KR101733305B1 - Smart alarm broadcasting apparatus - Google Patents

Smart alarm broadcasting apparatus Download PDF

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Publication number
KR101733305B1
KR101733305B1 KR1020150148345A KR20150148345A KR101733305B1 KR 101733305 B1 KR101733305 B1 KR 101733305B1 KR 1020150148345 A KR1020150148345 A KR 1020150148345A KR 20150148345 A KR20150148345 A KR 20150148345A KR 101733305 B1 KR101733305 B1 KR 101733305B1
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KR
South Korea
Prior art keywords
alarm
signal
rate
change
image
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KR1020150148345A
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Korean (ko)
Inventor
김종환
임영호
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(주) 케이엠미디어
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/14—Central alarm receiver or annunciator arrangements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19602—Image analysis to detect motion of the intruder, e.g. by frame subtraction
    • G08B13/19613—Recognition of a predetermined image pattern or behaviour pattern indicating theft or intrusion
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19665—Details related to the storage of video surveillance data
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B27/00—Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations
    • G08B27/001—Signalling to an emergency team, e.g. firemen
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

Abstract

The present invention relates to a smart alarm apparatus for monitoring a situation of a monitored area and automatically broadcasting an alarm in accordance with a monitoring result, the smart alarm apparatus comprising: image acquiring means for photographing a surveillance target area and storing the photographed image as a digital image signal; An image comparing means for receiving a video signal from the image acquiring means, dividing the image signal by frame, comparing two adjacent frames on a pixel basis to calculate a rate of change of a video signal, A sound comparison means for calculating a rate of change of the sound signal by receiving the sound signal from the sound acquiring means; and a comparison means for comparing the rate of change of the image signal and the sound acquisition And a control unit for controlling the rate of change of the video signal and the variation of the sound signal And an alarm broadcasting means for receiving an instruction regarding the occurrence of an alarm from the situation determination means and broadcasting an alarm when the sum of the rates is greater than a preset reference value , It is possible to monitor precisely for a specific situation, and it is possible to perform various warning broadcasts according to the monitoring result.

Description

[0001] Smart alarm broadcasting apparatus [0002]

The present invention relates to an alarm broadcasting apparatus, and more particularly, to a smart alarm broadcasting apparatus capable of automatically monitoring various situations by monitoring surrounding conditions.

Conventional alarm broadcasting devices monitor the manager for a specific situation such as an emergency situation, and alert the person directly when a specific situation occurs. However, such conventional alarm broadcasting apparatuses are inefficient due to a large amount of money or manpower, and thus, many devices for monitoring specific situations in real time and automatically executing alarm broadcasting have been developed.

Korean Patent Registration No. 10-1271768 (Patent Document 1) discloses an automatic alarm broadcasting apparatus that adopts a configuration including bi-directional communication between an event monitoring apparatus and a central management apparatus via a VoIP network including a VoIP module, A VoIP-based event status central management device and an event management system capable of broadcasting an alert message corresponding to the event situation by including a warning message storage module for storing a plurality of alert messages classified according to the situation .

According to Korean Patent Registration No. 20-0340197 (Patent Document 2), as an example of another automatic alarm device, a water level detecting means is installed at a necessary place to automatically detect an increase in water level, and a detection signal And automatically broadcasts a warning in accordance with the instruction of the user.

However, the above-mentioned alarm broadcasting apparatuses have a simple and limited monitoring means for a specific situation, so it is difficult to monitor complicated situations. In addition, when an emergency occurs, only a single alarm is generated, and various warning broadcasts can not be automatically performed in accordance with various emergency situations.

Therefore, there is a need to develop an automatic alarm broadcasting apparatus that can solve these problems and operate more smarter.

Korean Patent Registration No. 10-1271768 Korean Registration Practical Bulletin No. 20-0340197

An object of the present invention is to improve the performance of the above-mentioned conventional alarm broadcasting apparatus, and it is an object of the present invention to provide an alarm broadcasting apparatus which can precisely monitor a specific situation, And to provide an alarm broadcasting apparatus.

