Object location coordinate determination

1. A system, comprising a processor and a memory, the memory storing instructions executable by the processor to:

receive an image from a stationary camera;

based on location coordinates specified for the image, determine location coordinates of an object identified in the image, wherein the location coordinates specified for the image are associated with a visual feature in the received image that includes a calibration sign, wherein the calibration sign is a portable sign and the calibration sign further includes a GPS sensor and a second processor programmed to transmit the location coordinates of the calibration sign based on data received from the GPS sensor of the calibration sign;

receive geometrical properties of the visual feature and location coordinates of the visual feature;

detect the visual feature in the received camera image based on the received geometrical properties;

specify location coordinates for the image by associating the received location coordinates to a projection point of the visual feature in the received image; and

based on the object location coordinates, operate a vehicle.

2. The system of claim 1 , wherein the instructions further include instructions to determine the object location coordinates based on stored location coordinates of each of a plurality of reference points in the image.

3. The system of claim 2 , wherein the instructions further include instructions to:

determine the object location coordinates by identifying one or more projection points in the image associated with the object; and

determine the object location coordinates based on the stored location coordinates.

4. The system of claim 1 , wherein the instructions further include instructions to:

upon determining that a projection point in the image associated with a reference location has moved, adjust predetermined location coordinates of the reference location; and

determine the object location coordinates based on the adjusted location coordinates of the reference location.

5. The system of claim 1 , wherein the instructions further include instructions to determine the location coordinates specified for the image based on a camera location and an orientation of the camera.

6. The system of claim 1 , wherein the instructions further include instructions to determine at least one of a trajectory and a speed of the object based on the received camera image.

7. The system of claim 1 , wherein instructions further include instructions to operate the vehicle by actuating a vehicle brake actuator based on the location coordinates of the detected object and a trajectory of the vehicle.

8. A method, comprising:

receiving an image from a stationary camera;

based on location coordinates specified for the image, determining location coordinates of an object identified in the image, wherein the location coordinates specified for the image are associated with a visual feature in the received image that includes a calibration sign, wherein the calibration sign is a portable sign and the calibration sign further includes a GPS sensor and a second processor programmed to transmit the location coordinates of the calibration sign based on data received from the GPS sensor of the calibration sign;

receive geometrical properties of the visual feature and location coordinates of the visual feature;

detect the visual feature in the received camera image based on the received geometrical properties;

specify location coordinates for the image by associating the received location coordinates to a projection point of the visual feature in the received image; and

based on the object location coordinates, operating a vehicle.

9. The method of claim 8 , further comprising determining the object location coordinates based on stored location coordinates of each of a plurality of reference points in the image.

10. The method of claim 9 , further comprising:

determining the object location coordinates by identifying one or more projection points in the image associated with the object; and

determining the object location coordinates based on the stored location coordinates.

11. The method of claim 8 , further comprising:

upon determining that a projection point in the image associated with a reference location has moved, adjusting the predetermined location coordinates of the reference location; and

determining the object location coordinates based on the adjusted location coordinates of the reference location.

12. The method of claim 8 , further comprising determining the location coordinates specified for the image based on a camera location and an orientation of the camera.

13. The method of claim 8 , further comprising determining at least one of a trajectory and a speed of the object based on the received camera image.

14. The method of claim 8 , further comprising performing the vehicle operation by actuating a vehicle brake actuator based on the location coordinates of the detected object and a trajectory of the vehicle.