KR20160007039A - Method and apparatus for video surveillance by using pan-tilt-zoom camera - Google Patents

Abstract

Provided is an active image monitoring network which receives information on orientation and a viewing angle of a photographing zone by using a pan-tilt-zoom (PTZ) camera having a geomagnetic sensor embedded therein, and links the PTZ camera having the geomagnetic sensor embedded therein with a geographic information system (GIS) map, thereby actively monitoring an image. Accordingly, the present invention promptly propagates an alarm situation caused by an event which is detected by a specific PTZ camera to a plurality of PTZ cameras included in an image monitoring network, and changes a monitoring direction of each PTZ camera to an area required with the concentrated monitoring, thereby realizing a thorough monitoring system.

Description

TECHNICAL FIELD [0001] The present invention relates to a video surveillance method and apparatus using a PTZ camera,

The present invention relates to a video monitoring method and apparatus using a PTZ camera having a built-in geomagnetic sensor.

Pan-tilt-zoom (PTZ) The camera has built-in panning, vertical tilting, and zooming functions. A user of a PTZ camera can acquire an image of a surveillance region by panning, tilting, and zooming the camera using various interfaces provided by the manufacturer.

Normally, the PTZ camera can rotate 360 degrees horizontally by 0.1 to 0.01 degrees. At this time, when the panning value is 0, it is referred to as a zero position, which means the initial position, and when the camera is powered on, the camera is positioned at the zero position. Zero position can be determined at the time of camera design or production, and the panning 0 values of the PTZ cameras of the same model all mean the same position.

However, since cameras are installed in the surveillance area in different directions and positions, it is not possible to know the azimuths such as north, south, east, and west through the direction of the zero position that each camera faces. That is, a user who does not know the scenery or geographical information of the spot where the PTZ camera is installed can not know which direction the surveillance area is facing by viewing the image of the PTZ camera, and the user of the PTZ camera acquires the image of the desired direction through the PTZ operation A lot of time can be consumed.

Recently, a network video recorder (NVR) or a video management system (VMS) displays a plurality of IP cameras on a map of a geographic information system (GIS) Provide a service that can be viewed. However, information on the shooting direction is not clearly provided based on the location where the camera is installed. In some fixed cameras, the administrator can manually contrast the map and the image, but the direction information is somewhat inaccurate. If the direction of the camera can be adjusted, such as a PTZ camera, It is difficult to provide.

Therefore, in the embodiment of the present invention, the azimuth sensor and the PTZ camera are used to provide azimuth and viewing angle information to the photographing area, and the PTZ camera with the geomagnetic sensor is interfaced with the GIS map to actively monitor the image To provide an active video surveillance network.

According to an aspect of the present invention, a video surveillance method of a video surveillance system including a plurality of cameras is provided. The method comprising: propagating an alarm situation detected by a first camera among a plurality of cameras to a neighboring camera of the first camera; switching a monitoring direction of a neighboring camera of the first camera to a first camera; If the alarm condition is detected by the second camera, the alarm condition is propagated to the neighboring camera of the second camera, and the monitoring direction of the neighboring camera of the second camera is switched to the second camera.

In the video surveillance method, a plurality of cameras may be PTZ cameras.

The video surveillance method may further include displaying a plurality of cameras' positions, a surveillance direction, and a surveillance range on a GIS map.

In the video surveillance method, the step of propagating the alarm situation to the neighboring camera may include determining the neighboring camera based on the positions of the plurality of cameras displayed on the GIS map.

In the video surveillance method, the plurality of cameras include geomagnetism sensors, and the step of switching the surveillance direction of the neighboring cameras may include switching the surveillance direction based on the location information and the azimuth information obtained from the geomagnetism sensor.

The step of switching the surveillance direction of the neighboring camera in the video surveillance method includes the steps of obtaining geographical direction information of a point where the camera is located in the geomagnetism sensor and detecting the direction of the camera when the camera is in the zero position Calculating the azimuth, and calculating the azimuth of the surveillance direction using the azimuth at the zero position.

The video surveillance method may further include independently monitoring an area allocated to a plurality of cameras when the alarm condition is terminated.

