KR101268076B1 - Closed circuit television system and method of object tracking - Google Patents

Abstract

The present invention relates to a surveillance camera system and a position estimation method using the same according to the detection direction of the sound generation, two microphones are provided in the base plate at a predetermined interval and the receiver is installed at the upper predetermined position of the camera, and connected to the receiver A calculator for calculating the direction of the sound source using the data received from the microphone, a driver for receiving the control signal output from the calculator and rotating the camera in the direction of the sound source, and a camera rotated in the direction of the sound source by the driver And an output unit for outputting a video signal photographed by the.

Description

Surveillance camera system and location estimation method using sound detection direction {CLOSED CIRCUIT TELEVISION SYSTEM AND METHOD OF OBJECT TRACKING}

The present invention relates to a surveillance camera system according to the sound generation direction detection method and a location estimation method using the same, more specifically, to detect the sound in a building, such as security or crime prevention to detect the up, down, left, right direction of the camera The present invention relates to a surveillance camera system according to a sound generation direction detection capable of controlling or estimating the position of sound generation and a location estimation method using the same.

In general, in the places where security monitoring is required, such as financial institutions, department stores, discount stores, construction sites, apartments, etc., various sensors are installed to report abnormal movements or sounds to abnormal managers, or security monitoring. The company has established a series of security surveillance systems that allow users to monitor camera images through monitor screens while installing and managing cameras to store the camera images in a separate database.

However, in the case of security monitoring using a detection sensor, the range of detection is extremely limited due to the characteristics of the sensor. Especially, in the case of an administrator who has been reported that strange movements or sounds have been detected, the movements or sounds are invaded by outsiders. Since it is not possible to know exactly whether it is caused by a dog or a cat, a pigeon or the like, there was an inconvenience of having to check the vicinity of the place where the corresponding sensor is installed.

In addition, in the case of security surveillance using a camera, there is an advantage that a camera can be monitored through a monitor screen at a remote location by installing a security surveillance camera in a path or a location where an outsider is expected to invade. Since the camera also has a limited shooting angle, there may be a blind spot where security monitoring is impossible even if multiple cameras are installed.To compensate for this, additional security surveillance cameras capable of shooting blind spots need to be installed. There was a problem that accompanied the cost of camera purchase and system installation.

In addition, recently installed a security surveillance camera that can be rotated by a certain angle in the vertical, horizontal direction for security surveillance in the blind area where security surveillance is not possible, and by rotating the camera by a certain angle manually or automatically by the administrator. Security surveillance is to be provided. In this case, when the camera is rotated by the administrator's manual operation, it is inconvenient for the administrator to directly intervene in the security surveillance, unlike the original purpose of the security surveillance system built for unmanned surveillance. In addition, when the camera is automatically rotated, power consumption is increased due to continuous camera rotation, and the operating cost of the system increases, and there is a problem that there may be a blind spot where security monitoring is impossible at some point.

Therefore, the present invention is to solve the above-described problems, and after detecting the sound generated in the left, right direction and the up, down direction relative to the camera, the position of the sound source can be estimated through the camera to a small number The purpose of the present invention is to provide a surveillance camera system according to sound generation direction detection and location estimation method using the same, which can minimize blind spots of security surveillance with a camera and can implement and operate a more efficient surveillance camera system at a low cost. .

According to a preferred embodiment of the present invention, two microphones are provided on the base plate at regular intervals, and the receiver is installed at a predetermined position on the top of the camera, and the position of the sound source is connected to the receiver by using the data received from the microphone. A calculating unit, a driving unit which receives the control signal output from the calculating unit, and rotates the camera to the position of the sound source, and an output unit which outputs the image signal photographed by the camera rotated to the position of the sound source by the driving unit. Provided is a surveillance camera system according to a sound generating direction detection, characterized in that made.

The receiving unit is characterized in that the three microphones are provided on the base plate at regular intervals and installed in the upper predetermined position of the camera.

Comparing the sound pressure of the sound source received from the microphone, it characterized in that the direction of the camera is switched in the direction in which the largest sound pressure is generated.

