WO2015068542A1 - Display device for vehicle, image display method, and computer program - Google Patents

Display device for vehicle, image display method, and computer program Download PDF

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Publication number
WO2015068542A1
WO2015068542A1 PCT/JP2014/077400 JP2014077400W WO2015068542A1 WO 2015068542 A1 WO2015068542 A1 WO 2015068542A1 JP 2014077400 W JP2014077400 W JP 2014077400W WO 2015068542 A1 WO2015068542 A1 WO 2015068542A1
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WIPO (PCT)
Prior art keywords
unit
vehicle
map
information
road shape
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PCT/JP2014/077400
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French (fr)
Japanese (ja)
Inventor
泰永 丸山
健太 黒部
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日産自動車株式会社
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Publication of WO2015068542A1 publication Critical patent/WO2015068542A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3804—Creation or updating of map data
    • G01C21/3833—Creation or updating of map data characterised by the source of data
    • G01C21/3844—Data obtained from position sensors only, e.g. from inertial navigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3804—Creation or updating of map data
    • G01C21/3807—Creation or updating of map data characterised by the type of data
    • G01C21/3815—Road data
    • G01C21/3819—Road shape data, e.g. outline of a route
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3804—Creation or updating of map data
    • G01C21/3833—Creation or updating of map data characterised by the source of data
    • G01C21/3837—Data obtained from a single source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
    • G09B29/003—Maps
    • G09B29/006—Representation of non-cartographic information on maps, e.g. population distribution, wind direction, radiation levels, air and sea routes
    • G09B29/007—Representation of non-cartographic information on maps, e.g. population distribution, wind direction, radiation levels, air and sea routes using computer methods
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
    • G09B29/10—Map spot or coordinate position indicators; Map reading aids

Definitions

  • the present invention relates to a vehicle display device that displays a vehicle navigation image, an image display method, and a computer program.
  • a technique is known in which a navigation system and a display device in an instrument panel are connected by a communication path, and an intersection display image generated by the navigation system is transmitted to the display device in the instrument panel and displayed (Patent Document). 1).
  • the intersection display image is a simple image such as an arrow that indicates the direction of turning in the intersection, and is easier to see than the navigation system image, so that the driver can intuitively recognize the direction to proceed.
  • Patent Document 1 the intersection display image created by the navigation system is transmitted to the display device in a standard video format, for example. For this reason, it is necessary to connect the navigation system and the display device through a high-speed communication path for large-capacity image data communication. Since the high-speed communication path is expensive, there is a problem that the manufacturing cost of the vehicle increases.
  • the vehicle display device includes a navigation unit and a display unit.
  • the own vehicle position detection unit detects the position of the own vehicle, and the guidance intersection extraction unit extracts the guidance intersection existing on the route and the surrounding road shape information.
  • the map information transmission unit transmits the extracted road shape information to the display unit. Based on the road shape information, the map drawing unit draws a map image of the guidance intersection and its surroundings and displays it on the display.
  • FIG. 1 is a block diagram illustrating a configuration of a vehicle display device 1 according to the embodiment.
  • FIG. 2 is a flowchart for explaining the operation of the navigation unit 3.
  • FIG. 3 is a flowchart for explaining the operation of the navigation unit 3.
  • FIG. 4 is a flowchart for explaining the operation of the instrument panel display unit 5.
  • FIG. 5A is a table showing an example of link information constituting the map data format.
  • FIG. 5B is a table showing an example of node information constituting the map data format.
  • FIG. 5C is a table showing an example of POI information constituting the map data format.
  • FIG. 6 is a diagram illustrating an example of a map image of the guidance intersection displayed on the instrument panel display unit 5.
  • FIG. 5A is a table showing an example of link information constituting the map data format.
  • FIG. 5B is a table showing an example of node information constituting the map data format.
  • FIG. 5C is a table showing an example of POI information constituting
  • FIG. 7 is a table showing an example of node information constituting the map image shown in FIG.
  • FIG. 8A is a table showing the link information of Link [0] constituting the map image shown in FIG.
  • FIG. 8B is a table showing the link information of Link [1] constituting the map image shown in FIG.
  • FIG. 8C is a table showing the link information of Link [2] constituting the map image shown in FIG.
  • FIG. 8D is a table showing the link information of Link [3] constituting the map image shown in FIG.
  • FIG. 8E is a table showing the link information of Link [4] constituting the map image shown in FIG.
  • FIG. 8F is a table showing the link information of Link [5] constituting the map image shown in FIG. FIG.
  • FIG. 8G is a table showing the link information of Link [6] constituting the map image shown in FIG.
  • FIG. 9A is a diagram showing a map coordinate system displayed on the instrument panel display unit 5.
  • FIG. 9B is a conceptual diagram of coordinate data conversion with the drawing area of the instrument panel display unit 5.
  • FIG. 10A is a diagram illustrating a display example of the own vehicle mark VL indicating the position of the own vehicle.
  • FIG. 10B is a diagram showing a display example of the own vehicle mark VL following FIG. 10A.
  • FIG. 10C is a diagram showing a display example of the own vehicle mark VL following FIG. 10B.
  • FIG. 10D is a diagram showing a display example of the vehicle mark VL that follows FIG. 10C.
  • FIG. 10A is a diagram showing a map coordinate system displayed on the instrument panel display unit 5.
  • FIG. 9B is a conceptual diagram of coordinate data conversion with the drawing area of the instrument panel display unit 5.
  • FIG. 10A is a diagram illustrating
  • FIG. 11 is a table showing an example of the vehicle position information.
  • FIG. 12A is a diagram showing an example of a route (RT) from the position (DA) of the own vehicle to the destination (DB) set by the navigation unit 3.
  • FIG. 12B is a diagram illustrating an example of the node 40 and the link 41 drawn from the guidance intersection (B) on the route (RT) in FIG. 12A and the road shape information around it.
  • FIG. 12C is a diagram illustrating an example of the node 42 and the link 43 drawn from the guidance intersection (C) on the route (RT) in FIG. 12A and the road shape information around it.
  • FIG. 12D is a diagram illustrating an example of the node 44 and the link 45 drawn from the guidance intersection (D) on the route (RT) in FIG. 12A and the road shape information around it.
  • the vehicular display device 1 includes a navigation unit 3, an instrument panel display unit 5, and a communication path 19.
  • the navigation unit 3 is installed on the center console of the own vehicle together with a navigation map display device (not shown). Or the navigation part 3 may be installed under the seat of the driver's seat or passenger's seat of the own vehicle, and may be installed apart from the instrument panel display part 5.
  • the communication path 19 connects between the navigation unit 3 and the instrument panel display unit 5 that are installed separately.
  • the navigation unit 3 includes a GPS receiver 11, a map information storage unit 13, a guidance intersection extraction unit 15, and a map information transmission unit 17.
  • the GPS receiver 11 is an example of a vehicle position detection unit that receives a radio wave transmitted from a GPS (Global Positioning System) satellite and detects the position of the vehicle.
  • the position of the own vehicle is detected as, for example, three-dimensional data including latitude, longitude, and altitude.
  • the vehicle position detection unit may further include an inertial navigation device (not shown) in consideration of traffic in valleys of buildings, tunnels, and underground passages where the GPS receiver 11 cannot receive radio waves from GPS satellites.
  • the GPS receiver 11 detects the traveling direction of the host vehicle from the displacement of the position of the host vehicle at a predetermined time interval together with the detected latitude, longitude, and altitude.
  • the GPS receiver 11 collects information indicating latitude, longitude, altitude, and traveling direction, and outputs the information to the guidance intersection extraction unit 15 as own vehicle position information.
  • the map information storage unit 13 is a device that can read map information stored in a semiconductor memory, a DVD, a hard disk or the like as needed.
  • the map information storage unit 13 stores at least road shape information indicating the shape of the road on which the vehicle can travel as map information.
  • the map information storage unit 13 stores road shape information, facility information (POI Point of interest information) such as gas stations and convenience stores around the road, and building shape information around the road as map information. is doing.
  • the road shape information includes node information indicating the coordinates of a node, which is a point on the ground surface, and link information indicating a connection relationship between the nodes.
  • a node includes a complement point. That is, the map information storage unit 13 stores node information and link information as road shape information.
  • the building shape information stored in the map information storage unit 13 is surrounded by node information indicating the coordinates of the end points of the building, link information indicating the connection relationship between the end points, and a line connecting the end points, that is, links. And surface information indicating the area.
  • the navigation unit 3 calculates a route from the position of the vehicle detected by the GPS receiver 11 to a preset destination.
  • the vehicular display device 1 uses the voice and the map image to guide the vehicle along the route to the destination.
  • the guidance intersection extraction unit 15 extracts, from the map information storage unit 13, an intersection on the route on which the vehicle is to be guided (hereinafter referred to as “guidance intersection”) and road shape information around the intersection.
  • the guidance intersection includes, for example, an intersection to turn left and right, a branch point to two or more roads, and a junction of two or more roads.
  • the map information transmission unit 17 transmits the guidance intersection and the surrounding road shape information extracted by the guidance intersection extraction unit 15 to the instrument panel display unit 5.
  • the map information transmission unit 17 transmits the node information and the link information as road shape information, instead of transmitting the guidance intersection and its surrounding map as image data as in the prior art.
  • the bandwidth of the communication path 19 which connects between the map information transmission part 17 and the map information reception part 21 of the instrument panel display part 5 mentioned later may be narrow. That is, the conventional high-speed communication path for image data communication becomes unnecessary as the communication path 19.
  • the map information transmission unit 17 provides the map information reception unit 21 with its own vehicle position information indicating the position of the vehicle detected by the GPS receiver 11 and other information separately from the guidance intersection and the surrounding road shape information. Send instructions.
  • the instrument panel display unit 5 includes a map information receiving unit 21, a map drawing unit 23, a vehicle information detection unit 25, a vehicle information drawing unit 27, and a display 29.
