WO1998040855A1 - Video monitoring system for a surface area - Google Patents

Video monitoring system for a surface area Download PDF

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Publication number
WO1998040855A1
WO1998040855A1 PCT/DE1997/002485 DE9702485W WO9840855A1 WO 1998040855 A1 WO1998040855 A1 WO 1998040855A1 DE 9702485 W DE9702485 W DE 9702485W WO 9840855 A1 WO9840855 A1 WO 9840855A1
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WO
WIPO (PCT)
Prior art keywords
video
objects
evaluation device
view
video image
Prior art date
Application number
PCT/DE1997/002485
Other languages
German (de)
French (fr)
Inventor
Michael Meyer
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of WO1998040855A1 publication Critical patent/WO1998040855A1/en

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19639—Details of the system layout
    • G08B13/19641—Multiple cameras having overlapping views on a single scene
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19602—Image analysis to detect motion of the intruder, e.g. by frame subtraction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H04N13/239—Image signal generators using stereoscopic image cameras using two 2D image sensors having a relative position equal to or related to the interocular distance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/194—Transmission of image signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/296—Synchronisation thereof; Control thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N2013/0074—Stereoscopic image analysis
    • H04N2013/0081—Depth or disparity estimation from stereoscopic image signals

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • a scene is observed with a video image recording unit which delivers a video image sequence.
  • Moving objects are identified by analyzing the video image sequence.
  • this method also detects objects whose detection is not desired in security technology applications. These are, for example, moving shadows, moving beams of light, insects on the video camera lens.
  • objects that are not moving cannot be recognized become.
  • the purpose of the invention is a more reliable video-based detection of objects.
  • the device according to the invention with the features of the main claim has the following advantage.
  • the evaluation device is suitable for processing the steroscopic video information of the overlapping area of the detection areas of the video camera and the additional video means originating from both directions of view into three-dimensional video image signal sets and comparing them with corresponding reference signal sets of a three-dimensional reference model. This evaluation enables a much more robust object detection.
  • Objects can be measured (i.e. object height, width and distance can be determined), which significantly supports classification. A bird flying in front of the video cameras can be recognized as a very small and therefore irrelevant object.
  • FIG. 1 shows the basic structure of a device according to the invention
  • FIG. 2 shows the device over a perspective area to be monitored
  • FIG. 3 shows the area to be monitored with overlapping video image sections of the video cameras shown in FIG. 2
  • FIG. 4 shows two individually shown video image sections of the video cameras.
  • the invention is used to monitor an area of video images recorded at the same time by two video cameras which are installed at a fixed distance from one another in the area to be monitored.
  • FIG. 1 shows a device according to the invention for video-based monitoring of areas.
  • the facility consists of two Video cameras 1, a unit 3 for video image digitization and intermediate storage and from an evaluation computer 4 for video image evaluation.
  • a synchronization of the video cameras 1 is required to use stereoscopic methods.
  • line 2 is provided between the two video cameras 1. If necessary, one can be used for the evaluation computer 4
  • Communication interface 5 may be provided for connection to a central processing unit 6.
  • the video cameras 1 of the device according to the invention are mounted according to FIG. 2 above the area 14 to be monitored.
  • the two video cameras are attached to a mast 12 and cover a common area portion with their detection areas.
  • the aim is the detection and measurement of objects that are in this common detection area of both video cameras (example object 13).
  • the evaluation computer 4 and the unit 3 for video image digitization are located in a housing 15, which is accommodated at a suitable location.
  • the surface 14 and the object 13 are shown again in FIG.
  • the detection range of one and 16 the detection range of the other video camera are designated here by 16.
  • the two detection areas 16 and 17 overlap one another in an overlapped stereoscopic area (overlap area) 20.
  • Objects are only recognized within the overlap region 20. Scene areas that are only captured by one of the video cameras are not evaluated.
  • the two video cameras have to record the video images (at least approximately) at the same time. Such at the same time recorded, overlapping video images are used for the stereoscopic detection of objects.
  • the first processing step after the analog video image acquisition consists in the digitization of the two simultaneous video images. Unless special video cameras with their own digitization are used, this task is performed by unit 3.
  • the digitization step can be followed by further video image processing tasks such as filtering and subsampling for data reduction.
  • the actual video image evaluation takes place in an evaluation computer 4.
  • video image signal sets of the video image pairs are evaluated by using algorithms, such as those e.g. from Three-Dimension Computer Vision A Geometry Viewpoint, Olivier Faugeras, MIT-Press, Cambridge.
  • the basic idea here is to first determine reference image signal sets of a three-dimensional reference model of the surface of the scene in a short initialization phase without objects to be detected.
  • objects can be recognized in that the current scene situation deviates from the reference model.
  • objects that are located on an area to be monitored can be effectively distinguished from disturbance variables, such as shadows and reflections, since shadows and reflections do not change the spatial scene geometry.
  • Detected objects can be measured by using a three-dimensional reference model of the surface of the scene without objects to be detected. The height, width and distance of objects can be determined. Objects that are in the detection range of only one video camera, such as insects on one of the video camera lenses, can also be recognized as objects that cannot be detected. In the event of Detection of a relevant object can be given a suitable signal (alarm signal) by the evaluation computer 4.
  • a message can be sent to the central processing unit 6.
  • a serial connection, an ISDN, GSM or radio connection are suitable as communication interface 5, for example.
  • Video images of the scene to be monitored can also be transmitted.
  • Video images of the scene can be called up at any time from the central processing unit 6.
  • Video image compression methods can be used in an advantageous manner.
  • the device can also be used mobile.

