Method and apparatus for drawing a map for a navigation system
First Claim
1. A map drawing method in which a map showing a present vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the method comprising the steps of:
- determining whether a presently-traveled road is displayed on the map;
generating an image of the presently-traveled road if the presently-traveled road is not already displayed on the map; and
displaying the image of the presently-traveled road by superimposing the generated image of the presently-traveled road on the displayed map that did not otherwise display the presently-traveled road.
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Accused Products
Abstract
In a vehicle navigation method and apparatus for drawing a map in which the scale of a displayed map is reduced to display a second wide-area map, an image of a presently-traveled road is drawn on the display so it is superimposed on the wide-area map, even if the wide-area map otherwise does not show the presently-traveled road. When the scale of the presently displayed map is reduced to instead display the wide-area map, a determination is made as to whether the presently-traveled road is displayed. If the presently-traveled road is not displayed, an image of the presently-traveled road is generated from map information pertaining to the presently-traveled road and the image is displayed so it is superimposed on the wide-area map.
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Citations
25 Claims
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1. A map drawing method in which a map showing a present vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the method comprising the steps of:
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determining whether a presently-traveled road is displayed on the map; generating an image of the presently-traveled road if the presently-traveled road is not already displayed on the map; and displaying the image of the presently-traveled road by superimposing the generated image of the presently-traveled road on the displayed map that did not otherwise display the presently-traveled road. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A map drawing method in which a map showing a vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the method comprising the steps of:
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determining whether a presently-traveled road is displayed according to whether the vehicle position is on a presently displayed road or whether the vehicle position is within a predetermined distance of a presently displayed road; generating an image of the presently-traveled road using data pertaining to the presently-traveled road if the presently-traveled road is not already displayed on the map; and displaying the image of the presently-traveled road on the display screen by superimposing the image of the presently-traveled road on the displayed map that did not otherwise display the presently-traveled road. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A navigation apparatus in which a map showing a present vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the apparatus comprising:
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a traveled road image generating section which determines whether a presently-traveled road is displayed according to whether the vehicle position is on a presently displayed road or whether the vehicle position is within a predetermined distance of a presently displayed road, the traveled road image generating section generating an image of the presently-traveled road using data pertaining to the presently-traveled road, if the presently-traveled road is not already displayed on the map; and an image synthesis section coupled to the traveled road image generating section and which displays the image of the presently-traveled road by superimposing the image of the presently-traveled road on the displayed map that did not otherwise display the presently-traveled road. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A map drawing method in which a map showing a present vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the method comprising the steps of:
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determining whether a presently-traveled road is displayed on the map; displaying the image of the presently-traveled road by superimposing the generated image on the displayed map; wherein the step of generating an image includes accessing a map buffer and further includes the steps of; writing data of a second map containing the presently-traveled road into the map buffer; and generating the image of the presently-traveled road from the data written into the map buffer; and wherein of a scale of the displayed map is 1/n while the scale of the second map is 1/m where m<
n, the image of the presently-traveled is displayed at a scale of m/n.
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24. A map drawing method in which a map showing a vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the method comprising the steps of:
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determining whether a presently-traveled road is displayed according to whether the vehicle position is on a presently displayed road or whether the vehicle position is within a predetermined distance of a presently displayed road; generating an image of the presently-traveled road using data pertaining to the presently-traveled road if the presently-traveled road is not displayed; and displaying the image of the presently-traveled road on the display screen by superimposing the image on the displayed map; wherein the step of generating an image includes accessing a map buffer and further includes the steps of; writing data of a second map showing the presently-traveled road into the map buffer; and generating the image of the presently-traveled road from the data written into the map buffer; and wherein if a scale of the map is 1/n while the scale of the second map is 1/m where m<
n, the image of the presently-traveled road is displayed at a scale of m/n.
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25. A navigation apparatus in which a map showing a present vehicle position is displayed while a mark representing the vehicle position is displayed on the map, the apparatus comprising:
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traveled road image generating section which determines whether a presently-traveled road is displayed according to whether the vehicle position is on a presently displayed road, the traveled road image generating section generating an image of the presently-traveled road is not displayed; and an image synthesis section coupled to the traveled road image generating section and which displays the image of the presently-traveled road by superimposing the image on the displayed map; wherein the traveled road image generating section includes a map buffer; and wherein the traveled road image generating section writes data of a second map showing the presently-traveled road into the map buffer and generates the image of the presently-traveled road from the data written into the map buffer; and wherein if the scale of the displayed map is 1/n while wherein the scale of the second map is 1/m where m<
n, the image of the presently-traveled road is displayed at a scale of m/n.
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Specification