ROUTE GUIDANCE APPARATUS, ROUTE GUIDANCE METHOD, ROUTE GUIDANCE PROGRAM AND COMPUTER-READABLE RECORDING MEDIUM
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Abstract
A route guidance apparatus includes a detecting unit that detects from an set route a left/right-turn point that a vehicle has not passed; a searching unit that searches for an alternative route before the vehicle passes the left/right-turn point in case the vehicle misses the turn at the left/right-turn point; a computing unit that computes cost information concerning the alternative route and cost information concerning a direct route on the set route from the left/right-turn point to a merging point where the set route meets the alternative route; a determining unit that determines a degree of importance of the left/right-turn point based on the cost information; and an output unit that outputs, before the mobile object passes the left/right-turn point, alarm information that concerns the left/right-turn point and is based on the degree of importance determined.
15 Citations
23 Claims
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1-12. -12. (canceled)
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13. A route guidance apparatus comprising:
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a detecting unit that detects from a set route, a left/right-turn point that a vehicle has not passed; a searching unit that searches for an alternative route before the vehicle passes the left/right-turn point in case the vehicle does not turn at the left/right-turn point; a computing unit that computes cost information concerning the alternative route and cost information concerning a direct route on the set route from the left/right-turn point to a merging point where the set route and the alternative route meet; a determining unit that determines a degree of importance of the left/right-turn point based on the cost information computed by the computing unit; and an output unit that based on the degree of importance determined by the determining unit, outputs alarm information before the mobile object passes the left/right-turn point, the alarm information concerning the left/right-turn point. - View Dependent Claims (14, 15, 16)
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17. A route guidance method comprising:
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a detecting step of detecting from a set route, a left/right-turn point that a vehicle has not passed; a searching step of searching for an alternative route before the vehicle passes the left/right-turn point in case the vehicle does not turn at the left/right-turn point; a computing step of computing cost information concerning the alternative route and cost information concerning a direct route on the set route from the left/right-turn point to a merging point where the set route and the alternative route meet; a determining step of determining a degree of importance of the left/right-turn point based on the cost information computed at the computing step; and an output step of outputting based on the degree of importance determined by the determining unit, alarm information before the mobile object passes the left/right-turn point, the alarm information concerning the left/right-turn point. - View Dependent Claims (18, 19, 20)
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21. A computer-readable recording medium storing therein a route-guidance computer program that causes a computer to execute:
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a detecting step of detecting from a set route, a left/right-turn point that a vehicle has not passed; a searching step of searching for an alternative route before the vehicle passes the left/right-turn point in case the vehicle does not turn at the left/right-turn point; a computing step of computing cost information concerning the alternative route and cost information concerning a direct route on the set route from the left/right-turn point to a merging point where the set route and the alternative route meet; a determining step of determining a degree of importance of the left/right-turn point based on the cost information computed at the computing step; and an output step of outputting based on the degree of importance determined by the determining unit, alarm information before the mobile object passes the left/right-turn point, the alarm information concerning the left/right-turn point.
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22. A route guidance apparatus comprising:
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a detecting unit that detects from a set route, a given point that a vehicle has not passed; a searching unit that searches for an alternative route before the vehicle passes the given point in case the vehicle does not pass the given point according to the set route; a computing unit that computes cost information concerning the alternative route; and an output unit that outputs, based on the cost information computed by the computing unit, alarm information concerning the given point before the mobile object passes the given point.
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23. A route guidance method comprising:
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a detecting step of detecting from a set route, a given point that a vehicle has not passed; a searching step of searching for an alternative route before the vehicle passes the given point in case the vehicle does not pass the given point according to the set route; a computing step of computing cost information concerning the alternative route; and an output step of outputting, based on the cost information computed by the computing unit, alarm information concerning the given point before the mobile object passes the given point.
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Specification