Object angle detection

A system, comprising:

• a computer that includes a processor and a memory, the memory including instructions executable by the processor to:
• acquire images, including a first image and a second image of an object attached to a platform that is moving;
• determine a first real world location of a fiducial marker included in the object by determining a first location of the fiducial marker in first pixel coordinates of the first image, and projecting the first pixel coordinates onto a reference plane;
• determine a second real world location of a fiducial marker included in the object by determining a second location of the fiducial marker in second pixel coordinates of the second image, and projecting the second pixel coordinates onto the reference plane;
• determine a center of rotation for the object by fitting the first and second real world locations of the fiducial marker to an arc;
• and
• determine an angle of an axis the object with respect to an axis of the platform based on the center of rotation, a third location of the fiducial marker, and calibration data.