According to an aspect of the present invention, there is provided an alarm broadcasting apparatus comprising: image capturing means for capturing an area to be monitored and storing a captured image as a digital image signal; Image comparing means for receiving a video signal from the image acquiring means, dividing the image signal into frames, comparing two adjacent frames on a pixel-by-pixel basis, and calculating a rate of change of the video signal; Sound acquisition means for sensing sound generated in the monitored area and storing the sensed sound as a digital sound signal; Sound comparing means for receiving a sound signal from the sound acquiring means and calculating a rate of change of the sound signal; And an emergency state in which an alarm is to be generated when the sum of the rate of change of the video signal and the rate of change of the sound signal is greater than a predetermined reference value in response to the change rate of the video signal and the sound signal from the sound acquiring means, Condition determining means for determining whether or not the vehicle is running; And an alarm broadcasting means for receiving an instruction regarding the occurrence of an alarm from the situation determination means and broadcasting an alarm, wherein the situation determination means receives the video signal obtained when the monitored area is in a normal situation, A rate of change of the video signal is obtained by comparing each of two frames adjacent to each other on a pixel basis to obtain a rate of change of the video signal by receiving the acoustic signal obtained when the monitored area is in a normal state, The reference value is set based on the sum of the average values of the rate of change of the sound signal.

It is preferable that the image comparing means calculates the number of pixels changed between two adjacent frames and calculates a rate of change of the number of changed pixels as a rate of change of the video signal.

Preferably, the image comparing means may calculate the rate of change of the image signal by removing the color information from the image signal from the image acquiring means, changing the image into a monochrome image, and comparing the color information with each other in units of two adjacent frames.

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The situation determination means may send the difference value between the sum of the rate of change of the video signal and the rate of change of the sound signal and the reference value to the alert broadcasting means together with an instruction regarding the alert generation, It is possible to broadcast the alarm by adjusting the volume of the alert broadcast according to the magnitude of the difference value.

The situation determination means may send the difference value between the sum of the rate of change of the video signal and the rate of change of the sound signal and the reference value to the alert broadcasting means together with an instruction regarding the alert generation, A speaker to broadcast an alarm according to the magnitude of the difference value, and broadcast an alarm through the selected speaker.

The alarm broadcast unit may include an audio signal generator for generating an audio signal; An audio mixer for processing and outputting the audio signal generated by the audio signal generator; A volume controller for controlling the audio mixer according to the magnitude of the difference value to adjust the size of the audio signal; A power amplifier for amplifying an audio signal output through the audio mixer; And a speaker for transmitting the amplified signal from the power amplifying unit.

Alternatively, the alarm broadcast unit may include an audio signal generator for generating an audio signal; An audio mixer for processing and outputting the audio signal generated by the audio signal generator; A power amplifier for amplifying an audio signal output through the audio mixer; A plurality of speakers for transmitting the amplified signals from the power amplifier; And a speaker selection unit for selecting a speaker to broadcast an alarm according to the magnitude of the difference value.

According to the smart alarm broadcasting apparatus of the present invention, the following effects can be expected.

First, by judging the surveillance situation based on the rate of change of images between adjacent frames, it is possible to quickly and accurately determine the situation only by simple calculation, and when surveillance area images such as a prison or a school show a stereotyped characteristic, Lt; RTI ID = 0.0 >

Second, by using both the image change rate and the sound change rate for the surveillance situation judgment, more accurate situation judgment is possible.

Third, it is possible to reduce a judgment error on an emergency situation by setting a reference value serving as a standard of the situation judgment based on the image change rate and / or the sound change rate of the normal situation and using the reference value changing with time.

Fourth, since the volume of the alert broadcast can be adjusted by broadcasting based on the rate of change of image or the rate of change of sound acquired from the monitored area, the alert broadcast can be transmitted according to the danger of the surveillance situation or degree of urgency.

Fifth, it is possible to select and broadcast a speaker to broadcast an alarm on the basis of the image change rate or the sound change rate obtained from the monitored area, so that the alarm broadcast can be transmitted by limiting the area or person requiring the alarm broadcast.

