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Videotelephone

Abstract

It is known that there are, on the one hand, videotelephones and, on the other hand, surveillance systems in which a room is monitored by a video camera and the pictures generated by this video camera are displayed on a surveillance screen. Such a surveillance system is quite expensive. The problem of the invention lies in creating a suitable room surveillance system with little expenditure. This object is achieved by providing the videotelephone (1) with a surveillance circuit (3). The surveillance circuit (3) exhibits a frame buffer (10) in which the frames supplied by the video camera (4) are stored. The frame in each case supplied by the video camera (4) is compared with a stored frame recorded shortly before in a comparison circuit (11) and an alarm signal is output when the two frames differ by a predetermined measure. The surveillance circuit (3) extends the field of application of the videotelephone. <IMAGE>

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Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (2)

    Title
    SEL-Prospekt "Telefonieren von Angesicht zu Angesicht"
    W. KAISER: Interaktive Breitbandkommunika- tion, Springer Verlag 1982, ISBN 3-540-11895-0, S.6 u. 7, 41-44, 110-121

Cited By (14)

    Publication numberPublication dateAssigneeTitle
    DE-19512959-A1October 17, 1996Sel Alcatel AgFernüberwachungsvorrichtung
    DE-19826087-A1December 23, 1999Alcatel SaEinrichtung einer Endstelle eines Telekommunikationsnetzes
    DE-19826087-C2August 17, 2000Alcatel SaEinrichtung einer Endstelle eines Telekommunikationsnetzes
    EP-0738065-A1October 16, 1996Alcatel SEL AktiengesellschaftDispositif de télésurveillance
    EP-0964568-A2December 15, 1999Alcatel Alsthom Compagnie Generale D'electriciteÜberwachungseinrichtung und Endstelle eines Telekommunikationsnetzes
    EP-0964568-A3February 01, 2006Alcatel Alsthom Compagnie Generale D'electriciteDispositif de surveillance et terminal d'un réseau de télécommunication associé
    FR-2810775-A1December 28, 2001De Verneuil Francois HuardRapid response protected zone intruder protection system having protected zone digital image files transformed and time comparisons change detection files control centre sending/alerting response forces
    NL-1014735-C2September 25, 2001Lbl Trading CvAlarmeringswerkwijze en -inrichting.
    US-5717379-AFebruary 10, 1998Alcatel N.V.Remote monitoring system
    US-6167143-ADecember 26, 2000U.S. Philips CorporationMonitoring system
    US-7054415-B2May 30, 2006Marchfun International N.V.Alarm method and device
    WO-0063862-A1October 26, 2000Siemens AktiengesellschaftDetection d'intrusion par un visiophone
    WO-0173714-A1October 04, 2001Lbl Trading CvProcede et dispositif d'alarme
    WO-9720293-A1June 05, 1997David Antony Crellin, John Robert Crellin, Robert John DickinsonMethod and apparatus for generating a visual record