JP4575066B2 - Map display device, in-vehicle navigation device - Google Patents

Description

  The present invention relates to a technique for displaying a road map in a simplified manner.

  A method of simplifying an original map based on map data for representing a map is known. For example, the apparatus disclosed in Patent Document 1 performs processing such as linearization and orthogonalization on the road shape in the map data, and further displays only landmark information within the range defined by the mask, Simplify the original map. By displaying the map simplified in this way, an easy-to-read map is provided.

JP-A-11-202762

  If a map simplified by the method disclosed in Patent Document 1 is used, the rough shape of the map, such as the overall image of the recommended route to the destination, can be displayed in an easy-to-see manner. However, for important points on the recommended route, there is a case where it is desired to know not only a rough shape but also an accurate road shape. Therefore, there is a demand for a map display method capable of displaying an accurate road shape for a part of the map while displaying the map in a simplified manner.

The map display device according to the first aspect of the present invention provides a summary map creating means for creating a summary map summarizing a map based on map data, and a summary map display for displaying the summary map created by the summary map creating means on a display monitor. Means, a display target point setting means for setting a plurality of display target points on the summary map, a selection means for sequentially selecting a plurality of display target points set by the display target point setting means for every predetermined time, and a selection means A designation means for designating a portion of a predetermined range around the display target point selected in the summary map, and for the portion designated by the designation means, a map more detailed than the summary map is displayed instead of the summary map. and a detailed map display means, the abridged map, contains a recommended route to a destination set from the starting point, the display target point setting means, the operation Yoo to increase the displayed point If the user performs an operation to set all of the guidance intersection corresponding points that correspond to the guidance intersection where the vehicle should bend on the recommended route as the display target points and reduce the number of display target points. By setting the points that satisfy the predetermined condition among the guidance intersection corresponding points as the display target points, a plurality of display target points on the recommended route are sequentially set from the departure point to the destination in accordance with the user's operation. The selection means sequentially selects a plurality of display target points according to the order .
According to a second aspect of the invention, in the map display device according to claim 1, the predetermined condition may be any angle that recommended route bends in the road type, or derived intersection corresponding points of the road intersecting the recommended route in the induction intersection corresponding points It is determined based on at least one of them.
According to a third aspect of the present invention, in the map display device of the first or second aspect , the detailed map display means displays the map before the summary as a map that is more detailed than the summary map.
A fourth aspect of the present invention is the map display device according to any one of the first to third aspects, further comprising a scale changing means for changing the scale of the map displayed by the detailed map display means.
An on- vehicle navigation device according to a fifth aspect of the present invention provides a map display device according to any one of the first to fourth aspects, own vehicle position detecting means for detecting the current location of the own vehicle, and the current location detected by the own vehicle position detecting means. As a departure point, route search means for searching for a recommended route from the departure point to the set destination is provided.

  According to the present invention, any part is designated from the summary map displayed on the display monitor, and the map is displayed in more detail than the summary map instead of the summary map. Since it did in this way, while displaying the summary map which simplified the map, the exact road shape can be displayed using the detailed map about a part of them.

-First embodiment-
A configuration of a navigation apparatus according to an embodiment of the present invention is shown in FIG. This navigation device is mounted on a vehicle, and by searching for a recommended route to a set destination, a road map of the recommended route is displayed and the host vehicle is guided to the destination according to the recommended route. When a recommended route is searched, a map that summarizes the normal map (hereinafter referred to as a summary map) is created by simplifying the road shape etc. based on the normal map for the entire recommended route. A summary map for the entire recommended route is displayed. The navigation device 1 shown in FIG. 1 includes a control circuit 11, a ROM 12, a RAM 13, a current location detection device 14, an image memory 15, a display monitor 16, an input device 17, and a disk drive 18. The disc drive 18 is loaded with a DVD-ROM 19 in which map data is recorded.

  The control circuit 11 includes a microprocessor and its peripheral circuits, and performs various processes and controls by executing a control program stored in the ROM 12 using the RAM 13 as a work area. By executing processing as will be described later in the control circuit 11, a recommended route is searched based on the map data recorded in the DVD-ROM 19, and a summary map for the entire recommended route is created and displayed. It is displayed on the monitor 16.

