Autonomous driving system and autonomous driving method

1. An autonomous driving system, comprising:

a first sensor installed in a vehicle, having a field of view facing in front of the vehicle, and configured to acquire front image data;

a second sensor selected from the group consisting of a radar and a light detection and ranging (lidar), installed in the vehicle, having a detection field of view facing in front of the vehicle, and configured to acquire forward detection data;

a communicator configured to receive a high definition map at a current location of the vehicle from an external server; and

a controller including a processor configured to process the high definition map, the front image data, and the forward detection data; wherein

the controller is configured to:

calculate a first distance between the vehicle and a right road boundary line and a second distance between the vehicle and a left road boundary line in response to processing the front image data and the forward detection data,

calculate a third distance between the vehicle and the right road boundary line and a fourth distance between the vehicle and the left road boundary line in response to processing the high definition map,

determine a map quality index of the high definition map based on at least one of a difference between the first distance and the third distance or a difference between the second distance and the fourth distance,

correct coordinates of the vehicle on the high definition map based on the at least one of a difference between the first distance and the third distance or a difference between the second distance and the fourth distance to correct the determined map quality index,

determine whether an error of the high definition map is present based on the corrected map quality index, and

transfer a control right of the vehicle to a driver in response to a determination that the error of the high definition map is present.

2. The autonomous driving system of claim 1 , wherein

the controller is configured to determine that the error of the high definition map is present when the map quality index is less than or equal to a predetermined threshold value.

3. The autonomous driving system of claim 1 , wherein the controller is configured to determine the map quality index by reducing the map quality index in response to determination that the calculated difference between the first distance and the third distance is greater than or equal to a predetermined first value.

4. The autonomous driving system of claim 3 , wherein

the controller is configured to determine the map quality index by improving the map quality index in response to determination that the calculated difference between the first distance and the third distance is less than or equal to a predetermined second value that is smaller than the predetermined first value.

5. The autonomous driving system of claim 1 , wherein

the controller is configured to determine the map quality index by reducing the map quality index in response to determination that the calculated difference between the second distance and the fourth distance is greater than or equal to the predetermined first value.

6. The autonomous driving system of claim 5 , wherein

the controller is configured to determine the map quality index by improving the map quality index in response to determination that the calculated difference between the second distance and the fourth distance is less than or equal to a predetermined second value that is smaller than the predetermined first value.

7. The autonomous driving system of claim 1 , wherein

the controller is configured to reduce the map quality index when a color or a shape of a lane detected in response to processing the front image data and the forward detection data and a color or a shape of a lane acquired in response to processing the high definition map are different.

8. The autonomous driving system of claim 1 , wherein

the controller is configured to determine coordinates of the vehicle on the high definition map such that a sum of a RMSE between the first distance and the third distance and a RMSE between the second distance and the fourth distance is minimized.

9. The autonomous driving system of claim 1 , wherein

the controller is configured to control the communicator to transmit at least one of the front image data and the forward detection data to the server in response to the determination that the error of the high definition map is present.

10. An autonomous driving method, comprising steps of:

acquiring front image data from a front camera installed in a vehicle and having a field of view facing in front of the vehicle;

receiving, by a communicator, a high definition map at a current location of the vehicle from an external server;

calculating, by a controller, a first distance between the vehicle and a right road boundary line and a second distance between the vehicle and a left road boundary line in response to processing the front image data,

calculating, by the controller, a third distance between the vehicle and the right road boundary line and a fourth distance between the vehicle and the left road boundary line in response to processing the high definition map;

determining, by the controller, a map quality index of the high definition map based on at least one of a difference between the first distance and the third distance or a difference between the second distance and the fourth distance;

determining, by the controller, a map quality index of the high definition map based on at least one of a difference between the first distance and the third distance or a difference between the second distance and the fourth distance by correcting coordinates of the vehicle on the high definition map based on the at least one of a difference between the first distance and the third distance or a difference between the second distance and the fourth distance to correct the determined map quality index;

determining whether an error of the high definition map is present based on the corrected map quality index; and

transferring a control right of the vehicle to a driver in response to a determination that the error of the high definition map is present.

11. The method of claim 10 , wherein the step of determining the error includes determining that the error of the high definition map is present when the map quality index is less than or equal to a predetermined threshold value.

12. Method of claim 10 , wherein the step of determining the map quality index includes reducing the map quality index in response to determination that the calculated difference between the first distance and the third distance is greater than or equal to a predetermined first value.

13. The method of claim 12 , wherein the step of determining the map quality index includes improving the map quality index in response to determination that the calculated difference between the first distance and the third distance is less than or equal to a predetermined second value that is smaller than the predetermined first value.

14. The method of claim 10 , wherein the step of determining the map quality index includes reducing the map quality index in response to determination that the calculated difference between the second distance and the fourth distance is greater than or equal to the predetermined first value.

15. The method of claim 14 , wherein the step of determining the map quality index includes improving the map quality in response to determination that the calculated difference between the second distance and the fourth distance is less than or equal to a predetermined second value that is smaller than the predetermined first value.

16. The method of claim 10 , further comprising a step of reducing the map quality index when a color or a shape of a lane detected in response to processing the front image data and a color or a shape of a lane acquired in response to processing the high definition map are different.

17. The method of claim 10 , further comprising a step of determining coordinates of the vehicle on the high definition map such that a sum of a RMSE between the first distance and the third distance and a RMSE between the second distance and the fourth distance is minimized.

18. The method of claim 10 , further comprising a step of controlling the communicator to transmit the front image data to the server in response to the determination that the error of the high definition map is present.