  • the instrument panel display unit 5 is a general-purpose display device provided on the instrument panel, and is a display device that replaces analog meters such as a conventional speedometer.
  • the map information receiving unit 21 receives road shape information transmitted from the map information transmitting unit 17, that is, node information and link information. In addition to the road shape information, the map information receiving unit 21 receives the vehicle position information and other instructions transmitted by the map information transmitting unit 17.
  • the map drawing unit 23 draws the guidance intersection and its surrounding map image based on the road shape information (node information and link information) received by the map information receiving unit 21.
  • the map drawing unit 23 converts the map coordinate data of the node information and the link information into the screen coordinate data of the display device 29 in consideration of the display pixel number of the display device 29 held in advance when drawing the map image. And draw a map image. Details of this coordinate transformation will be described later.
  • the vehicle information detection unit 25 acquires vehicle information including at least speed information of the own vehicle from various sensors (not shown) attached to the own vehicle or an in-vehicle LAN (not shown) every predetermined time period (for example, 1 msec). .
  • the vehicle information detected or acquired by the vehicle information detection unit 25 further includes, for example, information indicating the engine speed, the remaining fuel amount, the water temperature, the travel distance, and the shift position in addition to the speed information of the host vehicle. May be.
  • the vehicle information drawing unit 27 draws a display image necessary for realizing an information display function as an instrument panel (or fascia) using the display device 29.
  • the vehicle information drawing unit 27 draws a display image of a speedometer having a display angle corresponding to the traveling speed of the vehicle based on the vehicle information detected by the vehicle information detection unit 25. Furthermore, if there is remaining fuel amount information, water temperature information, and shift position information as information detected or acquired by the vehicle information detection unit 25, display information such as a fuel gauge, a water temperature gauge, and a shift position is drawn.
  • the display device 29 is a flat display device such as a liquid crystal display device or an organic electroluminescence display device.
  • the display 29 displays at least the speed information of the vehicle as a speedometer, and displays the direction to travel at the guidance intersection on the map image in the vicinity of the guidance intersection.
  • FIGS. 2 and 3 show the operation of the navigation unit 3
  • FIG. 4 shows the operation of the instrument panel display unit 5.
  • the navigation unit 3 performs a series of procedures shown in the flowchart of FIG. 2 at predetermined time intervals or when a destination is set and the navigation unit 3 calculates a route from the current position of the vehicle to the destination. To run. As shown in FIG. 12A, the case where the route (RT) from the current position (DA) to the destination (DB) is set for the host vehicle parked at the point (DA) will be described as an example.
  • step (hereinafter, step is abbreviated as S) 10 the guided intersection extraction unit 15 selects all the intersections on the route.
  • the intersection includes not only a road shape where two or more roads intersect but also a junction where two or more roads merge and a branch point where two or more roads branch.
  • the guidance intersection extraction unit 15 determines whether there is a guidance intersection from the number of road branches at each intersection, the link angles before and after the intersection, and the like. When there is a guidance intersection, the guidance intersection extraction unit 15 extracts a guidance intersection from the selected intersections. From the route (RT) shown in FIG. 12A, the guidance intersections shown in FIGS. 12B, 12C, and 12D are extracted. If there is a guidance intersection, the process proceeds to S12. If there is no guided intersection, the flowchart of FIG. 2 ends.
  • the guidance intersection extraction unit 15 reads from the map information storage unit 13 the guidance intersection and road shape information within a predetermined distance from the guidance intersection so that the approaching direction to the guidance intersection is upward on the screen of the display 29.
  • 5A, 5B, and 5C show examples of the data format of the map information stored in the map information storage unit 13.
  • FIG. FIG. 6 is a diagram illustrating an example of a guidance intersection displayed on the instrument panel display unit 5 and a map image around it.
  • the data format of the map information includes link information shown in FIG. 5A, node information shown in FIG. 5B, and POI information shown in FIG. 5C.
  • link information includes Lin ID (unsigned integer (hereinafter abbreviated as UNIT), 8 bits), Link Type (UNIT, 8 bits), Road Type (UNIT, 8 bits), and a plurality of Nodes. It consists of ID (UNIT, 8bit).
  • Lin ID is an identification code for identifying a link.
  • Link Type indicates whether the link is a straight line (0: Straight) or a curve (1: Curve).
  • Road Type indicates whether the type of road indicated by the link is a main road (0: Main), a side road (1: Sub), or a route (2: Route).
  • the plurality of Node IDs included in the link information indicate a plurality of nodes to which the link is connected.
  • the node information includes Node ID (UNIT, 8 bits) which is a code for identifying the node, X (UNIT, 8 bits) indicating the X coordinate of the node, and Y (UNIT indicating the Y coordinate of the node). , 8bit).
  • POI information includes POI ID that is a code for identifying POI, POI Type that is a code that indicates the type of POI, and X (UNIT, 8 bits) that indicates the X coordinate of the POI display position.
  • Y (UNIT, 8 bits) indicating the Y coordinate of the POI display position.
  • the road shape map as shown in FIG. 6 is expressed using the node information shown in FIG. 7 and the link information shown in FIGS. 8A to 8G. That is, the map of FIG. 6 is defined by 19 nodes from node [0] to node [18] and 7 links from link [0] to link [6] connecting these nodes. . Note that the origin (0, 0) of the XY coordinates of the map of FIG. 6 is at the lower left end, and the size of the map is an actual distance 320 [m defined by the distance (0 to 256) on the horizontal coordinates.
  • FIG. 7 shows the node information of the nodes [0] to [18] in FIG. 6, and FIGS. 8A to 8G show the link information of the links [0] to [6] in FIG. ing.
  • the process proceeds to S14, and the map information transmission unit 17 transmits the shape information of the guidance intersection and the surrounding road to the map information reception unit 21.
  • an identification number of Map [N] is assigned for each guidance intersection and transmitted.
  • the process proceeds to S16, and the navigation unit 3 determines whether or not all the guidance intersections read in S12 and the road shape information around them have been transmitted. If there are remaining guidance intersections (YES in S16), the process returns to S12, and the next guidance intersection and its surrounding road shape information are similarly read out.
  • the plurality of guided intersections and the road shape information around them are assigned identification numbers (Map [N], Map [N + 1], Map [N + 2],...), And sequentially map information transmission unit 17. To the map information receiving unit 21.
  • the bandwidth of the communication path 19 may be narrow. That is, the communication path 19 can use a bus-type communication path provided in a normal vehicle such as an in-vehicle LAN or CAN, eliminates the need for an expensive high-speed communication path for image data communication, and increases the manufacturing cost of the vehicle. There is nothing to do.
  • the vehicle display device 1 transmits node information and link information from the navigation unit 3 to the instrument panel display unit 5 as the guidance intersection and the road shape information around it. For this reason, an accurate guidance intersection and its surrounding map image can be drawn and displayed by transmitting a small amount of data.
  • the flowchart of FIG. 3 is repeatedly executed at a predetermined time period.
  • the navigation unit 3 determines whether it is time to start displaying the guidance intersection. For example, the navigation unit 3 determines whether it is a time to start display based on the distance from the vehicle to the guidance intersection and the speed of the vehicle. Specifically, assuming that the current vehicle speed is maintained up to the guidance intersection, the time until the own vehicle reaches the guidance intersection is equal to or less than a predetermined threshold time, and the display start time What is necessary is just to judge. Note that the threshold time may be changed according to the type of road being traveled (general road or highway). If it is determined that it is time to start display (YES in S30), the process proceeds to S32. If it is determined that it is not time to start display, the flowchart of FIG. 3 ends.
  • the navigation unit 3 transmits a command (display start instruction) for instructing display start of the map image to the instrument panel display unit 5 together with the identification number (for example, Map [N]).
  • the instrument panel display unit 5 uses the identification number (for example, Map [N]) to start the display of the road shape from the guidance intersection and its surrounding road shape information transmitted in advance by the operation shown in FIG. Information can be specified.
  • the navigation unit 3 displays the vehicle position information indicating the current position of the vehicle around the guidance intersection based on the latest information on the position of the vehicle obtained from the GPS receiver 11 on the instrument panel display unit 5.
  • the vehicle position information includes Direction (UNIT, 8 bits) indicating the direction of travel of the vehicle, X (UNIT, 8 bits) as the X coordinate, Y (UNIT, 8 bits) as the Y coordinate, and the guidance intersection.
  • DTI (UNIT, 8 bits) that is the distance is included.
  • the navigation unit 3 determines whether or not the vehicle has passed the guidance intersection from the position of the vehicle and the position of the guidance intersection.
  • the map information transmission unit 17 transmits a command (display end instruction) for terminating the display of the map image to the instrument panel display unit 5 (YES in S36). Then, the flowchart of FIG. 3 ends.
  • the process returns to S34, and the position of the host vehicle is updated and transmitted to the instrument panel display unit 5.
  • the map information receiving unit 21 is on standby to receive the guidance intersection and its surrounding road shape information.
  • the map information receiving unit 21 receives the road shape information (YES in S70)
  • the map information receiving unit 21 transfers the road shape information to the map drawing unit 23, and proceeds to S72.
  • the map drawing unit 23 performs coordinate conversion and draws a map image for each identification number (for example, Map [N]) attached to the road shape information. Specifically, map coordinate data composed of node information and link information is converted into screen coordinate data of the display 29, and a map image is drawn. The drawn map image data is stored in an image buffer in the map drawing unit 23. In this way, the map drawing unit 23 draws and stores the guidance intersection and its surrounding map image based on the road shape information in advance. For this reason, when a display start instruction is received from the navigation unit 3 in S32 of FIG. 3, a map image can be quickly displayed on the display device 29.
  • Map [N] for example, Map [N]
  • FIG. 9A shows a map coordinate system of road shape information transmitted from the map information transmitting unit 17 and received by the map information receiving unit 21.
  • FIG. 9B shows a screen drawing area of a map image drawn by the map drawing unit 23 and output to the display device 29.
