JP4986156B2 - Navigation device - Google Patents

Description

  The present invention relates to a navigation apparatus that searches a guidance route to a destination and guides a guidance target.

  The navigation device detects the position and direction of the vehicle by GPS or the like. Then, map data corresponding to the position of the vehicle is read from a map data recording medium such as a hard disk, a CD-ROM, a DVD-ROM or the like on which a large amount of map data is recorded, and a map around the vehicle position is based on this map data. The image is displayed on the display device, the vehicle position mark is superimposed and displayed, and further, the map image is scrolled according to the movement of the vehicle so that the user can grasp the position of the vehicle. It has become.

  In addition, the navigation device has a route guidance function that allows the user to easily travel to the destination without making a mistake on the road. In this route guidance function, a guidance route having the lowest link cost from the starting point to the destination is searched using map data, and the searched route is stored as a guidance route. While the vehicle is running, the guidance route is drawn thickly on the map image with a different color from other roads, or the vehicle approaches within a predetermined distance from the intersection where the route on the guidance route should be changed. Sometimes, the vehicle is guided to the destination by displaying an arrow indicating a course at an intersection where the route on the map image should be changed.

Further, the navigation device scrolls the map image and always displays the map image around the current vehicle position, so that the user can check the current vehicle position on the map and follow the guidance route. There are some that enable appropriate traveling (see, for example, Patent Document 1).
JP 2004-317289 A

  In the conventional navigation device described above, when a map image including a guidance route is displayed, if the scale is enlarged, the enlarged map image is centered on the center of the region corresponding to the map image before enlargement. It will be a thing. In this case, for example, as shown in FIG. 14A, if the center 301 of the area corresponding to the map image before enlargement and the guide route 310 connecting the starting point 311 and the destination 312 are separated, As shown in FIG. 14B, the guide route 310 may disappear from the enlarged map image. Further, in the conventional navigation device described above, the guidance route originally included in the map image may disappear by scrolling the map image. For this reason, the user cannot grasp the guidance route. Further, in order to grasp the guide route, the user needs to search for the guide route by scrolling, which is complicated.

  An object of the present invention is to solve the above-described problems and to provide a navigation device that displays a map image that makes it easy to grasp a guidance route.

According to the present invention, a navigation device for guiding a guidance target by searching for a guidance route to a destination, guidance route information acquisition means for acquiring information on the guidance route, map data acquisition means for acquiring map data, Based on the guide route information acquired by the guide route information acquisition unit and the map data acquired by the map data acquisition unit, a map image of the first area including the guide route is displayed on the display unit. Information on the guidance route acquired by the guidance route information acquisition means when an instruction to enlarge the scale of the map image is given during display of the map image of the first area; Based on the map data acquired by the map data acquisition means, a map image of the second area including the guidance route and having a scale larger than that of the map image of the first area is obtained. A second display processing unit to be displayed on the display unit, wherein the information on the guidance route includes position information on the guidance route, and the second display processing unit includes: Displaying a map image of the second area centered on a position closest to the center of the first area, and based on position information of the guidance route, A shortest position specifying unit that specifies a position on the guide route that has the shortest distance is displayed, and a map image of the second area centered on the position on the guide route specified by the shortest position specifying unit is displayed. It is characterized by making it.

According to this configuration, when the scale of the map image of the first region including the guidance route is enlarged, the guide route can be included in the map image of the second region after the scale enlargement, and the user can The guide route can be easily grasped. Furthermore, since the map image of the second region after the scale enlargement includes the guide route at the center, the user can easily grasp the guide route.

According to the present invention, a navigation device for guiding a guidance target by searching for a guidance route to a destination, guidance route information acquisition means for acquiring information on the guidance route, map data acquisition means for acquiring map data, Based on the guide route information acquired by the guide route information acquisition unit and the map data acquired by the map data acquisition unit, a map image including the guide route is displayed on the display unit while scrolling. Whether or not the guidance route has disappeared from the map image displayed on the display unit based on the information on the guidance route acquired by the display processing means and the guidance route information acquisition means. There is a possibility that the guidance route disappears from the map image or disappears by the disappearance determining means for determining whether or not there is, and the disappearance determining means. When it is determined that, based on the guidance route information acquired by the guidance route information acquisition means, an image indicating the direction of the guidance route with respect to the region corresponding to the map image is superimposed on the map image, and A second display processing means for displaying on the display unit, wherein the information on the guide route includes position information on the guide route, and the second display processing means includes: An image indicating the direction of the closest position from the center of the area corresponding to the map image is displayed, and the distance from the center of the area corresponding to the map image is the shortest based on the position information of the guide route And shortest position specifying means for specifying the position on the guide route, and displaying an image indicating the direction of the position on the guide route specified by the shortest position specifying means.

  According to this configuration, when the guidance route disappears from the map image due to the scroll display or the possibility of disappearance is high, an image indicating the direction of the guidance route is displayed over the map image. Can easily grasp the direction of the guide route.

  In addition, the navigation device according to the present invention performs the scrolling before the guidance route disappears from the map image displayed on the display unit based on the guidance route information acquired by the guidance route information acquisition unit. You may make it have the scroll pause means to pause.