According to another aspect of the present invention, there is provided an image monitoring apparatus for performing image surveillance. The image monitoring apparatus includes a geomagnetism sensor unit for obtaining north-north direction information at a location where the camera is located, a bearing calculation unit for calculating a bearing direction of the camera using the north-north direction information, A communication unit for receiving an alarm for the event, and a control unit for switching the monitoring direction of the camera in a direction in which the neighboring camera is located through the calculated direction when the alarm is received.

In the video surveillance apparatus, the camera may be a PTZ camera.

In the video surveillance apparatus, the communication unit may receive an alarm from a neighboring camera located at a next node of the video surveillance network topology generated through the GIS location information.

In the video surveillance apparatus, the azimuth calculation unit may calculate the azimuth when the camera is at the zero position using the zero position and the north direction information of the camera, and calculate the azimuth of the surveillance direction using the azimuth at the zero position.

As described above, according to the embodiment of the present invention, the user of the PTZ camera intuitively knows the direction in which the road or the like displayed on the image is located through the azimuth information displayed on the image. In addition, since the position, the surveillance region, and the surveillance direction of each PTZ camera can be displayed on the GIS map in real time, the blind spot of security can be minimized and the image security system can be effectively designed. In addition, the video surveillance network using the PTZ camera and the GIS map with the built-in geomagnetic sensor quickly propagates the alarm situation due to the event detected by the specific PTZ camera to the plurality of PTZ cameras included in the video surveillance network, It is possible to implement a thorough surveillance system by switching the monitoring direction of the surveillance system to the area requiring centralized surveillance.

1 is a block diagram showing a PTZ camera having a built-in geomagnetic sensor according to an embodiment of the present invention.
2 is a view showing an image taken by a PTZ camera having a built-in geomagnetic sensor according to an embodiment of the present invention.
3 is a view showing a PTZ camera displayed on a GIS map according to an embodiment of the present invention.
4 is a diagram illustrating a video surveillance network using a PTZ camera according to an embodiment of the present invention.
5A to 5E are top views of a video surveillance network connecting a plurality of PTZ cameras displayed on a GIS map according to an embodiment of the present invention.
6 is a flowchart illustrating a video surveillance method using a PTZ camera according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module," " module, "and " block" refer to units that process at least one function or operation, Lt; / RTI >

1 is a block diagram showing a PTZ camera having a built-in geomagnetic sensor according to an embodiment of the present invention.

1, a PTZ camera 100 according to an exemplary embodiment of the present invention includes a geomagnetism sensor unit 110, a azimuth calculation unit 120, a camera driving unit 130, a communication unit 140, .

The geomagnetism sensor unit 110 can provide the direction calculation unit 120 with the north-north direction information of the point where the PTZ camera 100 is located.

The azimuth calculation unit 120 calculates the azimuth of the direction in which the PTZ camera 100 is photographed using the north direction information provided by the geomagnetism sensor unit 110 and transmits the calculated azimuth value to the camera driving unit 130 have.

The azimuth calculation unit 120 calculates the azimuth when the PTZ camera 100 is at the zero position using the angular difference between the zero position and the north direction of the PTZ camera 100 and calculates the azimuth angle of the panning of the PTZ camera 100 the azimuth of the photographing direction of the PTZ camera 100 can be calculated using the angle difference between the panning angle and the zero position.

When the power of the camera is turned on, the camera driver 130 returns the position of the camera to the zero position. At this time, the azimuth calculation unit 120 calculates the angle difference (delta angle) between the north direction and the zero position provided by the geomagnetic sensor unit 110. When the delta angle is 0 degree, the camera's zero position indicates the north direction, and when the delta angle is 90 degrees, the camera's zero position indicates the forward direction.

In one embodiment of the present invention, the azimuth calculation unit 120 can calculate the azimuth of the camera in real time through the delta angle and the panning value when the panning value of the camera changes. For example, if the delta angle is 90 degrees and the panning value is 90 degrees, the orientation of the camera is 180 degrees (i.e.

