JPH0729410U - In-vehicle navigation device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an in-vehicle navigation device capable of expressing a good-looking map by holding an appropriate number of landmarks in any hierarchy of maps. [Structure] When displaying map data and landmarks in a superimposed manner, it is determined whether the number of landmarks that can be displayed in one area exceeds a predetermined number, and the number of landmarks exceeds the predetermined number. In this case, control is performed so that landmarks beyond the limit are not displayed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle-mounted navigation device that superimposes and displays map data and landmarks to perform predetermined navigation control.

[0002]

[Prior art]

 In a car navigation system that displays map data and landmarks in a superimposed manner, it is necessary to prepare the landmarks in the map database in advance as data. Table 1 shows an example of landmarks that have been converted into data. An example is shown in which 1,000 landmarks are used as the landmarks necessary to construct a certain map database, and these landmarks are converted into data. Each element has a classification called an attribute. This attribute is classified according to the type of facility, and each attribute is represented by a numerical value called a class for easy expression. For example, the municipal office is represented by class 1.

[0003]

[Table 1]

Further, the digital map database having a hierarchical structure has a rule in the data which is conventionally held for each hierarchy. For example, a rule is that a map of a certain level has landmarks of class 1 and 2, and a map of another level has landmarks of class 1, 2, 3 and 4. Usually, the more the map hierarchy that expresses a narrow range has more classes, but the map hierarchy that represents an intermediate range that is neither a narrow range nor a wide range requires sufficient consideration in determining rules. .

[0005]

[Problems to be solved by the device]

 By the way, in the conventional vehicle-mounted navigation device, it is difficult to hold a proper number of landmarks when the landmarks are held in the map hierarchy that represents a certain range, so it is not possible to render a good-looking map. There is a problem. For example, when I tried to make a map of a certain level have landmarks of Classes 1, 3, and 4, the number of landmarks was too small and it looked bad as a map. If you look at it, the number of landmarks will become too large and the landmarks will overlap each other, which may result in a map failure. In other words, when holding a landmark in one layer, the unit must be configured in units of classes, so it may not be possible to hold a moderate number of landmarks.

The present invention has been made in response to the above problems, and has an appropriate number of landmarks in any level of the map so that a map with a good appearance can be displayed. An object of the present invention is to provide a navigation device.

[0007]

[Means for Solving the Problems]

 To achieve the above object, the present invention comprises a map data storage means, a landmark storage means, a display means and a display control means, wherein the display control means superimposes the map data and the land mark on the display means. In the in-vehicle navigation device configured as described above, the display control means includes landmark number detection means for determining whether or not the number of displayable land marks in a predetermined area exceeds a predetermined number. When the number of landmarks exceeds a predetermined number, the number of landmarks exceeding the number is not displayed.

[0008]

According to the structure of the present invention, the display control means for controlling the map data and the landmarks to be displayed on the display means in a superimposed manner is a landmark that can be displayed within a predetermined area by the landmark number detection means. It is determined whether or not the number of marks exceeds a predetermined number, and if the number of landmarks exceeds a predetermined number, control is performed so that the number of landmarks that exceed the number is not displayed. As a result, an appropriate number of landmarks can be held in maps of any hierarchy, and a map that looks good can be expressed.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a vehicle-mounted navigation device according to the present invention. 1 is map data storage means for storing ground map data, 2 is landmark data storage means, 3 is a map storage means. Display means (display) for superimposing and displaying data and landmarks, 4 is a speaker for outputting navigation voice for navigation, 5 is GPS, 6 is a rotation angle sensor and direction sensor attached to the vehicle, and 7 is The display control means controls the control operation and reads the map data and the landmarks from the map data storage means 1 and the landmark storage means 2, respectively, and controls so as to display them on the display means 3 in an overlapping manner. Further, as will be described later, the display control means 7 determines whether or not the number of landmarks that can be displayed in one region (mesh) divided according to the scale of the map exceeds a predetermined number. It is provided with a land mark number detecting means having a function of judging.

Next, the operation of each embodiment of the present invention will be described with reference to the flowchart. FIG. 2 is a flow chart showing a main routine based on the first embodiment. First, in step A, the map data is read from the map data storage means 1 by the control of the display control means 7, and then in step B, this map data is read. It is displayed on the display means 3. Next, in step C, the landmark is read from the landmark storage means 2, and in step D, the map is divided into a plurality of areas according to the scale. For example, if the scale is 1/2000, the area is 200 m square, and if the scale is 1 / 50,000, the area is 500 m square. Next, in step E, landmarks are displayed by being superimposed on the map data, and in step F, it is determined whether or not there are a preset number of landmarks in one region, for example, three or more. If YES, the flow advances to step G, where only the landmark having the longitude and latitude at the upper left of the area is left and the others are deleted. Then, after reading the data of the own vehicle position in step H, the navigation control is started in step I. If NO at step F, the process jumps to step H.

