JP2006201232A - Navigation system and map display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system and a map display method for comprehensively displaying landmarks or facilities set by a user, and for comprehensively displaying a part of the map that is really necessary for the navigation on a road or the like. <P>SOLUTION: In the map display method, the types of landmarks or facilities set by the user are stored, at least the landmark in the type, or the facility and the roads are color-displayed in the same chroma as the map data, and the part of the map, that is not displayed in the same chroma as the map data, is color-displayed with lower chroma. In this case, a priority display score is stored for each map display object, and the landmarks, facilities, roads, and other display objects are color-displayed in the chroma according to the priority display score. Also, a relational curve between the priority display score and the chroma is changed, according to the speed of vehicle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation device and a map display method, and more particularly, to a navigation device and a map display method for displaying a map portion necessary for navigation in a distinguishable manner with higher saturation than other portions.

The navigation device reads map data corresponding to the current position of the vehicle from a map data storage unit such as a DVD or HDD, draws it on the display screen, and moves the vehicle mark on the map according to traveling, or The mark is fixedly displayed at a fixed position on the display screen (for example, the center position of the display screen), and the map is scrolled. Map data includes (1) a road layer consisting of node data, road link data, intersection data, etc., (2) a background layer for displaying objects on the map, and (3) a name of the city, town, and village. A map image composed of the character layer and the like and displayed on the display screen is generated based on the background layer and the character layer, and map matching processing and guidance route search processing are performed based on the road layer.
In addition to the above, the navigation device has a route guidance function for searching for a guidance route from the departure point to the destination, displaying the guidance route on a map, and a landmark display function for displaying a predetermined landmark on the map. ing. The landmark display is a function for displaying the location of the industry selected by the user as a landmark, such as various convenience stores, gas stations, banks, play facilities, accommodation facilities, and sightseeing spots. In addition, if the supplier is a bank, only the designated bank with an account, not all banks, or if it is a gas station, only the designated gas station that can be settled by card instead of all the gas stations, or only the designated hotel are displayed as landmarks. You can also

By the way, in color display, it is said that it becomes difficult to see if there are a plurality of bright colors due to human visual effects. However, in the conventional map display, the map display considering such a point is not performed, and there is a problem that roads and landmarks are difficult to see on the map. In addition, there is a conventional technique that displays a landmark of the facility by changing the degree of emphasis based on the utilization ratio of the facility (see, for example, Patent Document 1). However, such a conventional technique has a problem that the landmark is difficult to understand even if it is emphasized because the entire map is clear. Further, the conventional technology has a problem that it is difficult for the user to display roads, landmarks, and other really necessary parts.
See JP 2004-317222 A

From the above, an object of the present invention is to display landmarks and facilities set by the user in an easily understandable manner, and to make it possible for the user to easily display the portions that are truly necessary for roads and other navigation.
Another object of the present invention is to display a conspicuous building or facility such as a high-rise building in an easy-to-understand manner or provide voice guidance when approaching the facility.
Another object of the present invention is to reduce the number of parts to be clearly displayed in accordance with the vehicle speed so that a part that is truly necessary for navigation can be easily displayed to the user.

According to the present invention, in the map display method of the navigation device, the above-mentioned problem is stored in the type or facility of the landmark set by the user, and at least the landmark of the type or the facility and the road has a saturation according to the map data. A map portion that is displayed in color and is not displayed with the saturation according to the map data is achieved by a map display method in which the saturation is reduced and displayed in color.
In the map display method, a high-rise building having a height equal to or higher than a set height is displayed in color with a saturation close to that of the map data or close to the map data. In the map display method, voice guidance is provided when approaching the location of the landmark or the facility. In the map display method, a priority display score is stored for each map display object, and color display is performed with a saturation corresponding to the priority display score. In this case, the relationship curve between the priority display score and the saturation changes according to the speed of the vehicle.

