JP6816932B2 - Electronic devices, map display programs and map display methods - Google Patents

Description

The present invention relates to a map display in a navigation device, and more particularly to a map display when traveling around the sea, forests, lakesides, rivers, and the like.

The in-vehicle navigation device detects the position of the own vehicle, reads the detected road map around the position of the own vehicle from the memory, and displays this on the display. Normally, a map centered on the position of the vehicle is displayed on the screen, so when the vehicle travels along the coastline, most of the display of the sea is meaningless in terms of driving, which is useful. The provision of road information will decrease. In order to solve such a problem, the navigation device of Patent Document 1 fixes the map data to the edited display map when there is no map data, and displays the movement of the own vehicle position there. It is possible to avoid meaningless sea display even when driving.

JP-A-5-27682

FIG. 14 is a diagram illustrating a problem of map display of a conventional navigation device. When a flat map is displayed on the display screen 1, the map around the vehicle is displayed so that the vehicle M is located substantially in the center of the display screen 1. In such a map display, when traveling on a road adjacent to the sea, forest, lakeside, river, etc., the display of the sea, etc. occupies a large part of the screen, and it is not possible to sufficiently provide useful information to the user. Sometimes. For example, as shown in FIG. 14, when traveling on the road R of the coastline, nearly the right half of the own vehicle M is displayed as the sea 2, and the map display in which the information provision of the land 3 including the information is not efficient. Become.

An object of the present invention is to solve such a conventional problem, and to provide an electronic device, a map display program, and a map display method capable of efficiently providing a map.

The electronic device according to the present invention has a map display function, and includes a display means for displaying a road map around the position of the own vehicle and a road map displayed by the display means, and provides a small amount of information. A first determination means for determining whether or not the background area corresponds to a display unnecessary area, and a display control means for controlling the display means based on the determination result of the first determination means. The display control means changes the road map from the flat display to the bird's-eye view display when the background area is determined to correspond to the display unnecessary area by the first determination means.

Preferably, the electronic device further includes a second determination means for determining whether or not the road on which the vehicle travels is linear, and the display control means means that the road is linear by the second determination means. If it is determined that there is, a bird's-eye view display is performed looking down from the side where the display unnecessary area exists. Preferably, when the second determination means determines that the road is not straight, the electronic device further determines whether or not the point representing the curvature of the road on which the own vehicle travels is included in the display unnecessary area. When it is determined by the third determination means that the point representing the curve of the road is not included in the display-unnecessary area, the display control means includes the display-unnecessary area side. A bird's-eye view is displayed overlooking the point representing the curvature of the road, and when it is determined that the point representing the curvature of the road is included in the display unnecessary area, the point representing the curvature of the road is referred to as the road. It is moved to the opposite side, and a bird's-eye view display is performed overlooking the moved point from the display unnecessary area side. Preferably, when it is determined that the points representing the curvature of the road are included in the display unnecessary areas existing on both the left and right sides of the road, the display control means displays a bird's-eye view overlooking the traveling direction of the own vehicle. Do. Preferably, the point representing the curvature of the road is obtained from a quadratic curve calculated from a plurality of reference points on the road. Preferably, the first determination means determines that the background area is a display-unnecessary area when the background area has a display area equal to or larger than a certain level. Preferably the background area is a sea, forest, lakeside or river, and the background area is an area that does not include facilities, landmarks or roads.

The map display program according to the present invention is executed by a control means of an electronic device including a display means for displaying a road map around the position of the own vehicle and a control means for controlling the display means. When the background area is a background area included in the road map and contains a small amount of information, and the step of determining whether or not the background area corresponds to the display unnecessary area and the determination step indicate that the background area corresponds to the display unnecessary area. When it is determined, it has a step of changing the road map from the flat display to the bird's-eye view display.

The map display method according to the present invention is in an electronic device including a display means for displaying a road map around the position of the own vehicle and a control means for controlling the display means, and is included in the road map. In addition, when the background area contains a small amount of information and the step of determining whether or not the background area corresponds to the display unnecessary area and the determination step determine that the background area corresponds to the display unnecessary area, It has a step of changing the road map from a flat display to a bird's-eye view display.

According to the present invention, when the background area is determined to be a display unnecessary area, the display area of the display unnecessary area is reduced by switching the road map from the flat display to the bird's-eye view display, and the display of the area containing useful information is displayed. The area can be increased. As a result, the user can perform the optimum map display in consideration of the traveling direction.