  • the process proceeds to S74.
  • the instrument panel display unit 5 waits to receive a display start instruction (S32 in FIG. 3) from the navigation unit 3.
  • a display start instruction is received from the navigation unit 3 (YES in S74)
  • the process proceeds to S76.
  • the map drawing unit 23 selects the map image stored in the image buffer according to the identification number (for example, Map [N]) included in the display start instruction, and outputs the map image to the display device 29. Thereby, the guidance intersection and the map image around it are displayed on the display device 29.
  • the instrument panel display unit 5 waits for the vehicle position information to be transmitted from the navigation unit 3.
  • the instrument panel display unit 5 receives the vehicle position information (YES in S78), the process proceeds to S80.
  • the map drawing unit 23 draws the vehicle mark indicating the position of the vehicle according to the vehicle position information (Direction, X, Y, DTI) on the intersection and the surrounding map image displayed in S76. To do. And the indicator 29 displays the intersection and the map image of the circumference
  • vehicle position information Direction, X, Y, DTI
  • FIGS. 10A to 10D are diagrams showing display examples of the map image and the vehicle mark VL.
  • the own vehicle mark VL is an isosceles triangle, and the direction of the apex indicates the vehicle traveling direction.
  • the position of the host vehicle mark VL changes on the same map image in the order of FIGS. 10A, 10B, 10C, and 10D as the host vehicle progresses.
  • the own vehicle mark VL is already displayed on the same map image according to the processing operation shown in FIG. 4, at the next processing operation, the previously displayed own vehicle mark is deleted and the newly received own vehicle position information is displayed.
  • the display position of the vehicle mark VL is updated according to the above.
  • the map information transmission unit 17 obtains the vehicle position information indicating the position of the vehicle detected by the GPS receiver 11 separately from the road shape information extracted by the guidance intersection extraction unit 15. To 21. Thereby, the transmission of the guidance intersection and the surrounding road shape information can be separated from the transmission of the vehicle position information. Accordingly, the same map information shown in FIGS. 10A to 10D is not repeatedly transmitted every predetermined time period, so that the amount of information transmitted through the communication path 19 is reduced, and an accurate map image and sometimes It is possible to display the position of the vehicle that changes every moment on the display 29.
  • the instrument panel display unit 5 waits to receive a display end instruction (S36 in FIG. 3) from the navigation unit 3.
  • a display end instruction (S36 in FIG. 3)
  • the instrument panel display unit 5 erases the map around the guidance intersection displayed in S76 and the vehicle mark indicating the vehicle position displayed in S80, and returns to S70. .
  • the navigation unit 3 extracts the guidance intersection and its surrounding road shape information and transmits it to the instrument panel display unit 5, and the instrument panel display unit 5 guides based on the received road shape information.
  • the map image of the intersection is drawn and displayed. For this reason, it is not necessary to provide a high-speed communication path for transmitting a map image between the navigation unit 3 and the instrument panel display unit 5. Thereby, an expensive high-speed communication path becomes unnecessary, and an increase in manufacturing cost can be prevented.
  • a microcontroller including a CPU, a memory, and an input / output unit can be used.
  • the microcontroller configures a plurality of information processing units (15, 17, 21, 23, 27) shown in FIG. 1 by executing a computer program installed in advance.
  • the computer program applied to the vehicle display device 1 is one of other embodiments of the present invention.
  • the navigation unit 3 and the instrument panel display unit 5 in FIG. 1 are configured by different microcontrollers, and both the microcontrollers are connected by a communication path 19.
  • the microcontroller draws and displays the map image and the vehicle mark VL from the information acquired by the GPS receiver 11, the map information storage unit 13, and the vehicle information detection unit 25 in accordance with the procedure shown in FIGS.
  • the information processing is executed.
  • the microcontroller may also be used as another microcontroller used for other control related to the vehicle.

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Abstract

　A display device (1) for a vehicle is provided with a navigation unit (3) and an instrument panel display unit (5). A GPS receiver (11) detects the position of a host vehicle, and a guidance intersection extraction unit (15) extracts guidance intersections present on a route (RT) and road shape information of the area thereof. A map information transmission unit (17) transmits the extracted road shape information to a map information receiving unit (21). A map-drawing unit (23) draws a map image of the guidance intersections and the area thereof on the basis of the road shape information, superimposes a host vehicle mark on the map image, and displays the result on a display apparatus (29).

Description

車両用表示装置、画像表示方法、及びコンピュータプログラムVehicle display device, image display method, and computer program
　本発明は、車両用ナビゲーション画像を表示する車両用表示装置、画像表示方法、及びコンピュータプログラムに関するものである。 The present invention relates to a vehicle display device that displays a vehicle navigation image, an image display method, and a computer program.
　ナビゲーションシステムとインストルメントパネル内の表示装置とを通信路で接続して、ナビゲーションシステムで生成した交差点表示画像をインストルメントパネル内の表示装置へ送信して表示する技術が知られている（特許文献１）。交差点表示画像は、交差点内で曲がる方向を矢印などの簡易画像で示すもので、ナビゲーションシステムの画像よりも見やすく、運転者は直感的に進むべき方向を認識できる。 A technique is known in which a navigation system and a display device in an instrument panel are connected by a communication path, and an intersection display image generated by the navigation system is transmitted to the display device in the instrument panel and displayed (Patent Document). 1). The intersection display image is a simple image such as an arrow that indicates the direction of turning in the intersection, and is easier to see than the navigation system image, so that the driver can intuitively recognize the direction to proceed.
米国特許第７３３３８８８号US Pat. No. 7,333,888
　しかしながら、特許文献１において、ナビゲーションシステムが作成した交差点表示画像は、例えば、標準のビデオフォーマットで表示装置へ送信される。このため、ナビゲーションシステムと表示装置との間を、大容量の画像データ通信用の高速通信路で接続する必要がある。高速通信路は高価であるために、車両の製造コストが増加するという問題点があった。 However, in Patent Document 1, the intersection display image created by the navigation system is transmitted to the display device in a standard video format, for example. For this reason, it is necessary to connect the navigation system and the display device through a high-speed communication path for large-capacity image data communication. Since the high-speed communication path is expensive, there is a problem that the manufacturing cost of the vehicle increases.
　本発明の一態様に係わる車両用表示装置は、ナビゲーション部と、表示部とを備える。自車位置検出部は自車の位置を検出し、誘導交差点抽出部は、経路上に存在する誘導交差点及びその周囲の道路形状情報を抽出する。地図情報送信部は、抽出された道路形状情報を表示部へ送信する。地図描画部は、道路形状情報に基づいて、誘導交差点及びその周囲の地図画像を描画し、表示器に表示する。 The vehicle display device according to one aspect of the present invention includes a navigation unit and a display unit. The own vehicle position detection unit detects the position of the own vehicle, and the guidance intersection extraction unit extracts the guidance intersection existing on the route and the surrounding road shape information. The map information transmission unit transmits the extracted road shape information to the display unit. Based on the road shape information, the map drawing unit draws a map image of the guidance intersection and its surroundings and displays it on the display.
図１は、実施形態に係る車両用表示装置１の構成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of a vehicle display device 1 according to the embodiment. 図２は、ナビゲーション部３の動作を説明するフローチャートである。FIG. 2 is a flowchart for explaining the operation of the navigation unit 3. 図３は、ナビゲーション部３の動作を説明するフローチャートである。FIG. 3 is a flowchart for explaining the operation of the navigation unit 3. 図４は、インストルメントパネル表示部５の動作を説明するフローチャートである。FIG. 4 is a flowchart for explaining the operation of the instrument panel display unit 5. 図５Ａは、地図データフォーマットを構成するリンク情報の一例を示す表である。FIG. 5A is a table showing an example of link information constituting the map data format. 図５Ｂは、地図データフォーマットを構成するノード情報の一例を示す表である。FIG. 5B is a table showing an example of node information constituting the map data format. 図５Ｃは、地図データフォーマットを構成するＰＯＩ情報の一例を示す表である。FIG. 5C is a table showing an example of POI information constituting the map data format. 図６は、インストルメントパネル表示部５に表示される誘導交差点の地図画像の例を示す図である。FIG. 6 is a diagram illustrating an example of a map image of the guidance intersection displayed on the instrument panel display unit 5. 図７は、図６に示す地図画像を構成するノード情報の例を示す表である。FIG. 7 is a table showing an example of node information constituting the map image shown in FIG. 図８Ａは、図６に示す地図画像を構成するLink[0]のリンク情報を示す表である。FIG. 8A is a table showing the link information of Link [0] constituting the map image shown in FIG. 図８Ｂは、図６に示す地図画像を構成するLink[1]のリンク情報を示す表である。FIG. 8B is a table showing the link information of Link [1] constituting the map image shown in FIG. 図８Ｃは、図６に示す地図画像を構成するLink[2]のリンク情報を示す表である。FIG. 8C is a table showing the link information of Link [2] constituting the map image shown in FIG. 図８Ｄは、図６に示す地図画像を構成するLink[3]のリンク情報を示す表である。FIG. 8D is a table showing the link information of Link [3] constituting the map image shown in FIG. 図８Ｅは、図６に示す地図画像を構成するLink[4]のリンク情報を示す表である。FIG. 8E is a table showing the link information of Link [4] constituting the map image shown in FIG. 図８Ｆは、図６に示す地図画像を構成するLink[5]のリンク情報を示す表である。FIG. 8F is a table showing the link information of Link [5] constituting the map image shown in FIG. 図８Ｇは、図６に示す地図画像を構成するLink[6]のリンク情報を示す表である。FIG. 8G is a table showing the link information of Link [6] constituting the map image shown in FIG. 図９Ａは、インストルメントパネル表示部５に表示される地図座標系を示す図である。FIG. 9A is a diagram showing a map coordinate system displayed on the instrument panel display unit 5. 図９Ｂは、インストルメントパネル表示部５の描画エリアとの座標データ変換の概念図である。FIG. 9B is a conceptual diagram of coordinate data conversion with the drawing area of the instrument panel display unit 5. 図１０Ａは、自車の位置を示す自車マークＶＬの表示例を示す図である。FIG. 10A is a diagram illustrating a display example of the own vehicle mark VL indicating the position of the own vehicle. 図１０Ｂは、図１０Ａの後に続く自車マークＶＬの表示例を示す図である。FIG. 10B is a diagram showing a display example of the own vehicle mark VL following FIG. 10A. 図１０Ｃは、図１０Ｂの後に続く自車マークＶＬの表示例を示す図である。FIG. 10C is a diagram showing a display example of the own vehicle mark VL following FIG. 10B. 図１０Ｄは、図１０Ｃの後に続く自車マークＶＬの表示例を示す図である。FIG. 10D is a diagram showing a display example of the vehicle mark VL that follows FIG. 10C. 図１１は、自車位置情報の例を示す表である。FIG. 11 is a table showing an example of the vehicle position information. 図１２Ａは、ナビゲーション部３により設定された、自車の位置（ＤＡ）から目的地（ＤＢ）までの経路（ＲＴ）の例を示す図である。FIG. 12A is a diagram showing an example of a route (RT) from the position (DA) of the own vehicle to the destination (DB) set by the navigation unit 3. 図１２Ｂは、図１２Ａの経路（ＲＴ）上にある誘導交差点（Ｂ）及びその周囲の道路形状情報から描画されるノード４０及びリンク４１の例を示す図である。FIG. 12B is a diagram illustrating an example of the node 40 and the link 41 drawn from the guidance intersection (B) on the route (RT) in FIG. 12A and the road shape information around it. 図１２Ｃは、図１２Ａの経路（ＲＴ）上にある誘導交差点（Ｃ）及びその周囲の道路形状情報から描画されるノード４２及びリンク４３の例を示す図である。FIG. 12C is a diagram illustrating an example of the node 42 and the link 43 drawn from the guidance intersection (C) on the route (RT) in FIG. 12A and the road shape information around it. 図１２Ｄは、図１２Ａの経路（ＲＴ）上にある誘導交差点（Ｄ）及びその周囲の道路形状情報から描画されるノード４４及びリンク４５の例を示す図である。FIG. 12D is a diagram illustrating an example of the node 44 and the link 45 drawn from the guidance intersection (D) on the route (RT) in FIG. 12A and the road shape information around it.