  The current location detection device 14 is a device that detects the current location of the host vehicle. For example, a vibration gyro 14a that detects the traveling direction of the host vehicle, a vehicle speed sensor 14b that detects a vehicle speed, and a GPS sensor that detects a GPS signal from a GPS satellite. 14c and the like. The navigation device 1 can determine a route search start point when searching for a recommended route based on the current location of the host vehicle detected by the current location detection device 14, and can display the position of the host vehicle on a map. .

  The image memory 15 temporarily stores image data to be displayed on the display monitor 16. The image data includes road map drawing data for displaying a map image, various graphic data, and the like, and is created by the control circuit 11 based on the map data recorded on the DVD-ROM 19. Using the image data stored in the image memory 15, either a summary map of the entire recommended route or a normal map is displayed on the display monitor 16.

  The input device 17 has various input switches for the user to set a destination and the like, which is realized by an operation panel, a remote controller, or the like. The user operates the input device 17 according to a screen instruction displayed on the display monitor 16 to set a destination by specifying a place name or a position on a map, and starts searching for a recommended route to the destination. be able to.

  The disk drive 18 reads map data used for displaying a normal road map or creating a summary map from the loaded DVD-ROM 19. This map data includes route calculation data used to calculate the recommended route to the destination, route guidance data used to guide the vehicle to the destination according to the recommended route, such as an intersection name and a road name, It includes road data representing roads, background data representing map shapes other than roads, such as rivers, railways, and various facilities (landmarks) on maps.

  In the road data, the minimum unit representing a road section is called a link, and each road is composed of a plurality of links. A point connecting the links is called a node, and each node has position information (coordinate information). The link shape, that is, the shape of the road is determined based on the position information of the node. A summary map of recommended routes is created by performing deformation processing as described later on such road data. Although an example using a DVD-ROM is described here, the map data may be read from a recording medium other than the DVD-ROM, such as a CD-ROM or a hard disk.

  When the destination is set by the user as described above, the navigation device 1 uses the current location detected by the current location detection device 14 as a route search start point, and calculates a route to the destination based on the above-described route calculation data. And a predetermined algorithm. When the recommended route to the destination is obtained in this way, a summary map for the entire recommended route is created, and a summary map screen as shown in FIG. 2 is displayed on the display monitor 16.

  The recommended route 20 displayed on the summary map screen of FIG. 2 is displayed by summarizing the entire searched recommended route, so that the road shape is simplified than the actual one. A specific summarization method at this time will be described later. A departure point mark 21 is displayed at the departure point of the recommended route 20 (route search start point), and a destination point mark 22 is displayed at the destination. A magnifying glass mark 30, a pause button 31, a play button 32, a stop button 33, and a magnification change button 34 described below are also displayed on this summary map screen.

  The magnifying glass mark 30 designates any part of the summarized recommended route 20. For the specified part, the map before summarizing is displayed instead of the summary map. Specifically, as shown in FIG. 2, for the range included inside the magnifying glass mark 30, the original map before the summary is displayed instead of the summary map. The magnifying glass mark 30 automatically moves on a plurality of display target points set on the recommended route 20 in order from the departure point to the destination at predetermined time intervals. That is, a plurality of display target points set in order from the departure point to the destination are sequentially selected every predetermined time according to the order. Then, by moving the magnifying glass mark 30 on the selected display target point, the original map before summarization is displayed for a portion in a predetermined range around the display target point.

  The display target points are set on the recommended route 20 as follows. For example, on the summary map screen, the recommended route 20 is bent and the shape is changed (hereinafter referred to as a shape change point), or the point corresponding to the guidance intersection in the original recommended route before the summary (hereinafter referred to as the guidance intersection corresponding point). Can be set as display target points. In addition, the guidance intersection here means the intersection which should turn when the own vehicle drive | works a recommended route. The shape change point is also usually a guidance intersection corresponding point.

  Furthermore, it may be determined by the user's operation to increase or decrease the number of display target points, and the setting conditions of the display target points may be changed according to the operation. For example, when it is operated to increase the number of display target points, all of the guidance intersection corresponding points are set as display target points, and when it is operated to decrease the reverse, only the shape change points are set. Set the display target point. When these intermediate points are designated by the user's operation, a point that satisfies a predetermined condition among the guidance intersection corresponding points may be set as a display target point. For example, the guidance intersection corresponding to the guidance intersection where the road type of the road that intersects the recommended route is specific (national road, prefectural road, etc.) or the guidance intersection where the recommended route is bent at a certain angle or more, It can be set as a display target point. In this way, the setting conditions for setting the display target point can be changed according to the user's operation.