It is a block diagram which shows the structure of the vehicle-mounted device which concerns on embodiment of this invention. It is a figure which shows the example of acquiring the information from another distribution site. It is a figure explaining the structure of the map data which concerns on embodiment of this invention. It is a figure which shows the functional structure of the map display program which concerns on embodiment of this invention. It is a figure explaining the determination method of the display unnecessary area determination part which concerns on embodiment of this invention. It is a figure which shows the extraction example of the reference point extraction part which concerns on Example of this invention. It is a figure which illustrates the determination example of the left-right determination part which concerns on embodiment of this invention. It is a flow chart which shows the map display operation which concerns on embodiment of this invention. It is a figure explaining the display mode in the case of approximating a quadratic curve to a straight line. It is a figure which shows the road away from the display unnecessary area. It is a figure which shows the road along the display unnecessary area. It is a flow chart which shows the map display operation which concerns on the modification of the Example of this invention. It is a figure explaining the determination of the display target point which concerns on a modification. It is a figure explaining the problem of the map display of the conventional navigation device.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. The electronic device according to the embodiment of the present invention is an in-vehicle device such as a navigation device fixedly mounted on a moving body such as an automobile, a portable computer device that can be carried around, or a tablet-type computer device. Can be done. The electronic device according to the present invention is equipped with a map display function in combination with a navigation function, and displays, for example, a road map around the position of the own vehicle. The map display function displays the road map so that the position of the own vehicle is located near the center of the display screen, and it is possible to scroll the road map as the position of the own vehicle changes. In addition to these, the electronic device may be provided with, for example, a function of playing audio / video data, a function of receiving a television / radio broadcast, a function of executing application software, and the like in an integrated manner. ..

FIG. 1 is a block diagram showing a configuration of an in-vehicle device according to an embodiment of the present invention. The in-vehicle device 10 includes an input unit 100, a position information calculation unit 110, a navigation unit 120, a display unit 130, a voice output unit 140, a communication unit 150, a storage unit 160, and a control unit 170. However, the configuration shown here is an example, and the in-vehicle device 10 may include other functions.

The input unit 100 receives an instruction from the user by an input key device, a voice input recognition device, a touch panel, or the like, and provides the instruction to the control unit 170. The position information calculation unit 110 calculates the current position of the own vehicle based on the GPS signal transmitted from the GPS satellite and the output of the directional sensor such as the gyro sensor. For example, the navigation unit 120 searches for a route from the current location to the destination calculated by the position information calculation unit 110, outputs the voice of the searched route from the voice output unit 140, or a road map around the vehicle position. Is displayed on the display unit 130.

The display unit 130 includes a display device such as a liquid crystal display or an organic EL, and displays, for example, a road map image generated by the navigation unit 120. The voice output unit 140 outputs navigation voice guidance and other driving support information.

The communication unit 150 enables data to be sent and received to and from various external devices. For example, as shown in FIG. 2, the communication unit 150 accesses the location information distribution site 152 via the network NW, acquires the vehicle position information from the location information distribution site 152, or accesses the map data distribution site 154, and there. You can get the necessary map data from the site, or you can access the road traffic information distribution site 156 and get detailed information about the road traffic information from there. The own vehicle position information obtained from the position information distribution site 152 can be used instead of the own vehicle position information calculated by the position information calculation unit 110. Further, when the map data is distributed from the map data distribution site 154, the distributed map data is used by the navigation unit 120.

The storage unit 160 can store application software and programs executed by the control unit 170, map data required by the navigation unit 120, and the like. The map data includes node data related to intersections, link data related to roads, facility data related to facilities, background data related to the background of the sea, forests, lakesides, and the like. FIG. 3 shows an example of map data of this embodiment. The map data 162 includes link data 164, node data 166, facility data 168, and background data 169. Link data 164 is data related to an intersection and a road connecting the intersection, and includes the latitude and longitude of the start and end points of the road, the road type (national road, general road, prefectural road, highway, toll road, etc.), and the traveling direction of the road (). For example, it includes data such as left-hand drive or right-side drive), width, regulation (eg, one-way), and number of lanes. Further, the link data 164 includes a display unnecessary area flag. The display-unnecessary area flag indicates whether or not the background area such as the sea, forest, lakeside, river, etc. occupies a certain area (for example, half or more) of the display screen when traveling on the link. It is binary data, for example, if the background area is equal to or larger than a certain area of the display screen, the background area is regarded as a display unnecessary area, the display unnecessary area flag is set to "1", and the background area is constant. If it is less than the area, it is considered that display is not necessary, and the display unnecessary area flag is set to "0". However, facilities, landmarks, etc. are indicated in the background area such as the sea, forests, lakesides, rivers, etc. When information is included, it is necessary to display the background area. Therefore, even if the background area is equal to or larger than a certain area of the display area, the flag is set to "0". The display unnecessary area flag is set. , Map data 162 can be prepared in advance, but in addition to that, when the user determines that an unnecessary background area is displayed on the display unit 130 while traveling on the road, the input unit 100 The display-unnecessary area flag related to the road (link) on which the own vehicle is traveling may be set to "1".