  According to this configuration, before the guide route disappears from the map image, by temporarily stopping scrolling, it is possible to prevent the user from scrolling more than intended and disappear from the map image from the guide route. Can do.

According to the present invention, a navigation device for guiding a guidance target by searching for a guidance route to a destination, guidance route information acquisition means for acquiring information on the guidance route, map data acquisition means for acquiring map data, A display unit that scrolls the map image of the first area including the guide route based on the guide route information acquired by the guide route information acquisition unit and the map data acquired by the map data acquisition unit. Whether or not the guidance route has disappeared from the map image displayed on the display unit based on the first display processing means to be displayed and the guidance route information acquired by the guidance route information acquisition means, or The disappearance determination means for determining whether or not there is a possibility of disappearance, and the guide route has disappeared from the map image by the disappearance determination means, or disappearance If it is determined that there is a possibility, the scale including the guide route is reduced based on the guide route information acquired by the guide route information acquisition unit, and the scale is reduced more than the map image of the first region. Second display processing means for displaying a map image of the second area on a display unit, wherein the guide route information includes position information of the guide route, and the second display processing means includes: A map image of the second area including the position closest to the center of the first area among the positions on the guidance path is displayed, and based on the position information of the guidance path, the first The second region including a shortest position specifying unit that specifies a position on the guide route that has the shortest distance from the center of one region, and includes a position on the guide route specified by the shortest position specifying unit. To display a map image of And features.

  According to this configuration, when the guidance route disappears from the map image due to the scroll display or the possibility of disappearance is high, the scale can be reduced to include the guidance route in the map image. The guide route can be easily grasped.

  From the same point of view, the navigation device according to the present invention provides a map of the second area, wherein the second display processing means includes a position closest to the center of the first area among positions on the guidance route. An image may be displayed.

  According to this configuration, before the guide route disappears from the map image, by temporarily stopping scrolling, it is possible to prevent the user from scrolling more than intended and disappear from the map image from the guide route. Can do.

  According to the present invention, even when the scale of the map image is enlarged or scrolled, the map image including the guide route or the direction of the guide route is displayed, so that the user can easily guide the guide route. I can grasp it.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a navigation device to which the navigation device of the present invention is applied. A navigation device 100 shown in FIG. 1 is mounted on a vehicle, and includes a main body 10, a hard disk drive (HDD) 20, an operation unit 30, a VICS reception unit 40, a GPS reception unit 50, an autonomous navigation sensor 60, a display 70, and a speaker 80. Consists of.

  The HDD 20 is equipped with a hard disk 22 and reads map data recorded on the hard disk 22. The map data recording medium is not limited to the hard disk 22, and may be a DVD, a CD-ROM, or the like, and a drive corresponding to the recording medium is prepared. The map data is provided for each rectangular area, which is specified by the longitude and latitude in the real space at the four corners, which is called a figure leaf. This map data for each leaf includes information on the scale of the leaf and the longitude and latitude in the real space at the four corners of the rectangular area corresponding to the leaf, and is uniquely identified by these longitude and latitude. The Further, the map data for each leaf includes map image data for the leaf. In addition, the map data for each leaf includes road information of a road existing in a rectangular area corresponding to the leaf.

  FIG. 2 is a diagram illustrating an example of road information. A road is represented by a start point and an end point (node) and a straight line (road link) connecting these nodes. The road information includes a node record shown in FIG. 2 (a) and a link record shown in FIG. 2 (b). The node record shown in FIG. 2A is provided for each node. The node number that is identification information of the node, the coordinates of the node (longitude and latitude in the real space), and the node And a connection link number that is identification information of a link (connection link).

  On the other hand, the link record shown in FIG. 2B is provided for each road link. This link record includes a link number that is identification information of a corresponding road link, link attributes such as whether the road link is a general road or a highway, and identification information of a node that is the starting point of the road link. It includes a certain start point node number and an end point node number that is identification information of a node that is the end point of the road link. With these node records and link records, it is possible to specify the position of a road composed of two nodes, a start point and an end point, and a road link connecting these nodes.

  Again, returning to FIG. The operation unit 30 includes an operation button, a joystick, and the like (not shown), and is operated by the user in setting a destination when searching for a guidance route. The VICS receiving unit 40 receives VICS information including traffic information transmitted from a radio wave beacon or an optical beacon, or multiplexed and transmitted in FM broadcasting. The VICS information is updated and transmitted at a predetermined cycle such as an interval of 5 minutes.

  The GPS receiver 50 receives GPS signals from GPS satellites necessary for detecting the position of the vehicle. The autonomous navigation sensor 60 includes a gyro and the like for detecting the traveling direction of the vehicle, and a distance sensor that generates a pulse (vehicle speed pulse) at every constant travel distance.

  The main body 10 includes a control unit 102, a buffer memory 104, a map drawing unit 106, an operation screen / mark generation unit 108, a guidance route storage unit 110, a guidance route drawing unit 112, a traffic information drawing unit 114, a guidance unit 116, and an image composition unit. 118.

