JP2008286755A - Map image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a "map image display device" which displays a map image on an appropriate contraction scale considering the intention of its user. <P>SOLUTION: A controller 102 inside the main part 10 of a car navigation system 100 determines whether or not the position of its own car is in a parking lot on a map image. Next, the controller 102 determines whether or not the contraction scale of the map image is a contraction scale maximum necessary for displaying the whole of the parking lot, when the car position is inside the parking lot on the map image. Moreover, when the contraction scale is not the maximum contraction scale capable of displaying the whole of the parking lot, the controller 102 changes the contraction scale of the map image to the maximum contraction scale capable of displaying the whole of the parking lot, and allows the display device to display the map image. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a map image display device that displays a map image around a vehicle position.

The vehicle-mounted navigation device displays a map image of the vicinity of the vehicle position and the like on the display in order to appropriately guide the vehicle to the destination. At this time, the display method of the map image can be changed according to a user's operation instruction. For example, in the technique described in Patent Document 1, the scale of the map image is changed according to the continuous pressing time of the scroll key by the user. Moreover, in the technique described in Patent Document 2, the area name included in the map image is changed according to the scrolling speed according to the user's operation instruction.
JP-A-8-69515 JP 2005-292621 A

  By the way, for example, when the vehicle position is in a parking lot and the vehicle exits from the parking lot, the user generally performs an operation for switching the map image to a scale that can grasp the exit. Alternatively, when scrolling the map image, if the cursor position is on an image that does not change, such as a lake or a desert, it is difficult for the user to know where the cursor position is on the map. In order to make the grasp possible, an operation for reducing the scale of the map image is generally performed. Since the switching of the scale of such a map image is performed relatively frequently, the user often feels complicated.

  An object of the present invention is to solve the above-described problems, and to provide a map image display device capable of displaying a map image at an appropriate scale in consideration of a user's intention.

  A map image display device for displaying a map image according to the present invention acquires vehicle position acquisition means for acquiring a position of a vehicle on which the map image display device is mounted, and map data including region information of a specific region. Processing for displaying a map image around the vehicle position on the display unit based on the map data acquisition means, the vehicle position acquired by the vehicle position acquisition means, and the map data acquired by the map data acquisition means Whether the vehicle position exists in the specific area based on the map image display processing means for performing the map data, the map data acquired by the map data acquisition means, and the vehicle position acquired by the vehicle position acquisition means A position determination unit that determines whether or not the vehicle unit is within the specific area by the position determination unit. And having a scale switching means for switching the scale of the map image around the vehicle position displayed on.

  According to this configuration, when the vehicle position is within a specific area such as a parking lot, the scale of the map image around the vehicle position is switched, and the user grasps the positional relationship between the vehicle position and the specific area. It becomes possible.

  In the map image display device according to the present invention, the area information of the specific area includes position information of the exit of the specific area, the vehicle position acquired by the vehicle position acquisition means, and the exit of the specific area You may make it have a path | route display process means to perform the process which displays the path | route from the said vehicle position to the exit of the said specific area on the said display unit based on position information.

  According to this configuration, since the route to the exit is displayed together with the entire map image of the specific area, the user can escape from the specific area more easily.

  A map image display device for displaying a map image according to the present invention is based on map data acquisition means for acquiring map data including area information of a specific area, and map data acquired by the map data acquisition means. Map image display processing means for performing processing for displaying a map image on a display unit, cursor position specifying means for specifying a cursor position on the map image displayed on the display unit, and acquired by the map data acquisition means Based on the map data and the cursor position specified by the cursor position specifying means, position determining means for determining whether or not the cursor position exists in the specific area; and A map image around the vehicle position displayed on the display unit when it is determined that the vehicle exists in the specific area. And having a scale switching means for switching the scale.

  According to this configuration, when the cursor position is in a specific area such as a lake, the scale of the map image is switched, and the user can grasp where the cursor position is on the map. It becomes.

  In the map image display device according to the present invention, the scale switching means switches the scale of the map image around the vehicle position to the maximum scale that the entire specific area can display on the display unit. May be.

  According to this configuration, when the vehicle position is in a specific area such as a parking lot, the scale of the map image is changed to the maximum scale that can display the entire specific area. It is possible to grasp the position of the exit for exiting the area. Alternatively, when the cursor position is within a specific area such as a lake, the scale of the map image is changed to the maximum scale that can display the entire specific area. It is possible to grasp where it exists.