  The pause button 31, the play button 32, and the stop button 33 are used for controlling the display of the magnifying glass mark 30, respectively. The user presses the play button 32 by operating the input device 17 to display the magnifying glass mark 30 on the summary map screen of FIG. 2 and start around each display target point set on the recommended route 20. The original map before the summary can be displayed in order from the ground. Further, when the pause button 31 is pressed after the playback button 32 is pressed, the movement of the magnifying glass mark 30 between the display target points is paused. At this time, when the pause button 31 is pressed again, the movement of the magnifying glass mark 30 can be resumed. Furthermore, when the stop button 33 is pressed, even if the magnifying glass mark 30 has not moved to the destination, the display of the summary map screen of FIG. 2 is stopped.

  When the magnification change button 34 is used, the scale of the map before the summary displayed in the magnifying glass mark 30 can be changed. The user presses any part of “× 1”, “× 2”, “× 4”, or “× 8” arranged on the magnification change button 34 by operating the input device 17 to display the magnification. The map scale of the original summary map can be switched in accordance with and the map can be enlarged or reduced. When the map scale is changed, the range of the displayed map changes according to the map display portion in the magnifying glass mark 30. Note that other magnifications may be designated.

  By displaying the summary map screen as described above, the entire map of the recommended route and the original pre-summary map around each display target point are displayed. Thereafter, a normal map is displayed around the vehicle position. On this map, the recommended route is displayed separately from other roads by changing its display form, for example, display color, and a vehicle position mark indicating the vehicle position is displayed. Thereby, the user can recognize the recommended route and the vehicle position on the map. In addition, the user is instructed to travel in the direction of the image or voice so that the vehicle can travel according to the recommended route. In this way, the guidance of the host vehicle is performed up to the destination.

  FIG. 3 shows a flowchart of processing executed in the control circuit 11 when the above summary map screen is displayed. This flowchart is executed when the destination is input by the user. In step S1, the route search destination is set according to the destination input by the user. In step S2, a recommended route from the current location of the host vehicle, which is a route search start point, to the destination set in step S1 is searched. At this time, as described above, the route calculation is performed by a predetermined algorithm based on the route calculation data. In addition, the present location of the own vehicle is calculated | required by the present location detection apparatus 14 for every fixed time.

  In step S3, a summary map is created and displayed for the recommended route searched in step S2. As a result, the recommended route 20 of FIG. 2 is displayed on the display monitor 16. The specific processing content of step S3 will be described later with reference to FIG. In step S4, display target points are set on the recommended route 20 displayed in step S3 as described above. In step S5, the buttons shown in FIG. 2, that is, the pause button 31, the play button 32, the stop button 33, and the magnification change button 34 are displayed on the display monitor 16. As a result of the processing in step S5, a summary map screen as shown in FIG. 2 is displayed. At this time, the magnifying glass mark 30 is not displayed yet.

  In step S6, it is determined whether or not the playback button 32 displayed in step S5 has been pressed by the user. If it is pressed, the process proceeds to the next step S7. In step S7, the magnifying glass mark 30 of FIG. 2 is displayed on the recommended route 20 displayed by the process of step S3. At this time, the departure point, that is, the own vehicle position is set as the first display target point, and the magnifying glass mark 30 is displayed on the first display target point. Using the magnifying glass mark 30 displayed by executing this step S7, any one part is designated from the summary map in the subsequent processing. In step S8, a normal map, that is, the original map before summarization, is displayed for a predetermined map range around the display target point inside the magnifying glass mark 30 displayed in step S7.

  In step S9, it is determined whether or not the stop button 33 has been pressed by the user. If pressed, the processing flow of FIG. 3 is terminated and display of the summary map screen is stopped. Thereafter, the display shifts to a normal map display around the vehicle position. If the stop button 33 is not pressed, the process proceeds to the next step S10. In step S10, it is determined whether or not the pause button 31 has been pressed by the user. If it is pressed, the process proceeds to step S11, and does not proceed until the pause button 31 is pressed again. If the pause button 31 is not pressed in step S10, or if the pause button 31 is pressed again in step S11, the process proceeds to step S12.