  The control unit 102 is configured by a CPU or the like, and controls the entire navigation device 100. Specifically, the control unit 102 determines the position and speed of the vehicle based on the GPS signal received by the GPS receiving unit 50, the traveling direction of the vehicle detected by the autonomous navigation sensor 60, and the output interval of the vehicle speed pulse. calculate. Further, the control unit 102 instructs the HDD 20 to read the map data recorded on the hard disk 22. The map data read by the HDD 104 in response to an instruction from the control unit 102 is stored in the buffer memory 104. The map drawing unit 106 reads the map data stored in the buffer memory 104 and draws a map image corresponding to the screen of the display 70 based on the map data.

  Further, the control unit 102 issues an image drawing instruction to the operation screen / mark generation unit 108 in accordance with the operation of the operation unit 30 by the user and the operation state of the navigation device 10. In response to this instruction, the operation screen / mark generation unit 108 draws various menu screens, a vehicle position mark, and an image of the cursor position.

  Further, the control unit 102 reads the map data stored in the buffer memory 104 in response to an operation of the operation unit 30 for searching for a guidance route by the user, and based on the map data, a predetermined route search algorithm, for example, Then, using a simulation calculation such as a horizontal search method or a Dijkstra method, a guide route having the lowest link cost from the starting point to the destination is searched. Information on the guide route is stored in the guide route storage unit 110.

  FIG. 3 is a diagram illustrating an example of a guidance route, and FIG. 4 is a diagram illustrating an example of guidance route information. As shown in FIG. 3, when a guidance route that should pass through nodes of node numbers # 1, # 5, # 3, # 8, and # 7 in this order from the departure point to the destination is searched for in FIG. As shown in FIG. 6, in the guidance route information, the node information on the guidance route configured by associating the node numbers of these nodes with the node coordinates is arranged in the order of passage.

  Again, returning to FIG. The guide route drawing unit 112 generates a guide route image based on the guide route information stored in the guide route storage unit 110.

  In addition, the control unit 102 instructs the traffic information drawing unit 114 to select an image mode corresponding to the traffic information indicated by the VICS information received by the VICS receiving unit 40. The traffic information drawing unit 114 draws an image corresponding to the traffic information in a mode corresponding to this instruction.

  In addition, the control unit 102 instructs the guidance processing unit 114 to draw an image and generate a voice for guidance when the vehicle needs to turn at an intersection during route guidance based on the guidance route information. To do. The guidance processing unit 114 draws an enlarged image of an intersection and generates a guidance voice in response to an instruction from the control unit 102. The guidance voice is output from the speaker 80.

  Further, the control unit 102 instructs the image composition unit 118 to perform image composition in accordance with the operation of the operation unit 30 by the user and the operation state of the navigation device 100. In response to this instruction, the image synthesis unit 118 appropriately synthesizes various images drawn by the map drawing unit 106, the operation screen / mark generation unit 108, the guidance route drawing unit 112, the traffic information drawing unit 114, and the guide unit 116. Then, the obtained image is displayed on the display 70 as a display unit.

  In addition, the control unit 102 generates sound according to the operation of the operation unit 30 by the user and the operation state of the navigation device 100, and causes the speaker 80 to output the sound via the guide unit 116.

  In the present embodiment, the control unit 102 corresponds to the guidance route information acquisition unit, the control unit 102 and the HDD 20 correspond to the map data acquisition unit, the control unit 102, the map drawing unit 106, the guidance route drawing unit 112, and the image composition. The unit 118 corresponds to the first and second display processing means.

  Next, details of map image display in the navigation device 100 will be described. In the present embodiment, the navigation device 100 is configured such that when the scale of the map image is enlarged or when the map image is scroll-displayed, the map image includes a guide route or an image indicating the direction of the guide route. To do.

  First, the operation of the navigation device 100 when the scale of the map image is enlarged will be described. FIG. 5 is a flowchart showing an operation of displaying a map image when the scale of the map image is enlarged. The control unit 102 reads the guide route information stored in the guide route storage unit 110 (S101).

  Next, the control unit 102 instructs the HDD 20 to read out the scale data that can display the entire guidance route and a predetermined range of map data. Specifically, the control unit 102 grasps the position of the entire guide route by connecting the node coordinates in the node information on each guide route included in the guide route information. Next, when the map image is displayed on the screen of the display 70, the control unit 102 specifies the maximum scale that can include the entire guide route. Further, the control unit 102 sets a rectangular area corresponding to the screen of the display 70 as a predetermined range including the entire guidance route according to the specified scale. The predetermined range to be set is specified by the longitude and latitude in the real space at the four corners.

Then, the control unit 102 outputs the specified scale and the longitude and latitude in the real space at the four corners of the set predetermined range to instruct the reading of map data. In response to this instruction, the HDD 20 receives the longitude and latitude in the real space at the four corners of the inputted predetermined range, and the longitude and latitude in the real space at the four corners of the figure leaf (rectangular region) included in the inputted scale map data Are read out from the hard disk 22 (S102). The read map data is stored in the buffer memory 104.