  According to the present invention, when the vehicle position or the cursor position on the map image exists in the specific area, the scale of the map image is switched, and the positional relationship between the vehicle position or the cursor position and the specific area is changed by the user. The map image is displayed at an appropriate scale in consideration of the user's intention so that it can be grasped.

  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 car navigation device to which a map image display device of the present invention is applied. A car 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 communication 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 includes a plurality of leaf data corresponding to a map image of a rectangular area at each stepwise scale. This figure data includes scale information and the longitude and latitude of the four corners of the rectangular area, and is uniquely specified by these longitude and latitude. The map data includes road information including a set of a plurality of positions (nodes) specified by latitude and longitude for a road (including a passage in a parking lot).

  Further, the map data includes specific area information for specifying a predetermined area (specific area) such as a parking lot, a lake, and a desert. FIG. 2 is a diagram illustrating an example of specific area information. The specific area information shown in FIG. 2 is provided for each specific area. The area ID, which is identification information of the specific area, the area type indicating the type of the specific area, the longitude and latitude of the outer periphery of the specific area, including. When the specific area is a parking lot, the specific area information includes the longitude and latitude of the parking lot exit. Hereinafter, the leaf data and the specific area information are collectively referred to as map data as appropriate.

  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 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 communication unit 40 is, for example, a mobile phone, and communicates with the outside in order to acquire various information necessary for the car navigation device 100. 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, and an image composition unit 118.

  In the present embodiment, the GPS receiving unit 50, the autonomous navigation sensor 60, and the control unit 102 correspond to vehicle position acquisition means, the HDD 20 corresponds to map data acquisition means, and the map drawing unit 106 corresponds to map image display processing means. The control unit 102 corresponds to the position determination unit, the scale switching unit, and the cursor position specifying unit, and the control unit 102 and the guidance route drawing unit 112 correspond to the route display processing unit.

  The control unit 102 controls the entire car navigation device 100. Specifically, the control unit 102 determines the position, direction, and position 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 the speed. Further, the control unit 102 instructs the HDD 20 to read the map data recorded on the hard disk 22. The map data read out 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 generates a map image corresponding to the screen of the display 70 based on the map data.

  In addition, the control unit 102 issues an image generation instruction to the operation screen / mark generation unit 108 according to the operation of the operation unit 30 by the user or the operation state of the car navigation device 10. In response to this instruction, the operation screen / mark generator 108 generates images of various menu screens, vehicle position marks, and cursor positions.

  Further, the control unit 102 reads out map data stored in the buffer memory 104 in accordance with an operation for searching for a guidance route by the operation unit 30 by the user, and uses a predetermined route search algorithm based on the map data. To set a guide route to the destination. Information on the set guide route (for example, a set of nodes (longitude and latitude) corresponding to the guide route from the departure point to the destination) is stored in the guide route storage unit 110. 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.

  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 or the operation state of the car navigation device 100. In response to this instruction, the image composition unit 118 appropriately composes various images generated by the map drawing unit 106, the operation screen / mark generation unit 108, and the guidance route drawing unit 112, and displays the obtained image on the display 70. Let

  In addition, the control unit 102 generates sound according to the operation of the operation unit 30 by the user or the operation state of the car navigation device 100 and causes the speaker 80 to output the sound. For example, the control unit 102 generates guidance voice such as an instruction to turn at an intersection based on the guidance route information during route guidance, and causes the speaker 80 to output the guidance voice.

  Next, details of the scale switching of the map image display in the car navigation device 100 will be described. In the present embodiment, the car navigation device 100 switches the scale of the map image to the maximum scale that can display the entire specific area when the vehicle position or the cursor position exists within the specific area of the map image.

  FIG. 3 is a flowchart showing a first operation for switching the scale of a map image. The control unit 102 calculates the position 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 vehicle speed pulses (S101).

  Next, the control unit 102 instructs the HDD 20 to read out map data corresponding to the predetermined range around the vehicle position calculated in S101. Here, the predetermined range is centered on the vehicle position, and is specified by the longitude and latitude of the outer periphery of the predetermined range. In response to this instruction, the HDD 20 compares the longitude and latitude of the outer peripheral portion of the predetermined range with the longitude and latitude of the four corners of the rectangular region included in the leaf data, and stores the leaf data of the rectangular region overlapping the predetermined range. Read from the hard disk 22. Further, the HDD 20 reads the specific area information and the road information from the hard disk 22 (S101). The read map data including map data, specific area information, and road information is stored in the buffer memory 104.