1 schematically shows a configuration of a smart alarm device according to a first embodiment of the present invention.
FIG. 2 shows an adjacent image frame for explaining the operation of the image comparing means in the smart alarm apparatus according to the first embodiment of the present invention.
3 shows an example of an alarm broadcasting means in the smart alarm device according to the first embodiment of the present invention.
FIG. 4 shows a modification of the alarm broadcasting means in the smart alarm apparatus according to the first embodiment of the present invention.
5 schematically shows a configuration of a smart alarm device according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

≪ Embodiment 1 >

The smart alarm apparatus according to the first embodiment of the present invention monitors a situation of a monitored area and automatically broadcasts an alarm according to a monitoring result, and the schematic configuration is shown in a block diagram in FIG.

As shown in FIG. 1, the smart alarm apparatus of the present invention may include an image acquiring means 100, an image comparing means 200, a situation determining means 300, and an alarm broadcasting means 400.

First, the image acquiring unit 100 captures an area to be monitored, stores the captured image as a digital signal to acquire an image signal, and sends the acquired image signal to the image comparing unit 200. The image acquiring unit 100 may include a camera that captures an area to be monitored and a storage unit that stores captured image signals as digital signals.

Next, the image comparing means 200 receives the image signal sent from the image obtaining means 100, divides the image signal by frame, compares two adjacent frames on a pixel-by-pixel basis, and calculates a rate of change of the image signal. The comparison of two adjacent frames is continuously performed on the entire video signal.

Further, the situation determining means 300 receives the rate of change of the video signal from the video comparing means 200, and determines that the situation is an emergency situation in which an alarm should be generated if the rate of change of the video signal is larger than a preset reference value.

The image comparing means 200 and the situation determining means 300 may be realized by a microcontroller or a computer system.

The rate of change of the video signal calculated by the video comparing means 200 is proportional to the motion of the object in the video signal. That is, the large rate of change of the video signal means that the change of the video signal between the adjacent frames is large, which means that the motion of the object in the video is large during the specific period. It is highly likely that an abnormal situation occurred in the monitored area because the motion of the object rapidly increases in the image of the monitored area. Therefore, it is determined that the monitored area is in an emergency situation by comparing the rate of change of the video signal with an appropriate reference value can do.

In this embodiment, the number of pixels changed between two adjacent frames is calculated, and the rate of change of the number of changed pixels is calculated as the rate of change of the video signal do. This calculation method can produce quick and accurate results.

Further, in order to reduce the amount of calculation, the color image may be converted into a monochrome image, and then the rate of change of the image signal may be calculated. That is, it is also possible to calculate the rate of change of the video signal by removing the color information from the video signal photographed at the monitoring target area, changing the black and white image, and comparing the color information with each other for each two frames adjacent to each other. FIG. 2 shows an example of comparing frames of an adjacent image.

The rate of change of the video signal calculated as described above is compared with a preset reference value in the situation determination means 300. [ That is, if the rate of change of the video signal is larger than the reference value, it is determined that the movement of the object is abnormally increased in the surveillance target area, and therefore, it is judged to be an emergency situation. For example, when the rate of change of the video signal according to the time t is v (t) and the reference value of the video signal according to the time t is v ref (t) Emergency situation is judged.

v (t) > vref (t) ..... (1)

The reference value v ref (t) of the video signal can be determined by various methods. In this embodiment, the video signal obtained when the monitored region is in a normal state is received, from frame to frame compared to the pixels to obtain the rate of change of the video signal, on the basis of the mean value (v m (t)) of the rate of change of the image signal and sets a reference value of the video signal (v ref (t)). The period for calculating the average value (v m (t)) is set according to the characteristics of the area to be monitored, and in the case of a prison, it is preferable to calculate the average value at a cycle of one day or one week.

Simply the mean value (v m (t)) also set to the same value and the reference value (v ref (t)) of the video signal, but (i.e., v ref (t) = v m (t)), of a real emergency situation It is preferable to set a reference value by adding a certain value to the average value based on the difference between the rate of change of the image signal obtained from the image and the average value. For example, if the predetermined value is k, the reference value v ref (t) of the video signal can be set as follows.

v ref (t) = vm (t) + k (2)

By appropriately setting the magnitude of the constant value k, the frequency of occurrence of the alarm can be adjusted.