　次に、図面を参照して、本発明の実施の形態を詳細に説明する。図１を参照して、実施形態に係わる車両用表示装置１の構成を説明する。図１において、車両用表示装置１は、ナビゲーション部３と、インストルメントパネル表示部５と、通信路１９とを備えている。 Next, embodiments of the present invention will be described in detail with reference to the drawings. With reference to FIG. 1, the structure of the display apparatus 1 for vehicles concerning embodiment is demonstrated. In FIG. 1, the vehicular display device 1 includes a navigation unit 3, an instrument panel display unit 5, and a communication path 19.
　ナビゲーション部３は、ナビゲーション用地図表示装置（図示せず）と一体となって自車のセンターコンソール上に設置されている。又は、ナビゲーション部３は、自車の運転席或いは助手席のシート下に設置され、インストルメントパネル表示部５から離れて設置されていてもよい。通信路１９は、離れて設置されたナビゲーション部３及びインストルメントパネル表示部５との間を接続する。 The navigation unit 3 is installed on the center console of the own vehicle together with a navigation map display device (not shown). Or the navigation part 3 may be installed under the seat of the driver's seat or passenger's seat of the own vehicle, and may be installed apart from the instrument panel display part 5. The communication path 19 connects between the navigation unit 3 and the instrument panel display unit 5 that are installed separately.
　ナビゲーション部３は、ＧＰＳ受信機１１と、地図情報格納部１３と、誘導交差点抽出部１５と、地図情報送信部１７とを備える。ＧＰＳ受信機１１は、ＧＰＳ(Global Positioning System）衛星から送信される電波を受信して、自車の位置を検出する自車位置検出部の一例である。なお、自車の位置は、例えば、緯度、経度、高度からなる３次元データとして検出される。また、自車位置検出部は、ＧＰＳ受信機１１がＧＰＳ衛星の電波を受信できないビルの谷間やトンネル、地下道等の通行を考慮して、図示しない慣性航法装置を更に備えていてもよい。ＧＰＳ受信機１１は、検出した緯度、経度、高度とともに、所定の時間間隔における自車の位置の変位から自車の進行方向を検出する。ＧＰＳ受信機１１は、緯度、経度、高度、及び進行方向を示す情報を纏めて、自車位置情報として、誘導交差点抽出部１５へ出力する。 The navigation unit 3 includes a GPS receiver 11, a map information storage unit 13, a guidance intersection extraction unit 15, and a map information transmission unit 17. The GPS receiver 11 is an example of a vehicle position detection unit that receives a radio wave transmitted from a GPS (Global Positioning System) satellite and detects the position of the vehicle. In addition, the position of the own vehicle is detected as, for example, three-dimensional data including latitude, longitude, and altitude. In addition, the vehicle position detection unit may further include an inertial navigation device (not shown) in consideration of traffic in valleys of buildings, tunnels, and underground passages where the GPS receiver 11 cannot receive radio waves from GPS satellites. The GPS receiver 11 detects the traveling direction of the host vehicle from the displacement of the position of the host vehicle at a predetermined time interval together with the detected latitude, longitude, and altitude. The GPS receiver 11 collects information indicating latitude, longitude, altitude, and traveling direction, and outputs the information to the guidance intersection extraction unit 15 as own vehicle position information.
　地図情報格納部１３は、半導体メモリやＤＶＤ、ハードディスク等に格納された地図情報を、随時読み出し可能とした装置である。地図情報格納部１３は、地図情報として、自車が走行可能な道路の形状を示す道路形状情報を少なくとも記憶する。本実施形態で、地図情報格納部１３は、地図情報として、道路形状情報と、道路周辺のガソリンスタンドやコンビニエンスストア等の施設情報（ＰＯＩ Point of interest情報）と、道路周辺の建物形状情報を記憶している。道路形状情報は、地表上の点であるノードの座標を示すノード情報と、ノード間の接続関係を示すリンク情報とを含む。なお、ノードには補完点が含まれる。つまり、地図情報格納部１３は、道路形状情報として、ノード情報とリンク情報とを記憶している。また、地図情報格納部１３が格納する建物形状情報は、建物の端点の座標を示すノード情報と、端点間の接続関係を示すリンク情報と、端点間を接続する線、つまりリンクで囲まれた領域を示す面情報とから構成される。 The map information storage unit 13 is a device that can read map information stored in a semiconductor memory, a DVD, a hard disk or the like as needed. The map information storage unit 13 stores at least road shape information indicating the shape of the road on which the vehicle can travel as map information. In this embodiment, the map information storage unit 13 stores road shape information, facility information (POI Point of interest information) such as gas stations and convenience stores around the road, and building shape information around the road as map information. is doing. The road shape information includes node information indicating the coordinates of a node, which is a point on the ground surface, and link information indicating a connection relationship between the nodes. A node includes a complement point. That is, the map information storage unit 13 stores node information and link information as road shape information. The building shape information stored in the map information storage unit 13 is surrounded by node information indicating the coordinates of the end points of the building, link information indicating the connection relationship between the end points, and a line connecting the end points, that is, links. And surface information indicating the area.
　ナビゲーション部３は、ＧＰＳ受信機１１により検出された自車の位置から、予め設定された目的地までの経路を算出する。車両用表示装置１は、音声及び地図画像を用いて、自車を経路に沿って目的地まで誘導する。誘導交差点抽出部１５は、経路上に存在する、自車を誘導すべき交差点（以後、「誘導交差点」と呼ぶ）及びその周囲の道路形状情報を地図情報格納部１３から抽出する。誘導交差点には、たとえば、右左折すべき交差点、２以上の道路への分岐点、２つ以上の道路の合流点が含まれる。 The navigation unit 3 calculates a route from the position of the vehicle detected by the GPS receiver 11 to a preset destination. The vehicular display device 1 uses the voice and the map image to guide the vehicle along the route to the destination. The guidance intersection extraction unit 15 extracts, from the map information storage unit 13, an intersection on the route on which the vehicle is to be guided (hereinafter referred to as “guidance intersection”) and road shape information around the intersection. The guidance intersection includes, for example, an intersection to turn left and right, a branch point to two or more roads, and a junction of two or more roads.
　地図情報送信部１７は、誘導交差点抽出部１５により抽出された、誘導交差点及びその周囲の道路形状情報をインストルメントパネル表示部５へ送信する。地図情報送信部１７は、従来のように、誘導交差点及びその周囲の地図を画像データとして送信するのではなく、道路形状情報としてノード情報及びリンク情報を送信する。このため、地図情報送信部１７と、後述するインストルメントパネル表示部５の地図情報受信部２１との間を接続する通信路１９の帯域幅は狭くてもよい。即ち、通信路１９として、従来のような画像データ通信用の高速通信路が不要となる。通信路１９としては、たとえば、車載ＬＡＮ（Local Area Network）やＣＡＮ（Controller Area Network）などの通常車両に設けられているバス型の通信路を利用可能である。地図情報送信部１７は、地図情報受信部２１に対して、誘導交差点及びその周囲の道路形状情報とは別に、ＧＰＳ受信機１１により検出された自車の位置を示す自車位置情報及びその他の指示を送信する。 The map information transmission unit 17 transmits the guidance intersection and the surrounding road shape information extracted by the guidance intersection extraction unit 15 to the instrument panel display unit 5. The map information transmission unit 17 transmits the node information and the link information as road shape information, instead of transmitting the guidance intersection and its surrounding map as image data as in the prior art. For this reason, the bandwidth of the communication path 19 which connects between the map information transmission part 17 and the map information reception part 21 of the instrument panel display part 5 mentioned later may be narrow. That is, the conventional high-speed communication path for image data communication becomes unnecessary as the communication path 19. As the communication path 19, for example, a bus-type communication path provided in a normal vehicle such as an in-vehicle LAN (Local Area Network) or a CAN (Controller Area Network) can be used. The map information transmission unit 17 provides the map information reception unit 21 with its own vehicle position information indicating the position of the vehicle detected by the GPS receiver 11 and other information separately from the guidance intersection and the surrounding road shape information. Send instructions.