  Next, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the predetermined range set in S102 described above to the map drawing unit 106. The map drawing unit 106 reads the map data stored in the buffer memory 104 and draws a map image corresponding to the leaf based on the map image data included in the map data. Further, the map drawing unit 106 cuts out a map image corresponding to the predetermined range input from the control unit 102 as a rectangular map image corresponding to the screen of the display 70 from the drawn map image. The extracted map image is output to the image composition unit 118.

  FIG. 6 is a diagram illustrating an example of cutting out a map image. Each of the map images 250-1, 250-2, 250-3, and 250-4 is a map image corresponding to one map leaf. The map drawing unit 106 draws the map images 250-1, 250-2, 250-3, and 250-4 corresponding to the respective leaves, and then displays the rectangular map image 200-1 corresponding to the screen of the display 70. cut. The clipped map image 200-1 is in a range that includes the entire guide route 210 from the departure point 211 to the destination 212.

  Returning again to FIG. Further, the control unit 102 outputs the longitude and latitude in the real space of the four corners of the predetermined range set in S102 described above and the specified scale to the guidance route drawing unit 112. The guide route drawing unit 112 has the longitude, latitude, and scale in the real space of the four corners of the predetermined range, and the node coordinates in each guide route node information included in the guide route information stored in the guide route storage unit 110. Based on the above, an image of the guide route having an appropriate arrangement and scale is drawn to be superimposed on the map image. The drawn guide route image is output to the image composition unit 118.

  Further, the control unit 102 instructs the image composition unit 118 to perform image composition. In response to this instruction, the image composition unit 118 synthesizes the map image from the map drawing unit 106 and the guide route image from the guide route drawing unit 112 and displays the obtained image on the display 70 (S103). .

  Next, the control unit 102 determines whether or not the user has operated the operation unit 30 to give an instruction to enlarge the scale of the map image (S104). When the scale enlargement instruction is not given, the series of operations is terminated.

  On the other hand, when the scale enlargement instruction is given, the control unit 102 calculates the distance between the center of the map image displayed on the display 70 and the guidance route. Specifically, the control unit 102 determines the longitude and latitude in the real space at the four corners of the predetermined range set in S102 described above, in other words, the longitude in the real space at the four corners of the map image displayed on the display 70. Based on the latitude and the latitude, the longitude and latitude in the real space at the center of the map image are calculated. Next, the control unit 102 grasps the position of the entire guide route by connecting the node coordinates in each guide route node information included in the guide route information, and the longitude and the real space of each position on the guide route Based on the latitude and the longitude and latitude of the center of the map image in real space, the distance between the center of the map image and each position on the guidance route is calculated. Further, based on the calculated distance, the control unit 102 specifies the longitude and latitude in the real space of the position on the guidance route (shortest distance position) where the distance from the center of the map image is the shortest (S105).

  FIG. 7 is a diagram illustrating an example of a positional relationship between the guide route and the map image center. In FIG. 7, the position where the distance from the center 201 of the map image is the shortest in the guide route that passes through the nodes of node numbers # 1, # 5, # 3, # 8, and # 7 in this order is a point. P.

  Returning again to FIG. Next, the control unit 102 instructs the HDD 20 to read map data at a scale including the shortest distance position and instructed by the user. Specifically, the control unit 102 sets a rectangular area corresponding to the screen of the display 70 centered on the shortest distance position specified in S105 described above as a predetermined range according to the scale instructed by the user. . The predetermined range to be set is specified by the longitude and latitude in the real space at the four corners.

  Then, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the set predetermined range and the scale instructed by the user to the HDD 20 and instructs to read the map data. In response to this instruction, the HDD 20 compares the longitude and latitude in the four corners of the input real space with the longitude and latitude in the four corners of the map leaf included in the input scale data. Then, the map data of the leaf overlapping the predetermined range is read from the hard disk 22 (S106). The read map data is stored in the buffer memory 104.

  Next, the control unit 102 outputs the longitude and latitude in the real space of the four corners of the predetermined range set in S106 described above to the map drawing unit 106. The map drawing unit 106 reads the map data stored in the buffer memory 104 and draws a map image corresponding to the leaf based on the map image data included in the map data. Further, the map drawing unit 106 cuts out a map image corresponding to a predetermined range input from the control unit 102 from the drawn map image as a rectangular map image corresponding to the screen of the display 70. The extracted map image is output to the image composition unit 118.

  Next, the control unit 102 outputs the longitude and latitude in the real space of the four corners of the predetermined range set in S106 described above to the map drawing unit 106. The map drawing unit 106 reads the map data stored in the buffer memory 104 and draws a map image corresponding to the leaf based on the map image data included in the map data. Further, the map drawing unit 106 cuts out a map image corresponding to the predetermined range input from the control unit 102 as a rectangular map image corresponding to the screen of the display 70 from the drawn map image. The extracted map image is output to the image composition unit 118.

  Further, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the predetermined range set in S106 described above and the scale instructed by the user to the guidance route drawing unit 112. The guide route drawing unit 112 has the longitude, latitude, and scale in the real space of the four corners of the predetermined range, and the node coordinates in each guide route node information included in the guide route information stored in the guide route storage unit 110. Based on the above, an image of the guide route having an appropriate arrangement and scale is drawn to be superimposed on the map image. The drawn guide route image is output to the image composition unit 118.

  Further, the control unit 102 instructs the image composition unit 118 to perform image composition. In response to this instruction, the image synthesis unit 118 synthesizes the map image from the map drawing unit 106 and the guidance route image from the guidance route drawing unit 112. The image obtained here is a map image of a scale instructed by the user, centered on the position on the guidance route where the distance from the center of the map image is the shortest. The obtained image is displayed on the display 70 (S107).

  Here, when the scale is enlarged, the real space area corresponding to the map image displayed on the display 70 becomes narrower than the real space area corresponding to the map image displayed in S103. FIG. 8 is a diagram illustrating an example of image transition when the scale of a map image is enlarged. As shown in FIG. 8A, when the map image 200-1 including the entire guide route 210 from the starting point 211 to the destination 212 is displayed, the user gives an instruction to enlarge the scale of the map image. Then, as shown in FIG. 8 (b), the position 215 on the guide route 210 has the indicated scale and the distance from the center 201 of the map image 200-1 in FIG. 8 (a) is the shortest. A map image 200-2 centering on is displayed.

  Next, the first operation of the navigation device 100 when the map image is scroll-displayed will be described. 9 and 10 are flowcharts showing a first operation of displaying a map image when the map image is scroll-displayed. In the present embodiment, the operations shown in FIGS. 9 and 10 are performed after the operation shown in FIG.

  The control unit 102 determines whether or not the operation unit 30 has been operated by the user and an instruction to scroll the map image has been given (S201). If no scrolling instruction is given, the series of operations is terminated.

  On the other hand, when a scroll instruction is given, the control unit 102 sets the range of the map image after scrolling. Specifically, the control unit 102 detects the amount and direction of movement of the cursor displayed superimposed on the map image that moves in response to a scroll instruction from the user. Next, the control unit 102 sets, as the range of the map image after scrolling, the range obtained by moving the predetermined range set in S106 of FIG. 5 described above in the amount and direction according to the detected movement amount and movement direction of the cursor. Set. The range of the map image after scrolling is specified by the longitude and latitude in the real space at the four corners. For example, when a map image with a scale of 1 / 10,000 is displayed and the cursor moves 1 cm, a range obtained by moving the predetermined range set in S106 of FIG. 5 by 100 m is the map image after scrolling. It becomes a range.

  Further, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the set map image range after scrolling to the map drawing unit 106. The map drawing unit 106 cuts out the range of the map image after scrolling from the map image drawn in S107 of FIG. 5 described above, and outputs it to the image composition unit 118 as the map image after scrolling. When the range of the map image after scrolling protrudes the map image drawn in S107 of FIG. 5 described above, the control unit 102 controls the HDD 20 to read out the map data corresponding to the protruding part from the hard disk 22. Then, the data is newly stored in the buffer memory 104. The map drawing unit 106 draws a map image based on the map image data included in the map data corresponding to the protruding portion, the drawn map image, and the map image drawn in S107 of FIG. 5 described above. The area of the map image after scrolling is cut out.

  Next, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the range of the map image after scrolling set in S202 described above to the guidance route drawing unit 112. The guide route drawing unit 112 includes the longitude and latitude in the real space at the four corners of the range of the map image after scrolling, and the node information in each guide route node information included in the guide route information stored in the guide route storage unit 110. Based on the node coordinates, an image of a guide route with an appropriate arrangement for drawing on the map image is drawn. The drawn guide route image is output to the image composition unit 118.

  Further, the control unit 102 instructs the image composition unit 118 to perform image composition. In response to this instruction, the image composition unit 118 synthesizes the scrolled map image from the map drawing unit 106 and the guide route image from the guide route drawing unit 112 and displays them on the display 70 (S202). Thereby, the map image after scrolling is displayed.

  Next, the control unit 102 determines whether or not the guidance route may disappear from the scrolled map image displayed on the display 70 (S203). Specifically, the control unit 102 grasps the position of the entire guide route by connecting the node coordinates in the node information on each guide route included in the guide route information read in S101 of FIG. 5 described above. Further, the control unit 102 determines based on the position of the entire guide route grasped, the longitude and latitude in the real space at the four corners of the range of the map image after scrolling set in S202, and the movement direction of the cursor detected in S202. Whether the extension distance of the guidance route included in the range of the map image after scrolling is equal to or less than a predetermined length, and the direction from the center of the range of the map image after scrolling to the guidance route is the moving direction of the cursor Is included in a predetermined range of directions centered on the opposite direction. The extension distance of the guide route included in the range of the map image after scrolling is a predetermined length or less, and the direction from the center of the range of the map image after scrolling to the guide route is opposite to the moving direction of the cursor When the cursor is continuously moved toward the detected moving direction, the guide route is not included in the range of the map image after scrolling. In this case, the control unit 102 determines that the guidance route may disappear from the scrolled map image displayed on the display 70.

  When there is no possibility that the guidance route disappears from the scrolled map image displayed on the display 70, the operations after the drawing of the map image and the scroll display (S202) are repeated.

