according to the above-described embodiment, it is possible to display a map overcoming the problems of the conventional map display device.

[0038]

As described above, according to the present invention,
In addition to normal map display, even when a high-speed map display request such as scrolling occurs, the drawing speed is improved by devising the drawing of surface data, line data, and character data, so a white map is displayed and it looks bad. In addition, since the display is performed at high speed, the driver of the vehicle is not restricted by the operation, and the safety of road traffic is not hindered.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an example of a storage format of surface data in map data in the embodiment.

FIG. 3 is a flowchart for explaining a high-speed map display processing operation by omitting surface data in the above embodiment.

FIG. 4 is a diagram showing a map display screen obtained by the high-speed map display processing operation shown in FIG. 3 in the embodiment.

FIG. 5 is a flow chart for explaining a high-speed map display processing operation by making line data display colors common in the embodiment.

FIG. 6 is a flowchart for explaining a high-speed map display processing operation by making line width of line data common in the embodiment.

FIG. 7 is a flowchart for explaining a high-speed map display processing operation by making line types of line data common in the above-described embodiment.

FIG. 8 is a block diagram showing an example of a conventional vehicle-mounted map display device.

FIG. 9 is a diagram showing an example of a storage format of line data in map data in a general vehicle-mounted map display device.

FIG. 10 is a flowchart illustrating a map display processing operation for drawing line data in a conventional vehicle-mounted map display device.

FIG. 11 is a diagram showing a map display screen obtained by a normal map display processing operation in the in-vehicle map display device in general.

FIG. 12 is a diagram showing a map display screen obtained by a high-speed map display processing operation in the conventional vehicle-mounted map display device.

[Explanation of symbols]

 24 Road network 25 Map display screen (during normal map display) 26 Pond 27, 28 River 29 Field 30, 35 Map display screen (during high speed map display) 31 Vehicle 32 Road 100 Data processing means 101 Map data storage means 102 Map Search means 103 Surface data omission means 104 Map display means 105 Line data display color standardization means 106 Line width standardization means 107 Line type standardization means 108 Surface data display color standardization means 109 Character data display color standardization means 110 Display color Commonizing means 111 Face type commonizing means

Claims (7)

[Claims] 1. A map data storage means for storing map data, a map search means for searching map data around a desired point, a data processing means for processing the map data with a certain algorithm, and a map data image. A map display means for drawing in the memory etc. and displaying it on the display is provided, and when a request to display the map at high speed is made, the data processing means processes the map data with a certain algorithm to simplify the map data. An on-vehicle map display device, characterized in that the processed map data is drawn on an image memory or the like and displayed on a map display means. 2. When the request for displaying the map at high speed is generated, a surface data omitting means for interpreting as line data without filling the inside of the surface data in the retrieved map data is provided as a data processing means. Claim 1 characterized by
The in-vehicle map display device described. 3. A data display color standardizing means for causing a common display color of a plurality of data having the same attribute among the map data to be displayed on the map display means when a request for displaying the map at high speed is generated. The vehicle-mounted map display device according to claim 1 or 2, further comprising: as data processing means. 4. The on-vehicle map display device according to claim 3, wherein the data having the same attribute is at least one of line data, surface data, and character data. 5. When the request for displaying the map at a high speed is generated, the data processing means has a line width unifying means for displaying the map data on the map displaying means by making the line widths of a plurality of line data of the map data common. The in-vehicle map display device according to any one of claims 1 to 4, wherein 6. A line type commonizing means as a data processing means for displaying the map display means with a common line type of a plurality of line data of the map data when a request for displaying the map at high speed is generated. 6. The method according to claim 1, wherein
The in-vehicle map display device according to any one of 1. 7. When the request for displaying the map at high speed is issued, the face type standardizing means for displaying the same fill type inside the plurality of face data of the map data on the map display means is used as the data processing means. The vehicle-mounted map display device according to any one of claims 1 to 6, further comprising: