WO2009013413A2 - Procede de reperage de cameras d'un reseau et procede d'exploitation d'un tel reseau - Google Patents
Procede de reperage de cameras d'un reseau et procede d'exploitation d'un tel reseau Download PDFInfo
- Publication number
- WO2009013413A2 WO2009013413A2 PCT/FR2008/000880 FR2008000880W WO2009013413A2 WO 2009013413 A2 WO2009013413 A2 WO 2009013413A2 FR 2008000880 W FR2008000880 W FR 2008000880W WO 2009013413 A2 WO2009013413 A2 WO 2009013413A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- camera
- cameras
- mobile
- location
- field
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
Definitions
- the present invention relates to a method of identifying cameras of a network of cameras dispersed in a place and a method of operating such a network. These methods are for example implemented for the video surveillance of a building.
- An object of the invention is to simplify the operations of identifying the cameras of a camera network and to optimize operation thereof.
- the method comprises the step of deriving a topography of the place from the appearances and disappearances detected.
- the location step includes the phase of locating an entry of the place in the field of said camera and, when the mobile disappears from the field of view.
- the locating step includes the phase of locating an exit of the place in the field of the camera whose detection module has detected the disappearance.
- the invention also relates to a method for operating a network of cameras dispersed in a location and connected to at least one display screen, each camera having a field that covers a zone of the place and being associated with a module of pattern detection, the operation of the network comprising a tracking operation of a mobile in the place, this operation comprising the steps of processing images of a first camera in the field of which the mobile is located, to determine by the shape detection module of the first camera a direction of movement of the mobile, to determine a second camera adjacent the first camera according to this direction of movement according to a predetermined location of the cameras relative to each other, and to process images of the second camera.
- the image processing can be for example a storage of images and / or a display thereof.
- the image processing can be for example a storage of images and / or a display thereof.
- the method comprises a step of determining statistically frequent mobile movements and deducing a display order of the fields of the cameras during the tracking operation.
- the method comprises the step of triggering a tracking operation when a mobile is detected, for the first time, by a camera whose field does not cover an entry of the place and / or the method comprises the step of identifying a camera-covered area as prohibited and the step of initiating a tracking operation when a mobile is detected in that area.
- the methods of the invention are described in application to the video surveillance of a building 100 and are implemented from a network 1 comprising here 8 cameras 2. i (i varying from 1 to 8). Each camera 2.i has a field 3.i (symbolized in double dotted line) covering an area 101. i of the building 100. The cameras 2.i are here fixed fixed-focus cameras.
- the cameras 2.i are each associated with a shape detection module 4.i, known in itself, adapted to detect a moving shape in the field of the camera 2.i and to determine a direction of displacement.
- the detection module 4.i can be incorporated in the camera 2.i or independent thereof.
- the cameras 2.i are connected, by wired or air transmission means known per se, to a processing unit 5 which is arranged in a control room 102, here away from the building 100, and is connected to to a screen 6 visible by a supervisor.
- the network 1 is here in a star, each camera 2.i being connected directly to the processing unit 5.
- the processing unit 5 is here a computer unit integrating at least one processor arranged to process data and to make calculations on these and a memory for storing data. After the connection of the cameras 2.i of the network 1 to the processing unit 5, the cameras 2 are identified.
- the marking method according to the invention starts with the step of making the place travel. to a mobile, here an operator, so that it passes throughout the building 100.
- Each appearance and each disappearance of the mobile in the field 3.i of each of the cameras 2. i are detected by the detection module 4.i and are listed by the processing unit 5 with the time they intervened. It is thus established a chronology of appearances and disappearances detected. This timeline is used to derive a location of cameras 2. i relative to each other.
- the chronology makes it possible to show that the mobile was found simultaneously in the field 3.2 of the camera 2.2 and in the field 3.3 of the camera 2.3. It is deduced that the camera 2.2 is adjacent to the camera 2.3. It is also inferred that cameras 2.2 and 2.3 have overlapping fields.
- a mobile phone and stereoscopic self-calibration techniques known per se it is possible to deduce the geometry of the positioning of the cameras.
- Two cameras are also identified as adjacent when the mobile has been detected immediately by the two cameras. It is also the same when the mobile disappears from the field 3.4 of the camera 2.4 to appear in the field 3.5 of the camera 2.5.,
- the location step includes the phase of identifying these cameras as adjacent. A delay between the appearance of the mobile in the field 3.5 and the disappearance of the mobile field 3.4 reveals that a zone is not covered between these two cameras.
- Information on the positioning of the cameras 2.i with respect to the building 100 can also be drawn from the timeline.
- the first camera 2.i for example the camera 2.1, whose detection module 4.1 detects the mobile is close to an entry 103 of the building.
- the entry can then be located in a specific area of the field 3.1 of the camera 2.1, namely at the very location of the appearance of the mobile.
- the camera 2.7 is identified as being close to the exit 104. If the mobile disappears in the field 3.7 without having crossed completely, the output 104 is located at the location of the disappearance of the mobile.
- the identification can be carried out using a learning technique such as Markhov chains or transition probabilities.