  On the other hand, when there is a possibility that the guidance route may disappear from the scrolled map image displayed on the display 70, the control unit 102 temporarily stops the control of the scroll display of the map image (S204). Specifically, the control unit 102 temporarily stops the setting of the range of the map image after scrolling and the output of the longitude and latitude in the real space at the four corners of the range to the map drawing unit 106 (S204).

  Further, the control unit 102 determines whether or not an instruction to continue scrolling the map image has been given by the operation of the operation unit 30 being continued by the user (S205). If no instruction to continue scrolling is given, the series of operations is terminated.

  On the other hand, when an instruction to continue scrolling is given, a map image after scrolling is drawn and displayed on the display 70 in accordance with the instruction (S206). Specific processing is the same as that in S202 described above. Thereafter, the control unit 102 determines whether or not the guidance route has disappeared from the map image after scrolling (S207). Specifically, as in S203 described above, the control unit 102 grasps the position of the entire guide route, and the actual position of the four corners of the range of the map image after scrolling set in S206. Based on the longitude and latitude in the space and the moving direction of the cursor detected in S206, it is determined whether or not the guidance route is included in the range of the map image after scrolling. When the guidance route is included in the range of the map image after scrolling, a negative determination is made, and the operation after the determination of whether or not the scroll operation is continued (S205) is repeated.

  On the other hand, when the guidance route is not included in the range of the map image after scrolling, an affirmative determination is made in S207 and the operation proceeds to the operation shown in FIG. Based on the longitude and latitude in the real space at the four corners of the range of the map image after scrolling set in S206 of FIG. 9 described above, the control unit 102 is on the real space at the center of the map image after scrolling. Calculate longitude and latitude. Next, the control unit 102 grasps the position of the entire guide route by connecting the node coordinates in each guide route node information included in the guide route information, and the longitude and the real space of each position on the guide route Based on the latitude and the longitude and latitude of the center of the map image in real space, the distance between the center of the map image after scrolling and each position on the guidance route is calculated. Further, based on the calculated distance, the control unit 102 specifies the longitude and latitude in the real space of the position on the guidance route (shortest distance position) where the distance from the center of the map image after scrolling is the shortest (shortest distance position) ( S211).

  Further, the control unit 102 performs post-scrolling based on the longitude and latitude in the real space at the center of the map image after scrolling calculated in S211 and the longitude and latitude in the real space at the specified shortest distance position. The direction from the center of the map image to the shortest distance position is specified (S212). Information on the identified direction is output to the guidance route drawing unit 112. The guide route drawing unit 112 draws an image indicating the direction of the guide route according to the input direction information, and outputs the image to the image composition unit 118. Further, the control unit 102 instructs the image composition unit 118 to perform image composition. In response to this instruction, the image composition unit 118 synthesizes the scrolled map image from the map drawing unit 106 and the image indicating the direction of the guidance route from the guidance route drawing unit 112 and displays the synthesized image on the display 70 ( S213).

  Thereby, when the guidance route disappears from the map image after scrolling, an image indicating the direction of the guidance route from the center of the map image after scrolling is displayed superimposed on the map image. FIG. 11 is a diagram illustrating a first example of transition when scrolling a map image. As shown in FIG. 11A, a case is considered where a guide route 210 is included in the right corner of the map image 200-3. In this case, when scrolling in the left direction is continued and the guide route 210 disappears from the map image, the map image 200-4 after scrolling is displayed on the map image 200-4 as shown in FIG. A direction image 220 showing the direction of the guide route from -4 (here, the right direction) is displayed.

  Next, the second operation of the navigation device 100 when the map image is scroll-displayed will be described. In the second operation, the same operation as in FIG. 9 in the first operation described above is performed, and then the operation shown in FIG. 12 is performed.

  That is, if it is determined in S207 of FIG. 9 that the guidance route is not included in the range of the map image after scrolling, the control unit 102 then performs the post-scrolling set in S206 of FIG. 9 described above. Based on the longitude and latitude in the real space at the four corners of the range of the map image, the longitude and latitude in the real space at the center of the scrolled map image are calculated. Next, the control unit 102 grasps the position of the entire guide route by connecting the node coordinates in each guide route node information included in the guide route information, and the longitude and the real space of each position on the guide route Based on the latitude and the longitude and latitude of the center of the map image in real space, the distance between the center of the map image after scrolling and each position on the guidance route is calculated. Further, based on the calculated distance, the control unit 102 specifies the longitude and latitude in the real space of the position on the guidance route (shortest distance position) where the distance from the center of the map image after scrolling is the shortest (shortest distance position) ( S221).

