Vehicle lighting system

1. A vehicle lighting system comprising:

a lighting device configured to emit a first light and a second light to a periphery of a vehicle, the second light having a higher directivity than the first light;

a camera configured to acquire image information by capturing a periphery of the vehicle;

a detector configured to emit an electromagnetic wave to the periphery of the vehicle and acquire a reflection wave of the electromagnetic wave; and

an electronic control unit configured to:

detect a physical body in the periphery of the vehicle using the image information,

detect the physical body using information of the reflection wave,

control the lighting device such that the lighting device emits the first light to the physical body and illuminates an entirety of the physical body, in response to the physical body being detected based on the reflection wave,

determine whether the physical body detected using the image information is a target object to which a caution indication needs to be provided, in a state where the first light is emitted towards the physical body, and

control the lighting device such that the lighting device emits the second light toward a predetermined range around the target object, in response to the physical body being determined to be the target object to which the caution indication needs to be provided.

2. The vehicle lighting system according to claim 1 , wherein

the electronic control unit is configured to

determine whether a detection result of the camera acquired without an emission of the first light is insufficient to determine whether the physical body is the target object, and

control the lighting device such that the lighting device emits the first light to the physical body, when determining that the detection result of the camera is insufficient.

3. The vehicle lighting system according to claim 2 , wherein

the electronic control unit is configured to

determine whether a detection result of the camera about the physical body in the state where the first light is being emitted is insufficient to determine whether the physical body is the target object, and

determine whether the physical body is the target object, when the detection result of the camera in the state where the first light is being emitted is not insufficient.

4. The vehicle lighting system according to claim 2 , wherein

the electronic control unit is configured to

control the lighting device such that the lighting device does not emit the first light to the physical body, when the detection result of the camera is determined to be not insufficient, and

determine whether the physical body detected by the camera in a state where the first light is not being emitted is the object, when the detection result of the camera is determined to be not insufficient.

5. The vehicle lighting system according to claim 3 , wherein

the electronic control unit is configured to control the lighting device such that the lighting device continues to emit the first light to the physical body, when the detection result of the camera in the state where the first light is being emitted is determined to be insufficient.

6. The vehicle lighting system according to claim 2 , wherein

the electronic control unit is configured to determine that the detection result of the camera is insufficient, when existence of the physical body is detected by the detector and is not been detected by the camera.

7. The vehicle lighting system according to claim 2 , wherein

the electronic control unit is configured to determine that the detection result of the camera is insufficient, when an attribute of the physical body is unable to be discriminated from the detection result of the camera.

8. The vehicle lighting system according to claim 2 , wherein

the electronic control unit is configured to determine that the detection result of the camera is insufficient, when detection reliability for the physical body is lower than a predetermined threshold.

9. The vehicle lighting system according to claim 1 , wherein

an emission range of the first light is wider than an emission range of the second light.

10. The vehicle lighting system according to claim 1 , wherein

an illuminance of the first light is lower than an illuminance of the second light.

11. The vehicle lighting system according to claim 1 , wherein

the first light and the second light are different in color tone from each other.

12. The vehicle lighting system according to claim 1 , wherein

the electronic control unit is configured to control the lighting device such that the lighting device repeats emission and stopping of the second light at a predetermined interval.

13. The vehicle lighting system according to claim 1 , wherein

the second light is emitted as a light that draws a predetermined pattern.

14. The vehicle lighting system according to claim 1 , wherein

the electronic control unit is configured to:

determine whether the physical body is a human, and

control the lighting device such that the lighting device emits the second light to a lower side relative to a face position of the human, when determining that the physical body is the human.

15. The vehicle lighting system according to claim 1 , wherein

the electronic control unit is configured to determine whether the physical body is the target object, based on the image information obtained in the state where the first light is being emitted and the information of the reflection wave.

16. The vehicle lighting system according to claim 13 , wherein

the second light draws an image containing a figure of an arrow, on a road surface in front of the target object, the arrow pointing from the target object towards the vehicle.