As described above, by setting the reference value, which serves as a reference of the situation judgment, on the basis of the rate of change of the video signal in the normal situation, the error of the situation judgment can be reduced. In addition, in order to prevent an emergency situation from frequently occurring due to a noise signal, it is preferable that the emergency situation is determined only when the rate of change of the video signal continuously satisfies the above formula (2) for a predetermined time.

In this embodiment, the situation determining means 300 determines the emergency situation based on the rate of change of the video signal calculated by the video comparing means 200. However, instead of the rate of change of the video signal, various known video motion detecting methods May be applied to the image comparing means 200 to calculate the degree of motion of the image.

Next, the alarm broadcasting means 400 receives an instruction for alarm generation from the situation determination means 300 and broadcasts an alarm.

The alarm broadcasting means 400 receives the difference value (v (t) -v ref (t)) between the rate of change of the video signal and the reference value from the situation determination means 300, The volume of the broadcast is adjusted to broadcast the alarm.

3, the alarm broadcasting unit 400 includes an audio signal generator 410, an audio mixer 420, a volume controller 430, a power amplifier 440, and a speaker 450 .

The audio signal generating unit 410 generates an audio signal to be used for an alarm, and can use a digital sound source file, a sound source chip, or the like. The audio mixer 420 processes the audio signal generated through the audio signal generator 410 and outputs the processed audio signal. At this time, the size of the audio signal can be adjusted according to the control of the volume adjusting unit 430, and the volume adjusting unit 430 adjusts the size of the audio signal according to the size of the difference value input from the situation determining unit 300 . Then, the audio signal output through the audio mixer 420 is amplified by the power amplifier 440, and then transmitted to the air through the speaker 450.

As described above, according to the present invention, the volume of the alert broadcast can be adjusted by broadcasting based on the rate of change of the video signal acquired from the surveillance target area, so that the alarm broadcast can be transmitted according to the risk of the surveillance situation or degree of urgency. For example, when the rate of change of a video signal of a surveillance target area such as a prison is large, it is judged to be a very dangerous situation and an alarm is broadcast at a high volume. On the other hand, The alarm can be broadcast at a low volume.

A modification of the alarm broadcasting means shown in Fig. 3 is shown in Fig. The alarm broadcasting means 400 shown in FIG. 4 receives the difference value ((v (t) -v ref (t)) between the rate of change of the video signal and the reference value from the situation determination means 300, A speaker 450 for broadcasting an alarm is selected and an alarm is broadcast through the selected speaker 450. For this purpose, instead of the volume control unit 430 of FIG. 3, And a speaker selection unit 460 that selects a speaker 450 to be selected by the speaker 450. The speaker selection unit 460 switches the output from the power amplification unit 440 and transmits the amplified audio signal only to the selected speaker 450 do.

Thus, by selecting and broadcasting a speaker to broadcast an alarm on the basis of the rate of change of the video signal acquired from the area to be monitored, the alarm broadcast can be transmitted by limiting the area or person requiring the alarm broadcasting. For example, when the rate of change of the video signal is large, it is determined that the situation is very dangerous. Therefore, a large number of speakers are operated so that the alarm broadcasting can be heard over a wide range of areas. On the other hand, It is possible to operate a small number of speakers so that alarm broadcasting can be heard only in a narrow range of areas.

In this embodiment, the alarm broadcasting means 400 is divided into the form of FIG. 3 and the form of FIG. 4. However, the forms of FIG. 3 and FIG. 4 may be combined to constitute the alarm broadcasting means 400. That is, by configuring the alarm broadcasting unit 400 including both the volume control unit 430 and the speaker selection unit 460, it is possible to adjust the volume of the alarm broadcast and select a speaker to broadcast the alarm, have.

≪ Embodiment 2 >

The smart alarm device according to the second embodiment of the present invention further includes status determination means using acoustic signals in the device according to the first embodiment shown in FIG. 1, and a schematic configuration is shown in a block diagram in FIG. 5 .

