KR101503347B1 - CCTV System Using Sound Detection and Surveillance Method thereof - Google Patents

Abstract

The present invention relates to a security CCTV system, which can accurately photograph a noise source using a camera, and a surveillance method thereof. The security CCTV system of the present invention can detect the position of a noise source of noise generated in a surveillance area using a microphone disposed in a three-dimensional space and can photograph the noise source by rotating a camera in the direction of the detected noise source. At this time, the calculated position of the noise source is based on the position of the microphone. Therefore, the CCTV system of the present invention enables the camera to accurately photograph the noise source by checking the position information of the camera by a proposed method and correcting the position information of the noise source using the position information of the camera.

Description

[0001] The present invention relates to a surveillance CCTV system and a surveillance method thereof,

The present invention relates to a system for calculating a position of a noise source according to a sound source recognition method and photographing a noise source with a camera, and more particularly, to a security CCTV system and a monitoring method thereof in which the direction of a noise source can be accurately obtained based on a camera.

PTZ (Pan Tilt Zoom) A method of recognizing an object in a system that recognizes and tracks a specific object by arranging a camera is mainly a method of recognizing an object through image processing and a method of recognizing an object through speech recognition . Among them, a method of recognizing an object by speech recognition is to place a plurality of microphones on a three-dimensional space to three-dimensionally recognize a direction in which sound is generated in a space, and to panning or tilting the camera ) Have been mainly used.

Korean Patent Laid-Open No. 10-2010-0121086 discloses an invention related to PTZ camera control using voice recognition. According to the present invention, the camera operating system measures a distance between an angle to a sound source and a sound source generating point from a preset distance from any one point of the two-dimensional space through 360 ° in all directions through a plurality of sound source detecting means, A camera for photographing and generating moving picture information or enlarged moving picture information by an optical lens by rotating the optical lens in a direction corresponding to sound source generation position information through rotation control means, And a remote server for outputting the moving picture information or the enlarged moving picture information received through the communication network through the display means and outputting the sound information contained in the moving picture information or the enlarged moving picture information through the sound output means.

However, even in the present invention, a device (or a configuration) for detecting a sound source may be disposed spaced apart from the PTZ controller or the camera actually performing the photographing. In this case, when the calculated sound source generating position is applied as it is, the sound source may not come to the center of the image captured by the camera, or the camera may not be able to capture the sound source itself. Therefore, in order to accurately photograph the noise source, the position of the sound source must be corrected again by a geometrical calculation method as much as the spatial separation between the device for detecting the sound source and the camera. This geometric correction method can be simple.

The problem is that after installing the sound source detecting device and the camera, the distance between the sound source detecting device and the camera must be accurately calculated and set, which is not easy.

[Related Prior Art]

1. Tracking of shot images using sound source recognition PTZ camera operation system (Korean Patent Laid-Open No. 10-2010-0121086)

An object of the present invention is to provide a CCTV system for security and a surveillance system using the sound source detecting means for calculating a direction of a noise source by using a sound source detecting means and rotating the camera in the direction of the calculated noise source, Method.

Another object of the present invention is to provide a sound source detecting method capable of accurately detecting a noise source by correcting a direction of a noise source identified as a sound source by confirming a degree of spatial separation of the sound source detecting means and a camera, A security CCTV system and a monitoring method thereof.

According to an aspect of the present invention, there is provided a security CCTV system including a pan tilt zoom camera for photographing a surveillance region and generating an image, a microphone, a sound source detection unit, a camera angle control unit, and a camera position confirmation unit.

The sound source detection unit processes the audio signal obtained using the plurality of microphones, calculates the position information of the surrounding noise source in the microphone reference, and corrects the position information in the camera reference using the preset camera position information. The camera angle control unit controls the camera to photograph the noise source based on the corrected position information provided by the sound source detection unit.

Wherein the camera position check unit controls the camera to output the predetermined detection-audio in the setting mode, and the sound source detection unit recognizes the detection-audio and outputs the detection result to the camera position And controls to calculate and set information.

In order to set the camera position information, the pan / tilt zoom camera of the present invention may further include a separate audio output unit for outputting the audio for detection belonging to the invisible frequency band.

However, according to the embodiment, the camera position check unit can control the camera to generate a noise corresponding to the detection-audio in the rotation process by rotating the camera in a predetermined pattern. On the other hand, it is preferable that the camera position confirming unit repeats the rotation of the pattern a plurality of times until receiving the detection completion notification from the sound source detecting unit.