　インストルメントパネル表示部５は、地図情報受信部２１と、地図描画部２３と、車両情報検出部２５と、車両情報描画部２７と、表示器２９とを備えている。インストルメントパネル表示部５は、インストルメントパネルに設けられた汎用表示装置であり、従来の速度計などのアナログメータ類に代わる表示装置である。地図情報受信部２１は、地図情報送信部１７から送信される道路形状情報、すなわちノード情報及びリンク情報を受信する。また、地図情報受信部２１は、道路形状情報とは別に、地図情報送信部１７により送信される自車位置情報及びその他の指示を受信する。 The instrument panel display unit 5 includes a map information receiving unit 21, a map drawing unit 23, a vehicle information detection unit 25, a vehicle information drawing unit 27, and a display 29. The instrument panel display unit 5 is a general-purpose display device provided on the instrument panel, and is a display device that replaces analog meters such as a conventional speedometer. The map information receiving unit 21 receives road shape information transmitted from the map information transmitting unit 17, that is, node information and link information. In addition to the road shape information, the map information receiving unit 21 receives the vehicle position information and other instructions transmitted by the map information transmitting unit 17.
　地図描画部２３は、地図情報受信部２１により受信された道路形状情報（ノード情報及びリンク情報）に基づいて、誘導交差点及びその周囲の地図画像を描画する。地図描画部２３は、地図画像を描画する際に、予め保持している表示器２９の表示画素数を考慮して、ノード情報及びリンク情報の地図座標データを表示器２９の画面座標データに変換して、地図画像を描画する。この座標変換の詳細は、後述する。 The map drawing unit 23 draws the guidance intersection and its surrounding map image based on the road shape information (node information and link information) received by the map information receiving unit 21. The map drawing unit 23 converts the map coordinate data of the node information and the link information into the screen coordinate data of the display device 29 in consideration of the display pixel number of the display device 29 held in advance when drawing the map image. And draw a map image. Details of this coordinate transformation will be described later.
　車両情報検出部２５は、所定の時間周期（例えば、１msec）毎に、自車に取り付けられた図示しない各種センサや、図示しない車載ＬＡＮから、少なくとも自車の速度情報を含む車両情報を取得する。車両情報検出部２５が検出または取得する車両情報には、自車の速度情報の他に、例えば、エンジンの回転数、燃料残量、水温、走行距離、シフトポジションを示す情報が更に含まれていてもよい。 The vehicle information detection unit 25 acquires vehicle information including at least speed information of the own vehicle from various sensors (not shown) attached to the own vehicle or an in-vehicle LAN (not shown) every predetermined time period (for example, 1 msec). . The vehicle information detected or acquired by the vehicle information detection unit 25 further includes, for example, information indicating the engine speed, the remaining fuel amount, the water temperature, the travel distance, and the shift position in addition to the speed information of the host vehicle. May be.
　車両情報描画部２７は、インストルメントパネル（又はフェイシア）としての情報表示機能を、表示器２９を用いて実現するために必要な表示画像を描画する。車両情報描画部２７は、車両情報検出部２５が検出した車両情報に基づいて、車両の走行速度に応じた表示角度を有する速度計の表示画像を描画する。さらに、車両情報検出部２５が検出または取得する情報として、燃料残量情報、水温情報、シフトポジション情報があれば、燃料計、水温計、シフトポジション等の表示情報の描画を行う。 The vehicle information drawing unit 27 draws a display image necessary for realizing an information display function as an instrument panel (or fascia) using the display device 29. The vehicle information drawing unit 27 draws a display image of a speedometer having a display angle corresponding to the traveling speed of the vehicle based on the vehicle information detected by the vehicle information detection unit 25. Furthermore, if there is remaining fuel amount information, water temperature information, and shift position information as information detected or acquired by the vehicle information detection unit 25, display information such as a fuel gauge, a water temperature gauge, and a shift position is drawn.
　表示器２９は、液晶表示装置や有機エレクトロルミネッセンス表示装置などの平面表示装置である。表示器２９は、少なくとも車両の速度情報を速度計として表示するとともに、誘導交差点の近傍では、誘導交差点において進行すべき方向を地図画像上に表示する。 The display device 29 is a flat display device such as a liquid crystal display device or an organic electroluminescence display device. The display 29 displays at least the speed information of the vehicle as a speedometer, and displays the direction to travel at the guidance intersection on the map image in the vicinity of the guidance intersection.
　次に、図２～図４のフローチャートを参照して、本実施形態の車両用表示装置１を用いた画像表示方法を説明する。図２及び図３は、ナビゲーション部３の動作を示し、図４は、インストルメントパネル表示部５の動作を示す。 Next, an image display method using the vehicle display device 1 of the present embodiment will be described with reference to the flowcharts of FIGS. 2 and 3 show the operation of the navigation unit 3, and FIG. 4 shows the operation of the instrument panel display unit 5.
　ナビゲーション部３は、図２のフローチャートに示す一連の手順を、所定の時間周期毎、或いは、目的地が設定され、ナビゲーション部３が現在の自車の位置から目的地までの経路を算出したときに実行する。図１２Ａのように、地点（ＤＡ）に駐車中の自車に対して、現在位置（ＤＡ）から目的地（ＤＢ）までの経路（ＲＴ）が設定された場合を例にとり説明する。 The navigation unit 3 performs a series of procedures shown in the flowchart of FIG. 2 at predetermined time intervals or when a destination is set and the navigation unit 3 calculates a route from the current position of the vehicle to the destination. To run. As shown in FIG. 12A, the case where the route (RT) from the current position (DA) to the destination (DB) is set for the host vehicle parked at the point (DA) will be described as an example.
　先ずステップ（以下、ステップをＳと略す）１０において、誘導交差点抽出部１５は、経路上にある全ての交差点を選択する。なお、交差点には、２以上の道路が交差する道路形状のみにならず、２以上の道路が合流する合流点、２以上の道路へ分岐する分岐点が含まれる。そして、誘導交差点抽出部１５は、各交差点における道路の分岐数、交差点前後のリンク角度などから、誘導交差点があるか否かを判断する。誘導交差点が有る場合、誘導交差点抽出部１５は、選択された交差点の中から、誘導交差点を抽出する。図１２Ａに示す経路（ＲＴ）から、図１２Ｂ、図１２Ｃ、及び図１２Ｄに示す誘導交差点を抽出する。誘導交差点が有る場合、Ｓ１２へ進む。誘導交差点がない場合、図２のフローチャートは、終了する。 First, in step (hereinafter, step is abbreviated as S) 10, the guided intersection extraction unit 15 selects all the intersections on the route. In addition, the intersection includes not only a road shape where two or more roads intersect but also a junction where two or more roads merge and a branch point where two or more roads branch. Then, the guidance intersection extraction unit 15 determines whether there is a guidance intersection from the number of road branches at each intersection, the link angles before and after the intersection, and the like. When there is a guidance intersection, the guidance intersection extraction unit 15 extracts a guidance intersection from the selected intersections. From the route (RT) shown in FIG. 12A, the guidance intersections shown in FIGS. 12B, 12C, and 12D are extracted. If there is a guidance intersection, the process proceeds to S12. If there is no guided intersection, the flowchart of FIG. 2 ends.
　Ｓ１２において、誘導交差点抽出部１５は、誘導交差点への進入方向が表示器２９の画面で上向きとなるように、誘導交差点及び誘導交差点から所定距離以内の道路形状情報を地図情報格納部１３から読み出す。図５Ａ、図５Ｂ、図５Ｃは、地図情報格納部１３が格納している地図情報のデータフォーマット例を示す。図６は、インストルメントパネル表示部５に表示される誘導交差点及びその周囲の地図画像の例を示す図である。 In S12, the guidance intersection extraction unit 15 reads from the map information storage unit 13 the guidance intersection and road shape information within a predetermined distance from the guidance intersection so that the approaching direction to the guidance intersection is upward on the screen of the display 29. . 5A, 5B, and 5C show examples of the data format of the map information stored in the map information storage unit 13. FIG. FIG. 6 is a diagram illustrating an example of a guidance intersection displayed on the instrument panel display unit 5 and a map image around it.
　地図情報のデータフォーマットは、図５Ａに示すリンク（Ｌｉｎｋ）情報と、図５Ｂに示すノード（Ｎｏｄｅ）情報と、図５Ｃに示すＰＯＩ情報とを含む。図５Ａに示すように、リンク情報は、Lin ID（符号なし整数（以下、UNITと略す），８bit ）と、Link Type（UNIT,８bit）と、Road Type（UNIT,８bit）と、複数のNode ID（UNIT,８bit）とからなる。Lin IDは、リンクを識別するための識別符号である。Link Typeは、リンクが直線（０：Straight）であるか曲線（１：Curve）であるかを示す。Road Typeは、リンクが示す道路の種類が、主要道（０:Main）であるか、脇道（１：Sub）か、経路（２：Route）かを示す。リンク情報に含まれる複数のNode IDは、リンクが接続する複数のノードを示す。 The data format of the map information includes link information shown in FIG. 5A, node information shown in FIG. 5B, and POI information shown in FIG. 5C. As shown in FIG. 5A, link information includes Lin ID (unsigned integer (hereinafter abbreviated as UNIT), 8 bits), Link Type (UNIT, 8 bits), Road Type (UNIT, 8 bits), and a plurality of Nodes. It consists of ID (UNIT, 8bit). Lin ID is an identification code for identifying a link. Link Type indicates whether the link is a straight line (0: Straight) or a curve (1: Curve). Road Type indicates whether the type of road indicated by the link is a main road (0: Main), a side road (1: Sub), or a route (2: Route). The plurality of Node IDs included in the link information indicate a plurality of nodes to which the link is connected.
