Rear side alarm device of vehicle and method thereof

1. A vehicle rear side alarm device, comprising:

a sensor to detect a rear side of a host vehicle;

a display to display a detected object;

a controller communicatively connected to the sensor and the display and configured to:

determine whether the object detected by the sensor is a two-wheeled vehicle;

in response to determination that the detected object is the two-wheeled vehicle, control to alarm the approach of the two-wheeled vehicle through the display; and

in response to the determination that the detected object is the two-wheeled vehicle, expand a preset rear side alarm area to the side of the host vehicle so that the expanded alarm area partially overlaps a tail of the host vehicle, wherein the controller is configured to expand the preset rear side alarm area to an area detectable by the sensor in a forward direction and a reverse direction of the host vehicle.

2. The device of claim 1 , wherein the sensor comprises at least one of a lidar sensor or a radar sensor; and

the controller is configured to determine an intensity or amount of a signal received from the lidar sensor or the radar sensor, and if the determined intensity or amount of the signal is less than a first threshold value, determine the detected object as a two-wheeled vehicle.

3. The device of claim 1 , wherein the controller is configured to determine a width of the detected object, and if the determined width of the object is less than a second threshold value, determine the detected object as a two-wheeled vehicle.

4. The device of claim 1 , wherein the display comprises at least one of a cluster display or a mirror indicator.

5. The device of claim 4 , wherein if the detected object is a two-wheeled vehicle, the display displays a symbol corresponding to the two-wheeled vehicle.

6. The device of claim 1 , wherein the sensor comprises a camera for detecting rear side of the host vehicle, and

the controller is configured to detect an object from an image obtained by the camera and determine whether the detected object is a two-wheeled vehicle.

7. The device of claim 6 , wherein if the detected object is a two-wheeled vehicle, the controller controls to display the image obtained by the camera on the display.

8. A vehicle rear side alarm method, comprising:

detecting, by a sensor, rear side of a host vehicle;

determining whether an object detected by the sensor is a two-wheeled vehicle;

in response to determination that the detected object is the two-wheeled vehicle, alarming the approach of the two-wheeled vehicle through a display; and

in response to the determination that the detected object is the two-wheeled vehicle, expanding a preset rear side alarm area to the side of the host vehicle so that the expanded alarm area partially overlaps a tail of the host vehicle, wherein the expanding comprises expanding the preset rear side alarm area to an area detectable by the sensor in a forward direction and a reverse direction of the host vehicle.

9. The method of claim 8 , wherein the detecting is performed by one of a lidar sensor or a radar sensor; and

the determining comprises determining an intensity or amount of a signal received from the lidar sensor or the radar sensor; and if the determined intensity or amount of the object is less than a first threshold value, determining the detected object as a two-wheeled vehicle.

10. The method of claim 8 , wherein the determining comprises determining a width of the detected object, and if the determined width of the object is less than a second threshold value, determining the detected object as a two-wheeled vehicle.

11. The method of claim 8 , wherein the alarming comprises displaying on at least one of a cluster display or a mirror indicator.

12. The method of claim 11 , wherein if the detected object is a two-wheeled vehicle, the alarming comprises displaying a symbol corresponding to the two-wheeled vehicle.

13. The method of claim 8 , wherein the detecting comprises detecting rear side of the host vehicle by a camera; and

the determining comprises detecting an object from the image, and determining whether the detected object is a two-wheeled vehicle.

14. The method of claim 13 , wherein the alarming comprises displaying the image obtained by the camera on the display.