Abstract: An illustrative example embodiment of a system includes object detecting means for providing an indication of an object in a vicinity of a vehicle; at least one indicator means for providing an indication regarding the detected object to a driver; gaze detecting means for providing an indication of the vehicle driver's gaze; brain activity detecting means for providing an indication of the driver's brain activity; and control means for controlling any indication from the indicator means regarding the detected object based upon an indication from the gaze detecting means and the brain activity detecting means corresponding to an estimation of driver awareness of the detected object.

Abstract: A display arrangement comprises an image display device having a first camera directed towards positions adopted by users viewing the display; one or more further cameras directed towards other respective locations; a face detector for detecting human faces in images captured by the cameras; and means for detecting those faces which appear in images captured by both the first camera and at least one of the further cameras.

Abstract: A display arrangement comprises an image display device having two or more sets of images for display; a camera directed towards positions adopted by users viewing the display; a face detector for detecting human faces in images captured by the camera, the face detector being arranged to detect faces in at least two face categories; and means, responsive to the a frequency of detection of categories of faces by the face detector at one or more different periods, for selecting a set of images to be displayed on the image display device at that time of day.