The node data 166 includes data such as an intersection node flag indicating whether or not the node is an intersection, and a connection relationship between an entry link connected to the node and an escape link exiting the node. The facility data 168 includes data such as a name, location information, category, address, telephone number, and icon. The background data 169 includes polygon data representing the sea, forests, lakes, rivers, and the like as a background when drawing roads and facilities.

In a preferred embodiment, the control unit 170 is composed of a microcontroller including a ROM, a RAM, and the like, and the ROM or the RAM can store various programs for controlling the operation of each unit of the in-vehicle device 10. This embodiment includes a map display program that displays a map based on the above-mentioned display unnecessary area flag.

FIG. 4 is a diagram showing a functional configuration of the map display program according to the present embodiment. The map display program 200 includes a display unnecessary area determination unit 210, a reference point extraction unit 220, a quadratic curve calculation unit 230, and a straight line. Includes an approximation determination unit 240, a left / right determination unit 250, a tangent line calculation unit 260, a perpendicular line calculation unit 270, a perpendicular line intersection calculation unit 280, an inclusion determination unit 290, a display target point determination unit 300, and a display mode change unit 310.

When the road map is two-dimensionally displayed (planar display) by the navigation unit 120, the display unnecessary area determination unit 210 determines whether or not the background area is display unnecessary based on the display unnecessary area flag. As shown in FIG. 5, when the coordinates (Xa, Ya), (Xa, Yb), (Xb, Yb), (Xb, Ya) of the corners of the display unit 130, the display position of the own vehicle M is (Xb, Ya). The position in the X direction of Xa + Xb) / 2 is determined to be a position in the Y direction that is slightly smaller than (Ya + Yb) / 2, and the map around the own vehicle M is displayed based on the position. When the own vehicle travels on the road R1 on the coastline, the background area 132 representing the sea is displayed on the right side of the display unit 130, and the land 134 representing the urban area is displayed on the left side. If the flag of the road R1 is "1", the display unnecessary area determination unit 210 determines that the display of the background area 132 is unnecessary, and if it is "0", the display of the background area 132 is necessary. judge. In addition to referring to the display unnecessary area flag, the display unnecessary area determination unit 210 calculates the ratio of the display area of the background data 132 displayed on the display unit 130 at any time, and the ratio of the display area becomes a certain value or more. At this time, the background area 132 can be determined to be a display unnecessary area. Further, it may be determined whether or not the area is a display-unnecessary area based on either the determination based on the display-unnecessary area flag or the determination based on the ratio of the display area, or the determination results of both.

When it is determined that the background area 132 is a display-unnecessary area, the reference point extraction unit 220 extracts a plurality of points on the road in the traveling direction of the own vehicle from the position of the own vehicle. For example, a point that is within a certain distance from the vehicle position and is displayed on the display unit 130 is extracted. FIG. 6 shows an extraction example of the reference point extraction unit 220. The reference point extraction unit 220 extracts three points on the road including the point of the own vehicle M, preferably the point C of the own vehicle M, the boundary point A of the road display of the display unit 130, and the points A and C. The intermediate point B of the journey connecting the above is extracted as a reference point.

The quadratic curve calculation unit 230 calculates a quadratic curve that passes through a plurality of reference points extracted by the reference point extraction unit 220, or a quadratic curve that approximates the plurality of reference points. For example, as shown in FIG. 6, when the reference points A, B, and C are extracted, a quadratic curve passing through these three points or a quadratic curve approximating the three points is calculated. The quadratic curve calculated in this case is a quadratic curve with the reference point B as the apex.

