Display method of navigation map
First Claim
Patent Images
1. A display method of navigation map using a navigation system, said navigation system comprising:
- position information output means for outputting position information of an objective display point;
memory means for storing map information in a predetermined memory region, in which said memory means divides said predetermined memory region into plural divided memory regions, and divided map information obtained by dividing said map information is stored individually in said plural divided memory regions;
display means for displaying part of said map information stored in said memory means in a display object region on a display screen; and
control means or controlling said memory means and said display means on the basis of said position information, in which said control means recognizes the continuity of map regardless of a physical position relation of said plural divided memory regions, and scrolls and displays part of said map information on said display screen so as to include said objective display point,said display method of navigation map comprising the steps of;
(a) dividing said predetermined memory region into plural judging regions, in which said plural judging regions are set so that the moving direction of said objective display point may be recognized at a point sufficient for displaying on said display screen without updating the content of said predetermined memory region said, plural judging regions being provided independently with said plural divided memory regions;
(b) recognizing the moving direction of said objective display point, on the basis of said position information, by determining a judging region corresponding to said objective display region out of said plural judging regions and detecting changes of said judging region corresponding to said objective display point; and
(c) recognizing the display object region on said display screen and a display object off region out of said display screen in said predetermined memory region, when the moving direction of said objective display point is recognized at said step (b), and updating the map information by writing map information specifying the map continuous along the moving direction of said objective display point to the map specified by the map information in said display object region in said display object off region on a priority basis based on the recognized moving direction of said objective display point.
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Abstract
To obtain a display method navigation map intended to lessen the load of control means such as CPU, by quick scroll display. By comparison between preceding judging region (JO) and present judging region (JN), a changing direction of judging region is recognized, and rewriting is processed in advance in a page (display off divided memory region) of a map memory, being out of map display region of a display device. At this time, rewriting is processed by priority in a divided memory region that is high in possibility of move of the own vehicle and that must be written at the earliest opportunity.
16 Citations
15 Claims
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1. A display method of navigation map using a navigation system, said navigation system comprising:
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position information output means for outputting position information of an objective display point; memory means for storing map information in a predetermined memory region, in which said memory means divides said predetermined memory region into plural divided memory regions, and divided map information obtained by dividing said map information is stored individually in said plural divided memory regions; display means for displaying part of said map information stored in said memory means in a display object region on a display screen; and control means or controlling said memory means and said display means on the basis of said position information, in which said control means recognizes the continuity of map regardless of a physical position relation of said plural divided memory regions, and scrolls and displays part of said map information on said display screen so as to include said objective display point, said display method of navigation map comprising the steps of; (a) dividing said predetermined memory region into plural judging regions, in which said plural judging regions are set so that the moving direction of said objective display point may be recognized at a point sufficient for displaying on said display screen without updating the content of said predetermined memory region said, plural judging regions being provided independently with said plural divided memory regions; (b) recognizing the moving direction of said objective display point, on the basis of said position information, by determining a judging region corresponding to said objective display region out of said plural judging regions and detecting changes of said judging region corresponding to said objective display point; and (c) recognizing the display object region on said display screen and a display object off region out of said display screen in said predetermined memory region, when the moving direction of said objective display point is recognized at said step (b), and updating the map information by writing map information specifying the map continuous along the moving direction of said objective display point to the map specified by the map information in said display object region in said display object off region on a priority basis based on the recognized moving direction of said objective display point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification