1. A method to perform inventory display auditing, the method comprising: overlaying a reference image over a current image displayed on a camera display, the reference image corresponding to an inventory display to be audited; comparing the reference image and the current image to determine whether the current image and the reference image correspond to a same scene; and when the reference image and the current image are determined to correspond to the same scene, modifying a characteristic of the current image in a difference region identified in the current image to display the difference region in an overlay of the reference image and the current image displayed on the camera display, the difference region being a first region of the current image that differs from a corresponding first region of the reference image.