According to the present invention, in the navigation device that displays a map around a vehicle, the above-described problem is a map information storage unit that stores map information, a vehicle position measurement unit that measures the vehicle position, and a display that displays a map around the vehicle. A storage unit for storing the type or facility of the landmark set by the user, at least the landmark of the type or the facility and road of the genre are displayed in color on the display unit with the saturation according to the map data. The map portion that is not displayed with the saturation is reduced by the navigation device having the display control unit that displays the color on the display unit with a reduced saturation.
The navigation device includes a storage unit that stores a priority display score for each map display object, and the map display unit performs color display with saturation according to the priority display score. In this case, the display control unit changes the relationship between the priority display score and the saturation according to the vehicle speed, and the map display unit performs color display with the saturation according to the vehicle speed and the priority display score.

According to the present invention, the type or facility of the landmark set by the user is stored, and at least the landmark of the type or the facility and the road are displayed in color with the saturation according to the map data, and with the saturation according to the map data. Map parts that are not displayed are displayed in color with reduced saturation, so landmarks and facilities set by the user are displayed in an easy-to-understand manner, and parts that are truly necessary for navigation such as roads are displayed in an easy-to-understand manner. can do.
According to the present invention, a conspicuous building or facility such as a high-rise building can be displayed in an easily understandable manner, or voice guidance can be provided when approaching the facility.
According to the present invention, it is possible to reduce the number of parts to be clearly displayed according to the vehicle speed, and to display a part that is truly necessary for navigation in an easy-to-understand manner for the user.

  The landmark type or facility set by the user is stored, and at least the landmark of the type or the facility and road are displayed in color with the saturation according to the map data, and the map portion not displayed with the saturation according to the map data is displayed in color. Decrease the display color. In this case, a priority display score is stored for each map display object, the landmarks, facilities, and roads are displayed in color with a saturation corresponding to the priority display score, and the relationship between the priority display score and the saturation is represented by the vehicle. Varies depending on the speed of the.

FIG. 1 is a block diagram of a navigation apparatus according to the present invention. Map data is recorded on a map recording medium (CD-ROM, DVD, HDD, etc.) 1 and can be read as required. Map data consists of (1) road layer used for guidance route search and map matching, (2) background layer for displaying objects on the map, and (3) characters for displaying characters such as city names on the map. Layer, and (4) a landmark layer for displaying landmarks as appropriate.
The background layer is composed of map drawing data as shown in FIGS. 2A and 2B, and the data includes line data and polygon data. Line data is for drawing lines. Line flag / polygon, road line start / end point (curve shape), color, line type, road flag indicating whether or not it is road data Etc. Polygon data is used to draw facilities and the like, and includes line / polygon distinction, polygon shape, color, line type, height (in the case of a building), and the like. The landmark layer holds the landmark data included in the leaf for each leaf.

FIG. 3 is an explanatory diagram of landmark layer data. As shown in FIG.
・ Longitudinal position of the landmark (landmark display position),
・ Landmark icon code,
・ Category (in combination, restaurant, hotel, bank, gas station, etc.),
・ Has a facility name. In the example of (A), as shown in (B), the landmark 50 is displayed at the location (x1, y1) of the Seven-Eleven on the map (figure leaf) MP.
The operation unit 2 is provided with various operation keys for operating the navigation device body 6 and is configured by a remote control or a touch panel. The GPS receiver 3 receives position information transmitted from a GPS satellite and measures the current position of the vehicle. The self-contained navigation sensor 4 includes an angle sensor 4a such as a gyro that detects a vehicle rotation angle, and a travel distance sensor 4b that generates a pulse at every constant travel distance, so that the current position and speed of the vehicle can be measured autonomously. It has become. The navigation device 6 measures the current position of the vehicle by using both GPS and self-contained navigation. The display unit 5 displays a vehicle periphery map, a guidance route, a vehicle position mark, other guidance information and a menu in accordance with an instruction from the navigation device 6.