　図５Ｂに示すように、ノード情報は、ノードを識別する符号であるNode ID（UNIT,８bit）と、ノードのＸ座標を示すＸ（UNIT,８bit）と、ノードのＹ座標を示すＹ（UNIT,８bit）からなる。図５Ｃに示すように、ＰＯＩ情報は、ＰＯＩを識別する符号であるPOI IDと、ＰＯＩの種類を示す符号であるPOI Typeと、ＰＯＩの表示位置のＸ座標を示すＸ(UNIT,８bit）と、ＰＯＩの表示位置のＹ座標を示すＹ（UNIT,８bit）とからなる。 As shown in FIG. 5B, the node information includes Node ID (UNIT, 8 bits) which is a code for identifying the node, X (UNIT, 8 bits) indicating the X coordinate of the node, and Y (UNIT indicating the Y coordinate of the node). , 8bit). As shown in FIG. 5C, POI information includes POI ID that is a code for identifying POI, POI Type that is a code that indicates the type of POI, and X (UNIT, 8 bits) that indicates the X coordinate of the POI display position. , Y (UNIT, 8 bits) indicating the Y coordinate of the POI display position.
　次に、図６、図７、図８Ａ～図８Ｇを参照して、誘導交差点及びその周囲の道路形状情報と、その道路形状情報に対応する地図の例を説明する。図６に示すような道路形状の地図は、図７に示すノード情報と、図８Ａ～図８Ｇに示すリンク情報とを用いて表現される。即ち、図６の地図は、ノード［０］～ノード［１８］の１９個のノードと、これらのノードを接続するリンク［０］～リンク［６］の７個のリンクとで定義されている。なお、図６の地図のＸＹ座標の原点（０、０）は左下の端部にあり、地図のサイズは、横方向の座標上の距離（０～２５６）で定義される実距離３２０［ｍ］と、縦方向の座標上の距離（０～１６０）で定義される実距離２００［ｍ］に相当する。図７の表は、図６中のノード［０］～ノード［１８］のノード情報を示し、図８Ａ～図８Ｇは、図６中のリンク［０］～リンク［６］のリンク情報を示している。 Next, with reference to FIGS. 6, 7, and 8A to 8G, an example of a map corresponding to the guidance intersection and its surrounding road shape information and the road shape information will be described. The road shape map as shown in FIG. 6 is expressed using the node information shown in FIG. 7 and the link information shown in FIGS. 8A to 8G. That is, the map of FIG. 6 is defined by 19 nodes from node [0] to node [18] and 7 links from link [0] to link [6] connecting these nodes. . Note that the origin (0, 0) of the XY coordinates of the map of FIG. 6 is at the lower left end, and the size of the map is an actual distance 320 [m defined by the distance (0 to 256) on the horizontal coordinates. ] And the actual distance 200 [m] defined by the distance (0 to 160) on the coordinate in the vertical direction. The table of FIG. 7 shows the node information of the nodes [0] to [18] in FIG. 6, and FIGS. 8A to 8G show the link information of the links [0] to [6] in FIG. ing.
　Ｓ１２において、誘導交差点及びその周囲の道路形状情報が読み出されると、Ｓ１４に進み、地図情報送信部１７は、誘導交差点及びその周囲の道路形状情報を、地図情報受信部２１へ送信する。このとき、誘導交差点毎に、たとえばMap[N]という識別番号を付与して送信する。次いで、Ｓ１６に進み、ナビゲーション部３は、Ｓ１２で読み出された全ての誘導交差点及びその周囲の道路形状情報を送信したか否かを判定する。残りの誘導交差点が有れば（Ｓ１６でＹＥＳ）、Ｓ１２へ戻り、次の誘導交差点及びその周囲の道路形状情報を同様に読み出す。こうして、複数の誘導交差点及びその周囲の道路形状情報は、識別番号（Map[N], Map[N+1], Map[N+2],…）が付され、順次、地図情報送信部１７から地図情報受信部２１へ送信される。 In S12, when the shape information of the guidance intersection and the surrounding road is read, the process proceeds to S14, and the map information transmission unit 17 transmits the shape information of the guidance intersection and the surrounding road to the map information reception unit 21. At this time, for example, an identification number of Map [N] is assigned for each guidance intersection and transmitted. Next, the process proceeds to S16, and the navigation unit 3 determines whether or not all the guidance intersections read in S12 and the road shape information around them have been transmitted. If there are remaining guidance intersections (YES in S16), the process returns to S12, and the next guidance intersection and its surrounding road shape information are similarly read out. Thus, the plurality of guided intersections and the road shape information around them are assigned identification numbers (Map [N], Map [N + 1], Map [N + 2],...), And sequentially map information transmission unit 17. To the map information receiving unit 21.
　このように、本実施形態では、ナビゲーション部３からインストルメントパネル表示部５へ画像データではなく、道路形状情報を送信しているので、通信路１９の帯域幅は狭くてもよい。即ち、通信路１９は、車載ＬＡＮやＣＡＮなどの通常車両に設けられているバス型の通信路を利用可能となり、高価な画像データ通信用の高速通信路を不要とし、車両の製造コストが上昇することがない。 Thus, in this embodiment, since the road shape information is transmitted from the navigation unit 3 to the instrument panel display unit 5 instead of the image data, the bandwidth of the communication path 19 may be narrow. That is, the communication path 19 can use a bus-type communication path provided in a normal vehicle such as an in-vehicle LAN or CAN, eliminates the need for an expensive high-speed communication path for image data communication, and increases the manufacturing cost of the vehicle. There is nothing to do.
　車両用表示装置１は、誘導交差点及びその周囲の道路形状情報として、ノード情報及びリンク情報を、ナビゲーション部３からインストルメントパネル表示部５へ送信している。このため、少ないデータ量の送信により、正確な誘導交差点及びその周囲の地図画像を描画し表示することができる。 The vehicle display device 1 transmits node information and link information from the navigation unit 3 to the instrument panel display unit 5 as the guidance intersection and the road shape information around it. For this reason, an accurate guidance intersection and its surrounding map image can be drawn and displayed by transmitting a small amount of data.
　残りの誘導交差点がなければ（Ｓ１６でＮＯ）、図２のフローチャートは、終了する。 If there is no remaining guidance intersection (NO in S16), the flowchart of FIG. 2 ends.
　次に、図３のフローチャートを参照して、車両用表示装置１が自車を現在の位置から目的地まで経路に沿って誘導する際のナビゲーション部３の動作を説明する。図３のフローチャートは、所定の時間周期で繰り返し実行される。 Next, the operation of the navigation unit 3 when the vehicle display device 1 guides the host vehicle along the route from the current position to the destination will be described with reference to the flowchart of FIG. The flowchart of FIG. 3 is repeatedly executed at a predetermined time period.
　まず、Ｓ３０において、ナビゲーション部３は、誘導交差点の表示を開始する時刻であるか否かを判定する。ナビゲーション部３は、たとえば、自車から誘導交差点までの距離と自車の速度とに基づいて、表示を開始する時刻であるか否かを判定する。具体的には、現在の自車の車速が誘導交差点まで維持されると仮定し、自車が誘導交差点に至るまでの時間が所定のしきい時間以下となる時刻を、表示を開始する時刻と判定すればよい。なお、走行中の道路の種別（一般道、又は高速道）に応じて、しきい時間を変化させてもよい。表示を開始する時刻であると判定した場合（Ｓ３０でＹＥＳ）、Ｓ３２へ進む。表示を開始する時刻でないと判定した場合、図３のフローチャートは終了する。 First, in S30, the navigation unit 3 determines whether it is time to start displaying the guidance intersection. For example, the navigation unit 3 determines whether it is a time to start display based on the distance from the vehicle to the guidance intersection and the speed of the vehicle. Specifically, assuming that the current vehicle speed is maintained up to the guidance intersection, the time until the own vehicle reaches the guidance intersection is equal to or less than a predetermined threshold time, and the display start time What is necessary is just to judge. Note that the threshold time may be changed according to the type of road being traveled (general road or highway). If it is determined that it is time to start display (YES in S30), the process proceeds to S32. If it is determined that it is not time to start display, the flowchart of FIG. 3 ends.
　Ｓ３２では、ナビゲーション部３は、識別番号（例えばMap[N]）と共に、地図画像の表示開始を指示するコマンド（表示開始指示）を、インストルメントパネル表示部５へ送信する。インストルメントパネル表示部５は、識別番号（例えばMap[N]）を用いて、図２に示す動作によって予め送信された誘導交差点及びその周囲の道路形状情報の中から、表示を開始する道路形状情報を特定することができる。 In S32, the navigation unit 3 transmits a command (display start instruction) for instructing display start of the map image to the instrument panel display unit 5 together with the identification number (for example, Map [N]). The instrument panel display unit 5 uses the identification number (for example, Map [N]) to start the display of the road shape from the guidance intersection and its surrounding road shape information transmitted in advance by the operation shown in FIG. Information can be specified.
　Ｓ３４では、ナビゲーション部３は、ＧＰＳ受信機１１から得られた自車の位置の最新情報に基づいて、誘導交差点の周囲における自車の現在位置を示す自車位置情報をインストルメントパネル表示部５へ送信する。自車位置情報には、自車の進行方向を示すDirection（UNIT,８bit）と、Ｘ座標であるＸ（UNIT,８bit）と、Ｙ座標であるＹ（UNIT,８bit）と、誘導交差点までの距離であるDTI（UNIT,８bit）が含まれる。 In S34, the navigation unit 3 displays the vehicle position information indicating the current position of the vehicle around the guidance intersection based on the latest information on the position of the vehicle obtained from the GPS receiver 11 on the instrument panel display unit 5. Send to. The vehicle position information includes Direction (UNIT, 8 bits) indicating the direction of travel of the vehicle, X (UNIT, 8 bits) as the X coordinate, Y (UNIT, 8 bits) as the Y coordinate, and the guidance intersection. DTI (UNIT, 8 bits) that is the distance is included.
