JPH112529A - On board navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute high-speed and smooth scrolling without any increase in the memory capacity for storing map information by selecting and aquiring the map information for a large area reduce scale display, and coordinate- transforming the map information to the current display map reduced scale to draw a map. SOLUTION: A map information acquiring means 102 acquires map information spilt-stored on every display reduced scale from a map information storing means. A map range calculating means 103 calculates the map range for previously drawing a display map to be scrolled. A scroll map information select means 105 acquires the current display map reduced scale from a reduced scale storing means 104, selects the map information for a larger area reduced scale display than the current display map reduced scale, and instructs the map information acquiring means 102 to acquire the map information. The acquired map information is coordinatetransformed to the current display map reduced scale by a coordinate transforming means 106, a map is drawn according to the coordinate-transformed map information by a map drawing means 107, and the drawing result of the map is displayed on a display means 108.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle navigation apparatus that continuously scrolls a display map using map information for displaying a scale that is wider than the current scale of the display map.

[0002]

2. Description of the Related Art In a conventional car navigation system,
When the user checks the route from the current position to the destination, or checks the roads around the current position, the user can scroll the display map by pressing the cursor key.

However, in the conventional on-vehicle navigation apparatus, since the map drawing processing time is long and the map information acquisition time is long, the map drawing at the scroll destination cannot be made in time, and the displayed map can be scrolled quickly and smoothly. Was impossible. For this reason, during continuous scrolling, if the map drawing at the scroll destination cannot be made in time, scrolling is temporarily stopped, or scrolling is continued with no map displayed, and the user is prompted. There was a problem of giving discomfort.

[0004] Various devices for solving the above problems have been proposed in the past, and for example, the device described in Japanese Patent Application Laid-Open No. Hei 6-103493 is one example. This device further stores, for each piece of map information corresponding to the display scale value, temporary display map information including partial map information of the map information. , The temporary display map information is displayed. Since the provisional display map information is composed of a part of the map information to be actually displayed, the amount of information is small, and the time from when the user gives an instruction to when the provisional display map information is displayed is reduced. The time is shorter than the time until the map information to be actually displayed is displayed, scrolling can be performed seemingly smoothly, and it is possible to eliminate the discomfort given to the user as described above.

[0005]

However, in such a conventional on-vehicle navigation device, provisional display map information corresponding to the display scale value is stored for each of a plurality of types of display scale values. In addition, the memory capacity for storing the map information increases, and the provisional display map information is stored for each display scale value, so that the acquisition time of the map information is shortened by the reduced amount of information. However, there is a problem that the number of times of obtaining map information is not different from obtaining map information to be actually displayed.

The present invention solves the above-mentioned conventional problems, and provides an in-vehicle navigation device capable of performing high-speed and smooth scrolling without increasing the memory capacity for storing map information. The purpose is to provide.

[0007]

According to the present invention, there is provided an on-vehicle navigation device, comprising: map information storage means for storing map information divided for each display scale; and acquiring map information from the map information storage means. Map information obtaining means for performing, and map information selecting means for scrolling for selecting map information for scale display wider than the current display map scale and instructing the map information obtaining means to obtain map information. A map drawing means for converting the map information acquired by the map information acquisition means to a current display map scale to draw a map, and a display means for displaying a map drawing result. .

According to the present invention, high-speed and smooth scrolling can be performed without increasing the memory capacity for storing the map information by using the map information for displaying the scale on a wide area.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a vehicle-mounted navigation device according to Embodiment 1 of the present invention. In the figure, 101 is map information storage means for storing map information divided for each display scale, 102 is map information acquisition means for acquiring map information from the map information storage means 101, and 103 is a scroll destination. Map range calculating means for calculating a map range to draw the display map in advance, 104 is a scale storage means for storing the current display map scale, and 105 is , And selects map information for scale display that is wider than the current display map scale, and obtains the map information obtaining means 10.
Scroll map information selection means for instructing the acquisition of map information in 2; 106, coordinate conversion means for converting the map information acquired by the map information acquisition means 102 to the current display map scale; 107, coordinate transformation Map drawing means for drawing a map based on the map information subjected to coordinate conversion by means 106,
Reference numeral 108 denotes a display unit for displaying a map drawing result.

The operation will be described below. FIG. 2 is a conceptual diagram of map information for explaining the operation of the in-vehicle navigation device according to the first embodiment of the present invention. U201 to U216 represent units which are the minimum units of the map information. Similarly, FIG. 3 is a conceptual diagram of map information for displaying a scale that is wider than the map information shown in FIG. 2, and U301 to U304 represent units. As shown in FIGS. 2 and 3, the map information storage means 101 stores the map information divided for each display scale. First, the operation during the scroll stop will be described. Assuming that the map information shown in FIG. 2 is currently being displayed, the map range calculation unit 103 calculates the range to be currently displayed. In FIG. 2, reference numeral 220 denotes a range to be displayed in the map information. In this case, the map information obtaining means 102 transmits the map information from the map information storage means 101 to U20 in FIG.
The map information of four units 1, U202, U205, and U206 is acquired. The coordinate conversion means 106 obtains the current display map scale stored in the scale storage means 104 and performs coordinate conversion,
The map drawing means 107 draws a map, and the display means 108 displays a drawing result.