  In step S12, it is determined whether or not the magnification change button 34 has been pressed by the user. If it has been pressed, the process proceeds to step S13, and the scale of the original map before summarization displayed in the magnifying glass mark 30 is switched according to the pressed magnification. After executing step S13, the process proceeds to step S14. On the other hand, if the magnification change button 34 is not pressed in step S12, the process proceeds to step S14 without executing step S13.

  In step S14, it is determined whether or not a predetermined time has elapsed since the original map before summarization was displayed in the magnifying glass mark 30 in step S8. If a predetermined time, for example, 5 seconds has elapsed since the display, the process proceeds to the next step S15. If the predetermined time has not elapsed, the process returns to step S9 and the above processing is repeated. The predetermined time here is equal to the predetermined time when the magnifying glass mark 30 described above moves sequentially on the display target point.

  In step S15, the next display target point is selected from the plurality of display target points set in step S4. At this time, as described above, the display target points are set in order from the departure point to the destination on the recommended route. The next display target point is selected according to the arranged order. In step S16, the magnifying glass mark 30 is moved to the next display target point selected in step S15. In this way, the magnifying glass mark 30 is moved on the display target point every predetermined time.

  In step S17, it is determined whether or not the magnifying glass mark 30 has moved to the destination as a result of moving the magnifying glass mark 30 to the next display target point in step S16. When moving to the destination, the processing flow of FIG. 3 is terminated and the display of the summary map screen is completed. After that, similarly to the case where the display of the summary map screen is stopped, the display shifts to the normal map display around the vehicle position. On the other hand, if the magnifying glass mark 30 has not moved to the destination, the process returns to step S8 to display a normal map in the magnifying glass mark 30 for the display target point after the movement, and then repeat the above processing.

  As described above, the summary map screen of FIG. 2 is displayed on the display monitor 16, and the original map before summarization is displayed around the display target points set on the recommended route 20 on the summary map screen. be able to.

  Next, the summary map creation / display process executed in step S3 will be described. FIG. 4 is a flowchart showing the contents of the summary map creation / display process. The deformation process in step S110, the leveling process in step S120, the landmark position correction in step S130, the summary map display in step S140, and the process in step S150. It has each step of starting and destination mark display. Below, the contents of each of these steps will be described in order.

  In step S110, the summarized route is created by executing the deformation process (straightening / orthogonalizing process) on the recommended route searched in step S2 of FIG. The specific contents of this deformation process will be described later.

  In step S120, a leveling process is performed on the created summary map. This leveling process refers to rotating the entire summary map around its center to direct the summary map so that the starting point is at the top left of the screen and the destination is at the bottom right of the screen. . The leveling process may be performed as necessary and may be omitted. In addition, the summary map may be directed in other directions.

  In step S130, the landmark position is corrected with respect to the summary map. The details of the landmark position correction will be described later. In step S140, the landmark whose position has been corrected in step S130 is superimposed on the summary map, and the summary map is displayed on the display monitor 16.

  In step S150, the departure point mark 21 and the destination mark 22 of FIG. 2 are displayed on the summary map displayed in step S140. After executing step S150, the process flow of FIG. 4 is terminated, and the process proceeds to step S4 of FIG. As described above, the process of step S3 is executed, and the recommended route 20 of FIG.

  Here, the summary map creation method executed in step S110 of FIG. 4 will be described. The summary map is created by executing a process called deformation process on the set map range based on the map data. The contents of the deformation process will be described below. FIG. 5 and FIG. 6 are detailed explanatory diagrams for explaining the contents of deformation processing used when creating a summary map in the present invention. In FIG. 5, the straightening of the road shape (thinning process of the component points) will be described as the deformation process (1).

  Assuming that the original figure shown in FIG. 5 (a) is the original road shape, on the other hand, as shown in FIG. 5 (b), a line connecting the two end points (referred to as the first end point and the second end point). The perpendicular distance of each point with respect to (broken line) is measured, and the longest perpendicular distance dmax is obtained. Then, if the determined dmax is equal to or larger than a predetermined value ε set in advance, the corresponding constituent point is left. That is, as shown in (c), a point corresponding to the dmax is added as a new end point (referred to as a third end point), and the first end point and the third end point, and the third end point and the second end point are Draw lines that are connected by broken lines. Note that the points or constituent points here are for determining the shape of the road, that is, the link train, and are nodes or shape interpolation points in the road data (points set between the nodes to determine the link shape). It corresponds to.