According to another embodiment, the CCTV system of the present invention may further include an image processor capable of recognizing an identifier displayed on one side of the plurality of microphones from an image provided by the camera. In this case, in the setting mode, the camera position confirming unit controls the camera to photograph the microphone using the camera position information calculated by the sound source detecting unit, and when the image processing unit recognizes the identifier at the center of the image It can be determined that the calculation of the camera position information is completed.

The entire surveillance method of a security CCTV system according to this embodiment includes a first step of capturing a surveillance area in a predetermined basic attitude by a pan / tilt zoom camera, A second step of calculating position information of a surrounding noise source based on the position of the microphone based on the audio signal obtained by the sound source detection unit using a plurality of microphones; A third step of the sound source detection unit correcting the position information of the noise source to position information based on predetermined camera position information; And a fourth step of controlling the camera angle control unit to photograph the noise source by rotating the camera based on the corrected position information provided by the sound source detection unit.

The crime prevention CCTV system of the present invention basically captures an image in the monitoring space and provides it to the control center. Further, a plurality of microphones disposed in the vicinity of the camera are used to detect noise generated in the surveillance region, to detect the direction of the noise source from the noise, to rotate the camera in the detected direction, can do.

At this time, since the direction of the detected noise source is based on the position of the microphone, the CCTV system of the present invention can automatically detect the position information of the camera and correct the position information of the noise source to the position information based on the camera position . Since the position information of the noise source thus corrected is based on the position of the camera, the camera can accurately photograph the noise source.

Meanwhile, the voice recognition technique may be used as it is for the detection of the camera position information. In one embodiment of the present invention, the system of the present invention includes an audio processing unit for outputting audio data by using a unique sound system of the camera, no need.

In addition, since the position of the camera is confirmed by the speech recognition technique, it is not necessary to consider the fixed position with the microphone when the camera is installed on the field, which is very advantageous for field installation.

1 is a block diagram of a security CCTV system through sound source detection according to an embodiment of the present invention;
2 is a perspective view illustrating a camera, a microphone, and a sound source detection unit included in the CCTV system of the present invention.
FIG. 3 is a perspective view illustrating the microphone unit and the sound source detection unit in more detail according to an embodiment of the present invention; FIG.
4 is a conceptual diagram provided for explanation of positional information correction of the noise source of the present invention
5 is a flowchart provided in the description of the camera position information generating method of the present invention, and
6 is a flowchart provided in an operation description of the CCTV system of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1 and FIG. 2, the security CCTV system 100 of the present invention can basically capture a surveillance area, and when an untoward situation occurs in the surveillance area, The situation can be photographed. The surveillance area is an area to be monitored by the CCTV system 100, such as a park or inside / outside of a building.

The CCTV system 100 includes a pan-tilt-zoom (PTZ) camera 110, a microphone 130, a sound source detector 150, and a controller 170.

2, the pan / tilt zoom camera 110, the microphone unit 130, and the sound source detection unit 150 are installed on a structure, usually a support column 10, installed on one side of the surveillance area. Further, it is preferable that the above-described structures are installed side by side on the horizontal support 11 installed on the upper end of the support 10, but they are not necessarily installed side by side on the horizontal support 11, It can be done. However, the present invention is not limited to the case where the pan tilt zoom camera 110 and the microphone unit 130 are spaced apart from each other, but the individual casings are not necessarily different from each other.

The pan / tilt zoom camera 110 includes a camera 111 capable of controlling a zoom to change a zoom and a pan / tilt controller 113 for panning / tilting the camera 111 Respectively. The operation of the pan / tilt zoom camera 110 is divided into a setting mode and a monitoring mode. In the setting mode, the operation for generating the position information of the pan / tilt zoom camera 110 is performed under the control of the control device 170. In the watching mode, according to the control of the controller 170, To perform the object action of.

On the other hand, the monitoring mode can be divided into the general-monitoring mode and the event-monitoring mode again. The general-surveillance mode is to shoot with a preset zoom value in a predetermined attitude, and the event-surveillance mode adjusts the focal distance and direction of the camera according to a PTZ parameter provided by the control device 170 . The photographed image is provided to the control center or the control device 170. Here, the PTZ parameter includes a pan-tilt-control value for controlling the pan / tilt controller and a zoom-control value for controlling the zoom Zomm.

