WO2008132334A1

WO2008132334A1 - Surveillance system

Info

Publication number: WO2008132334A1
Application number: PCT/FR2008/000320
Authority: WO
Inventors: Yann Dib
Original assignee: Gint
Priority date: 2007-03-13
Filing date: 2008-03-12
Publication date: 2008-11-06
Also published as: FR2913795B1; FR2913795A1

Abstract

The invention relates to a surveillance system (1) comprising a plurality of pieces of remote surveillance equipment (2) provided with at least one image capture device (4a, 4b, 4c, 4d) oriented to observe an area in the form of a corridor (5a, 5b, 5c, 5d), said image capture devices (4a, 4b, 4c, 4d) being disposed such that the observed corridor areas (5a, 5b, 5c, 5d), corresponding to each of the devices (4a, 4b, 4c, 4d), define a monitored enclosure (3). The system also includes image analysis means which provide information indicating if said corridor areas (5a, 5b, 5c, 5d) have been crossed.

Description

SURVEILLANCE SYSTEM

The present invention relates to the field of surveillance and more particularly to a monitoring system of a wide area.

In the prior art, anti-extrusion systems for monitoring zones are known. These systems are generally equipped with infrared barriers delimiting an enclave to be monitored. When a person crosses one of these barriers, an intrusion signal is then transmitted to the alarm means.

However, this anti-intrusion system is not very precise. Indeed, this type of system does not allow in particular to distinguish animal intrusions from human intrusions. In addition, this type of system does not allow certain types of intrusion. As a result, these systems cause nuisance alarms. In addition, these systems do not provide information on the nature of the intrusion.

There are also surveillance systems with video image capturing devices scanning the area to be monitored. However, scanning the zone does not allow you to monitor the entire area to be monitored at any time.

The invention aims to remedy these problems by providing an accurate monitoring system to provide accurate information on observed events and to inspect the entire area to be monitored. For this purpose, and according to a first aspect, the invention proposes a monitoring system comprising a plurality of remote monitoring equipment equipped with at least one image-capture device oriented to observe a zone in the form of a corridor, said devices image capture being arranged in such a way that the observed corridor areas corresponding to each of the devices delimit a monitored enclave, the system furthermore comprising image analysis means in order to provide information for crossing said zones corridor.

Thus, the whole area is monitored because as soon as an intrusion into the enclosed area is observed, crossing information is delivered. In addition, the device provides accurate information to prevent inadvertent tripping of alarm devices.

Advantageously, the monitoring system further comprises at least one mobile camera providing a scan of said monitored enclave and moving means of said controlled mobile camera according to the crossing information provided by the image analysis means.

Thus, the mobile camera take over the image capture devices to observe an intrusion and follow it as soon as crossing information is issued.

Advantageously, the device comprises means for adjusting the focusing of said mobile camera controlled according to the information provided by the means. image analysis.

In one embodiment of the invention, the image-sensing device oriented to observe a corridor-shaped zone has N objectives O _N monitoring the corridor-shaped zone, N being between 2 and 5, each of N objectives O _N being oriented to observe a portion P _N of the corridor zone extending between a distance D _{prox, N} and a distance D _{elo <N of} said device, D _{proXf N} ^{and D} _e i _{o, N} respectively being greater than D _proXj ^ ₁ and D _{elOj N-1} each objective O _N collecting an image I _N and having a focal length F _N determined so that the dimension of a reference object on the image I _N when placed in the center of the part P _N is substantially identical for all objectives O _N.

Thus, the image capture device makes it possible to maintain similar proportions between the object and its environment. Consequently, the image of an object obtained by means of the device according to the invention retains the quality necessary for an analysis treatment whatever the distance of the object from the device.

Advantageously, the image capture device comprises N cameras each equipped with one of said objectives O ₁ .

In one embodiment of the invention, the monitoring system comprises at least one mobile frame carrying at least one image capture device.

Advantageously, said mobile frame comprises a telescopic mast whose end carries said device for capture of images.

Advantageously, the mobile camera is carried by at least one of said mobile frame.

Other objects and advantages of the invention will become apparent from the description which follows, made with reference to the accompanying drawings, in which: FIG. 1 represents an example of a layout plan seen from above of a surveillance system according to the invention;

- Figure 2 is an overview of a mobile monitoring equipment;

FIG. 3 is a schematic view from above of a corridor zone monitored by an image capture device according to a particular embodiment of the invention; and

- Figure 4 is a schematic view of an image capture device according to a particular embodiment of the invention.

The monitoring system 1 illustrated in FIG. 1 comprises two remote monitoring equipment 2 arranged at two opposite corners of an area to be monitored 3.

Each monitoring equipment 2 comprises two image capture devices 4a, 4b, 4c, 4d oriented at 90 ° relative to each other and monitoring a corridor-shaped zone 5a, 5b, 5c, 5d. The four zones 5a, 5b, 5c, 5d in the form of a corridor delimit the contour of a zone to be monitored, also called an enclosed zone 3.

Thus, any person making an intrusion inside the enclosed area 3 is necessarily observed by one of the image capture devices 4a, 4b, 4c, 4d. It will be noted that the diagram of FIG. 1 illustrates an implementation of the surveillance system 1 by way of example. Indeed, the monitoring system 1 can also be used for monitoring an enclosed area 3 delimited in part by natural obstacles, building, relief, barrier.

In addition, when the extent of the area to be monitored is too large, several systems 3 according to the invention may be arranged squaring the zone 3 in order to limit the length of the zones in the corridor 5a, 5b, 5c, 5d monitored by the devices. 4a, 4b, 4c, 4d of image capture.

In addition, the system 1 comprises image analysis means, not shown, for providing information crossing a corridor area 5a, 5b, 5c, 5d. Said means use techniques for recognizing a shape, a speed, a spatial configuration or a type of movement. Thus, the crossing information of a zone in the corridor 5a, 5b, 5c, 5d can in particular include indications as to the position of the intruder, his speed or his size.

The system 1 further comprises at least one mobile camera 6 which sweeps the enclosed area 3. The purpose of this camera 6 is to take over from the image-capturing devices when the intruder has passed the zones in the corridor 4a. , 4b, 4c, 4d and is located in said enclosed area 3. In order to facilitate monitoring of the intruder when he is in the enclosed area 3, the zone crossing information provided by the image analysis means are used for ordering the moving camera 6. Thus, the moving means of the moving camera and / or the focusing adjustment means of the moving camera are controlled according to the information of position, speed and / or size of the intruder.

Consequently, the system according to the invention makes it possible to avoid a too long latency period during which the intruder would not be monitored, either by the image-capture devices 4a, 4b, 4c, 4d, or by the mobile camera 6.

In the embodiment shown, each monitoring equipment 2 is equipped with a mobile camera 6.

FIG. 2 represents surveillance equipment 2 provided with an image capture device 4a, 4b, 4c, 4d. The equipment 2 is constituted by a mobile frame 7 equipped with wheels 8 and allowing the system 1 to be configurable according to the characteristics of the area to be monitored 3.

The frame 7 is surmounted by a telescopic mat 9 at the end of which is fixed the image capture device 4a, 4b, 4c, 4d. In addition, the mast 9 can also support a mobile camera 6.

In order to transmit the images to a remote monitoring unit, the equipment 2 can be equipped with communication means, relying, for example, on radio wave technologies, such as Wifi or Bluetooth technologies, as well as on wireless technologies. satellite communication. In the embodiment illustrated in FIG. 4, the image capture device 4a, 4b, 4c, 4d comprises three cameras 10a, 10b, 10c. Note however that the invention is not limited to this embodiment, and may be provided a device 4a, 4b, 4c, 4d having N cameras, for example from 2 to 5. Each of the three cameras 10a, 10b, 10c is equipped with a lens which is oriented to observe part of the corridor zone 5a, 5b, 5c, 5d.

FIG. 4 schematically represents a zone in the corridor 5a, 5b, 5c, 5d monitored by a device 4a, 4b, 4c, 4d. In the embodiment shown, the corridor zone 5a, 5b, 5c, 5d extends over a length of 100 m, a width of about 5 m and a height of about 4.50 m.