In the navigation device 6, the map buffer 11 temporarily stores map data read from the map recording medium. As shown in FIG. 4, the map buffer 11 holds at least nine map leaves MP01 to MP09 of the map leaf (MP05) corresponding to the vehicle position and the surrounding map leaves so that the map can be scrolled and displayed as the vehicle travels. It has become. In addition to the map data, the map buffer 11 stores landmark data shown in FIG. 3A for each leaf.
The control unit 15 detects the current position of the vehicle based on various types of information input via the interfaces 12 to 14, reads the vehicle surrounding map data into a buffer, searches for a guidance route, map matching processing, and saturation control of the drawn map. Etc.
As shown in FIG. 5, the location registration memory 16 includes a name (registration location name) of a location (facility) registered by a user operation, an icon code for registration location marking, a category of registration location (facility), and a location of the registration location ( Stores longitude and latitude. In order to register a location (facility) in the location registration memory 16, for example, (1) the location registration key on the remote control is operated to register the location (facility) where the vehicle exists, or (2) it should be registered The point (facility) is instructed with the cursor, and then the point registration menu is selected to register the point (facility).
The display landmark storage unit 17 stores a landmark name (facility name) selected by the user from among a number of landmarks, and the map drawing unit draws only the landmark on the map.

The priority score table 18 stores a priority display score for each map display object (landmark, road, high-rise building, other building, facility, etc.). The priority display score is a value for determining the saturation of the map display object. If the priority display score is 100, the color is displayed in color with the saturation indicated by the graphic drawing command. Color display is performed with low saturation corresponding to the value S. A method for determining saturation will be described later.
The map drawing unit 19 uses the map drawing data read out to the map buffer 11 to generate a map image and a landmark with the saturation indicated by the priority display score, and writes it into the VRAM 20. The image reading unit 21 cuts out a predetermined image portion from the VRAM 20 in accordance with an instruction from the control unit 15 and inputs it to the image composition unit 22. The control unit 15 scrolls the map image by switching the map image written in the VRAM 20 or controlling the image cutout position in the VRAM 20 by the image reading unit 21.

  The guidance route memory 23 records the guidance route information to the destination searched by the control unit 15, that is, the position data of all the nodes constituting the guidance route from the departure point to the destination. The guide route drawing unit 24 generates a guide route image using the guide route information, inputs it to the image composition unit 22, and displays it on the drawing map. The vehicle mark generation unit 25 generates a vehicle position mark and inputs it to the image composition unit 22. The image composition unit 22 superimposes the vehicle mark generated by the vehicle mark generation unit 25 on the map image read from the VRAM 20, the guidance route drawn by the guidance route drawing unit 24, and the like and displays them on the display device 5. The audio output unit 26 generates an audio signal corresponding to the signal input from the control unit 15 and outputs it from a speaker (not shown).

FIG. 6 is an explanatory diagram of the saturation control of the present invention, as shown in (B) for each attribute of the map display object IMi (i = 1, 2,...) Constituting the original image of (A). The priority display score S is stored in the priority score table 18. The priority display score S for landmarks and roads is 100, the priority display score S for high-rise buildings is 90,. . . The priority display score S of other facilities that are not preferentially registered is 100 or less, for example 50. The priority display score S and the transmittance P are in a proportional relationship as shown in (C), and in the case of the proportional coefficient a, the following expression P = a × S (1)
Thus, the transmittance P can be calculated. The transmittance (%) is a ratio of the original image that is transmissively displayed. The map drawing unit 19 generates a map image or a landmark with the saturation indicated by the priority display score using the map drawing data and the priority display score S read out to the map buffer 11 and writes them in the VRAM 20. That is, the map drawing unit 19 obtains the transmittance P according to the priority display score S by the equation (1), and then the following equation h (x, y) = {P / 100} × f (x, y) + {(100−P) / 100} × g (x, y) (2)
Then, the saturation conversion is performed, and an image of the map display object IMi (i = 1, 2,...) Is generated and written in the VRAM 20 with the saturation. However, f (x, y) is an original image, g (x, y) is an image obtained by graying the original image, and h (x, y) is a converted image. In this way, roads and landmarks can be displayed with the same saturation as that of the map drawing data, and other display portions can be displayed with low saturation.