The pan / tilt zoom camera 110 converts the photographed image into a digital signal and provides it to a control center or the like. The IP camera 100 is connected to a network camera 20 via an IP camera (IP) having a wired or wireless IP Lt; / RTI >

The sound source detection unit 150 can recognize the sound source using the microphone unit 130 and calculate the position information of the sound source in the three-dimensional space using the result of the sound source detection. In the setting mode, the position information of the pan / tilt zoom camera 110 based on the microphone 130 is calculated. In the monitoring mode, position information on the noise source based on the pan / tilt zoom camera 110 is generated.

The microphone unit 130 includes a plurality of microphones spaced apart from each other and collects the audio generated in the surroundings and converts the audio into an audio signal. The sound source detection unit 150 detects the audio signal based on the audio signal acquired by the microphone unit 130 , And 'location information'. In this case, the position information includes the distance to the corresponding sound source and the direction information based on the microphone 130 in the three-dimensional space.

Except for the correction process described below, the method of calculating the position information of the sound source detection unit 150 using the microphone unit 130 is the same in the setting mode and the gun monitoring mode. Hereinafter, mainly the monitoring mode will be mainly described, and the setting mode will be described separately.

The microphone 130 may be provided on one side of the pan tilt zoom camera 110 and may be installed side by side with the pan tilt zoom camera 110 on the horizontal support 11 on the upper side of the support 10 desirable.

3 (a) is a schematic view for explaining the arrangement of six microphones of the microphone unit 130, and FIG. 3 (b) is a perspective view of the microphone unit 130 according to an embodiment of the present invention. 3 (a), the microphone unit 130 includes four microphones 131, 133, 135, and 137 disposed at intervals of 90 degrees along the circumference of the imaginary circle 30 on the virtual plane, Detects the noise of the noise source. Here, it is preferable that the imaginary circle 30 is substantially parallel to the paper surface.

Even if the four microphones 131, 133, 135 and 137 of the microphone 130 sense the noise from the same noise source, the four microphones 131, 133, 135, An error occurs at the time of sensing. That is, a phase difference occurs between the audio signals provided by the four microphones 131, 133, 135, and 137 to the sound source detection unit 150. The sound source detection unit 150 can measure at least the distance of the noise source on the virtual plane and the plane distance to the noise source by the geometric calculation method based on the phase difference.

Further, the microphone unit 130 of the present invention may further include one, two or more microphones on a vertical line passing through the center point of the imaginary circle 30. 3, the microphones are further provided with two microphones 139 and 141 on the vertical line passing through the center point of the virtual circle 30 to have six microphones 131, 133, 135, 137, 139 and 141 from the same noise source And an example of detecting the transmitted noise is shown.

In this case, when the audio signal provided by the six microphones 131, 133, 135, 137, 139, and 141 is equal to or higher than a predetermined level as described above, the sound source detecting unit 150 detects the phase difference The direction and distance in the three-dimensional space of the noise source of the corresponding noise can be calculated. As described above, the position information of the noise source is still based on the position of the microphone unit 130. The direction and distance calculation of the sound source detection unit 150 can be performed by various methods known in the art, and the method disclosed in Korean Patent Laid-Open No. 10-2010-0121086 is an example thereof.

In the monitoring mode, the positional information calculated by the sound source detecting unit 150 is positional information on the noise source of the unidentified noise generated in the surveillance region. The sound source detection unit 150 may be configured to detect the sound source position using the 'camera position information' described below without providing the position information of the noise source calculated using the audio signal provided by the microphone unit 130 to the control unit 170 as it is And then provides it to the control device 170. Such a correction method will be described below again.

Referring to FIG. 3 (b), the microphone unit 130 and the sound source detection unit 150 of the present invention can be assembled into one component. Six microphones 131, 133, 135, 137, 139, and 141 are disposed below the sound source detection unit 150. A cover 143 for blocking noise from the upper side is disposed on the sound source detection unit 150 Lt; / RTI > The cover 143 also blocks other eyes, rain, and the like.

The sound source detecting unit 150 provides the controller 170 with position information on the three-dimensional space of the corrected noise source.

The sound source detection unit 150 and the control unit 170 are connected via the network 20. Here, the network 20 may be an IP (Internet Protocol) network or a mobile communication network capable of packet data communication. By using the network 20, the control device 170 can be placed in a control center elsewhere away from the monitoring space.

