Map processor, navigation device and map displaying method
First Claim
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1. A map processor comprising:
- a storage unit to record map data; and
a control unit;
wherein the control unit reads map data of an area to be displayed from the storage unit and divides the map data into a plurality of regions, determines a redundancy index for each of the plurality of regions, summarizes the plurality of regions with summarization methods determined according to the redundancy indices, recombines the map data of the plurality of summarized regions, and presents the recombined map data on a display means.
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Abstract
In each of the divided regions of the map, a redundancy of the region is estimated from the characteristics quantity such as fractal dimension of line segments of road. Then, regions with the same redundancies are combined to form a larger area so that the map is divided according to the redundancy. The areas thus formed are summarized by the summarization methods conforming to their redundancies and are combined into one map. In the map thus generated, only necessary information can be presented, with redundant information eliminated.
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Citations
14 Claims
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1. A map processor comprising:
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a storage unit to record map data; and
a control unit;
wherein the control unit reads map data of an area to be displayed from the storage unit and divides the map data into a plurality of regions, determines a redundancy index for each of the plurality of regions, summarizes the plurality of regions with summarization methods determined according to the redundancy indices, recombines the map data of the plurality of summarized regions, and presents the recombined map data on a display means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A navigation device comprising:
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a storage unit to store map data;
a position acquisition unit to acquire a present location;
an input unit to receive instructions entered by a user;
a control unit to process the map data; and
a display unit to display the processed map data;
wherein the control unit searches for routes between the present location acquired by the position acquisition unit and a destination acquired through the input unit, reads the map data including the routes from the storage unit and divides the map data into a plurality of regions, determines a redundancy index for each of the plurality of regions, summarizes the plurality of regions with summarization methods determined according to the redundancy indices, recombines the map data of the plurality of summarized regions, and presents the recombined map data on the display unit for route guidance. - View Dependent Claims (11, 12, 13)
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14. A map data displaying method for displaying map data on a display screen, comprising the step of:
summarizing the map data in each of a plurality of regions making up the screen according to a reference different from that used in an original map.
Specification
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Current AssigneeXanavi Informatics Corporation (Hitachi, Ltd.)
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Original AssigneeXanavi Informatics Corporation (Hitachi, Ltd.)
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InventorsAsahara, Akinori, Sumizawa, Akio, Tanizaki, Masaaki, Shimada, Shigeru, Maruyama, Kishiko
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Application NumberUS11/354,051Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current701/208CPC Class CodesG01C 21/3453 Special cost functions, i.e...G01C 21/3676 Overview of the route on th...G06T 17/05 Geographic modelsG09B 29/10 Map spot or coordinate posi...