FIG. 7 is a processing flow of the map saturation display control of the invention.
The control unit 15 reads map data around the vehicle position from the map recording medium 1 and stores it in the map buffer 11 (step 101). The map drawing unit 19 extracts map drawing data one by one from the map buffer 11 (step 102), determines whether the map drawing data is road drawing data (step 103). The priority display score S is acquired from the priority score table 18, and the saturation conversion is performed according to the equations (1) and (2) to generate a road image and draw it on the VRAM 20 (steps 104 and 105).
In step 103, if it is not road drawing data, the map drawing unit 19 checks whether it is polygon data (step 106). If it is polygon data, it refers to the height information and is a high-rise building with a predetermined height or higher. A check is made (step 107). If the building is a high-rise building, the priority display score S of the high-rise building is obtained from the priority score table 18, and the saturation conversion is performed according to the equations (1) and (2) to generate a polygon image and draw it in the VRAM 20. (Steps 108 and 105). It should be noted that the height distribution around the polygon of interest can be calculated, and it can be determined that the building is a high-rise building when the height of the polygon of interest is conspicuously high.

If the drawing data is drawing data other than polygons in step 106, or if the building indicated by the polygon is not a high-rise building, the priority display score S thereof is obtained from the priority score table 18, and (1), (2 The saturation conversion is performed according to the equation (2) to generate an image and draw it on the VRAM 20 (steps 109 and 105).
Thereafter, it is checked whether the map image generation processing has been completed for all drawing data (step 110). If not completed, the next drawing data is read in step 102 and the processing in step 103 and subsequent steps is repeated.
On the other hand, if the map image generation processing is completed for all the drawing data in step 110, the selected landmark and registration point mark are generated with the saturation based on the priority display score as in the case of the map image. Drawing on the VRAM 20 (step 111).
Thereafter, the image reading unit 21 cuts out an image portion for one screen around the vehicle position from the VRAM 20 in accordance with an instruction from the control unit 15, inputs it to the image composition unit 22, and displays it on the display device 5.
As described above, according to the first embodiment, roads and landmarks are displayed with the same saturation as that of the map drawing data, and other display portions are displayed with low saturation. It becomes possible to identify. In addition, since conspicuous high-rise buildings and the like are displayed with the saturation of the map drawing data as it is or with a saturation close to it, these can be easily identified. As a result, information necessary for driving can be surely provided to the driver.

FIG. 8 is a flowchart of the voice guidance process when the landmark facility is approached. It is assumed that the number of visits is counted up every time a landmark is visited, and the number of visits is stored in association with the facility name in FIG.
The control unit 15 checks whether a landmark point exists on the display map (step 201), and if it exists, checks whether the number of visits to the facility is greater than the set number by referring to the landmark data ( Step 202), if there are many, it is checked whether it is close to the vehicle position (Step 203). If it is close, the audio output unit 26 is controlled to guide the landmark (for example, “xxx is "Turn right")), etc. (step 204). In this way, landmarks indicating facilities can be easily seen and voice guidance to landmark points is provided, so that facilities required by the driver are not overlooked. Note that guidance control can be similarly performed for registered points (facility).
In the above, the priority display score is not included in the polygon data. However, as shown in FIG. 9A, the priority display score is included in the polygon data, and the polygon display may be performed with the saturation corresponding to the priority display score. it can. In this case, polygons that do not include a priority display score are displayed with a saturation corresponding to a preset priority display score. Also, because there are buildings that are conspicuous at night but not conspicuous during the day due to neon signs or the like, as shown in FIG. 9B, it is possible to include priority display scores for day and night in the polygon data.