The controller 170 installed in the control center may be connected to a plurality of sound source detectors through the network 20 and may control the plurality of pan tilt zoom cameras 110 disposed in a plurality of monitoring areas. The control center monitors the images provided by the plurality of CCTV systems 100 and displays the images captured by the respective camera devices so that an administrator can monitor them.

In the case where the control device 170 is installed in the support 10, the sound source detection unit 150 may not be implemented as a separate device as described above, but may be a component built in the control device 170. [

The operation of the control device 170 is also divided into a setting mode and a monitoring mode. The controller 170 in the monitoring mode can control the pan / tilt zoom camera 110 to photograph the noise source using the location information of the noise source provided by the sound source detector 150. As a result, it is possible to record an unintentional situation that caused noise in the surveillance area. In addition, the control device 170 may receive and process an image (image) provided by the pan / tilt zoom camera 110.

In the setting mode, various setting values for controlling the CCTV system 100 of the present invention can be input, and more importantly, 'camera position information' described below can be generated.

For this operation, the controller 170 includes a camera angle control unit 171, a camera zoom control unit 173, and a camera position confirmation unit 175. When the control device 170 is disposed in an external control center, the sound source detecting unit 150 may have a network interface for connecting to the network 20. [

The camera angle control unit 171 controls the panning and zooming of the optical axis of the pan / tilt zoom camera 110 so as to face the noise source based on the position information ) Calculate angle and tilting angle. The camera angle control unit 171 calculates the pan tilt-control value according to the calculated panning angle and tilting angle and provides the calculated pan tilt-control value to the pan / tilt controller 113 of the pan / tilt zoom camera 110, So that the noise source is rotated by the panning angle and the tilting angle. The camera angle control unit 171 can calculate the pan tilt-control value using only the direction information among the position information provided by the sound source detection unit 150. [

The camera zoom control unit 173 calculates a zoom-control value for zoom control of the pan / tilt zoom camera 110 according to the position information of the noise source calculated by the sound source detection unit 150 and provides the zoom-control value to the pan / tilt zoom camera 110 . Accordingly, the camera 111 of the pan / tilt zoom camera 110 automatically adjusts the focal distance according to the zoom-control value to generate an enlarged image.

The zoom-control value calculation of the camera zoom control unit 173 may be performed using only the direction of the noise source without using the entire positional information of the noise source. Alternatively, the camera-zoom control unit 173 may use the tilting angle calculated by the camera angle control unit 171, .

For example, when the height of the noise source is limited to a certain range, such as the average key of a person, the direction information or the tilting angle of the noise source can be used. Since the installation height of the pan / tilt zoom camera 110 is fixed, the tilting angle by the geometric logic corresponds to the linear distance to the noise source of a constant height. Therefore, if the zoom-control value according to one tilting angle is arbitrarily set, the zoom-control value can be set proportionally to other tilting angles.

The camera position confirmation unit 175 controls the pan / tilt zoom camera 110 and the sound source detection unit 150 in [setting mode] to calculate and store 'camera position information'. The camera position information is information on the distance and direction to the pan / tilt zoom camera 110 with reference to the microphone unit 130.

Hereinafter, a method of calculating camera position information will be described with reference to FIG.

<Camera position information>

FIG. 4 shows an azimuth coordinate system centering on the microphone unit 130. As shown in FIG. The position information of the noise source X detected by the sound source detection unit 150 using the audio signal provided by the microphone unit 130 during the monitoring mode is based on the microphone unit 130. For example, And corresponds to the one-directional vector D1. However, in practice, when the pan tilt zoom camera 110 photographs the noise source X, it should be the second direction vector D2. Here, the camera position information is also based on the microphone 130 and corresponds to the third direction vector D3, and the reference direction vector Dc represents the reference posture of the pan / tilt zoom camera 110

Therefore, when the camera angle control unit 171 rotates the pan / tilt zoom camera 110 based on the first direction vector D1, the pan / tilt zoom camera 110 is directed in a totally different direction than the noise source X. In order to solve this problem, the sound source detecting unit 150 detects the position information (first direction vector, D1) of the noise source calculated using the microphone unit 130 as position information based on the pan / tilt zoom camera 110 2 direction vector, D2). The camera position information (third direction vector, D3) detected in the setting mode is used for this correction. The sound source detection unit 150 provides the corrected position information to the camera angle control unit 171. The camera angle control unit 171 performs panning based on the position information of the corrected noise source X, Calculate angle and tilting angle. Since the position information of the corrected noise source is based on the pan / tilt zoom camera 110, the pan / tilt zoom camera 110 can accurately direct the noise source X.