In addition, the position estimation method according to the sound generating position detection in accordance with the present invention comprises the steps of collecting data from the receiver, filtering the data collected from the receiver, cross-correlation using the time difference of the filtered data Obtaining a step, defining a hyperbolic equation using the time difference, setting a location of a sound source using the defined hyperbolic equation, and displaying a location of the set sound source on a display device. It features.

After setting the position of the sound source, characterized in that it further comprises the step of shooting and recording the position with a camera.

According to the surveillance camera system according to the sound generation direction detection and position estimation method using the same according to an embodiment of the present invention, after detecting the sound generated in the left, right direction and up, down direction based on the camera, The location of the sound source can be estimated through this, so that the blind spots of security surveillance can be minimized with a few cameras, and a more efficient surveillance camera system can be implemented and operated at a low cost.

1 is a view showing a schematic configuration of a surveillance camera system according to the sound generation direction detection according to an embodiment of the present invention.
Figure 2 is a perspective view of the surveillance camera according to the sound generating direction detection using the microphone and the camera according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a step of estimating a direction of a sound source according to sound generation direction detection according to an embodiment of the present invention, and zooming in and capturing and recording a camera to an estimated position.
4 is a view showing a position estimation method according to the sound generation direction detection according to an embodiment of the present invention.
5 is a graph showing the direction of sound generation when three microphones are placed vertically;
6 is a graph showing the direction of sound generation when three microphones are placed horizontally.
Fig. 7 is a graph showing the direction of sound generation when two microphones are used.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a view showing a schematic configuration of a surveillance camera system according to the sound generation direction detection according to an embodiment of the present invention, Figure 2 is a sound generation direction detection using a microphone and a camera according to an embodiment of the present invention A perspective view of a surveillance camera.

1 to 2, the surveillance camera system according to the sound generating direction detection according to an embodiment of the present invention includes a receiver 100, a calculator 110, a driver 120, an output unit 130. Is done.

The receiver 100 is provided with three microphones 10a, 102b, and 102c at both ends and the center of the base plate 104, respectively, and are installed at predetermined positions of the camera 106.

Here, the microphone (microphone) is also called a microphone (mike, mic), a device for converting the sound into an electrical signal by transmitting the audible sound to an electrical energy converter or sensor.

In addition, two microphones may be provided, one at each end of the base plate, as necessary.

The calculating unit 110 calculates the position of the sound source using the data received from the microphones 102a, 102b, 102c.

The driver 120 receives the control signal output from the calculator 110 and rotates the camera 106 in the direction of the sound source where the sound is generated.

At this time, the camera is redirected toward the sound source in which the sound pressure is greatest among the sound sources collected from each of the microphones 102a, 102b, and 102c.

The output unit 130 outputs an image signal photographed by the camera 106 rotated to the position of the sound source by the driver 120.

FIG. 3 is a block diagram illustrating a step of estimating a direction of a sound source according to a sound generation position detection and zooming in and capturing and recording a camera to an estimated position according to an embodiment of the present invention.

Referring to FIG. 3, the method of estimating, photographing, and recording a sound source according to a sound generation direction according to an embodiment of the present invention includes receiving a sound source from the receiver 100 (S10) and the receiver 100. Measuring the sound pressure of the sound source received from each microphone of (S20), comparing the sound pressure of the measured sound source with the sound pressure of the set minimum sound source (S30), and the sound pressure of the minimum sound source for which the measured sound pressure of the sound source is set If exceeding, the step of estimating the direction of the sound source (S40), the step of rotating the camera in the direction of the estimated sound source (S50), and the step of shooting and recording the direction of the estimated sound source (S60).

4 is a view showing a position estimation method according to the sound generation direction detection according to an embodiment of the present invention.

Referring to FIG. 4, according to an embodiment of the present disclosure, a method of estimating a sound generation direction according to an embodiment of the present disclosure includes collecting data from the receiver 100 (S100) and filtering data collected from the receiver 100. (S200), obtaining a time difference of the filtered data (S300), defining a hyperbolic equation using the time difference (S400), and setting a position of the sound source using the defined hyperbolic equation ( S500) and displaying the position of the set sound source on the display device (S600).