Abstract

The invention relates to a video monitoring system for monitoring a surface (14). Said system comprises a video camera (1a) which optically monitors the surface from a particular angle of view and an evaluation unit (3, 4). In addition the invention provides for video means, in particular a second video camera (1b) for optically monitoring the same surface (14) from a different angle of view. The evaluation unit (3, 4) is designed to process the stereoscopic video information obtained from the two angles of view into groups of three-dimensional video image signals and to compare same with corresponding groups of reference signals of a three-dimensional reference model. By using two video cameras which simultaneously monitor an overlapping video image section, relevant objects (13) can be distinguished far more effectively from disturbance variables. It is also possible to detect not only moving but also immobile objects.

Description

Einrichtung zur Videoüberwachunσ einer FlächeDevice for video surveillance of an area
Stand der TechnikState of the art
Die Erfindung geht aus von einer Einrichtung nach der Gattung des Hauptanspruchs .The invention relates to a device according to the preamble of the main claim.
Es ist schon ein videobasiertes Verfahren vorgeschlagen worden (deutsche Patentanmeldung 19601005.5), das in einer Szene bewegte Objekte erkennt (mit einem sogenannten Videobewegungsmelder) .A video-based method has already been proposed (German patent application 19601005.5) that detects moving objects in a scene (using a so-called video motion detector).
In der Sicherheitstechnik, werden videobasierte Verfahren zur Erkennung von Objekten verwendet. Hierbei ist von zentraler Bedeutung, daß einerseits relevante Objekte (z.B. Personen oder Fahrzeuge) zuverlässig detektiert werden (d.h. zu einer Alarmierung führen), während andererseits Störgrößen (z.B. Videokamerarauschen, Insekten, Wind, Regen, Schnee, Schattenwurf, bewegte Lichtkegel, Spiegelungen) wirksam zu unterdrücken sind (d.h. nicht zu einer Alarmierung führen) .In security technology, video-based methods are used to recognize objects. It is of central importance here that on the one hand relevant objects (e.g. people or vehicles) are reliably detected (i.e. lead to an alarm), while on the other hand disturbances (e.g. video camera noise, insects, wind, rain, snow, shadows, moving light cones, reflections) are effective are to be suppressed (ie do not lead to an alarm).
Bei dem oben erwähnten, vorgeschlagenen Verfahren wird eine Szene mit einer Videobildaufnahmeeinheit beobachtet, welche eine Videobildfolge liefert. Durch eine Analyse der Videobildfolge werden bewegte Objekte erkannt. Dieses Verfahren detektiert in bestimmten Situationen auch Objekte, deren Erkennung in Anwendungen der Sicherheitstechnik nicht erwünscht ist . Dies sind z.B. bewegte Schatten, bewegte Lichtkegel, Insekten auf der Videokameralinse. Außerdem werden ausschließlich bewegte Objekte erkannt. Nicht bewegte Objekte hingegen können nicht erkannt werden. Zweck der Erfindung ist eine zuverlässigere videobasierte Detektion von Objekten.In the above-mentioned proposed method, a scene is observed with a video image recording unit which delivers a video image sequence. Moving objects are identified by analyzing the video image sequence. In certain situations, this method also detects objects whose detection is not desired in security technology applications. These are, for example, moving shadows, moving beams of light, insects on the video camera lens. In addition, only moving objects are recognized. However, objects that are not moving cannot be recognized become. The purpose of the invention is a more reliable video-based detection of objects.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Einrichtung mit den Merkmalen des Hauptanspruchs hat demgegenüber folgenden Vorteil.The device according to the invention with the features of the main claim has the following advantage.