The method of calculating the second direction vector D2 by using the first direction vector D1 and the third direction vector D3 can use a method known in the prior art as it is.

Various methods can be used to calculate camera position information. The calculation process may be omitted by installing the microphone unit 130 and the pan / tilt zoom camera 110 only at predetermined positions. However, the circumstances of the installation site may be changed at any time, so that it may not be possible to place it in a fixed position according to the site conditions. Therefore, it is desirable to recalculate the camera position information according to the field installation. The present invention solves this problem by suggesting a method of automatically calculating the camera position information using the microphone 130 and the sound source detector 150. [

Hereinafter, with reference to FIG. 5, a method of generating camera position information centering on the operation of the camera position confirming unit 175 will be described.

&Lt; Calculation of camera position information: Fig. 5 &

The method of calculating camera position information proposed by the present invention is sound source recognition. The sound source detection unit 150 recognizes the detection-audio output from the pan / tilt zoom camera 110 by using the microphone unit 130 in the same manner as that of calculating the position information of the noise source, To calculate camera position information. The calculation of the camera position information is controlled by the camera position confirming unit 175 and is performed in the setting mode.

For detection of the pan / tilt zoom camera - Audio output (S501)

When entering the setting mode, the camera position confirmation unit 175 first controls the pan / tilt zoom camera 110 to output predetermined 'audio for detection'. It is desirable that the detection-audio at this time be set so that the sound source detector 150 can be distinguished from other noises, so that it is preferable that the detection-audio has some regularity.

In order to output audio for detection, the pan / tilt zoom camera 110 may further include a separate audio output unit (not shown). In this case, the audio output unit (not shown) may include audio processing means and a speaker, and output audio for detection. Particularly, it is preferable that the audio output unit outputs the audio of the non-audible frequency band that can not be output by a person or animal to the audio detection unit 150 so that the audio detection unit 150 can easily distinguish the detection audio from the other noise.

In another embodiment, the camera position determining unit 175 may control the pan / tilt zoom camera 110 to perform predetermined pivoting operations (panning and / or tilting). Since the pan / tilt zoom camera 110 makes some noise during the panning and tilting operations, this noise is used as audio for detection. In other words, the camera position confirmation unit 175 can cause the pan / tilt zoom camera 110 to output detection-audio by performing a predetermined rotation operation (panning and / or tilting).

It is preferable that the operation of the pan / tilt zoom camera 110 at this time has the above-mentioned somewhat regularity so that the sound source detection unit 150 can recognize the regularity. For example, the following pattern rotation can be repeated a plurality of times at a constant interval.

[Panning (3 sec) - Stop (1 sec) - Panning (3 sec) - Stop (1 sec) - Panning (3 sec) - Stop

It is preferable that the camera position confirming unit 175 repeats this operation of the pan / tilt zoom camera 110 a plurality of times until it is notified from the sound source detecting unit 150 that it has recognized the preset detection audio.

Although other noise may exist in the area where the pan / tilt zoom camera 110 is installed, the sound source detecting unit 150 recognizes the audio for detection because it is performed in the setting mode under the control of the camera position confirming unit 175 The probability is very high. Furthermore, there is an advantage that the pan / tilt zoom camera 110 does not need to have a separate audio output unit for outputting detection-audio.

The position information of the pan / tilt zoom camera is generated (S503, S505)

The camera position confirmation unit 175 controls the pan / tilt zoom camera 110 to output detection-audio, and at the same time, causes the sound source detection unit 150 to recognize the detection- As shown in FIG.

Accordingly, the sound source detection unit 150 collects ambient noise using the microphone unit 130, and then recognizes predetermined detection-audio among the collected noise (S503). The sound source detection unit 150 calculates the position of the PTZ camera 110, that is, the camera position information, using the detection-audio method (S505).

Camera position information is generated in the above manner. After step S505, the pan / tilt zoom camera 110 returns to the basic posture, and the sound source detector 150 stores the calculated camera position information by performing step S505.