- the operation of monitoring the individual comprises the steps of displaying on the screen 6 the field of the camera in which the individual is located (for example the camera 2.2), to determine by the detection module 4.2 a direction of movement of the individual, to determine a camera adjacent to the camera 2.2 according to this direction of movement (for example here the camera 2.3) according to the predetermined location of the cameras 2. i relative to each other, and to display on the screen 6 the 3.3 camera field 2.3 adjacent as soon as the individual is detected in it, and so on.
- the follow-up operation is thus automatically performed without intervention of the supervisor.
- the monitoring operation is for example triggered at the request of the supervisor who will point on the screen the individual to follow, or automatically, for example when the camera first detecting the individual is not the one that has been identified such as covering the input 103, or even when a camera detects an individual in a predetermined area identified as being prohibited for example at certain times of the day. Alternatively, it is possible that this detection causes moreover the emission of an alert.
- Other rules for triggering a follow-up operation and / or an alert can be envisaged, such as the intrusion of a mobile into the building at a given period of time (irrespective of which camera has detected the mobile).
- the processing unit 5 is programmed to perform this operation by forwarding by the cameras 2.i individuals adapted to be recognized by the detection modules 4. i to be able to determine their path in the building 100.
- the processing unit will collect these paths in the form for example of the series of cameras having successively detected the individuals in question and will determine one or more frequent paths, possibly according to the time, the day (week or weekend) or of the period (closing of the building, opening of the building) ...
- the most frequent path may be used to derive the appropriate adjacent camera or even a display order of the fields of the cameras 2.i in which the individual has a high probability of passing.
- the tracking operation When the cameras have been grouped into groups, it is possible for the tracking operation to search for the adjacent camera in the group to which the first camera belongs and then, if no camera in this group is suitable, to search for a camera. adjacent in the adjacent group.
- the method comprises the step of issuing an alert when a mobile movement does not correspond to one of statistically frequent mobile movements. It is thus possible to detect an "abnormal" behavior of a mobile and to alert the operator and / or to trigger a monitoring operation simultaneously.
- the alert threshold will be determined according to the novelty or the relatively low frequency of the corresponding displacement.
- the videos captured by the cameras 2 i are recorded in the processing unit 5 or in a database attached thereto. Videos resulting from a tracking operation are preferably stored and archived for example depending on the area in which the mobile where the individual has entered abnormally.
- the invention is not limited to the embodiment described but encompasses any variant within the scope of the invention as defined by the claims.
- the cameras can be connected to several screens.
- the cameras may be motorized and / or variable zoom mobile cameras.
- the triggering of a monitoring operation may be accompanied by the issuance of an alert.
- the triggering of a monitoring operation may be accompanied by the issuance of an alert.
- two cameras simultaneously have the mobile in their field it is possible to calibrate operating parameters of these two cameras (color calibration for example).
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0921631.8A GB2462400B (en) | 2007-06-27 | 2008-06-23 | A method of identifying cameras in a network and a method of operating such a network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0704630 | 2007-06-27 | ||
FR0704630A FR2918237B1 (fr) | 2007-06-27 | 2007-06-27 | Procede de reperage de cameras d'un reseau et procede d'exploitation d'un tel reseau. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009013413A2 true WO2009013413A2 (fr) | 2009-01-29 |
WO2009013413A3 WO2009013413A3 (fr) | 2009-03-19 |
Family
ID=38963217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2008/000880 WO2009013413A2 (fr) | 2007-06-27 | 2008-06-23 | Procede de reperage de cameras d'un reseau et procede d'exploitation d'un tel reseau |
Country Status (3)
Country | Link |
---|---|
FR (1) | FR2918237B1 (fr) |
GB (1) | GB2462400B (fr) |
WO (1) | WO2009013413A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT511968B1 (de) * | 2011-10-25 | 2013-04-15 | Ait Austrian Inst Technology | Verfahren zur bestimmung der position von kameras |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1489847A2 (fr) * | 2003-06-18 | 2004-12-22 | Matsushita Electric Industrial Co., Ltd. | Système de vidéo surveillance, appareil de composition de vidéo surveillance, et serveur de vidéo surveillance |
-
2007
- 2007-06-27 FR FR0704630A patent/FR2918237B1/fr active Active
-
2008
- 2008-06-23 WO PCT/FR2008/000880 patent/WO2009013413A2/fr active Application Filing
- 2008-06-23 GB GB0921631.8A patent/GB2462400B/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1489847A2 (fr) * | 2003-06-18 | 2004-12-22 | Matsushita Electric Industrial Co., Ltd. | Système de vidéo surveillance, appareil de composition de vidéo surveillance, et serveur de vidéo surveillance |
Also Published As
Publication number | Publication date |
---|---|
GB2462400A (en) | 2010-02-10 |
FR2918237B1 (fr) | 2009-09-18 |
GB0921631D0 (en) | 2010-01-27 |
FR2918237A1 (fr) | 2009-01-02 |
GB2462400B (en) | 2012-10-24 |
WO2009013413A3 (fr) | 2009-03-19 |
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