Die Auswertungseinrichtung ist geeignet, die aus beiden Blickrichtungen stammenden steroskopischen Videoinformationen des fjberlappungsbereich.es der Erfassungsbereiche der Videokamera und der zusätzlichen Videomittel zu dreidimensionalen Videobildsignalsätzen zu verarbeiten und mit korrespondierenden Referenzsignalsätzen eines dreidimensionalen Referenzmodells zu vergleichen. Durch diese Auswertung ist eine wesentlich robustere Objekterfassung möglich.The evaluation device is suitable for processing the steroscopic video information of the overlapping area of the detection areas of the video camera and the additional video means originating from both directions of view into three-dimensional video image signal sets and comparing them with corresponding reference signal sets of a three-dimensional reference model. This evaluation enables a much more robust object detection.
Als weitere, daraus resultierende Vorteile sind anzusehen:The following advantages can be seen:
• Objekte, die nur auf einer der Videokameras abgebildet werden (wie z.B. Insekten), können als solche erkannt werden, und eine• Objects that are only imaged on one of the video cameras (such as insects) can be recognized as such, and one
Alarmierung kann vermieden werden.Alerting can be avoided.
• Die bisher bekannten videobasierten Detektionsverfahren reagieren nur auf bewegte Objekte. Durch die Verwendung der hier beschriebenen Einrichtung können auch unbewegte Objekte erkannt werden. Dies ist z.B. in Anwendungen relevant, in denen Hindernisse erkannt werden sollen. So können z.B. auf Bahnübergängen liegengebliebene Fahrzeuge erkannt werden. Auch Personen, die in gefährdeten Bereichen liegen oder stehen, können erkannt werden .• The previously known video-based detection methods only react to moving objects. By using the device described here, immobile objects can also be recognized. This is e.g. relevant in applications in which obstacles are to be recognized. For example, vehicles that have stopped at level crossings are recognized. People who are lying or standing in hazardous areas can also be recognized.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Einrichtung möglich. Besonders vorteilhaft ist :The measures listed in the dependent claims are advantageous further developments and improvements in Main claim specified facility possible. It is particularly advantageous:
• Objekte können vermessen werden (d.h. Objekthöhe, -breite und entfernung können ermittelt werden) , wodurch eine Klassifizierung wesentlich unterstützt wird. Ein vor den Videokameras fliegender Vogel kann dadurch als sehr kleines und somit irrelevantes Objekt erkannt werden.• Objects can be measured (i.e. object height, width and distance can be determined), which significantly supports classification. A bird flying in front of the video cameras can be recognized as a very small and therefore irrelevant object.
• Objekte ohne Volumen (z.B. Schatten, Spiegelungen, wandernde Lichtkegel) können als solche erkannt werden, und eine Alarmierung durch solche Objekte kann wirksam unterdrückt werden .• Objects without volume (e.g. shadows, reflections, wandering light cones) can be recognized as such, and alarming by such objects can be effectively suppressed.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert . Es zeigen Figur 1 den grundsätzlichen Aufbau einer erfindungsgemäßen Einrichtung, Figur 2 die Einrichtung über einer perspektivisch dargestellten, zu überwachenden Fläche, Figur 3 die zu überwachende Fläche mit einander überlappenden Videobildausschnitten der in Figur 2 dargestellten Videokameras und Figur 4 zwei einzeln dargestellte Videobildausschnitte der Videokameras .An embodiment of the invention is shown in the drawings and explained in more detail in the following description. 1 shows the basic structure of a device according to the invention, FIG. 2 shows the device over a perspective area to be monitored, FIG. 3 shows the area to be monitored with overlapping video image sections of the video cameras shown in FIG. 2, and FIG. 4 shows two individually shown video image sections of the video cameras.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die Erfindung bedient sich zur Überwachung einer Fläche zeitgleich aufgenommener Videobilder zweier Videokameras, die in einem festen Abstand voneinander bei der zu überwachenden Fläche installiert sind.The invention is used to monitor an area of video images recorded at the same time by two video cameras which are installed at a fixed distance from one another in the area to be monitored.