Hereinafter, the operation of the security CCTV system 100 of the present invention will be described with reference to FIG.

Setting of camera position information (S601)

In the setting mode, the camera position confirming unit 175 controls the pan / tilt zoom camera 110 to output detection-audio, and controls the sound source detecting unit 150 to calculate the camera position information. The method of calculating the camera position information is performed by the method of FIG. 5 described above. In the example of FIG. 4, the camera position information calculated by the sound source detection unit 150 corresponds to the third direction vector D3.

General-monitoring mode (S603, S605)

When the surveillance mode is entered, the pan / tilt zoom camera 110 is in the normal-surveillance mode, in which the surveillance area is photographed with a predetermined 'default attitude'. The basic posture refers to a direction and a zoom value set for photographing by the pan / tilt zoom camera 110 when there is no other event (S603).

The microphone unit 130 senses the noise generated in the surveillance region and provides the sound to the sound source detection unit 150. The sound source detection unit 150 continuously monitors whether a noise above a predetermined level is detected. In FIG. 4, the reference posture is represented by a reference direction vector Dc (S605).

Event generation according to noise detection (S607)

The sound source detection unit 150 proceeds to the event-monitoring mode when it detects noise above a predetermined level. In the event-monitoring mode, the sound source detection unit 150 calculates the direction of the noise source of noise using the audio signals provided by the six microphones 131, 133, 135, 137, 139, and 141 of the microphone unit 130 . In the example of FIG. 4, the position information of the noise source calculated by the sound source detection unit 150 corresponds to the first direction vector D1.

The noise source position information is corrected (S609)

The sound source detection unit 150 corrects the position information of the noise source calculated in step S505 as the position information of the noise source based on the pan / tilt zoom camera 110 using the camera position information. As described above with reference to FIG. 4, the sound source detecting unit 150 detects the noise source position information obtained by the first direction vector D1 as the second direction vector D2 (D2) using the camera position information set as the third direction vector D3 As shown in FIG.

The PTZ parameter calculation (S611 to S617) in accordance with the corrected noise source position information

The camera angle control unit 171 and the camera zoom control unit 173 receive the position information of the noise source from the sound source detection unit 150 in step S611 and calculate the panning angle, tilting angle, and zoom value in step S613. Then, the camera angle control unit 171 provides a pan tilt-control value based on the calculated panning angle and tilting angle to the pan / tilt controller 113, and the camera zoom control unit 173 controls the zoom-control based on the calculated zoom value To the camera 111 (S615, S617).

Shooting according to the event-monitoring mode (S619, S621)

The pan / tilt controller 113 of the pan / tilt zoom camera 110 rotates the camera 111 according to the pan / tilt-control value, and the camera 111 controls the zoom according to the zoom- do.

The pan / tilt zoom camera 110 provides the photographed image to the control center. The controller 170 may provide an image when the controller 170 includes a separate image processing unit or an image storage medium.

The above-described CCTV system 100 of the present invention not only provides an image of a whole surveillance area like a conventional closed circuit system, but also tracks the location of a noise source generated in the surveillance area, It is possible to provide a more detailed and more favorable image. Accordingly, when noise above a predetermined level is generated in the space, it is possible to provide an image related to the noise to the control center, and in the case of detecting such noise, a separate alarm message can be directly transmitted to the control center.

&Lt;Examples; Disable event - watch mode>

The control device 170 may further include an image processing unit 177 that can receive various images captured by the pan / tilt zoom camera 110 and perform various image processes. Here, the image processing corresponds to object recognition, car number recognition, face recognition, and the like, and conventionally known methods can be used for such an image processing method.

In particular, the image processing unit 177 performs image processing on an image provided after the pan / tilt zoom camera 110 rotates according to the pan / tilt-control value provided from the camera angle control unit 171, It is possible to determine whether there is any moving object in the center of the object.

If there is no moving object in the center of the image, it is determined that the event is not caused by a true noise source, and the event-monitoring mode is canceled. Accordingly, the pan / tilt zoom camera 110 can return to the normal-surveillance mode in step S603 and photograph the surveillance area in the basic posture.

In addition, the event-monitoring mode can be used when (1) the predetermined time period has elapsed since the start of the event-monitoring mode, (2) when an event by another noise source occurred, (3) Or the like can be released.