　Ｓ３６では、ナビゲーション部３は、自車の位置及び誘導交差点の位置から、自車が誘導交差点を通過したか否かを判断する。誘導交差点を通過した場合、地図情報送信部１７は、地図画像の表示を終了させるためのコマンド（表示終了指示）をインストルメントパネル表示部５へ送信する（Ｓ３６でＹＥＳ）。そして、図３のフローチャートは終了する。一方、誘導交差点を通過していない場合（Ｓ３６でＮＯ）、Ｓ３４へ戻り、自車の位置を更新して、インストルメントパネル表示部５に送信する。 In S36, the navigation unit 3 determines whether or not the vehicle has passed the guidance intersection from the position of the vehicle and the position of the guidance intersection. When passing the guidance intersection, the map information transmission unit 17 transmits a command (display end instruction) for terminating the display of the map image to the instrument panel display unit 5 (YES in S36). Then, the flowchart of FIG. 3 ends. On the other hand, if the vehicle has not passed the guidance intersection (NO in S36), the process returns to S34, and the position of the host vehicle is updated and transmitted to the instrument panel display unit 5.
　次に、図４のフローチャートを参照して、インストルメントパネル表示部５の動作を説明する。まず、Ｓ７０において、地図情報受信部２１は、誘導交差点及びその周囲の道路形状情報を受信することを待機している。地図情報受信部２１が道路形状情報を受信すると（Ｓ７０でＹＥＳ）、地図情報受信部２１は、道路形状情報を地図描画部２３へ転送し、Ｓ７２へ進む。 Next, the operation of the instrument panel display unit 5 will be described with reference to the flowchart of FIG. First, in S <b> 70, the map information receiving unit 21 is on standby to receive the guidance intersection and its surrounding road shape information. When the map information receiving unit 21 receives the road shape information (YES in S70), the map information receiving unit 21 transfers the road shape information to the map drawing unit 23, and proceeds to S72.
　Ｓ７２において、地図描画部２３は、道路形状情報に付された識別番号（例えばMap[N]）毎に、座標変換を行って地図画像を描画する。具体的には、ノード情報及びリンク情報からなる地図座標データを表示器２９の画面座標データに変換して、地図画像を描画する。描画された地図画像のデータは、地図描画部２３内の画像バッファへ記憶される。このように、地図描画部２３は、予め道路形状情報に基づいて誘導交差点及びその周囲の地図画像を描画して記憶しておく。このため、図３のＳ３２においてナビゲーション部３から表示開始指示を受信した場合、速やかに地図画像を表示器２９へ表示することが可能となる。 In S72, the map drawing unit 23 performs coordinate conversion and draws a map image for each identification number (for example, Map [N]) attached to the road shape information. Specifically, map coordinate data composed of node information and link information is converted into screen coordinate data of the display 29, and a map image is drawn. The drawn map image data is stored in an image buffer in the map drawing unit 23. In this way, the map drawing unit 23 draws and stores the guidance intersection and its surrounding map image based on the road shape information in advance. For this reason, when a display start instruction is received from the navigation unit 3 in S32 of FIG. 3, a map image can be quickly displayed on the display device 29.
　図９Ａは、地図情報送信部１７から送信され、地図情報受信部２１で受信される道路形状情報の地図座標系を示す。図９Ｂは、地図描画部２３が描画し、表示器２９へ出力する地図画像の画面描画エリアを示す。 FIG. 9A shows a map coordinate system of road shape information transmitted from the map information transmitting unit 17 and received by the map information receiving unit 21. FIG. 9B shows a screen drawing area of a map image drawn by the map drawing unit 23 and output to the display device 29.
　Ｓ７２において全ての識別番号に係わる地図画像の描画が終了すると、Ｓ７４へ進む。インストルメントパネル表示部５は、ナビゲーション部３からの表示開始指示（図３のＳ３２）を受信することを待機する。ナビゲーション部３から表示開始指示を受信すると（Ｓ７４でＹＥＳ）、Ｓ７６へ進む。 When the drawing of the map images related to all the identification numbers is completed in S72, the process proceeds to S74. The instrument panel display unit 5 waits to receive a display start instruction (S32 in FIG. 3) from the navigation unit 3. When a display start instruction is received from the navigation unit 3 (YES in S74), the process proceeds to S76.
　Ｓ７６において、地図描画部２３は、表示開始指示に含まれる識別番号（例えばMap[N]）に従って、画像バッファに記憶された地図画像を選択し、表示器２９へ出力する。これにより、表示器２９に、誘導交差点及びその周囲の地図画像が表示される。Ｓ７８へ進み、インストルメントパネル表示部５は、ナビゲーション部３から自車位置情報が送信されることを待機する。インストルメントパネル表示部５が自車位置情報を受信すると（Ｓ７８でＹＥＳ）、Ｓ８０へ進む。 In S76, the map drawing unit 23 selects the map image stored in the image buffer according to the identification number (for example, Map [N]) included in the display start instruction, and outputs the map image to the display device 29. Thereby, the guidance intersection and the map image around it are displayed on the display device 29. Proceeding to S78, the instrument panel display unit 5 waits for the vehicle position information to be transmitted from the navigation unit 3. When the instrument panel display unit 5 receives the vehicle position information (YES in S78), the process proceeds to S80.
　Ｓ８０において、地図描画部２３は、Ｓ７６で表示した交差点及びその周囲の地図画像上に、自車位置情報（Direction、Ｘ、Ｙ、DTI）に従って自車の位置を示す自車マークを重ねて描画する。そして、表示器２９は、自車マークが重ねて描画された、交差点及びその周囲の地図画像を表示する。その後、Ｓ８２へ進む。 In S80, the map drawing unit 23 draws the vehicle mark indicating the position of the vehicle according to the vehicle position information (Direction, X, Y, DTI) on the intersection and the surrounding map image displayed in S76. To do. And the indicator 29 displays the intersection and the map image of the circumference | surroundings in which the own vehicle mark was drawn and overlapped. Thereafter, the process proceeds to S82.
　図１０Ａ～図１０Ｄは、地図画像及び自車マークＶＬの表示例を示す図である。自車マークＶＬは、二等辺三角形であり、その頂点の方向が車両進行方向を示す。自車マークＶＬの位置は、自車の進行に連れて、図１０Ａ、図１０Ｂ、図１０Ｃ、図１０Ｄの順番で、同一の地図画像上において変化する。すでに同一の地図画像上で自車マークＶＬを図４に示す処理動作に従って表示している場合、その次の処理動作時には、前回表示した自車マークを削除し、新たに受信した自車位置情報に従って自車マークＶＬの表示位置を更新する。 10A to 10D are diagrams showing display examples of the map image and the vehicle mark VL. The own vehicle mark VL is an isosceles triangle, and the direction of the apex indicates the vehicle traveling direction. The position of the host vehicle mark VL changes on the same map image in the order of FIGS. 10A, 10B, 10C, and 10D as the host vehicle progresses. When the own vehicle mark VL is already displayed on the same map image according to the processing operation shown in FIG. 4, at the next processing operation, the previously displayed own vehicle mark is deleted and the newly received own vehicle position information is displayed. The display position of the vehicle mark VL is updated according to the above.
　このように、地図情報送信部１７は、誘導交差点抽出部１５により抽出された道路形状情報とは別に、ＧＰＳ受信機１１により検出された自車の位置を示す自車位置情報を地図情報受信部２１へ送信する。これにより、誘導交差点及びその周囲の道路形状情報の送信と、自車位置情報の送信とを分離することができる。よって、図１０Ａ～図１０Ｄに示す同一の地図情報を、所定の時間周期毎に繰り返し送信することがなくなるので、通信路１９を伝送する情報量を削減し、且つ、正確な地図画像、及び時々刻々変化する自車の位置を、表示器２９に表示することが可能となる。 As described above, the map information transmission unit 17 obtains the vehicle position information indicating the position of the vehicle detected by the GPS receiver 11 separately from the road shape information extracted by the guidance intersection extraction unit 15. To 21. Thereby, the transmission of the guidance intersection and the surrounding road shape information can be separated from the transmission of the vehicle position information. Accordingly, the same map information shown in FIGS. 10A to 10D is not repeatedly transmitted every predetermined time period, so that the amount of information transmitted through the communication path 19 is reduced, and an accurate map image and sometimes It is possible to display the position of the vehicle that changes every moment on the display 29.
　Ｓ８２において、インストルメントパネル表示部５は、ナビゲーション部３から表示終了指示（図３のＳ３６）を受信することを待機する。インストルメントパネル表示部５は、ナビゲーション部３から表示終了指示を受信すると、Ｓ７６で表示した誘導交差点周囲の地図、及びＳ８０で表示した自車位置を示す自車マークを消去して、Ｓ７０へ戻る。 In S82, the instrument panel display unit 5 waits to receive a display end instruction (S36 in FIG. 3) from the navigation unit 3. When the display end instruction is received from the navigation unit 3, the instrument panel display unit 5 erases the map around the guidance intersection displayed in S76 and the vehicle mark indicating the vehicle position displayed in S80, and returns to S70. .
