Display system, display method, and display program

1. A display system for generating and displaying an arrow object superimposed on an actual image of a road ahead of a vehicle, the display system comprising:

a controller that:

accesses information about a lane change route for guiding the vehicle when changing from a travel lane to a recommended lane, the travel lane being a lane in which the vehicle is currently traveling, the recommended lane being a lane that allows the vehicle to enter a lane in which the vehicle is to travel after passing through a road junction ahead of the vehicle;

generates and displays a travel lane part of the arrow object, the travel lane part being displayed as a superimposed image on the travel lane;

generates and displays a crossing part of the arrow object the crossing lane part being displayed as a superimposed image traversing from the travel lane to the recommended lane;

generates and displays a recommended lane party of the arrow object, the recommended arrow lane part being displayed as a superimposed image on the recommended lane; and

changes a shape of the displayed arrow object such that, as a remaining distance from a current position of the vehicle to the junction becomes smaller, a total distance of a directional component along the travel lane for the travel lane part and a directional component along the travel lane for the crossing part is shortened while a total distance of the directional component along the travel lane for the travel lane part, the directional component along the travel lane for the crossing part, and a directional component along the travel lane for the recommended lane part does not change.

2. The display system according to claim 1 , wherein the controller: changes the shape of the arrow object such that, as the remaining distance becomes smaller, at least one of a start point, a first change point, and a second change point moves closer toward the current position of the vehicle along a central vector of the travel lane or the recommended lane in which each of the points is present, the start point being a farthest point from the current position of the vehicle in the recommended lane part, the first change point being an intersection between the crossing part and the recommended lane part, and the second change point being an intersection between the travel lane part and the crossing part.

3. The display system according to claim 1 , wherein the controller:

determines a present position of the vehicle; and

determines the lane change route based on the present position of the vehicle and the lane in which the vehicle is to travel after passing through the road junction.

4. A display method for generating and displaying an arrow object superimposed on an actual image of a road ahead of a vehicle, comprising:

accessing, by a controller, information about a lane change route for guiding the vehicle when changing from a travel lane to a recommended lane, the travel lane being a lane in which the vehicle is currently traveling, the recommended lane being a lane that allows the vehicle to enter a lane in which the vehicle is to travel after passing through a road junction ahead of the vehicle;

generating and displaying, by the controller, a travel lane part of the arrow object, the travel lane part being displayed as a superimposed image on the travel lane;

generating and displaying, by the controller, a crossing part of the arrow object the crossing lane part being displayed as a superimposed image traversing from the travel lane to the recommended lane;

generating and displaying, by the controller, a recommended lane part of the arrow object, the recommended arrow lane part being displayed as a superimposed image on the recommended lane; and

changing, by the controller, a shape of the displayed arrow object such that, as a remaining distance from a current position of the vehicle to the junction becomes smaller, a total distance of a directional component along the travel lane for the travel lane part and a directional component along the travel lane for the crossing part is shortened while a total distance of the directional component along the travel lane for the travel lane part, the directional component along the travel lane for the crossing part, and a directional component along the travel lane for the recommended lane part does not change.

5. The display method according to claim 4 , further comprising:

changing, by the controller, the shape of the arrow object such that, as the remaining distance becomes smaller, at least one of a start point, a first change point, and a second change point moves closer toward the current position of the vehicle along a central vector of the travel lane or the recommended lane in which each of the points is present, the start point being a farthest point from the current position of the vehicle in the recommended lane part, the first change point being an intersection between the crossing part and the recommended lane part, and the second change point being an intersection between the travel lane part and the crossing part.

6. The display method according to claim 4 , further comprising:

determining, by the controller, a present position of the vehicle; and

determining, by the controller, the lane change route based on the present position of the vehicle and the lane in which the vehicle is to travel after passing through the road junction.

7. A non-transitory computer-readable storage medium storing a computer-executable display program usable to generate and display an arrow object superimposed on an actual image of a road ahead of a vehicle, the program comprising:

instructions for accessing information about a lane change route for guiding the vehicle when changing from a travel lane to a recommended lane, the travel lane being a lane in which the vehicle is currently traveling, the recommended lane being a lane that allows the vehicle to enter a lane in which the vehicle is to travel after passing through a road junction ahead of the vehicle;

instructions for generating and displaying a travel lane part of the arrow object, the travel lane part being displayed as a superimposed image on the travel lane;

instructions for generating and displaying a crossing part of the arrow object the crossing lane part being displayed as a superimposed image traversing from the travel lane to the recommended lane;

instructions for generating and displaying a recommended lane part of the arrow object, the recommended arrow lane part being displayed as a superimposed image on the recommended lane; and

instructions for changing a shape of the displayed arrow object such that, as a remaining distance from a current position of the vehicle to the junction becomes smaller, a total distance of a directional component along the travel lane for the travel lane part and a directional component along the travel lane for the crossing part is shortened while a total distance of the directional component along the travel lane for the travel lane part, the directional component along the travel lane for the crossing part, and a directional component along the travel lane for the recommended lane part does not change.

8. The storage medium according to claim 7 , the program further comprising: instructions for changing the shape of the arrow object such that, as the remaining distance becomes smaller, at least one of a start point, a first change point, and a second change point moves closer toward the current position of the vehicle along a central vector of the travel lane or the recommended lane in which each of the points is present, the start point being a farthest point from the current position of the vehicle in the recommended lane part, the first change point being an intersection between the crossing part and the recommended lane part, and the second change point being an intersection between the travel lane part and the crossing part.

9. The storage medium according to claim 7 , the program further comprising: instructions for determining a present position of the vehicle; and instructions for determining the lane change route based on the present position of the vehicle and the lane in which the vehicle is to travel after passing through the road junction.

10. A display system for generating and displaying an arrow object superimposed on an actual image of a road ahead of a vehicle, the display system comprising:

a controller that:

accesses information about a lane change route for guiding the vehicle when changing from a travel lane to a recommended lane, the travel lane being a lane in which the vehicle is currently traveling, the recommended lane being a lane that allows the vehicle to enter a lane in which the vehicle is to travel after passing through a road junction ahead of the vehicle;

generates and displays a travel lane part of the arrow object, the travel lane part being displayed as a superimposed image on the travel lane;

generates and displays a crossing part of the arrow object the crossing lane part being displayed as a superimposed image traversing from the travel lane to the recommended lane;

generates and displays a recommended lane part of the arrow object, the recommended arrow lane part being displayed as a superimposed image on the recommended lane; and

changes a shape of the displayed arrow object such that, as a remaining distance from a current position of the vehicle to the junction becomes smaller, a distance of a directional component along the travel lane for the recommended part is lengthened and a total distance of a directional component along the travel lane for the travel lane part, a directional component along the travel lane for the crossing part, and the directional component along the travel lane for the recommended lane part does not change.