&Lt; Example: Confirmation of camera position information >

When the controller 170 includes the image processor 177, the camera position check unit 175 can check whether the camera position information detected by the sound source detector 150 is correct using the image processor 177.

The sound source detection unit 150 provides the camera position information to the camera angle control unit 171 of the control device 170 after performing step S505 and the camera angle control unit 171 uses the camera position information And controls the pan / tilt zoom camera 110 positioned to face the microphone unit 130.

After that, the image processor 177 determines whether the microphone 130 is positioned at the center of the image provided by the pan / tilt zoom camera 110, and provides the determination result to the camera position confirmation unit 175. For example, an identifier for position confirmation may be displayed on one side of a plurality of microphones of the microphone unit 130, and the image processing unit 177 may recognize the identifier at the center of the image. If the identifier is recognized, the camera position confirmation unit 175 finishes setting the camera position information.

When the identifier is recognized outside the center of the image, the camera position check unit 175 rotates the pan / tilt zoom camera 110 based on the position of the identifier to adjust the identifier to be located at the center of the image. If the identifier is not recognized in the image, the camera position confirmation unit 175 repeats the process of FIG.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

Claims (10)

In a security CCTV system,
A pan / tilt zoom camera that captures a surveillance area and outputs predetermined detection-audio;
An audio signal obtained using a plurality of microphones is processed to calculate the position information of the surrounding noise source in the microphone reference and then corrected to the position information of the noise source in the camera reference using the preset camera position information A sound source detection unit;
A camera angle controller for controlling the camera to photograph the noise source by rotating the camera based on the corrected position information provided by the sound source detector; And
And controls the sound source detecting unit to detect the audio for detection and calculate the camera position information, which is the position of the camera in the microphone reference, by controlling the camera to output the predetermined detection-use audio in the setting mode, And a camera position confirming unit for confirming the position of the camera.
The method according to claim 1,
Wherein the camera position confirming unit controls the camera to generate a noise corresponding to the detection-audio in the rotation process by rotating the camera in a predetermined pattern.
3. The method of claim 2,
Wherein the camera position confirming unit repeats the rotation of the pattern a plurality of times until receiving the detection completion notification from the sound source detecting unit.
The method according to claim 1,
Wherein the pan / tilt zoom camera has a separate audio output unit for outputting the audio for detection belonging to the non-audible frequency band.
The method according to claim 2 or 4,
Further comprising an image processor capable of recognizing an identifier displayed on one side of the plurality of microphones from an image provided by the camera,
In the setting mode, the camera position check unit controls the camera to photograph the microphone using the camera position information calculated by the sound source detecting unit, and when the image processor recognizes the identifier at the center of the image photographed by the microphone The controller determines that the calculation of the camera position information is completed.
A method for monitoring a security CCTV system,
A first step in which the pan / tilt zoom camera photographs the surveillance area in a predetermined basic attitude;
A second step of calculating position information of a surrounding noise source based on the position of the microphone based on the audio signal obtained by the sound source detection unit using a plurality of microphones;
A third step of the sound source detection unit correcting the position information of the noise source to position information based on predetermined camera position information; And
And a fourth step of controlling the camera angle control unit to photograph the noise source by rotating the camera based on the corrected position information provided by the sound source detection unit,
The second step comprises:
Outputting a predetermined detection-audio to the camera during the camera positioning confirmation setting mode; And
Wherein the sound source detection unit recognizes the detection-audio and calculates the camera position information.
The method according to claim 6,
Wherein the camera position check unit controls the camera to generate a noise corresponding to the detection-audio in the rotation process by rotating the camera in a predetermined pattern in the step of outputting the detection-audio, Of monitoring.
8. The method of claim 7,
Wherein the camera position confirming unit repeats the rotation of the pattern a plurality of times until receiving the detection completion notification from the sound source detecting unit.
The method according to claim 6,
Wherein the audio output unit mounted on the pan / tilt zoom camera outputs a specific audio signal in the non-audible frequency band as the audio for detection in the step of outputting the audio for detection.
10. The method according to claim 7 or 9,
The second step comprises:
Controlling the camera position confirming unit to photograph the microphone by using the camera position information calculated by the sound source detecting unit; And
Further comprising the step of determining that the calculation of the camera position information is completed when the image processing unit recognizes the identifier displayed on one side of the plurality of microphones at the center of the image taken by the microphone, Of monitoring.

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