The straight line approximation determination unit 240 determines whether or not the quadratic curve calculated by the quadratic curve calculation unit 230 approximates a straight line. The degree of approximation can be set arbitrarily. The left / right determination unit 250 determines whether the display unnecessary area exists on the left or right side of the own vehicle position. This determination is made, for example, by comparing the position coordinates of the own vehicle or the road on which the own vehicle is traveling with the position coordinates of the polygon data representing the background area. For example, as shown in FIG. 7, the coordinates of the current position of the own vehicle M are (X1, Y1), and the coordinates of one apex or the center coordinates of a plurality of apex of the polygon data representing the sea which is the background area are (X1, Y1). X2, Y2), and when the traveling direction of the own vehicle M is Q, if X1 <X2, the left and right determination unit 250 determines that the sea in the background region exists on the right side of the own vehicle M, and X1> If it is X2, it is determined that the background area exists on the left side of the own vehicle M.

When the straight line approximation determination unit 240 determines that the quadratic curve does not approximate a straight line, the tangent calculation unit 260 has the reference points extracted by the reference point extraction unit 220 other than the reference points related to the vehicle position. Calculate the tangent to the reference point. As shown in FIG. 6, the tangent line calculation unit 260 calculates tangent lines L1 and L2 for reference points A and B other than the reference point C.

The perpendicular calculation unit 270 calculates a perpendicular to the tangent line calculated by the tangent calculation unit 260. In the example of FIG. 6, the perpendicular line H1 with respect to the tangent line L1 and the perpendicular line H2 with respect to the tangent line L2 are calculated. The perpendicular line H1 passes through the reference point A, and the perpendicular line H2 passes through the reference point B. The perpendicular intersection calculation unit 280 calculates the intersection coordinates of the perpendiculars calculated by the perpendicular calculation unit 270. In the example of FIG. 6, the perpendicular intersection calculation unit 280 calculates the coordinates (X3, Y3) of the intersection D between the perpendicular H1 and the perpendicular H2. To calculate a quadratic curve from a plurality of reference points on a road, calculate a perpendicular line from a tangent line of the reference point, and calculate an intersection of the perpendicular lines is to calculate a center of curvature representing the curvature of the road.

The inclusion determination unit 290 determines whether or not the intersection D of the perpendicular lines is included in the display unnecessary area. The determination result of the left / right determination unit 250 is used for this determination. In the example of FIG. 6, the position coordinates (X3, Y3) of the intersection D and the position coordinates (X1, Y1) of the own vehicle M are compared, and it is determined whether the intersection D is on the left or right side of the own vehicle M. If the intersection D is on the left side of the own vehicle M, it is determined that the intersection D is not included in the display unnecessary area, and if the intersection D is on the right side of the own vehicle M, the intersection D is included in the display unnecessary area. Judged to be In addition to this, it may be determined whether or not the intersection D is included in the display unnecessary area by comparing the intersection D with the coordinates of the polygon data representing the background area.

The display target point determination unit 300 determines the display target point based on the determination results of the left / right determination unit 250 and the inclusion determination unit 290. When the inclusion determination unit 290 determines that the intersection D is not included in the display unnecessary area, the display target point determination unit 300 determines the intersection D as the display target point. Further, when the inclusion determination unit 290 determines that the intersection D is included in the display unnecessary area, the display target point determination unit 300 has an intersection d that is line-symmetric with the intersection D with respect to the straight line connecting the perpendiculars H1 and H2. Is determined as the display target point. Further, when it is determined that the quadratic curve is approximated to a straight line, the display target point determination unit 300 determines the display target point for bird's-eye view display according to the determination result of the left / right determination unit 250. For example, when it is determined that the display-unnecessary area is on the right side, a display target point that looks down from the right side to the left side at a certain bird's-eye view angle and a certain intersection direction is determined, and conversely, the display-free area is on the left side. If it is determined to be, a display target point that looks down from the left side to the right side at a constant bird's-eye view angle and crossing direction is determined.

When the display unnecessary area determination unit 210 determines that the background area is a display unnecessary area of a constant display area area, the display mode changing unit 310 changes the display mode so that the display area of the display unnecessary area becomes small. Specifically, the display area of the display-unnecessary area is reduced by changing the display mode to a bird's-eye view display centered on the land side including information.