　実施形態によれば、ナビゲーション部３は誘導交差点及びその周囲の道路形状情報を抽出してインストルメントパネル表示部５へ送信し、インストルメントパネル表示部５は、受信した道路形状情報に基づいて誘導交差点の地図画像を描画して表示している。このため、ナビゲーション部３とインストルメントパネル表示部５との間に地図画像を送信するための高速通信路を設ける必要がなくなる。これにより、高価な高速通信路が不要となり、製造コストの増加を防止することができる。 According to the embodiment, the navigation unit 3 extracts the guidance intersection and its surrounding road shape information and transmits it to the instrument panel display unit 5, and the instrument panel display unit 5 guides based on the received road shape information. The map image of the intersection is drawn and displayed. For this reason, it is not necessary to provide a high-speed communication path for transmitting a map image between the navigation unit 3 and the instrument panel display unit 5. Thereby, an expensive high-speed communication path becomes unnecessary, and an increase in manufacturing cost can be prevented.
　上記のように、本発明の実施形態を記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかとなろう。 As described above, the embodiments of the present invention have been described. However, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.
　たとえば、図１に示した車両用表示装置１のハードウェア構成として、ＣＰＵ、メモリ、及び入出力部を備えるマイクロコントローラを用いることができる。マイクロコントローラは、予めインストールされたコンピュータプログラムを実行することにより、図１に示す複数の情報処理部（１５、１７、２１、２３、２７）を構成する。車両用表示装置１に適用されるコンピュータプログラムは、本発明の他の実施形態の１つである。なお、図１のナビゲーション部３及びインストルメントパネル表示部５とは、異なるマイクロコントローラで構成され、両マイクロコントローラは、通信路１９により接続されている。マイクロコントローラは、図２～図４に示す手順に従って、ＧＰＳ受信機１１、地図情報格納部１３、車両情報検出部２５により取得された情報から、地図画像及び自車マークＶＬを描画及び表示する一連の情報処理を実行する。なお、マイクロコントローラは、車両にかかわる他の制御に用いる他のマイクロコントローラと兼用してもよい。 For example, as a hardware configuration of the vehicular display device 1 shown in FIG. 1, a microcontroller including a CPU, a memory, and an input / output unit can be used. The microcontroller configures a plurality of information processing units (15, 17, 21, 23, 27) shown in FIG. 1 by executing a computer program installed in advance. The computer program applied to the vehicle display device 1 is one of other embodiments of the present invention. The navigation unit 3 and the instrument panel display unit 5 in FIG. 1 are configured by different microcontrollers, and both the microcontrollers are connected by a communication path 19. The microcontroller draws and displays the map image and the vehicle mark VL from the information acquired by the GPS receiver 11, the map information storage unit 13, and the vehicle information detection unit 25 in accordance with the procedure shown in FIGS. The information processing is executed. The microcontroller may also be used as another microcontroller used for other control related to the vehicle.
　特願２０１３－２２９２８２号（出願日：２０１３年１１月５日）の全内容は、ここに援用される。 The entire contents of Japanese Patent Application No. 2013-229282 (filing date: November 5, 2013) are incorporated herein by reference.
　１　車両用表示装置
　３　ナビゲーション部
　５　インストルメントパネル表示部（表示部）
１１　ＧＰＳ受信機
１３　地図情報格納部
１５　誘導交差点抽出部
１７　地図情報送信部
１９　通信路
２１　地図情報受信部
２３　地図描画部
２５　車両情報検出部
２７　車両情報描画部
２９　表示器 DESCRIPTION OF SYMBOLS 1 Display apparatus for vehicles 3 Navigation part 5 Instrument panel display part (display part)
DESCRIPTION OF SYMBOLS 11 GPS receiver 13 Map information storage part 15 Guidance intersection extraction part 17 Map information transmission part 19 Communication path 21 Map information reception part 23 Map drawing part 25 Vehicle information detection part 27 Vehicle information drawing part 29 Indicator

Claims (5)

  1. 　ナビゲーション部と、表示部とを有する車両用表示装置であって、
    　前記ナビゲーション部は、
    　自車の位置を検出する自車位置検出部と、
    　前記自車が走行可能な道路の形状を示す道路形状情報を格納する地図情報格納部と、
    　前記自車位置検出部により検出された前記自車の位置から、予め設定された目的地までの経路上に存在する、誘導すべき交差点及びその周囲の前記道路形状情報を前記地図情報格納部から抽出する誘導交差点抽出部と、
    　前記誘導交差点抽出部により抽出された前記道路形状情報を前記表示部へ送信する地図情報送信部と、を備え、
    　前記表示部は、
    　前記地図情報送信部により送信された前記道路形状情報を受信する地図情報受信部と、
    　前記地図情報受信部により受信された前記道路形状情報に基づいて、前記交差点及びその周囲の地図画像を描画する地図描画部と、
    　前記地図描画部により描画された前記地図画像を表示する表示器と、
    を備えたことを特徴とする車両用表示装置。     A vehicle display device having a navigation unit and a display unit,
    The navigation part
    A vehicle position detector for detecting the position of the vehicle;
    A map information storage unit for storing road shape information indicating the shape of the road on which the vehicle can travel;
    From the map information storage unit, the intersection to be guided and the road shape information around the intersection that exist on the route from the vehicle position detected by the vehicle position detection unit to a preset destination are displayed. A guidance intersection extraction unit to extract;
    A map information transmission unit that transmits the road shape information extracted by the guidance intersection extraction unit to the display unit,
    The display unit
    A map information receiving unit for receiving the road shape information transmitted by the map information transmitting unit;
    Based on the road shape information received by the map information receiving unit, a map drawing unit for drawing the intersection and its surrounding map image;
    A display for displaying the map image drawn by the map drawing unit;
    A vehicle display device comprising:
  2. 　前記誘導交差点抽出部により抽出された前記道路形状情報は、複数の点の座標を示すノード情報と、前記点同士の接続関係を示すリンク情報と、を含むことを特徴とする請求項１に記載の車両用表示装置。 The road shape information extracted by the guidance intersection extraction unit includes node information indicating coordinates of a plurality of points and link information indicating a connection relationship between the points. Vehicle display device.
  3. 　前記地図情報送信部は、前記誘導交差点抽出部により抽出された前記道路形状情報とは別に、前記自車位置検出部により検出された前記自車の位置を示す自車位置情報を前記地図情報受信部へ送信し、
    　前記地図情報受信部が前記自車位置情報を受信した際に、前記地図描画部は、前記交差点及びその周囲の地図画像上に、前記自車位置情報に従って前記自車の位置を示す自車マークを重ねて描画し、
    　前記表示器は、前記自車マークが重ねて描画された、前記交差点及びその周囲の地図画像を表示する
    ことを特徴とする請求項１または２に記載の車両用表示装置。     The map information transmission unit receives vehicle position information indicating the position of the vehicle detected by the vehicle position detection unit, separately from the road shape information extracted by the guidance intersection extraction unit. To the department,
    When the map information receiving unit receives the vehicle position information, the map drawing unit displays a vehicle mark indicating the position of the vehicle according to the vehicle position information on the intersection and its surrounding map images. And draw
    The vehicle display device according to claim 1, wherein the display device displays the intersection and the map image around the intersection where the vehicle mark is drawn in an overlapping manner.
  4. 　自車が走行可能な道路の形状を示す道路形状情報を格納する地図情報格納部を備えるナビゲーション部と、表示部とを有する車両用表示装置を用いた画像表示方法であって、
    　前記ナビゲーション部が、
    　前記自車の位置を検出し、
    　検出された前記自車の位置から、予め設定された目的地までの経路上に存在する、誘導すべき交差点及びその周囲の道路の形状を示す前記道路形状情報を前記地図情報格納部から抽出し、
    　抽出された前記道路形状情報を前記表示部へ送信し、
    　前記表示部が、
    　前記ナビゲーション部から送信された前記道路形状情報を受信し、
    　受信された前記道路形状情報に基づいて、前記交差点及びその周囲の地図画像を描画し、
    　描画された前記地図画像を表示する
    ことを特徴とする画像表示方法。     An image display method using a display device for a vehicle including a navigation unit including a map information storage unit that stores road shape information indicating a shape of a road on which the host vehicle can travel, and a display unit,
    The navigation unit is
    Detecting the position of the vehicle,
    Extracting from the map information storage section the road shape information indicating the shape of the intersection to be guided and the surrounding road existing on the route from the detected position of the vehicle to a preset destination. ,
    Send the extracted road shape information to the display unit,
    The display unit is
    Receiving the road shape information transmitted from the navigation unit;
    Based on the received road shape information, draw the intersection and its surrounding map image,
    An image display method comprising displaying the drawn map image.
  5. 　自車が走行可能な道路の形状を示す道路形状情報を格納する地図情報格納部を備えるナビゲーション部と、表示部とを有する車両用表示装置に適用されるコンピュータプログラムであって、
    　前記ナビゲーション部に、
    　自車の位置を検出する手順と、
    　検出された前記自車の位置から、予め設定された目的地までの経路上に存在する、誘導すべき交差点及びその周囲の道路の形状を示す道路形状情報を地図情報格納部から抽出する手順と、
    　抽出された前記道路形状情報を前記表示部へ送信する手順と、を実行させ、
    　前記表示部に、
    　前記ナビゲーション部から送信された前記道路形状情報を受信する手順と、
    　受信された前記道路形状情報に基づいて、前記交差点及びその周囲の地図画像を描画する手順と、
    　描画された前記地図画像を表示する手順と、を実行させる
    ためのコンピュータプログラム。
          A computer program applied to a vehicle display device having a navigation unit including a map information storage unit that stores road shape information indicating a shape of a road on which the vehicle can travel, and a display unit,
    In the navigation part,
    Procedures for detecting the position of the vehicle,
    A procedure for extracting, from the map information storage unit, road shape information indicating the shape of an intersection to be guided and the surrounding road existing on the route from the detected position of the own vehicle to a preset destination; ,
    Transmitting the extracted road shape information to the display unit, and
    In the display section,
    Receiving the road shape information transmitted from the navigation unit;
    A procedure for drawing a map image of the intersection and its surroundings based on the received road shape information;
    And a procedure for displaying the drawn map image.
PCT/JP2014/077400 2013-11-05 2014-10-15 Display device for vehicle, image display method, and computer program WO2015068542A1 (en)

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