  Next, the control unit 102 notifies the map drawing unit 106 of the vehicle position calculated in S101. The map drawing unit 106 reads out the leaf data stored in the buffer memory 104, and based on the leaf data, a rectangular map image corresponding to the screen of the display 70 with the notified vehicle position as the screen center position. 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 appropriately synthesizes the map image from the map drawing unit 106 and various images generated by the operation screen / mark generation unit 108 and displays the obtained image on the display 70. (S103).

  Next, the control unit 102 reads out the specific area information stored in the buffer memory 104 and whose area type is a parking lot. Further, the control unit 102 compares the longitude and latitude indicated by the vehicle position calculated in S101 with the longitude and latitude of the outer peripheral portion of the specific area included in the read specific area information, and determines whether the vehicle position is in the parking lot. It is determined whether or not (S104). When the vehicle position is outside the parking lot, the operation after the calculation of the vehicle position (S101) is repeated again.

  On the other hand, when the vehicle position is in the parking lot, the control unit 102 determines whether or not the map image currently displayed on the display 70 is the maximum scale that can display the entire parking lot where the vehicle position exists. Is determined (S105). Specifically, the control unit 102 grasps the longitude and latitude of the four corners of the rectangular map image currently displayed on the display 70. Here, the rectangular map image currently displayed on the display 70 has the vehicle position as the center position of the screen, and the control unit 102 further recognizes the vehicle position and the scale of the map image. is doing. Therefore, the control unit 102 can grasp the longitudes and latitudes of the four corners of the rectangular map image currently displayed on the display 70 based on the vehicle position and the scale of the map image. Further, the control unit 102 detects the longitude and latitude of the four corners of the rectangular map image currently displayed on the display 70 and the outer peripheral portion of the specific area included in the specific area information of the parking lot where the vehicle position exists. The longitude and latitude are compared, and it is determined whether or not the entire parking lot is displayed on the display 70.

  When the entire parking lot is not displayed on the display 70, the control unit 102 determines that the map image currently displayed on the display 70 is not the maximum scale that can display the entire parking lot. On the other hand, when the entire parking lot is displayed on the display 70, the control unit 102 further increases the scale set at that time by one step and increases the virtual rectangle displayed on the display 70. The longitude and latitude of the four corners of the map image are grasped. For example, when the scale is doubled, the virtual rectangular map image displayed on the display 70 corresponds to a region whose area having the vehicle position as the screen center position is ¼. Based on the relationship between the scale and the vehicle position and the virtual rectangular map image displayed on the display 70, the control unit 102 increases the virtual scale displayed on the display 70 when the scale is increased by one step. It is possible to grasp the longitude and latitude of the four corners of a rectangular map image. Further, the control unit 102 includes the longitude and latitude of the four corners of the virtual rectangular map image displayed on the display 70 and the specific area information of the parking lot where the vehicle position exists when the scale is increased by one step. The longitude and latitude of the outer peripheral part of the specific area to be compared are compared, and it is determined whether or not the entire parking lot is displayed on the display 70 when the scale is increased by one step. Even when the scale is increased by one step, if the entire parking lot is displayed on the display 70, the map image displayed on the display 70 at that time is the maximum scale at which the entire parking lot can be displayed. It is determined that it is not. On the other hand, if the entire parking lot is not displayed on the display 70 when the scale is increased by one step, the map image displayed on the display 70 at that time is the maximum scale that can display the entire parking lot. Is determined.

  When the map image currently displayed on the display 70 is not the maximum scale that can display the entire parking lot, the control unit 102 displays the virtual rectangle displayed on the display 70 at each scale. The longitude and latitude of the four corners of the map image are grasped. Specifically, as described above, the control unit 102 controls the display 70 at each scale based on the relationship between the scale and the vehicle position and the virtual rectangular map image displayed on the display 70. The longitude and latitude of the four corners of the displayed virtual rectangular map image can be grasped. Further, the control unit 102 is included in the longitude and latitude of the four corners of the virtual rectangular map image displayed on the display 70 and the specific area information of the parking lot where the vehicle position exists at each scale scale. By comparing the longitude and latitude of the outer periphery of the specific area, the scale that the entire parking lot can display on the display 70 is specified, and the maximum scale of the specified scales can be displayed on the entire parking lot. Specify as the largest scale.