Collecting data from the receiver 100 (S100) is to receive an electrical signal from the microphone (102a, 102b, 102c), filtering the data collected from the receiver 100 (S200) is noise in the collected data As a step of removing the data, the data below the set minimum sound pressure is removed.

)을 비교함으로써 수학식 1과 같이 구할 수 있다.In the step (S300) of obtaining the time difference of the filtered data, various known methods may be used. However, in the present invention, the arrival time between the electrical signals using cross-correlation (

) Can be obtained as in Equation 1.

Defining the hyperbolic equation using the time difference (S400) is to calculate the trace or asymptote of the hyperbola where the sound source can be located from the time difference, to obtain the distance difference (time difference * sound velocity, K) from the time difference, two microphone popphone From the distance between the center and the center (focal length in hyperbolic, c) and the distance difference (K), the equation of the hyperbola is obtained as in Equation 2.

From the hyperbolic equation obtained as described above, the asymptotic equation is obtained as in Equation 3 below.

Here, the step of setting the position of the sound source (S500) is determined by the slope and the yin and yang of the graph close to the position of any one of the two microphones. However, when using the asymptotic equation using three microphones, the actual sound source is found using the two asymptotic intersections.

Here, when the position of the sound source is set, the method further includes the step of photographing and recording by rotating the camera to the position of the set sound source (S500 ').

Referring to FIG. 5, when the position of the sound source is measured while the three microphones are placed in the vertical direction, a curve S1 is drawn between the microphone 102a and the microphone 102b, and the microphone 102b and the microphone 102c. Curve S2 is drawn between), and the position of the sound source becomes the X point which is the intersection point of both curves.

Referring to FIG. 6, when the position of the sound source is measured while three microphones are placed horizontally, a curve S1 close to the microphone 102b is drawn between the microphone 102a and the microphone 102b, and the microphone 102b is illustrated. Between the microphone 102c and the curve 102 is drawn close to the microphone 102b. Here, the position of the sound source will be either X1 or X2.

6 to 7, in the case of two microphones 102a and 102b, the left and right directions of the sound source may be estimated on a plane in which the sound source and the microphone are installed, and the number of the microphones is three 102a. , 102b and 102c, the left and right directions can be seen from the plane where the microphones 102a and 102b are installed, and the left and right directions can be seen from the plane where the microphones 102b and 102c or 102a and 102c are installed. That is, when the microphones 102a, 102b, 102c and the sound source are on one plane, the position of the sound source can be estimated, and when the microphones 102a, 102b are installed on the horizontal axis and the microphones 102b, 102c are installed on the vertical axis ( The left and right directions from 102a and 102c can be estimated simultaneously from the 102b and 102c directions.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention It can be understood that it is possible.

100:
102a, 102b, 102c: microphone
104: base plate
106: camera
110: calculator
120:
130:

Claims (5)

Two microphones are provided on the base plate at regular intervals, the receiving unit is installed in the upper predetermined position of the camera;
A calculating unit connected to the receiving unit to calculate a direction of a sound source using data received from the microphone;
A driving unit which receives the control signal output from the calculating unit and rotates the camera in the direction of a sound source;
And an output unit for outputting an image signal photographed by the camera rotated in the direction of the sound source by the driving unit,
Surveillance camera system according to the sound generating direction detection, characterized in that the direction of the camera is switched to the direction in which the largest sound pressure is generated by comparing the sound pressure of the sound source received from the microphone.
The method according to claim 1, The receiving unit,
Surveillance camera system according to the sound generating direction detection, characterized in that the three microphones are provided in the base plate at a predetermined interval at the upper predetermined position of the camera.
delete Collecting data from the receiver;
Filtering data collected from the receiving unit;
Obtaining a time difference of the filtered data using cross correlation;
Defining a hyperbolic equation using the time difference;
Setting a position of a sound source using the hyperbolic equation defined above; And
And displaying the position of the set sound source on a display device.
After setting the position of the sound source, the position estimation method according to the sound generation direction detection characterized in that it further comprises the step of shooting and recording the position with a camera. delete

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