  In this way, the same processing is repeated until the longest perpendicular distance dmax becomes smaller than ε. Assume that dmax <ε in the state shown in FIG. At this time, a straight line connecting adjacent end points is drawn, and the road shape is represented by the shape of the straight line. As a result, the road shape as shown in (e) is obtained. In this way, the road shape straightening process is performed.

  In FIG. 6, the orthogonalization of the road shape will be described as the deformation process (2). If the figure shown in FIG. 6 (a) is the original road shape, a straight line that passes through the first point (P1) of the first polygonal line and is parallel to the x-axis (the horizontal direction of the map) is obtained. . This straight line is taken as a reference line indicated by a broken line. Next, as shown in (b), for the vector (link) P1P2 connecting the point P1 and the next point P2, the angle θ made with the reference line is obtained.

  Next, as shown in (c), with the vector length fixed, the vector P1P2 is rotated around the starting point P1 so that θ ′ = n · Δθ (n is an integer). Thereby, the end point P2 is moved. The angle Δθ is a unit angle when the vector P1P2 is rotated, and is set to 45 °, for example. By this process, the angle formed by the vector P1P2 and the reference line is corrected in increments of unit angle Δθ.

  Next, as shown in (d), the amount of movement (dx, dy) of the point P2 is sequentially propagated to the next point of the point P2. In the case of an intersection, it is branched and propagated. As a result, the positions of the other points move one after another.

  Thereafter, the same processing as described above is repeated. That is, as shown in (e), a straight line passing through the point P2 and parallel to the x-axis is used as a reference line, and an angle θ formed by the next vector P2P3 and the reference line is obtained. Then, as shown in (f), the vector P2P3 is rotated around the start point P2 so that θ ′ = n · Δθ, and the end point P3 is moved. Thereafter, as shown in (g), the amount of movement (dx, dy) that the point P3 has moved is propagated to the next point of P3. In the case of an intersection, it is branched and propagated.

  By sequentially performing such processing on all points, a road shape as shown in (h) is finally obtained. In this way, the road shape is orthogonalized. As described above, the deformation process is completed by performing the straightening and orthogonalizing process of the road shape. By performing this deformation process on the set map range, a summary map can be created.

  On the summary map created as described above, landmarks indicating the positions of various facilities and the like are displayed as in the original map before the deformation process. However, as the road shape is simplified by the deformation process, the position of the road in the summary map changes from the original map. Therefore, if the landmark is displayed on the summary map with the original position, the positional relationship between the road and the landmark cannot be represented correctly. Therefore, it is necessary to correct the position of the landmark after performing the deformation process. The method will be described below.

  In FIG. 7, the outline of the landmark position correction executed in step S130 will be described. As shown in FIG. 7A, the map before the deformation process describes a delicate positional relationship between the landmark position and the road. When the deformation process as described above is performed on the original map, and the landmark position is displayed as it is, a summary map as shown in FIG.

  In the summary map shown in (b), only the position of the road is changed with respect to the original map shown in (a), so the positional relationship between the original landmark and the road is not maintained. For example, paying attention to a post office near the center of the map, the post office is located on the opposite side of the road in the original map shown in (a) and the summary map shown in (b). Therefore, in order to correct such inconvenience, the position of the landmark is corrected. As a result, as shown in the summary map shown in (c), the positional relationship between the road and the landmark is the position on the original map. Try to approximate the relationship.

  Next, a detailed algorithm for landmark position correction will be described with reference to FIG. In the landmark position correction, as shown in FIG. 8A, a pair list between shape vectors before and after summarization is first created. Here, by performing the deformation process as described above at the time of summarization, the number of constituent points of the shape vector representing the shape of the road changes from the original one. Therefore, when creating a pair list, the directionality between the branch points between the shape vectors related in the pair list must match. That is, a one-to-one correspondence relationship is established for each branch point before and after the deformation process.

  After the pair list is created in this way, as shown in (b), correction processing for equalizing the norm of each shape vector and the distance between the corresponding branch points is performed. That is, in the original map before summarization, the norm value of the shape vector closest to the landmark and the ratio of the distance from the landmark to each branch point in the road route including the shape vector are measured. With this measured value, even in the summary map after deformation processing, the norm value and the ratio of the distance from the landmark to the branch point are equivalent to the shape vector associated with the pair list. , Calculate landmark position. Then, a landmark is displayed at the calculated position.