  Next, the control unit 102 corresponds to a predetermined range around the vehicle position calculated in S101 on the HDD 20, and is the maximum scale that can display the entire parking lot where the vehicle position exists (hereinafter “displayable as appropriate”). (Referred to as “maximum scale”). In response to this instruction, the HDD 20 compares the longitude and latitude of the outer peripheral portion of the predetermined range with the longitude and latitude of the four corners of the rectangular area included in the maximum displayable leaf data, and displays the maximum displayable scale. Of the leaf data, the leaf data that overlaps the predetermined range is read from the hard disk 22. The read leaf data is stored in the buffer memory 104.

  Next, the control unit 102 notifies the map drawing unit 106 of the vehicle position calculated in S101. The map drawing unit 106 reads out the leaf data stored in the buffer memory 104, and based on the leaf data, a rectangular map image corresponding to the screen of the display 70 having the notified vehicle position as the screen center position, That is, a map image of the maximum scale capable of displaying the entire parking lot where the vehicle position is present on the display 70 is generated and 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 appropriately synthesizes the map image from the map drawing unit 106 and the image generated by the operation screen / mark generation unit 108 and displays the obtained image on the display 70. (S106).

  When the map image of the maximum scale that can display the entire parking lot on the display 70 is displayed in S106, or the map image currently displayed on the display 70 at that time in S105 can display the entire parking lot. If it is determined that the maximum scale is the maximum scale, the control unit 102 reads the road information from the buffer memory 104, and the longitude of the exit included in the road information and the specific area information of the parking lot where the vehicle position exists. Based on the latitude and the vehicle position calculated in S101, a guide route from the vehicle position to the exit of the parking lot is set (S107). Information on the set guide route is stored in the guide route storage unit 110 together with the scale of the map image at that time.

  The guide route drawing unit 112 sets the vehicle position as the screen center position based on the guide route information stored in the guide route storage unit 110 and the scale of the map image at that time, and the guide route according to the scale. An image is generated and 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 generates a parking lot from the map image from the map drawing unit 106, the image generated by the operation screen / mark generation unit 108, and the vehicle position generated by the guidance route drawing unit 112. The image of the guide route to the exit of the vehicle is appropriately combined, and the obtained image is displayed on the display 70 (S108). Thereafter, the operations after the calculation of the vehicle position (S101) are repeated.

  FIG. 4 is a diagram illustrating a first example of map image transition in scale switching. When the vehicle position 201 exists in the parking lot 202, the exit cannot be grasped in the state before the scale switching shown in FIG. In such a case, the navigation device 100 according to the present embodiment switches the map image scale to the maximum scale that the entire parking lot 202 can display on the display 70 as shown in FIG. A route 203 to the exit of the parking lot 202 is displayed. Thus, when the vehicle position is in the parking lot, the navigation device 100 switches the scale of the map image to the maximum scale that the entire parking lot can display on the display 70, and further The route to the exit can be displayed, and the map image can be displayed at an appropriate scale considering the user's intention to escape from the parking lot. In addition, the specific area | region in the operation | movement of the flowchart shown in FIG. 3 is not limited to a parking lot, Other specific areas may be sufficient.

  FIG. 5 is a flowchart showing a second operation for switching the scale of a map image. The control unit 102 instructs the HDD 20 to read out map data corresponding to a predetermined range. Here, the predetermined range is assumed not only around the vehicle position but also various ones, and is specified by the longitude and latitude of the outer periphery of the predetermined range. In response to this instruction, the HDD 20 compares the longitude and latitude of the outer peripheral portion of the predetermined range with the longitude and latitude of the four corners of the rectangular region included in the leaf data, and stores the leaf data of the rectangular region overlapping the predetermined range. Read from the hard disk 22. Further, the HDD 20 reads the specific area information from the hard disk 22 (S201). The read map data including the map data and the specific area information is stored in the buffer memory 104.

  The map drawing unit 106 reads out the leaf data stored in the buffer memory 104, generates a rectangular map image corresponding to the screen of the display 70 based on the leaf data, and outputs the rectangular map 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 appropriately composes the map image from the map drawing unit 106 and the image at the cursor position generated by the operation screen / mark generation unit 108 and displays the obtained image on the display 70. (S202). Here, the image at the cursor position is displayed overlapping the image center position of the map image.

