Camera optical quality maintenance systems and methods

A camera system of a vehicle includes: a camera within a passenger cabin of the vehicle and configured to capture an image including an occupant of a seat within the passenger cabin; a straight edge detection module configured to detect a straight edge in the image; a score module configured to determine a score for the straight edge, the score corresponding to an optical quality of the camera; and an action module configured to take one or more actions when the score is less than a predetermined value.