Figur 1 zeigt eine erfindungsgemäße Einrichtung zur videobasierten Überwachung von Flächen. Die Einrichtung besteht aus zwei Videokameras 1, einer Einheit 3 zur Videobilddigitalisierung und zur Zwischenspeicherung sowie aus einem Auswerterechner 4 für die Videobildauswertung. Eine Synchronisation der Videokameras 1 ist zur Anwendung stereoskopischer Verfahren erforderlich. Hierzu ist die Leitung 2 zwischen den beiden Videokameras 1 vorgesehen. Bei Bedarf kann für den Auswerterechner 4 eineFIG. 1 shows a device according to the invention for video-based monitoring of areas. The facility consists of two Video cameras 1, a unit 3 for video image digitization and intermediate storage and from an evaluation computer 4 for video image evaluation. A synchronization of the video cameras 1 is required to use stereoscopic methods. For this purpose, line 2 is provided between the two video cameras 1. If necessary, one can be used for the evaluation computer 4
Kommuikationschnittstelle 5 zur Verbindung mit einer zentralen Recheneinheit 6 vorgesehen sein.Communication interface 5 may be provided for connection to a central processing unit 6.
Die Videokameras 1 der erfindungsgemäßen Einrichtung werden nach Figur 2 oberhalb der zu überwachenden Fläche 14 montiert. Die beiden Videokameras sind an einem Mast 12 befestigt und überdecken mit ihren Erfassungsbereichen einen gemeinsamen Flächenanteil . Ziel ist die Erkennung und Vermessung von Objekten, die sich in diesem gemeinsamen Erfassungsbereich beider Videokameras befinden (Beispiel Objekt 13) . Der Auswerterechner 4 und die Einheit 3 zur Videobilddigitalisierung befinden sich in einem Gehäuse 15, das an geeigneter Stelle untergebracht wird.The video cameras 1 of the device according to the invention are mounted according to FIG. 2 above the area 14 to be monitored. The two video cameras are attached to a mast 12 and cover a common area portion with their detection areas. The aim is the detection and measurement of objects that are in this common detection area of both video cameras (example object 13). The evaluation computer 4 and the unit 3 for video image digitization are located in a housing 15, which is accommodated at a suitable location.
In Figur 3 ist nochmals die Fläche 14 und das Objekt 13 dargestellt. Hier ist mit 16 der Erfassungsbereich der einen und mit 17 der Erfassungsbereich der anderen Videokamera bezeichnet. Die beiden Erfassungsbereiche 16 und 17 überlappen einander in einem überlappten Stereoskopiebereich (Überlappungsbereich) 20.The surface 14 and the object 13 are shown again in FIG. The detection range of one and 16 the detection range of the other video camera are designated here by 16. The two detection areas 16 and 17 overlap one another in an overlapped stereoscopic area (overlap area) 20.
Figur 4 stellt schließlich die Videobilder 18 und 19 der beiden Videokameras dar. Im Videobild 18 einer der Videokameras wird das Objekt an einer anderen Position als im Videobild 19 der anderen Videokamera abgebildet .4 finally shows the video images 18 and 19 of the two video cameras. In the video image 18 of one of the video cameras, the object is shown at a different position than in the video image 19 of the other video camera.
Nur innerhalb des Überlappungsbereichs 20 werden Objekte erkannt. Szenenbereiche, die nur von einer der Videokameras erfaßt werden, werden nicht ausgewertet. Für die Anwendung des erfindungsmäßigen Verfahrens müssen die beiden Videokameras die Videobilder (wenigstens annähernd) zeitgleich aufnehmen. Solche zeitgleich aufgenommenen, überlappenden Videobilder werden für die stereoskopische Erfassung von Objekten verwendet.Objects are only recognized within the overlap region 20. Scene areas that are only captured by one of the video cameras are not evaluated. To use the method according to the invention, the two video cameras have to record the video images (at least approximately) at the same time. Such at the same time recorded, overlapping video images are used for the stereoscopic detection of objects.
Der erste Verarbeitungsschritt nach der analogen Videobildaufnahme besteht in der Digitalisierung der beiden zeitgleichen Videobilder. Soweit nicht spezielle Videokameras mit eigener Digitalisierung verwendet werden, wird diese Aufgabe von der Einheit 3 wahrgenommen. Dem Digitalisierungsschritt können sich weitere Videobildverarbeitungsaufgaben wie Filterung und Unterabtastung zur Datenreduktion anschließen.The first processing step after the analog video image acquisition consists in the digitization of the two simultaneous video images. Unless special video cameras with their own digitization are used, this task is performed by unit 3. The digitization step can be followed by further video image processing tasks such as filtering and subsampling for data reduction.