Next, the operation during scrolling will be described. During scrolling of the display map, first, the scrolling map information selecting means 105 acquires the current display map scale from the scale storage means 104, and the current display map scale is obtained. Select map information for scale display that is wider than the scale, and
To get map information. For example, assuming that the map information shown in FIG. 3 is selected as map information for displaying a scale wider than the current display map scale, the map range calculation means 103 calculates the map range of the scroll destination. FIG.
Numeral 320 indicates a range to be displayed in the map information.
In this case, the map information acquisition means 102
From 01, the map information of only U301 in FIG. 3 is acquired.
Thereafter, the operation is the same as the operation during scroll stop, the coordinate conversion means 106 acquires the current display map scale stored in the scale storage means 104, performs coordinate conversion, and the map drawing means 107 draws a map. The display means 108 displays the drawing result. However, when the scroll is stopped by the user's operation, the operation during the scroll stop is performed.

[0013] When the map information for displaying the scale on a wide area is not sufficient for the user, the additional map information for scrolling can be added to the normal map information. FIG. 4 is a configuration diagram of map information for explaining the operation of the in-vehicle navigation device according to the first embodiment of the present invention, and shows the configuration of the map information of one unit. In the figure, 401 is the top of the map information of the unit, 402 is the normal map information used in map display other than scrolling, 403
Is additional map information for scrolling. As shown in FIG. 4, normal map information 402 and additional map information 403 for scrolling are used.
Is stored in a continuous area, it is possible to simultaneously obtain normal map information 402 and scroll additional map information 403 from the head 401 of the map information of the unit.

As described above, according to the present embodiment, the current display map scale is obtained from the scale storage means, map information for scale display that is wider than the current display map scale is selected, and the map information is displayed. By providing the map information selecting means for scrolling to instruct the acquisition means to acquire the map information,
Since the map information for displaying a large scale display scale has a smaller amount of information than the current display map scale, high-speed and smooth scrolling is possible, and the memory capacity for storing the map information does not increase. Furthermore, since the map information for the large scale display is used, a wide range of map information can be acquired at a time, so that high-speed and smooth scrolling can be performed.

(Embodiment 2) FIG. 5 is a block diagram showing a configuration of an in-vehicle navigation device according to Embodiment 2 of the present invention. In the drawing, reference numeral 501 denotes a scroll speed change for instructing a change of the scroll speed. Means 502 is a scroll map information selecting means for automatically changing the selected map information based on a scroll speed change instruction from the scroll speed changing means. Other map information storage means 10
1. Since the map information acquisition unit 102, map range calculation unit 103, scale storage unit 104, coordinate conversion unit 106, map drawing unit 107, and display unit are the same as those described in the first embodiment, the same parts Are given the same reference numerals, and detailed description thereof is omitted.

The operation will be described below. The device shown in the present embodiment is different from the device of the first embodiment in that the scroll speed can be changed after a certain period of time has elapsed since the start of scrolling. The change of the speed is performed according to an instruction of the speed changing unit 501. That is, the scroll map information selecting means 50
2 changes selection of map information for a wide scale display in accordance with a scroll speed change instruction from the scroll speed changing means 501. For example, according to the elapsed time from the start of scrolling, the scroll speed is changed to three stages, that is, a low speed immediately after the start of the scroll, a medium speed after a certain time has elapsed, and a high speed after a certain time has elapsed. In this case, the scrolling map information selecting means 502 selects the current scale display map information at low speed, selects the wide scale map information at medium speed, and further wide scale scale display at high speed. Select map information.

As described above, according to the present embodiment, by providing the scroll speed changing means for instructing the change of the scroll speed, it is possible to change the selection of the map information for a wide scale display. , It becomes easier to respond to the situation.

[0018]

As described above, according to the present invention, there is an advantageous effect that high-speed and smooth scrolling can be performed without increasing the memory capacity for storing map information.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a vehicle-mounted navigation device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of map information for describing an operation of the in-vehicle navigation device according to the first embodiment of the present invention.

FIG. 3 is a conceptual diagram of map information for displaying a reduced scale that is wider than the map information shown in FIG. 2;

FIG. 4 is a configuration diagram of map information for describing an operation of the vehicle-mounted navigation device according to the first embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a vehicle-mounted navigation device according to a second embodiment of the present invention.

[Explanation of symbols]

101: map information storage means, 102: map information acquisition means,
103: map range calculation means, 104: scale storage means, 10
5, 502: scroll map information selection means, 106: coordinate conversion means, 107: map drawing means, 108: display means,
501: scroll speed changing means.

Claims (4)

[Claims] 1. An in-vehicle navigation device capable of continuously scrolling a display map, wherein a map information storage means for storing map information divided for each display scale, and said map information storage means. A map information acquisition unit for acquiring map information from a display map, and a scrolling unit for selecting map information for scale display that is wider than the currently displayed map scale and instructing the map information acquisition unit to acquire map information. Map information selecting means, map drawing means for converting the map information obtained by the map information obtaining means to a current display map scale to draw a map, and display means for displaying a map drawing result. An in-vehicle navigation device provided with: 2. The map information storage means stores additional map information for scrolling, and the map information selecting means for scrolling includes map information for displaying a scale that is wider than a current display map scale and the additional map information. 2. The in-vehicle navigation device according to claim 1, wherein information and information are selected. 3. The in-vehicle navigation device according to claim 2, wherein the map information storage means stores the additional map information for scrolling in an area continuous with the map information used for map display other than scrolling. . 4. A scroll speed changing means for instructing a change of a scroll speed, wherein the scroll map information selecting means automatically selects a scroll speed based on a scroll speed changing instruction from the scroll speed changing means. 2. The in-vehicle navigation device according to claim 1, wherein map information to be changed is changed.