Next, the map display operation according to the embodiment of the present invention will be described with reference to the operation flow of FIG. The map display program 200 is started when the navigation unit 120 is operated. When the vehicle position is calculated and the road map around the vehicle position is displayed on the display unit 130, the display unnecessary area determination unit 210 determines whether or not the background area is a display unnecessary area (S100). That is, when the display area of the background area such as the sea, river, or forest that does not include the information of the facility or the like is a certain percentage or more, it is determined as the display unnecessary area. When it is determined that the display unnecessary area is equal to or larger than a certain display area, a plurality of reference points including the position of the own vehicle are calculated by the reference point extraction unit 220 (S102), and the reference extracted by the quadratic curve calculation unit 230. A quadratic curve for the point is calculated (S104). Next, the straight line approximation determination unit 240 determines whether or not the quadratic curve approximates a straight line (S106). When it is determined that the quadratic curve approximates a straight line, the left-right determination unit 250 determines whether the display-unnecessary area such as the sea or lake exists on the left or right side of the vehicle position (S108). The display target point determination unit 300 determines the display target point for changing the road map from the two-dimensional display to the bird's-eye view display based on the left and right determination results, and the display mode change unit 310 changes the display mode (S110). , S112).

FIG. 9 is a diagram illustrating a change in the display mode when it is determined that the quadratic curve approximates a straight line. For example, as shown in FIG. 9A, when the own vehicle M travels on the straight road R2 on the left side of the background area 132 such as the sea, the lakeside, and the river, the extracted reference point A (road display boundary point). ), B (road intermediate point), and C (own vehicle position) are also linear, and as a result, it is determined that the quadratic curve approximates a straight line. The left / right determination unit 250 determines that the sea, which is a display unnecessary area, is on the right side with respect to the own vehicle M. Therefore, the display target point determination unit 300 is constant from the right side to the left side with respect to the traveling direction. A display target point that intersects at an angle and has a constant bird's-eye view angle (direction indicated by JJ) is determined. For example, the display target point is determined so that the bird's-eye view angle is 30 ° and the intersecting angle is 45 °. Then, the display mode changing unit 310 changes the display mode to a bird's-eye map display that looks down on such a display target point. FIG. 9B shows a two-dimensional map display, and FIG. 9C shows a state in which the two-dimensional display of FIG. 9B is changed to a three-dimensional display. At this time, the display positions in the X and Y directions on the display unit 130 of the own vehicle M (see FIG. 5A) can be the same as in the two-dimensional display. Further, although not shown here, when it is determined that the display unnecessary area exists on the left side with respect to the own vehicle M, the display is similarly changed to a three-dimensional bird's-eye view display overlooking the right side from the left side of the own vehicle. .. In this way, by changing from the display-unnecessary area 132 to a bird's-eye view display overlooking the land 134, the ratio of the display-free area such as the sea to the whole is reduced as compared with the two-dimensional display. The proportion of the display area on land can be increased. This allows the user to use more information contained in the land 134.

Returning to FIG. 8 again, the process when it is determined that the quadratic curve does not approximate a straight line (S106) will be described. For example, as shown in FIG. 10A, when the own vehicle M travels on the curved road R3, the quadratic curve calculated from the extracted reference points A, B, and C deviates from the straight line. In this case, the tangent line calculation unit 260 calculates the tangent lines for the two reference points A and B (S114), the perpendicular line calculation unit 270 calculates the two perpendicular lines for the two tangent lines (S116), and the perpendicular line intersection calculation unit 280 calculates 2 The intersection of the two perpendiculars is calculated (S118).

Next, the inclusion determination unit 290 determines whether or not the intersection is included in the display unnecessary area (S120). The display target point determination unit 300 determines the display target point based on the determination result of the inclusion determination unit 290 (S122, S124), and the display mode change unit 310 displays the display mode in a bird's-eye view display overlooking the display target point. Change (S126).

For example, in the case of the road R3 as shown in FIG. 10A, since the intersection D of the perpendicular lines H1 and H2 is not included in the display unnecessary area, the display target point determination unit 300 determines the intersection D as the display target point. Then, the display mode changing unit 310 changes the display mode change unit 310 to a bird's-eye view display in which the intersection D is viewed obliquely at a constant angle from the display unnecessary area toward the land (JJ line). FIG. 10B is an example of a two-dimensional display, and FIG. 10C is a display example when FIG. 10B is changed to a bird's-eye view display.
By changing to such a bird's-eye view display, the display area for the entire display unnecessary area 132 is reduced and the display area of the land is increased as compared with the case of the two-dimensional map display, and as a result, the user can use the land. More information is available that is included.

