US Patent 11417020 Detection of calibration errors

A method includes: obtaining a stereo pair of images from a stereo camera assembly of a mobile computing device, the stereo pair of images depicting a first marker and a second marker each associated with the mobile computing device; determining, from the stereo pair of images, a distance between the first and second markers; comparing a threshold to a difference between the determined distance and a reference distance corresponding to the first and second reference markers; and when the difference exceeds the threshold, generating an alert notification.