  In the landmark position correction described above, the shape and distance of the road changes by converting a normal map into a summary map by deformation processing, so the corresponding landmarks (shops along the road, etc.) also match the road. The coordinates need to be converted. Therefore, as a parameter for the position of the landmark before conversion, what percentage of the whole landmark is from one end of the road (link) before conversion, which side of the road, Find how many meters away. Then, with respect to the corresponding road data after conversion, the position of the landmark after conversion is determined using these three parameters. This will be described using a specific example shown in FIG.

FIG. 9A shows an example of a landmark position on a normal map before the deformation process. Roads connecting the points A and B, the link 51 between points A and _{A 1,} point _{A 1} and the link 52 between the _{A 2,} the link 53 between the point _{A 2} and _{A 3,} and the point _{A 3} , B, and a landmark 61 exists along the road. The length of each of the links 51 to 54 is 150 m, 200 m, 350 m, and 500 m, and the road connecting the points A and B constituted by these links has a total length, that is, 1200 m. . The landmark 61 is located 200 m from the point A3 toward the point B, that is, at a point 900 m from the point A, on the left side of the road. The location of the landmark 61 is 10 m away from the road.

  For the landmark position before such deformation processing, the three parameters described above are obtained. The ratio of the first parameter, that is, the distance from one end (point A) of the road to the total distance is obtained as 900/1200 = 0.75 (75%). The second parameter, that is, which side of the road is located, is determined to be on the left side of the road from point A to point B. The third parameter, that is, the distance from the road is obtained as 10 m.

  FIG. 9B shows an example of landmark positions on the summary map after the deformation process is executed. In this summary map, the road connecting the point A and the point B is represented by one link 55, and its length is 1000 m. When the landmark 61 is displayed on this summary map, the converted position is determined using the three parameters obtained previously. That is, the distance from the point A is obtained as 1000 × 0.75 = 750 m using the first parameter. The second parameter and the third parameter determine the position on the left side of the road (link 55) viewed from the point A and 10 m away from the road. By displaying the landmark 61 at a position that satisfies these conditions, the position of the landmark 61 is corrected.

  By performing the processing described above, the position of the landmark is corrected in the summary map, and the positional relationship between the road and the landmark can be approximated to the original map before the summary. As a result, the landmark position in the summary map can be made as shown in FIG. 7C with respect to the landmark position of the original map shown in FIG. A landmark map is created by representing landmark positions on the deformed map.

According to the first embodiment described above, the following operational effects can be obtained.
(1) A summary map of the searched recommended route is created and displayed on the display monitor 16 (step S3), and the magnifying glass mark 30 is displayed (step S7). Specify the part. For the designated portion, the original map before the summary is displayed instead of the summary map (step S8). Since it did in this way, while displaying the summary map which simplified the map, the map before a detailed summary can be displayed about one part, and an exact road shape can be displayed.

(2) A plurality of display target points are set on the summary map (step 4). When a predetermined time elapses after executing step S8 (step S14), the next display target point is selected (step S15), and the magnifying glass mark 30 is moved onto the selected display target point (step S16). . As a result, a plurality of display target points are sequentially selected every predetermined time, and a predetermined range portion around the points is designated from the summary map. Since it did in this way, the original map before the summary can be displayed for every predetermined time about a some part.

(3) On the recommended route included in the summary map, a plurality of display target points are set in order from the starting point to the destination, and the plurality of display target points are sequentially selected according to the order. Since it did in this way, the map before the summary from the origin to the destination can be sequentially displayed along the recommended route.

(4) Since the shape change point and the guidance intersection corresponding point on the recommended route in the summary map are set as the display target points, an accurate road shape is required when the host vehicle actually travels the recommended route. The map before the original summary can be displayed around the area.

(5) When the magnification change button 34 is pressed by the user (step S12), the scale of the map before the summary displayed in the magnifying glass mark 30 is changed (step S13). Since it did in this way, the user can change the map scale before the original summary arbitrarily.