FIG. 11A is an example in which the intersection D of the perpendicular lines is included in the display unnecessary area. As shown in the figure, when the road R4 is curved toward the display-free area such as the sea, the intersection D of the perpendicular lines is included in the display-free area. In this case, the display target point determination unit 300 determines the point d at which the intersection D is axisymmetric with respect to the straight line L5 connecting the points A and B as the display target point. Then, the display mode changing unit 310 changes to a bird's-eye view display overlooking the point d from the display unnecessary area side (JJ line). FIG. 11B is an example of a two-dimensional display, and FIG. 11C is a display example when FIG. 11B is changed to a bird's-eye view display. The bird's-eye view display is, for example, when the display unnecessary area flag of the road on which the own vehicle is traveling becomes "0", or when the display area of the background area determined to be the display unnecessary area becomes less than a certain value. Alternatively, it can be terminated when the user instructs it. After the end, the road map will be the original two-dimensional display.

As described above, according to the present embodiment, when traveling around the display-unnecessary area where the usefulness of the information is low in the road map display, the display of the display-unnecessary area is reduced to increase the useful information. It can be displayed and the optimum map display can be performed in consideration of the direction of travel. In the above embodiment, the sea is illustrated as an area that does not need to be displayed, but the area is not limited to this, and useful information for users such as forests, lakesides, rivers, etc. is scarce, that is, roads, facilities, landmarks, etc. Information does not exist at all, or even if it does exist, it can be a certain number of regions or less.

Next, a modified example of this embodiment will be described. In the above embodiment, when the quadratic curve does not approximate a straight line, either the intersection D or the line-symmetrical point d of the intersection D is determined as the display target point, but both sides of the own vehicle M are display-unnecessary areas. It is also assumed. In this case, both the intersection D and the point d are included in the display unnecessary area. In the modified example, a map is displayed in consideration of such a situation.

FIG. 12 is a flow showing the operation of the modified example. In the modified example, since the display-unnecessary areas exist on both sides of the own vehicle, the left-right determination unit 250 determines that the display-unnecessary areas exist on both sides of the own vehicle. Then, it is determined whether or not the intersection D of the perpendicular lines is included in the display unnecessary area (S120), and then it is determined whether or not the line-symmetrical point d of the intersection D is further included in the display unnecessary area. (S123). When it is determined that the line-symmetrical point d is included in the display unnecessary area (S123), the display target point determination unit 300 determines the point Z existing substantially linearly in the traveling direction of the own vehicle as the display target point. To do.

FIG. 13 is a diagram illustrating a method of determining a display target point Z according to a modified example. When both sides of the own vehicle M are display unnecessary areas 132, the point Z in the traveling direction of the road R5 is set as the display target point. Preferably, the point Z is a display boundary point with respect to the display unit 130 when the road R5 is extended. In addition to this, the display target point may be the display boundary point Z2 of the road R5 in FIG. 13 (A). The display mode changing unit 310 changes the map display so that the bird's-eye view position is substantially directly behind the vehicle M and the vehicle M is viewed from directly behind. FIG. 13 (A) is an example of a two-dimensional display road map, and FIG. 13 (B) is an example of a bird's-eye view display of FIG. 13 (A). By changing to the bird's-eye view display as shown in FIG. 13B, it is possible to display the road R6 existing ahead of the road R5, and it is possible to display useful information in the traveling direction of the own vehicle M.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and modifications are made within the scope of the gist of the invention described in the claims. It can be changed.

10: In-vehicle device 100: Input unit 110: Position information calculation unit 120: Navigation unit 130: Display unit 140: Audio output unit 150: Communication unit 160: Storage unit 162: Map data 164: Link data 166: Node data 168: Facility Data 169: Background data 170: Control unit M: Own vehicle R1 to R6: Roads L1, L2: Tangents H1, H2: Perpendicular lines A, B, C: Reference points D: Intersection points d: Line symmetric points

Claims (7)