  Next, in the map image displayed on the display 70, the control unit 102 specifies the cursor position that moves in accordance with the operation of the operation unit 30 by the user by the longitude and latitude in the map image (S203). Specifically, the map drawing unit 106 notifies the control unit 102 of the longitude and latitude of the four corners of the rectangular map image generated in S202. The control unit 102 converts the image center position, which is the cursor position, into the longitude and latitude on the rectangular map image displayed on the display 70 based on the notified longitude and latitude of the four corners of the rectangular map image.

  Next, the control unit 102 reads specific area information stored in the buffer memory 104. Further, the control unit 102 compares the longitude and latitude indicating the cursor position in the map image displayed on the display 70 identified in S203 with the longitude and latitude of the outer periphery of the specific region included in the read specific region information. Then, it is determined whether the longitude and latitude indicating the cursor position in the map image displayed on the display 70 are within the specific area (S204). When the longitude and latitude indicating the cursor position are not within the specific area, the operation after the calculation of the vehicle position (S201) is repeated again.

  On the other hand, when the longitude and latitude indicating the cursor position are within the specific area, the control unit 102 displays the entire specific area where the map image currently displayed on the display 70 has the longitude and latitude indicating the cursor position. It is determined whether or not the scale is the maximum displayable size (S205). Specifically, substantially the same operation as S105 in FIG. 3 is performed. That is, the control unit 102 is notified from the map drawing unit 106 and is a specific region of a specific region where the longitude and latitude of the four corners of the rectangular map image displayed on the display 70 and the longitude and latitude indicating the cursor position are present. The longitude and latitude of the outer periphery of the specific area included in the information are compared, and it is determined whether or not the entire specific area is displayed on the display 70.

  When the entire specific area is not displayed on the display 70, the control unit 102 determines that the map image currently displayed on the display 70 is not the maximum scale that can display the entire specific area. On the other hand, when the entire specific area is displayed on the display 70, the control unit 102 further increases the scale set at that time by one step and increases the virtual rectangle displayed on the display 70. The longitude and latitude of the four corners of the map image are grasped. For example, when the scale is doubled, the virtual rectangular map image displayed on the display 70 corresponds to a region whose area is 1/4 with the longitude and latitude indicating the cursor position as the screen center position. It will be. Based on the relationship between the scale, the longitude and latitude indicating the cursor position, and the virtual rectangular map image displayed on the display 70, the control unit 102 increases the scale by one step. The longitude and latitude of the four corners of the displayed virtual rectangular map image can be grasped. Furthermore, when the scale is increased by one step, the control unit 102 determines the longitude and latitude of the four corners of the virtual rectangular map image displayed on the display 70 and the specific area where the longitude and latitude indicating the cursor position exist. The longitude and latitude of the outer periphery of the specific area included in the specific area information are compared, and it is determined whether or not the entire specific area is displayed on the display 70 when the scale is increased by one step. Even when the scale is increased by one step, if the entire specific area is displayed on the display 70, the map image currently displayed on the display 70 is the maximum scale that can display the entire specific area. It is determined that it is not. On the other hand, if the entire specific area is not displayed on the display 70 when the scale is increased by one step, the map image currently displayed on the display 70 is the maximum scale that can display the entire specific area. Is determined.

  When the map image currently displayed on the display 70 is not the maximum scale that can display the entire specific area, the control unit 102 displays the virtual rectangle displayed on the display 70 at each scale. The longitude and latitude of the four corners of the map image are grasped. Specifically, as described above, the control unit 102 determines the scale at each stage based on the relationship between the scale, the longitude and latitude indicating the cursor position, and the virtual rectangular map image displayed on the display 70. The longitude and latitude of the four corners of the virtual rectangular map image displayed on the display 70 can be grasped. Further, the control unit 102 specifies the specific area in which the longitude and latitude of the four corners of the virtual rectangular map image displayed on the display 70 and the longitude and latitude indicating the cursor position exist at each scale. The longitude and latitude of the outer periphery of the specific area included in the area information are compared, the scale that can be displayed on the display 70 by the entire specific area is specified, and the maximum scale among the specified scales is determined. Is specified as the maximum scale that can be displayed.