Furthermore, the control unit 102 instructs the HDD 20 to read out the map data of a scale and a predetermined range that can display the shortest distance position and the center of the map image after scrolling. Specifically, when a map image is displayed on the screen of the display 70, the control unit 102 displays both the shortest distance position specified in S221 described above and the calculated center of the map image after scrolling. Identify the maximum scale that can be included. This scale is smaller than the scale of the scrolled map image displayed in S206 of FIG. Furthermore, the control unit 102 includes both the shortest distance position specified in S221 described above and the calculated center of the map image after scrolling according to the specified scale, and corresponds to the screen of the display 70. The rectangular area to be set is set as a predetermined range. The predetermined range to be set is specified by the longitude and latitude in the real space at the four corners. Then, the control unit 102 outputs the specified scale and the longitude and latitude in the real space at the four corners of the set predetermined range to instruct the reading of map data. In response to this instruction, the HDD 20 receives the longitude and latitude in the real space at the four corners of the inputted predetermined range, and the longitude and latitude in the real space at the four corners of the figure leaf (rectangular region) included in the inputted scale map data. Are read out from the hard disk 22 (S222). The read map data is stored in the buffer memory 104.

  Next, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the predetermined range set in S222 described above to the map drawing unit 106. The map drawing unit 106 reads the map data stored in the buffer memory 104 and draws a map image corresponding to the leaf based on the map image data included in the map data. Further, the map drawing unit 106 specifies the map image corresponding to the predetermined range input from the control unit 102 from the drawn map image, in other words, the rectangular map image corresponding to the screen of the display 70, in other words, specified in the above-described S221. A rectangular map image including both the shortest distance position and the calculated center of the scrolled map image is cut out. The extracted map image is output to the image composition unit 118.

  Further, the control unit 102 outputs the longitude and latitude in the real space at the four corners of the predetermined range set in S222 described above and the specified scale to the guidance route drawing unit 112. The guide route drawing unit 112 has the longitude, latitude, and scale in the real space of the four corners of the predetermined range, and the node coordinates in each guide route node information included in the guide route information stored in the guide route storage unit 110. Based on the above, an image of the guide route having an appropriate arrangement and scale is drawn to be superimposed on the map image. The drawn guide route image is output to the image composition unit 118.

  Further, the control unit 102 instructs the image composition unit 118 to perform image composition. In response to this instruction, the image synthesis unit 118 synthesizes the map image from the map drawing unit 106 and the guidance route image from the guidance route drawing unit 112, and displays the obtained image on the display 70 (S223). .

  Here, the real space area corresponding to the map image displayed on the display 70 is narrower than the real space area corresponding to the map image displayed in S206 of FIG. As a result, when the guidance route disappears from the scrolled map image, the scale is reduced and a map image including the guidance route is displayed. FIG. 13 is a diagram illustrating a second example of the transition when the map image is scrolled. As shown in FIG. 13A, a case is considered where a guide route 210 is included in the right corner of the map image 200-5. In this case, when scrolling in the left direction is continued and the guide route 210 disappears from the map image, the scale of the map image 200-4 after scrolling is reduced as shown in FIG. 13B. The guidance route 211 is included.

  As described above, the navigation device 100 according to the present embodiment can include the guidance route in the scaled map image when the scale is enlarged when the map image including the guidance route is displayed. The user can easily grasp the guidance route. In addition, the navigation device 100 of the present embodiment displays an image indicating the direction of the guidance route when the guidance route disappears from the map image by scrolling the map image including the guidance route, or The scale of the map image can be reduced to include the guide route in the map image, and the user can easily grasp the guide route.

  In the embodiment described above, when the guidance route disappears from the scrolled map image in S207 of FIG. 9, an image showing the direction of the guidance route is displayed by the operation of FIG. 10, or the operation of FIG. Thus, the scale of the map image is reduced and the map image including the guidance route is displayed, but the determination operation in S207 may be omitted. In this case, in S203 of FIG. 9, it is determined whether or not the guidance route may disappear from the map image after scrolling. If there is a possibility of disappearance, an operation for scrolling by the user is performed. If is continued, an image indicating the direction of the guide route is displayed, or a map image including the guide route is displayed by reducing the scale of the map image.

  In the embodiment described above, in the operation shown in FIG. 5, the map image centered on the position on the guide route having the shortest distance from the center of the map image is displayed. A map image centered on any position on the guidance route, such as a map image centered on the position, may be displayed. In the embodiment described above, in the operation shown in FIG. 10, the image indicating the direction of the position on the guidance route that is the shortest distance from the center of the map image is displayed. An image indicating the direction of any position on the guidance route such as the above may be displayed. Furthermore, in the embodiment described above, in the operation shown in FIG. 12, the map image including the position on the guide route with the shortest distance from the center of the map image is displayed. A map image including any position on the guide route, such as a map image centered on, may be displayed.

  In the above-described embodiment, in the operation illustrated in FIG. 9, the scroll is temporarily stopped when the guide route may disappear from the map image after scrolling. However, the scroll may not be temporarily stopped.

  As described above, the navigation device according to the present invention can perform map image display that facilitates grasping of the guidance route, and is useful as a navigation device.