An electronic device with a map display function
Display means to display the road map around the vehicle position and
A first determination means for determining whether or not a background area included in a road map displayed by the display means and including the sea, forests, lakesides, or rivers corresponds to a display-unnecessary area. When,
A second determination means for determining whether or not the road on which the vehicle travels is straight, and
When it is determined by the second determination means that the road is not straight, the third determination means for determining whether or not the center of curvature representing the curvature of the road on which the own vehicle travels is included in the display unnecessary area. When,
Including a display control means that controls the display means based on the determination results of the first , second, and third determination means.
When the first determination means determines that the background area corresponds to a display-unnecessary area and the second determination means determines that the road is linear , the display control means displays the road map. Change from a flat display to a bird's-eye view view from the side where the display unnecessary area exists.
Further, in the display control means, the first determination means determines that the background area corresponds to the display unnecessary area, and the third determination means determines that the center of curvature is not included in the display unnecessary area. In this case, when the road map is changed from the flat surface display to the bird's-eye view display overlooking the curvature center from the display unnecessary area side and it is determined that the curvature center is included in the display unnecessary area, the curvature center is changed to the road. An electronic device that moves the road map to a point that is line-symmetrical with the straight line, and changes the road map from a planar display to a bird's-eye view display that looks down on the line-symmetrical point from the display unnecessary area side . When it is determined that the center of curvature and the line-symmetrical point are included in the display-unnecessary areas existing on both the left and right sides of the road, the display control means overlooks the traveling direction of the own vehicle. The electronic device according to claim 1 . The center of curvature, as a reference point a plurality of points on the road in the traveling direction of the vehicle the vehicle position as a starting point is determined from a quadratic curve that passes through or approximates the reference point, electrons according to claim 1 apparatus. The electronic device according to claim 1, wherein the first determination means determines that the background area is a display-unnecessary area when the background area has a certain display area or more. The electronic device according to claim 1, wherein the background area is an area that does not include facilities, landmarks, or roads. An electronic device including a display means for displaying a road map around the position of the own vehicle and a control means for controlling the display means, and a map display program executed by the control means.
A first determination step for determining whether or not a background area included in the road map and including the sea, forests, lakesides, or rivers corresponds to a display-unnecessary area.
The second determination step of determining whether or not the road on which the own vehicle travels is straight, and
When it is determined by the second determination step that the road is not straight, the third determination step of determining whether or not the center of curvature representing the curvature of the road on which the own vehicle travels is included in the display unnecessary area. When,
Including a control step that controls the display means based on the determination results of the first, second, and third determination steps.
In the control step, when the background area is determined to correspond to the display unnecessary area by the first determination step and the road is determined to be linear by the second determination step, the road map is flattened. The display is changed to a bird's-eye view display looking down from the side where the display unnecessary area exists, the background area is determined to correspond to the display unnecessary area by the first determination step, and the curvature center is determined by the third determination step. When it is determined that the road map is not included in the display-free area, the road map is changed from the flat surface display to a bird's-eye view display overlooking the curvature center from the display-free area side, and the curvature center is included in the display-free area. When it is determined, the center of curvature is moved to a point that is line-symmetric with the straight line with respect to the road, and the road map is changed from the plane display to the bird's-eye view display overlooking the point that is line-symmetric from the display unnecessary area side. Map display program. A map display method in an electronic device including a display means for displaying a road map around the position of the own vehicle and a control means for controlling the display means.
A first determination step for determining whether or not a background area included in the road map and including the sea, forests, lakesides, or rivers corresponds to a display-unnecessary area.
The second determination step of determining whether or not the road on which the own vehicle travels is straight, and
When it is determined by the second determination step that the road is not straight, the third determination step of determining whether or not the center of curvature representing the curvature of the road on which the own vehicle travels is included in the display unnecessary area. When,
Including a control step that controls the display means based on the determination results of the first, second, and third determination steps.
In the control step, when the background area is determined to correspond to the display unnecessary area by the first determination step and the road is determined to be linear by the second determination step, the road map is flattened. The display is changed to a bird's-eye view display looking down from the side where the display unnecessary area exists, the background area is determined to correspond to the display unnecessary area by the first determination step, and the curvature center is determined by the third determination step. When it is determined that the road map is not included in the display-free area, the road map is changed from the flat surface display to a bird's-eye view display overlooking the curvature center from the display-free area side, and the curvature center is included in the display-free area. When it is determined, the center of curvature is moved to a point that is line-symmetric with the straight line with respect to the road, and the road map is changed from the plane display to the bird's-eye view display overlooking the point that is line-symmetric from the display unnecessary area side. Map display method.

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