To monitor this zone 5a, 5b, 5c, 5d, the first camera 10a is oriented to observe a portion P ₁ of the extended zone which extends over an interval of between 0 and 16.6 m, the second camera 10b is oriented to observe a portion P ₂ which extends over the interval between 10 m and 76.5 m and the third camera 10c is oriented to observe a portion P ₃ which extends over an interval extending between 45.8 m and 100 m.

Advantageously, the different parts P _N of the extended zone overlap in order to monitor the entire zone in the corridor on a minimum height.

The focal length F _N of the lenses of the cameras 10a, 10b, 10c is arranged so that the dimension of the same reference object is substantially identical when it is placed in the center of the corresponding part P _N. By substantially identical in the meaning of this document is meant image dimensions whose ratio is within a range allowing a precise use of image processing technologies. The ratio between the images of dimension "substantially identical" is for example of the order of 0.7 to 1.3.

In the example illustrated, the focal lengths F _N of the lenses of the cameras are as follows: first camera 10a → f _λ = 4.3 mm, second camera 10b → f ₂ = 7.3 mm and third camera 10c → f ₃ = 16 mm.

In a preferred embodiment, the device 4a, 4b, 4c, 4d further comprises means for aggregating the images obtained by the three cameras 10a, 10b, 10c, 10d to obtain a single image.

Claims

1 - Monitoring system (1) characterized in that it comprises a plurality of remote monitoring equipment (2) equipped with at least one image capture device (4a, 4b, 4c, 4d) oriented to observe a corridor-shaped area (5a, 5b, 5c, 5d), said image capturing devices (4a, 4b, 4c, 4d) being arranged in such a way that the observed corridor areas (5a, 5b, 5c, 5d), corresponding to each of the devices (4a, 4b, 4c, 4d) delimit a monitored enclave (3), the system further comprising image analysis means for providing information of crossing of said zones in the corridor ( 5a, 5b, 5c, 5d).

2 - System (1) for monitoring according to the claim

1, characterized in that it further comprises at least one mobile camera (6) providing a scan of said monitored enclave (3).

3 - System (1) for monitoring according to the claim

2, characterized in that it comprises moving means of said mobile camera (6) controlled according to the crossing information provided by the image analysis means.

4 - System (1) for monitoring according to one of claims 2 or 3, characterized in that it comprises means for adjusting the focus of said mobile camera (6) controlled according to the information provided by the means d ' image analysis. 5 - System (1) for monitoring according to one of claims 1 to 4, characterized in that the image-capturing device (4a, 4b, 4c, 4d) oriented to observe a zone in the form of a corridor (5a, 5b, 5c, 5d) has N objectives O _N monitoring the corridor-shaped zone (5a, 5b, 5c, 5d), N being between 2 and 5, each of the N objectives O _N being oriented to observe a portion P _N the corridor zone (5a, 5b, 5c, 5d) extending between a distance D _proX; "And a distance D _elo " of said device (4a, 4b, 4c, 4d), D _{prox # N} and D _{elO (N} being respectively greater than D _{proX / N} _ _j and D _elo> "_ _{! T} each objective O _N collecting an image I _N and having a focal length F _N determined so that the dimension of a reference object on the image I _N when placed in the center of the part P _N is substantially identical for all objectives O _N.

6 - System (1) for monitoring according to the preceding claim, characterized in that the image capture device 4a, 4b, 4c, 4d) comprises N cameras each equipped with one of said objectives O _N.

7 - System (1) for monitoring according to one of claims 1 to 6, characterized in that it comprises at least one mobile frame (7) carrying at least one image capture device (4a, 4b, 4c, 4d).

8 - System (1) for monitoring according to the claim

7, characterized in that said movable frame (7) comprises a telescopic mast (9) whose end carries said image capture device (4a, 4b, 4c, 4d).

9 - System (1) for monitoring according to the claim

8, characterized in that the moving camera (6) is carried by at least one of said mobile frame (7).