It is a figure which shows the structure of a navigation apparatus. It is a figure which shows an example of road information. It is a figure which shows an example of a guidance path | route. It is a figure which shows an example of guidance route information. It is a flowchart which shows operation | movement of the map image display at the time of the scale expansion of a map image. It is a figure which shows an example of extraction of a map image. It is a figure which shows an example of the positional relationship of a guidance path | route and map image center. It is a figure which shows an example of the image transition at the time of the scale expansion of a map image. It is a 1st flowchart which shows the 1st and 2nd operation | movement of the map image display at the time of the scroll of a map image. It is a 2nd flowchart which shows the 1st operation | movement of the map image display at the time of the scroll of a map image. It is a figure which shows the 1st example of the image transition at the time of the scroll of a map image. It is a 2nd flowchart which shows the 2nd operation | movement of the map image display at the time of the scroll of a map image. It is a figure which shows the 2nd example of the image transition at the time of the scroll of a map image. It is a figure which shows an example of the image transition at the time of the scale expansion of the conventional map image.

Explanation of symbols

10 Main body 20 Hard disk drive (HDD)
DESCRIPTION OF SYMBOLS 22 Hard disk 30 Operation part 40 Communication part 50 GPS receiving part 60 Autonomous navigation sensor 70 Display 80 Speaker 100 Navigation apparatus 102 Control part 104 Buffer memory 106 Map drawing part 108 Operation screen and mark generation part 110 Guidance path memory | storage part 112 Guidance path drawing part 114 Traffic information drawing unit 116 Guide unit 118 Image composition unit

Claims (5)

A navigation device for guiding a guidance target by searching for a guidance route to a destination,
Guidance route information acquisition means for acquiring information of the guidance route;
Map data acquisition means for acquiring map data;
Based on the guide route information acquired by the guide route information acquisition unit and the map data acquired by the map data acquisition unit, a map image of the first area including the guide route is displayed on the display unit. First display processing means;
When an instruction to enlarge the scale of the map image is given during the display of the map image of the first area, the information on the guide route acquired by the guide route information acquisition unit and the map data acquisition unit Second display processing means for displaying, on a display unit, a map image of a second area including the guidance route and having a scale larger than that of the map image of the first area, based on map data. And
The guide route information includes position information of the guide route,
The second display processing means displays a map image of the second area centered on a position closest to the center of the first area among the positions on the guidance route,
Based on the position information of the guide route, comprising a shortest position specifying means for specifying a position on the guide route that has the shortest distance from the center of the first region,
A navigation apparatus for displaying a map image of the second area centered on a position on a guidance route specified by the shortest position specifying means. A navigation device for guiding a guidance target by searching for a guidance route to a destination,
Guidance route information acquisition means for acquiring information of the guidance route;
Map data acquisition means for acquiring map data;
Based on the guide route information acquired by the guide route information acquisition unit and the map data acquired by the map data acquisition unit, a map image including the guide route is displayed on the display unit while scrolling. Display processing means,
Whether or not the guidance route has disappeared from the map image displayed on the display unit based on the guidance route information acquired by the guidance route information acquisition means, or whether or not there is a possibility of disappearance Erasure determination means for determining;
When it is determined by the disappearance determination means that the guidance route has disappeared from the map image or is likely to disappear, based on the information of the guidance route acquired by the guidance route information acquisition means, Second display processing means for displaying on the display unit an image indicating a direction of the guidance route with respect to an area corresponding to a map image, overlaid on the map image;
The guide route information includes position information of the guide route,
The second display processing means displays an image indicating a direction of a position closest to a center of an area corresponding to the map image among positions on the guidance route,
Based on the position information of the guide route, the shortest position specifying means for specifying the position on the guide route that has the shortest distance from the center of the area corresponding to the map image,
An navigation device, wherein an image showing a direction of a position on the guidance route specified by the shortest position specifying means is displayed.   Based on information on the guide route acquired by the guide route information acquisition means, scroll stop means is provided for temporarily stopping the scrolling before the guide route disappears from the map image displayed on the display unit. The navigation device according to claim 2. A navigation device for guiding a guidance target by searching for a guidance route to a destination,
Guidance route information acquisition means for acquiring information of the guidance route;
Map data acquisition means for acquiring map data;
A display unit that scrolls the map image of the first area including the guide route based on the guide route information acquired by the guide route information acquisition unit and the map data acquired by the map data acquisition unit. First display processing means to be displayed on,
Whether or not the guidance route has disappeared from the map image displayed on the display unit based on the guidance route information acquired by the guidance route information acquisition means, or whether or not there is a possibility of disappearance Erasure determination means for determining;
When it is determined by the disappearance determination means that the guidance route has disappeared from the map image or is likely to disappear, based on the information of the guidance route acquired by the guidance route information acquisition means, Second display processing means for displaying on the display unit a map image of the second area which includes a guide route and is reduced in scale than the map image of the first area;
The guide route information includes position information of the guide route,
The second display processing means displays a map image of the second area including the position closest to the center of the first area among the positions on the guidance route,
Based on the position information of the guide route, comprising a shortest position specifying means for specifying a position on the guide route that has the shortest distance from the center of the first region,
A navigation apparatus for displaying a map image of the second area including a position on the guidance route specified by the shortest position specifying means.   Based on the guidance route information acquired by the guidance route information acquisition means, the scrolling temporarily stops the scrolling before the guidance route disappears from the map image of the first area displayed on the display unit. 5. The navigation apparatus according to claim 4, further comprising stop means.

Images