Die eigentliche Videobildauswertung erfolgt in einem Auswerterechner 4. Dort werden Videobildsignalsätze der Videobildpaare durch Anwendung von Algorithmen ausgewertet, wie sie z.B. aus Three-Dimension Computer Vision A Geometrie Viewpoint, Olivier Faugeras, MIT-Press, Cambridge, bekannt sind. Grundidee hierbei ist es, in einer zeitlich kurzen Initialisierungsphase zunächst Referenzbildsignalsätze eines dreidimensionalen Referenzmodells der Oberfläche der Szene ohne zu detektierende Objekte zu ermitteln. In einer, der Initialisierungsphase folgenden Detektionsphase können Objekte dadurch erkannt werden, daß die aktuelle Szenensituation vom Referenzmodell abweicht. Hierdurch können Objekte, die sich auf einer zu überwachenden Fläche befinden, wirksam von Störgrößen, wie Schattenwürfe und Spiegelungen unterschieden werden, da Schattenwürfe und Spiegelungen die räumliche Szenengeometrie nicht verändern .The actual video image evaluation takes place in an evaluation computer 4. There, video image signal sets of the video image pairs are evaluated by using algorithms, such as those e.g. from Three-Dimension Computer Vision A Geometry Viewpoint, Olivier Faugeras, MIT-Press, Cambridge. The basic idea here is to first determine reference image signal sets of a three-dimensional reference model of the surface of the scene in a short initialization phase without objects to be detected. In a detection phase following the initialization phase, objects can be recognized in that the current scene situation deviates from the reference model. In this way, objects that are located on an area to be monitored can be effectively distinguished from disturbance variables, such as shadows and reflections, since shadows and reflections do not change the spatial scene geometry.
Dadurch, daß ein dreidimensionales Referenzmodell der Oberfläche der Szene ohne zu detektierende Objekte verwendet wird, können detektierte Objekte vermessen werden. Die Höhe, Breite und Entfernung von Objekten kann bestimmt werden. Objekte, die sich im Erfassungsbereich nur einer Videokamera befinden, wie z.B. Insekten auf einer der videokameralinsen, können ebenfalls als nicht zu detektierende Objekte erkannt werden. Für den Fall der Detektion eines relevanten Objektes kann von dem Auswerterechner 4 ein geeignetes Signal (Alarmsignal) abgegeben werden.Detected objects can be measured by using a three-dimensional reference model of the surface of the scene without objects to be detected. The height, width and distance of objects can be determined. Objects that are in the detection range of only one video camera, such as insects on one of the video camera lenses, can also be recognized as objects that cannot be detected. In the event of Detection of a relevant object can be given a suitable signal (alarm signal) by the evaluation computer 4.
Bei Verwendung einer Kommunikationsschnittstelle 5 kann eine Meldung an die zentrale Recheneinheit 6 erfolgen. Als Kommunikationsschnittelle 5 sind beispielsweise eine serielle Verbindung, eine ISDN-, GSM- oder Funkverbindung geeignet. Hierbei können auch Videobilder von der zu überwachenden Szene übertragen werden .When using a communication interface 5, a message can be sent to the central processing unit 6. A serial connection, an ISDN, GSM or radio connection are suitable as communication interface 5, for example. Video images of the scene to be monitored can also be transmitted.
Von der zentralen Recheneinheit 6 können jederzeit Videobilder von der Szene abgerufen werden. Hierbei könnenVideo images of the scene can be called up at any time from the central processing unit 6. Here you can
Videobildkompressionsverfahren in vorteilhafter Weise eingesetzt werden. Bei Verwendung einer GSM- oder Funkverbindung kann die Einrichtung auch mobil eingesetzt werden. Video image compression methods can be used in an advantageous manner. When using a GSM or radio connection, the device can also be used mobile.