The direction of the photographing direction of the PTZ camera 100 calculated by the azimuth calculation unit 120 may be a protocol such as an Open Network Video Interface Forum (ONVIF) or a protocol provided by the manufacturer of the PTZ camera 100 And may be provided to a user of the PTZ camera 100 using an application programming interface (API) or the like.

The camera driving unit 130 adjusts the panning angle of the PTZ camera 100 according to the azimuth value calculated by the azimuth calculation unit 120 and performs the panning, tilting, and zooming operations under the control of the control unit 150 have.

The communication unit 140 may receive an instruction for a monitoring direction from a user of the PTZ camera 100 or may receive an alarm for an event occurring in a surveillance area of another PTZ camera. That is, the video surveillance network can be formed by communicating with another PTZ camera through the communication unit 140 included in the PTZ camera 100. At this time, the communication unit 140 may receive an alarm for the event from the user of the PTZ camera, or may receive the alarm from the other PTZ camera.

The control unit 150 can control the camera driving unit 130 according to a user instruction received from the communication unit or an alarm of another PTZ camera. That is, if the user instructs to monitor a specific direction, the controller 150 may control the camera driver 130 to switch the monitoring direction of the PTZ camera 100. In addition, when an alarm is received from another PTZ camera, the control unit 150 can control the camera driving unit 130 to switch the monitoring direction toward another PTZ camera.

2 is a view showing an image taken by a PTZ camera having a built-in geomagnetic sensor according to an embodiment of the present invention.

Referring to FIG. 2, azimuth information is displayed on an image taken by a PTZ camera. The user of the PTZ camera can observe the road, buildings, vehicles and passersby around the road through the image of FIG. 2, and can recognize the direction of the road through the direction information and the direction of photographing the building by the PTZ camera.

According to an embodiment of the present invention, a user of the PTZ camera can intuitively recognize azimuth information such as roads displayed on an image through an elliptical plate 200 which is translucently displayed below the image.

3 is a view showing a PTZ camera displayed on a GIS map according to an embodiment of the present invention.

3, the GIS map according to the embodiment of the present invention may display a PTZ camera as a circle having a center 310 of the PTZ camera and a radius of the identification distance 320 of the PTZ camera .

At this time, the center angle 330 of the circular sector can display the angle of view of the PTZ camera. Accordingly, the sector 330 included in the PTZ camera source can indicate the area currently monitored by the PTZ camera. The angle of view can be determined according to the specification of the lens used in the PTZ camera, and can be determined in inverse proportion to the zoom magnification.

The identification distance d 320 can be calculated as shown in Equation 1 using the resolution u of the image, the horizontal size w of the image, and the angle of view of the PTZ camera.

At this time, the resolution can be calculated assuming that the image is 20 mm in one pixel.

According to an embodiment of the present invention, the position, the surveillance region, and the surveillance direction of each PTZ camera can be displayed on the GIS map in real time, thereby minimizing the security blind spot and effectively designing the video surveillance system. .

4 is a diagram illustrating a video surveillance network using a PTZ camera according to an embodiment of the present invention.

Referring to FIG. 4, the video surveillance network according to the embodiment of the present invention includes a plurality of PTZ cameras 100 installed at intersections and roads. At least one PTZ camera according to an embodiment of the present invention may be installed at an intersection, and a plurality of PTZ cameras may be installed on the road between intersections according to the identification distance of the PTZ camera.

FIGS. 5A to 5E are views showing a topology of a video surveillance network by connecting a plurality of PTZ cameras displayed in a GIS map according to an embodiment of the present invention, FIG. 6 is a diagram illustrating a topology of a PTZ camera according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a video surveillance method using a video signal. Hereinafter, an image monitoring method using a PTZ camera according to an embodiment of the present invention will be described with reference to FIGS. 5A through 5E and FIG.

First, in FIG. 5A, a plurality of PTZ cameras included in the video surveillance network monitor an area allocated through panning, tilting, and zooming operations (S601).

5B, an event is generated in the first PTZ camera 501 of the video surveillance network (S602), and an alarm situation of the first PTZ camera 501 is propagated to the adjacent node of the first PTZ camera 501 (S603). At this time, the alarm condition may be theft of the PTZ camera itself or the user determined by the PTZ camera, intrusion, inappropriate behavior, appearance of a specific person, and the like.

