Abstract: A method of operating a data processing apparatus is provided. The method includes receiving video data; receiving a virtual test signal representative of a location of a virtual object; setting data representing the horizontal and vertical size of the virtual object dependent upon the location of the virtual object; overlaying the received video data with an image of the virtual object at locations determined from the virtual test signal to generate virtual test video data; and analyzing the virtual test video data and generating an alarm signal based on an output signal generated by said analysis.

Abstract: An apparatus is disclosed which is operative to analyze a sequence of video frames of a camera view field to track an object in the view field and determine start and end points of the track in the view field. The apparatus also determines a start and end time for the track corresponding to the start and end points respectively; and stores the start and end points and the start and end times as attributes of the track.

Abstract: An apparatus is disclosed which is operative to analyze a sequence of video frames of a camera view field to track an object in the view field and determine a temporal relationship start and end points of track in view field. The apparatus also determines a sequence of video frames of a plurality of surveillance network camera view fields to track an object in respective view fields and store respective start and end points and start and end times as attributes of each said track for respective view fields.

Abstract: Data processing apparatus comprising a video data receiver configured to receive video data, and an audio data receiver configured to receive audio data. The apparatus further comprises an alarm engine configured to analyse said received video and audio data and generate an alarm signal based on an output signal generated by said analysis.