  Next, the control unit 102 corresponds to the predetermined range of longitude and latitude indicating the cursor position specified in S203 on the HDD 20 and can display the entire specific area where the longitude and latitude indicating the cursor position exist. Is instructed to read out the leaf data at the scale (maximum scale that can be displayed). In response to this instruction, the HDD 20 compares the longitude and latitude of the outer peripheral portion of the predetermined range with the longitude and latitude of the four corners of the rectangular area included in the maximum displayable leaf data, and displays the maximum displayable scale. Of the leaf data, the leaf data that overlaps the predetermined range is read from the hard disk 22. The read leaf data is stored in the buffer memory 104.

  Next, the control unit 102 notifies the map drawing unit 106 of the longitude and latitude indicating the cursor position specified in S203. The map drawing unit 106 reads the leaf data stored in the buffer memory 104 and, based on the leaf data, corresponds to the screen of the display 70 with the longitude and latitude indicating the notified cursor position as the screen center position. A rectangular map image, that is, a map image of the maximum scale capable of displaying the entire specific area where the longitude and latitude indicating the cursor position exist is generated and 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 appropriately composes the map image from the map drawing unit 106 and the image at the cursor position generated by the operation screen / mark generation unit 108 and displays the obtained image on the display 70. (S206).

  FIG. 6 is a diagram illustrating a second example of transition of map images in scale switching. When the cursor position 204 exists in the lake 205 which is a specific area, the cursor position 204 is in the lake 205 in the state before the scale switching shown in FIG. It is difficult to know where it is. In such a case, the navigation device 100 of the present embodiment switches the scale of the map image to the maximum scale that the entire lake 205 can display on the display 70, as shown in FIG. Thus, when the cursor position is within the specific area, the navigation device 100 can switch the scale of the map image to the maximum scale that the entire specific area can be displayed on the display 70. It is possible to display a map image at an appropriate scale considering the user's intention to grasp the cursor position.

  As described above, the map image display device and map image display method according to the present invention enable display of a map image at an appropriate scale considering the user's intention, and are useful as a map image display device and the like. is there.

It is a figure which shows the structure of a car navigation apparatus. It is a figure which shows an example of specific area information. It is a flowchart which shows the 1st operation | movement of scale reduction of a map image. It is a figure which shows the 1st example of the transition of the map image in scale switching. It is a flowchart which shows the 2nd operation | movement of scale reduction of a map image. It is a figure which shows the 2nd example of the transition of the map image in scale switching.

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 Car 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 118 Image composition part

Claims (4)

A map image display device for displaying a map image,
Vehicle position acquisition means for acquiring the position of the vehicle on which the map image display device is mounted;
Map data acquisition means for acquiring map data including area information of a specific area;
Based on the vehicle position acquired by the vehicle position acquisition means and the map data acquired by the map data acquisition means, a map image display process for performing processing for displaying a map image around the vehicle position on a display unit Means,
Position determining means for determining whether or not the vehicle position exists in the specific area based on the map data acquired by the map data acquiring means and the vehicle position acquired by the vehicle position acquiring means; ,
Scale switching means for switching the scale of a map image around the vehicle position displayed on the display unit when the position determination means determines that the vehicle position is within the specific area. A map image display device. The area information of the specific area includes position information of an exit of the specific area,
A route display for performing a process of displaying a route from the vehicle position to the exit of the specific area on the display unit based on the vehicle position acquired by the vehicle position acquisition means and the position information of the exit of the specific area The map image display device according to claim 1, further comprising a processing unit. A map image display device for displaying a map image,
Map data acquisition means for acquiring map data including area information of a specific area;
Map image display processing means for performing processing for displaying a map image on a display unit based on the map data acquired by the map data acquiring means;
Cursor position specifying means for specifying a cursor position on a map image displayed on the display unit;
Position determining means for determining whether or not the cursor position exists in the specific area based on the map data acquired by the map data acquiring means and the cursor position specified by the cursor position specifying means; ,
Scale switching means for switching the scale of a map image around the vehicle position displayed on the display unit when the position determination means determines that the cursor is present in the specific area. Map image display device.   The map image display according to any one of claims 1 to 3, wherein the scale switching means switches the scale of the map image to a maximum scale that can be displayed on the display unit as a whole of the specific area. apparatus.

Images