Claims

Ansprüche Expectations
1. Einrichtung zur Videoüberwachung einer Fläche (14), mit einer Videokamera (la) , welche die Fläche (14) aus einem bestimmten Blickwinkel optisch erfaßt, und einer Auswertungseinrichtung1. Device for video surveillance of a surface (14), with a video camera (la), which optically detects the surface (14) from a certain point of view, and an evaluation device
(3, 4) , dadurch gekennzeichnet, daß Videomittel (lb) zur optischen Erfassung derselben Fläche (14) aus einem anderen Blickwinkel vorgesehen sind und die Auswertungseinrichtung (3, 4) geeignet ist, die aus beiden Blickrichtungen stammenden stereoskopischen Videoinformationen zu dreidimensionalen Videobildsignalsätzen zu verarbeiten und mit korrespondierenden Referenzsignalsätzen eines dreidimensionalen Referenzmodells zu vergleichen.(3, 4), characterized in that video means (lb) are provided for optically capturing the same surface (14) from a different point of view and the evaluation device (3, 4) is suitable for adding the stereoscopic video information originating from both viewing directions to three-dimensional video image signal sets process and compare with corresponding reference signal sets of a three-dimensional reference model.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Videomittel aus einer zweiten Videokamera (lb) bestehen.2. Device according to claim 1, characterized in that the video means consist of a second video camera (lb).
3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Auswertungseinrichtung (3, 4) einen Ausgang (Schnittstelle 5) aufweist für Alarmsignale, welche aufgrund des Vergleiches der Videobildsignalsätze mit den Referenzsignalsätzen abgegeben werden .3. Device according to claim 1 or 2, characterized in that the evaluation device (3, 4) has an output (interface 5) for alarm signals which are emitted due to the comparison of the video image signal sets with the reference signal sets.
4. Einrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Auswertungseinrichtung (3, 4) derart aufgebaut ist, daß sie keine Alarmsignale abgibt, wenn nur die in Anspruch 1 genannte Videokamera (la) oder nur die Videomittel (lb) ein Objekt (13) erfaßt haben. 4. Device according to one of the preceding claims, characterized in that the evaluation device (3, 4) is constructed such that it emits no alarm signals if only the video camera (la) mentioned in claim 1 or only the video means (lb) an object (13) have detected.
5. Einrichtung nach einem der vorangehenden Ansprüche , dadurch gekennzeichnet, daß die Auswertungseinrichtung (3, 4) derart aufgebaut ist, daß sie keine Alarmsignale abgibt, wenn ein vom Referenzmodell abweichendes, stereoskopisch erfaßtes Objekt (13) keine Ausdehnung senkrecht zu der überwachten Fläche (14) hat.5. Device according to one of the preceding claims, characterized in that the evaluation device (3, 4) is constructed such that it emits no alarm signals when a stereoscopically detected object (13) deviating from the reference model has no extent perpendicular to the monitored area ( 14) has.
6. Einrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Auswertungseinrichtung (3, 4) derart aufgebaut ist, daß sie keine Alarmsignale abgibt, wenn ein vom Referenzmodell abweichendes, stereoskopisch erfaßtes Objekt6. Device according to one of the preceding claims, characterized in that the evaluation device (3, 4) is constructed such that it emits no alarm signals when a stereoscopic object detected from the reference model
(13) eine Mindestgröße unterschreitet. (13) falls below a minimum size.
PCT/DE1997/002485 1997-03-10 1997-10-25 Video monitoring system for a surface area WO1998040855A1 (en)

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