FIG. 3 is a flow chart showing a subroutine of landmark overlay display based on the second embodiment. In the present embodiment, as shown in FIG. 4, there is shown a method of detecting the presence or absence of a land mark in one area (mesh) from the left to the bottom as shown by the arrow. First, in step A, the position where the X and Y coordinates are 0 is started, and the presence or absence of the landmark is determined in step B. If NO, the flow proceeds to step C, where one pixel in the Y-axis direction is used. After the movement, it is determined in step D whether or not a predetermined pixel has moved in the Y-axis direction. If NO, the flow returns to Step B, and if YES, the flow advances to Step E, where after moving by one pixel in the X-axis direction, at Step F, whether or not a predetermined pixel is moved in the X-axis direction. To judge. If NO, the flow returns to step B, and if YES, the flow advances to step G, where it is determined whether or not there is a next area. If YES, the flow returns to step B, and if NO, the flow returns. If YES in step B, the flow proceeds to step H, where a landmark is displayed and then proceeds to step G.

FIG. 5 is a flow chart showing a subroutine of landmark overlay display based on the third embodiment. In this embodiment, as shown in FIG. 6, there is shown a method of detecting the presence or absence of a landmark in one area in order from the left side to the lower side as shown by the arrow. If there are multiple landmarks in the area, it is displayed as they are. First, in step A, the X and Y coordinates start at positions of 0, and in step B, the presence / absence of landmarks in this one area is determined as shown in FIG. 7. If YES, the flow advances to step G. , Show landmarks here. Subsequently, the flow proceeds to step F, where it is determined whether or not there is a next area. If YES, the flow returns to step B, and if NO, the flow returns.

If NO in step B, the flow proceeds to step C, where it is determined whether all the pixels in the X-axis direction have been moved. In the case of NO, the flow proceeds to step D, where it is moved by one pixel in the X-axis direction, and then in step E, it is determined whether or not all the pixels in the Y-axis direction are moved. If yes, the flow returns to step B. If YES in step C, the flow advances to step H, where it is determined whether all pixels in the Y-axis direction have been moved. If NO, the flow proceeds to step I, where the pixel moves in the Y-axis direction by one pixel, and then the flow returns to step B. If YES in step H, the flow proceeds to step F, and if NO in step E, the flow proceeds to step I.

FIG. 8 is a flow chart showing a subroutine of landmark overlay display based on the fourth embodiment. In this embodiment, as shown in FIG. 9, there is shown a method of detecting the presence or absence of a landmark in one area in order from the left side to the lower side as shown by the arrow. Even if there are multiple landmarks that can overlap in the area, it shows how to prioritize each landmark and display only the landmark with the highest priority. As an example, the case where four landmarks of priority 1, 2, 3, and 4 exist is shown.

First, in step A, the presence / absence of a landmark of priority 1 is determined. If NO, the flow proceeds to step B, in which the presence / absence of a landmark of priority 2 is determined. If NO, the flow proceeds to step C, where it is determined whether or not there is a landmark of priority 3, and if NO, the flow proceeds to step D where it is determined whether or not there is a landmark of priority 4. If NO, the flow proceeds to step E, where it is determined whether or not there is a next area. If YES, the flow returns to step A, and if NO, the flow returns. If YES in steps A, B, C, and D, the flow advances to step F, where a landmark is displayed. Subsequently, the flow proceeds to step E. In the case of the present embodiment, only the landmark with the highest priority of priority 1 is displayed.

As described above, according to each embodiment, when the map data and the landmark are displayed in an overlapping manner, it is determined whether or not the number of landmarks that can be displayed in one area exceeds a predetermined number. When the number of landmarks exceeds the predetermined number, the landmarks are controlled so as not to be displayed.Therefore, an appropriate number of landmarks can be held on any level of the map to make it look good. You can express a good map. In particular, according to the fourth embodiment, even if there are a plurality of landmarks that can be overlapped within one area, by assigning a priority to each landmark, the highest priority can be obtained. Only one landmark with high priority can be selected and displayed, and if necessary, only one landmark can be displayed with the highest priority order. Therefore, the landmark can be efficiently used. It should be noted that in the description in the text, +1 has been explained as moving by one pixel, but it may mean a plurality of predetermined pixels.

[0017]

[Effect of device]

 As described above, according to the present invention, when the map data and the landmark are displayed in an overlapping manner, it is determined whether the number of landmarks that can be displayed in one area exceeds a predetermined number. When the number of landmarks exceeds the predetermined number, the landmarks are controlled so as not to be displayed, so that even if the map of any hierarchy has an appropriate number of landmarks, it will look good. It is possible to express a good map.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a vehicle-mounted navigation device of the present invention.

FIG. 2 is a flowchart illustrating a first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a landmark display control method according to a second embodiment.

FIG. 5 is a flowchart illustrating a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of a landmark display control method according to a third embodiment.

FIG. 7 is an explanatory diagram of a landmark display control method according to a third embodiment.

FIG. 8 is a flowchart illustrating a fourth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a landmark display control method according to a fourth embodiment.

[Explanation of symbols]

 1 map data storage means 2 landmark storage means 3 display means 7 display control means

Claims (1)

[Scope of utility model registration request] 1. A vehicle-mounted device comprising map data storage means, landmark storage means, display means and display control means, the display control means being configured to superimpose map data and landmarks on the display means. In the navigation device for vehicle, the display control means includes landmark number detection means for determining whether or not the number of landmarks that can be displayed in a predetermined area exceeds a predetermined number, and the number of landmarks exceeds the predetermined number. In the case of the above, the vehicle-mounted navigation device is characterized in that the landmark for the excess is not displayed.