Next, the second to fourth PTZ cameras 502 to 504 which have propagated the alarm state become a centralized monitoring camera, and the centralized monitoring camera performs panning, tilting and zooming operations toward the first PTZ camera 501 as shown in FIG. 5C And switches the monitoring direction (S604).

At this time, each central monitoring camera can change the monitoring direction by calculating necessary values for panning, tilting, and zooming based on the orientation of the first PTZ camera 501 acquired from the azimuth sensor and the GIS information acquired from the geomagnetic sensor have.

5D, when the second PTZ camera 502 detects an event occurring in the first PTZ camera 501 (S605), the alarm condition is propagated again to the adjacent node of the second PTZ camera (S606) The first, fifth, and sixth PTZ cameras 501, 505, and 506 adjacent to the two PTZ cameras become the centralized surveillance cameras and switch the surveillance direction toward the second PTZ camera 502 (S607).

Subsequently, when the event ends (S608), each PTZ camera independently monitors the allocation area as shown in FIG. 5E.

As described above, according to the embodiment of the present invention, the video surveillance network using the PTZ camera and the GIS map with built-in geomagnetic sensor can detect an alarm situation due to an event detected by a specific PTZ camera by using a plurality of PTZ cameras included in the video surveillance network It is possible to implement a thorough surveillance system by switching the monitoring direction of each PTZ camera to the area requiring centralized monitoring.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (11)

A video surveillance method of a video surveillance system including a plurality of cameras,
Propagating an alarm situation detected by a first camera among the plurality of cameras to a neighboring camera of the first camera,
Switching the monitoring direction of the neighboring camera of the first camera to the first camera side,
Propagating the alarm condition to a neighboring camera of the second camera when the second camera of the neighboring camera detects the alarm condition, and
Switching the monitoring direction of the neighboring camera of the second camera to the second camera side
/ RTI > The method of claim 1,
Wherein the plurality of cameras are pan-tilt-zoom (PTZ) cameras. 3. The method of claim 2,
Displaying the positions, monitoring directions, and surveillance ranges of the plurality of cameras on a map of a geographic information system (GIS)
The method comprising the steps of: In paragraph 3
Wherein the step of propagating the alarm condition to the neighboring camera comprises:
Determining the neighboring camera based on the positions of the plurality of cameras displayed on the GIS map
/ RTI > 5. The method of claim 4,
The plurality of cameras including a geomagnetic sensor,
Wherein the switching of the monitoring direction of the neighboring camera comprises:
Switching the monitoring direction based on the position information and the azimuth information obtained from the geomagnetic sensor
/ RTI > The method of claim 5,
Wherein the switching of the monitoring direction of the neighboring camera comprises:
Obtaining geographical direction information of the geomagnetic sensor at a location where the camera is located,
Calculating the azimuth when the camera is at the zero position using the zero position and the north direction information of the camera, and
Calculating a bearing in the monitoring direction using the bearing at the zero position
The method comprising the steps of: The method of claim 1,
And monitoring the area allocated to the plurality of cameras independently when the alarm condition is terminated
The method comprising the steps of: A video surveillance apparatus for performing video surveillance,
A geomagnetism sensor unit for obtaining geomagnetism information of a point where the camera is located,
A direction calculation unit for calculating a direction of a direction monitored by the camera using the forward direction information,
A communication unit for receiving an alarm for an event occurring in a surveillance area of a neighboring camera of the camera,
When the alarm is received, controls the monitoring direction of the camera in the direction in which the neighboring camera is located through the calculated orientation,
Wherein the video monitoring device comprises: 9. The method of claim 8,
Wherein the camera is a pan-tilt-zoom (PTZ) camera. 9. The method of claim 8,
Wherein,
A video surveillance apparatus for receiving the alarm from a neighboring camera located at a next node of a video surveillance network topology generated through location information of a geographic information system (GIS). 9. The method of claim 8,
The azimuth calculation unit calculates,
Calculates the azimuth when the camera is at the zero position using the zero position and the north direction information of the camera, and calculates the azimuth of the surveillance direction using the azimuth at the zero position.

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