Highly-accurate and self-adjusting imaging sensor auto-calibration for in-vehicle driver monitoring system or other system

An apparatus comprising:

• at least one processing device configured to:
• obtain multiple images of a driver of a vehicle using an imaging sensor associated with the vehicle, the images of the driver capturing the driver's head and obtained in response to the vehicle moving at or above a threshold speed;
• identify, in each of at least some of the images, an orientation of the driver's head in the image;
• identify an average orientation of the driver's head based on at least some of the identified orientations of the driver's head;
• identify a current orientation of the driver's head based on at least one additional image of the driver captured using the imaging sensor;
• and
• determine whether the driver is inattentive based on a difference between the current orientation of the driver's head and the average orientation of the driver's head.

A non-transitory machine-readable medium containing instructions that when executed cause at least one processor to:

• obtain multiple images of a driver of a vehicle using an imaging sensor associated with the vehicle, the images of the driver capturing the driver's head and obtained in response to the vehicle moving at or above a threshold speed;
• identify, in each of at least some of the images, an orientation of the driver's head in the image;
• identify an average orientation of the driver's head based on at least some of the identified orientations of the driver's head;
• identify a current orientation of the driver's head based on at least one additional image of the driver captured using the imaging sensor;
• and
• determine whether the driver is inattentive based on a difference between the current orientation of the driver's head and the average orientation of the driver's head.