In the first embodiment, the relationship curve between the priority display score and the saturation is constant regardless of the vehicle speed, but the relationship curve between the priority display score and the saturation can be changed according to the vehicle speed. FIG. 10 is a block diagram of the navigation device of the second embodiment, and the same parts as those of the first embodiment of FIG. The difference is that a storage unit (priority display score / transmittance correspondence storage unit) 31 that stores a plurality of correspondence curves between the priority display score S and the transmittance P according to the speed is provided.
FIG. 11 is an explanatory diagram of the saturation display control of the second embodiment. For each attribute of the map display object IMi (i = 1, 2,...) Constituting the original image of (A), the priority display score S is stored in the priority score table 18 as shown in (B). Yes. The priority display score S for landmarks and roads is 100, the priority display score S for high-rise buildings is 90,. . . The priority display score S of other facilities that are not preferentially registered is 100 or less, for example 50. The priority display score / transmittance correspondence storage unit 31 stores a plurality of correspondence curves between the priority display score S and the transmittance P according to speed as shown in FIG. That is, when the speed is high, the degree of decrease in transmittance increases as the priority display score S decreases, and when the speed is low, the degree of decrease in transmittance decreases even when the priority display score S decreases. The map drawing unit 19 obtains the priority display score S of the map display object IMi from the priority score table 18, and determines the vehicle speed and the transmittance P according to the priority display score S from the priority display score / transmission correspondence storage unit 31. The map image and the landmark are generated with the saturation indicated by the priority display score using the transmittance, and written into the VRAM 20. That is, the map drawing unit 19 performs saturation conversion by the equation (2) using the transmittance P according to the vehicle speed and the priority display score S, and the map display object IMi (i = 1, 2,. ..) image is generated and written to the VRAM 20. Thereafter, the image reading unit 21 cuts out an image portion for one screen around the vehicle position from the VRAM 20 in accordance with an instruction from the control unit 15, inputs it to the image composition unit 22, and displays it on the display device 5.
As described above, according to the second embodiment, the relationship curve between the priority display score and the saturation is changed according to the speed of the vehicle, and when the vehicle speed is fast, the degree of decrease in the transmittance is increased as the priority display score S is decreased. Only a map display object having a high priority display score S at high speed can be displayed with the same saturation as the original image, and landmarks and roads can be displayed in an easily understandable manner.

It is a block diagram of the navigation apparatus of this invention. It is explanatory drawing of the data for map drawing. It is explanatory drawing of landmark data. It is map data explanatory drawing of a map buffer. It is content explanatory drawing of a point registration memory. It is explanatory drawing of the saturation display control of this invention. It is a processing flow of the map saturation display control of invention. It is a flowchart of the process which carries out audio | voice guidance when approaching the landmark facility. It is explanatory drawing of polygon data. It is a block diagram of the navigation apparatus of 2nd Example. FIG. 10 is an explanatory diagram of saturation display control of saturation display control of the second embodiment.

Explanation of symbols

5 Display device 6 Navigation device 15 Control unit 16 Point registration memory 17 Display POI mark category storage unit 18 Priority score table 19 Map drawing unit 20 VRAM
21 Image reading unit 22 Image composition unit

Claims (8)

In the map display method of the navigation device,
Stores the landmark type or facility set by the user,
At least the type of landmarks or the facilities and roads are displayed in color with saturation according to the map data,
Map parts that are not displayed with the same saturation as the map data are displayed in color with reduced saturation.
A map display method characterized by that. High-rise buildings whose height is higher than the set height will be displayed in color with the same saturation as the map data,
The map display method according to claim 1, wherein: Voice guidance when approaching the landmark location or the facility,
The map display method according to claim 1, wherein: Store the priority display score for each map display object,
Color display with saturation according to the priority display score;
The map display method according to claim 1, wherein: Changing the relationship curve between the priority display score and saturation according to the speed of the vehicle;
The map display method according to claim 4, wherein: In a navigation device that displays a map around a car,
A map information storage unit for storing map information;
The vehicle position measurement unit that measures the vehicle position,
A display that displays a map around the vehicle,
A storage unit for storing a landmark type or facility set by the user;
At least the type of landmarks or the facilities and roads are displayed in color on the display unit with the saturation according to the map data, and the map portion not displayed with the saturation according to the map data is displayed on the display unit with the saturation reduced. A navigation device comprising a display control unit. A storage unit for storing a priority display score for each map display object;
The map display unit displays a color with a saturation corresponding to the priority display score.
The navigation device according to claim 6. The display control unit changes the relationship between the priority display score and saturation according to the speed of the vehicle, and the map display unit performs color display with saturation according to the vehicle speed and the priority display score.
The navigation device according to claim 7.

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