-Second Embodiment-
A second embodiment of the present invention will be described. Unlike the first embodiment, this embodiment does not display a summary map for all routes from the departure point to the destination. In this embodiment, when the vehicle is guided to the destination according to the recommended route, a summary map up to the next guidance intersection is displayed. In this summary map, the original pre-summary map can be displayed for an arbitrary portion selected by the user using the magnifying glass mark described in the first embodiment. The configuration of the navigation device according to this embodiment is the same as that of the first embodiment shown in FIG.

  An example of the summary map screen displayed on the display monitor 16 in the present embodiment is shown in FIG. Each of the summary map screens shown in FIGS. 10A and 10B is a summary of the searched recommended routes for the range including the next guidance intersection from the vehicle position. In this figure, the road indicated by the bold line represents the recommended route. On these summary map screens, a vehicle position mark 40 for indicating the vehicle position is displayed.

  First, the summary map screen before displaying the magnifying glass mark of (a) is displayed. On this screen, a magnifying glass icon 41 for switching the display of the magnifying glass mark is displayed. When the user presses the magnifying glass icon 41 by operating the input device 17, the screen is switched to the summary map screen after displaying the magnifying glass mark in (b). On this screen, the magnifying glass mark 30 described in the first embodiment is displayed. Further, the magnifying glass icon 41 is highlighted to indicate that it is a summary map screen after the magnifying glass mark is displayed.

  On the screen (b), the user can move the magnifying glass mark 30 to an arbitrary position by performing a direction input operation using the input device 17. Thereby, the original map before the summary can be displayed for any part selected from the summary map. Further, when the magnifying glass icon 41 highlighted on the screen of (b) is pressed again, the screen returns to the screen of (a) again. In this way, the screens (a) and (b) can be switched, and the display of the magnifying glass mark 30 can be turned on and off.

  FIG. 11 shows a flowchart of processing executed when the summary map screen is displayed in the present embodiment. In FIG. 11, processing steps having the same contents as those in the processing flow of the first embodiment shown in FIG. 3 have the same step numbers. In the following description, the description of the same step number is omitted unless particularly necessary.

  In step S3, the summary map of the recommended route is displayed by performing the above-described summary map creation / display process. At this time, unlike the first embodiment, the summary map creation range is determined so as to include the vehicle position and the next guidance intersection. In the next step S5A, the vehicle position mark 40 of FIG. 10 and the magnifying glass icon 41 are displayed on the summary map displayed in step S3. Thereby, the summary map screen before the display of the magnifying glass mark in FIG. 10A is displayed on the display monitor 16. Note that the setting of the display target point executed in step S4 in FIG. 3 is not executed because it is unnecessary in this embodiment.

  In step S6A, it is determined whether or not the magnifying glass icon 41 displayed in step S5A has been pressed by the user. If pressed, the magnifying glass icon 41 is highlighted and then steps S7 and S8 are executed to display the magnifying glass mark 30, and a normal map, that is, the original map before the summarization is displayed inside it. Is displayed. Accordingly, the summary map screen before the magnifying glass mark display of (a) is switched to, and the summary map screen after the magnifying glass mark display of (b) is displayed on the display monitor 16.

  In step S <b> 9 </ b> A, it is determined whether or not any direction input is performed by an operation of the input device 17 from the user. If any direction is input, the process proceeds to step S9B, and the magnifying glass mark 30 is moved according to the input direction. After the execution of step S9B, the process returns to step S8. After the map display in the magnifying glass mark 30 is updated according to the position of the moved magnifying glass mark 30 in step S8, the above process is repeated. On the other hand, if there is no direction input in step S9A, the process proceeds to step S11A.

  In step S11A, it is determined whether or not the magnifying glass icon 41 pressed by the user has been pressed again. If the button is pressed, the reverse display is canceled to return to the normal display, and the process proceeds to step S11B. In step S11B, the magnifying glass mark 30 displayed in step S7 is erased from the screen. Thereby, it is switched again to the summary map screen before the magnifying glass mark display of (a). If step S11B is performed, it will return to step S6A and repeat said process.

  In the above description, the summary map displayed in step S3 has a predetermined update condition, for example, when the host vehicle reaches a guidance intersection, or the host vehicle position is out of the range of the summary map. In some cases, the display content is updated.

  As described above, the summary map screen of FIG. 10 is displayed on the display monitor 16, and the original map before the summary can be displayed around any point selected by the user on the summary map screen.

  According to the second embodiment described above, similar to the first embodiment, a summary map is created and displayed on the display monitor 16, the magnifying glass mark 30 is displayed, and the magnifying glass mark 30 is displayed. For the part specified from the summary map, the original map before the summary is displayed instead of the summary map. Since it did in this way, like the 1st embodiment, while displaying the summary map which simplified the map, the original map before the summary is displayed about a part, and the exact road shape is displayed. be able to.

  In each of the above-described embodiments, the magnifying glass mark 30 designates a part of the summary map within a predetermined range, and an example of displaying the original map before the summary for the part has been described. Not as long. For example, the original pre-summary map may be displayed for a range specified by the user in an arbitrary size on the summary map. Further, the original map before summarization may be displayed there by dividing the screen or displaying another window.

  Further, in each of the above embodiments, the map displayed in the magnifying glass mark 30 may not be the original map before the summary. Any map may be used as long as the map is more detailed than the summary map displayed when it is outside the magnifying glass mark 30.

  In each of the embodiments described above, an example has been described in which the navigation device reads map data from a storage medium such as a DVD-ROM to create a summary map, but the present invention is not limited to this content. For example, the present invention can be applied to a communication navigation apparatus that downloads map data from an information distribution center using wireless communication using a mobile phone or the like.

  The present invention is not limited to the above embodiment. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

It is a block diagram which shows the structure of the navigation apparatus by one Embodiment of this invention. It is a figure which shows the example of the summary map screen displayed in 1st Embodiment. It is a flowchart of the process performed when displaying a summary map screen in 1st Embodiment. It is a flowchart which shows the content of the subroutine process performed in a summary map preparation / display process. It is explanatory drawing of the deformation | transformation process (1) utilized when producing a summary map. It is explanatory drawing of a deformation process (2) similarly. It is explanatory drawing of the outline | summary of the position correction of a landmark. It is explanatory drawing of the detailed algorithm of the position correction of a landmark. It is a figure which shows the specific example of the position correction of a landmark. It is a figure which shows the example of the summary map screen displayed in 2nd Embodiment. It is a flowchart of the process performed when displaying a summary map screen in 1st Embodiment.

Explanation of symbols

1 Navigation device 11 Control circuit 12 ROM
13 RAM
14 Current location detection device 15 Image memory 16 Display monitor 17 Input device 18 Disk drive 19 DVD-ROM
20 Recommended route 30 Magnifying glass mark

Claims (5)

Summary map creation means for creating a summary map summarizing the map based on the map data;
Summary map display means for displaying the summary map created by the summary map creation means on a display monitor;
Display target point setting means for setting a plurality of display target points on the summary map;
Selection means for sequentially selecting a plurality of display target points set by the display target point setting means at predetermined time intervals;
Designation means for designating a portion of a predetermined range around the display target point selected by the selection means in the summary map;
For the part designated by the designation means, a detailed map display means for displaying a map more detailed than the summary map instead of the summary map,
The summary map includes a recommended route from the starting point to the set destination,
When the operation for increasing the number of display target points is performed by the user, the display target point setting unit displays all of the guidance intersection corresponding points corresponding to the guidance intersection where the vehicle should bend on the recommended route. If the user performs an operation to reduce the number of display target points, the point corresponding to a predetermined condition among the guidance intersection corresponding points is set as the display target point. A plurality of display target points are arranged in order from the starting point to the destination with a set number corresponding to the user's operation,
The map display device , wherein the selection means sequentially selects the plurality of display target points according to the order . The map display device according to claim 1 ,
Wherein the predetermined condition, wherein said recommended route and road type of a road crossing, or the induction to the intersection corresponding point is determined based on at least one of the angle which the recommended route is bent in the induction intersection corresponding point A map display device. The map display device according to claim 1 or 2 ,
The detailed map display means displays a map before summarization as a more detailed map than the summary map. In the map display apparatus in any one of Claims 1-3 ,
A map display device further comprising a scale changing means for changing a scale of the map displayed by the detailed map display means. A map display device according to any one of claims 1 to 4 ,
Own vehicle position detecting means for detecting the current location of the own vehicle;
An in-vehicle navigation device comprising: a route search unit that searches for a recommended route from the current location detected by the vehicle position detection unit to a set destination from the current location.

Images