5, the smart alarm apparatus according to the second embodiment of the present invention includes the image acquiring unit 100, the image comparing unit 200, the situation determining unit 300, and the alarm broadcasting unit 400 The sound acquiring means 500 and the sound comparing means 600 are further provided. The functions of the situation determining means 700 and the alarm broadcasting means 800 in the present embodiment include the functions of the situation determining means 300 and the alarm broadcasting means 400 shown in Fig. 1, Therefore, the drawing numbers are denoted by 700 and 800, respectively, for the sake of distinction.

First, the functions and operations of the image acquiring unit 100 and the image comparing unit 200 are the same as those of the first embodiment.

On the other hand, the sound acquisition means 500 senses sound generated in the monitored area, stores the sensed sound as a digital sound signal, and sends it to the sound comparison means 600. The sound acquiring means 500 may be constituted by an acoustic sensor for converting an acoustic signal into an electric signal and a storage device for storing the acoustic signal as a digital signal.

Next, the acoustic comparing means 600 receives the acoustic signal sent by the acoustic acquiring means 500 and calculates the rate of change of the acoustic signal. The rate of change of the acoustic signal means the rate of change of the magnitude of the acoustic signal over time. The fact that the magnitude of the change in the magnitude of the acoustic signal is high means that the abnormal situation is likely to occur in the monitored area. Therefore, It can be determined that the monitored area is in an emergency situation.

The rate of change of the acoustic signal calculated as described above is compared with the reference value preset by the situation determining means 700 together with the rate of change of the above-mentioned calculated signal. That is, if the value obtained by adding the rate of change of the video signal and the rate of change of the sound signal is larger than the reference value, it is determined that the state of the object is abnormal and the surrounding motion is abnormally increased. For example, the reference values of image signal according to the rate of change of the acoustic signal in accordance with a change rate of an image signal according to the time (t) to v (t), time (t) to a (t), time (t) v ref ( (t), the reference value of the acoustic signal according to the time (t) is a ref (t).

(t) + a ref (t) > v ref (t) + a ref (t)

At this time, if the relative difference in magnitude between the rate of change of the video signal v (t) and the rate of change of the audio signal a (t) is large, it is preferable to normalize the video signal and the audio signal for use.

The reference value a ref (t) of the acoustic signal can use the acoustic signal obtained when the monitored region is in a normal state, as in the reference value of the video signal. That is, the reference value v ref (t) of the video signal can be set based on the average value v m (t) of the rate of change of the video signal in the steady state similarly to the first embodiment described above, The reference value a ref (t) of the sound signal can be set based on the average value a m (t) of the rate of change of the sound signal when it is in the steady state. That is, the reference value can be set as shown in the following equation (4).

v ref (t) + a ref (t) = v m (t) + a m (t) + k (4)

Here, k is equal to the constant value (k) in the equation (2) of the first embodiment, and the frequency of occurrence of the alarm can be adjusted according to the size.

By setting the reference value as a reference for the situation determination based on the change rate of the video signal and the sound signal in the normal situation, the error of the situation judgment can be reduced. In particular, the sum of the video signal and the sound signal more clearly indicates the difference between the normal situation and the emergency situation, thereby enabling more accurate judgment.

In addition, as described in the first embodiment, in order to prevent an emergency situation from frequently occurring due to a noise signal, only when the rate of change of the sum of the video signal and the acoustic signal continuously satisfies Equation (4) It is preferable to determine that the situation is an emergency.

On the other hand, the alarm broadcasting means 800 in this embodiment operates in substantially the same manner as the alarm broadcasting means 400 in the first embodiment described above. However, there is a difference only in that the alarm broadcasting means 800 receives the difference value between the sum of the video signal change rate and the sound signal change rate from the situation determination means 700 and the reference value. This difference value d (t) is shown in equation (5).

d (t) = v ref (t) + a ref (t) - vm (t) + am (t)

The alarm broadcasting means 800 broadcasts an alarm by adjusting the volume magnitude or selecting a speaker for broadcasting an alarm according to the difference value.

The smart alarm device according to the embodiments of the present invention described above can exhibit a more excellent surveillance and alarm effect when the image of the surveillance area, such as a prison or a school, exhibits a standardized characteristic. However, it can be applied to surveillance other than prison or school, and if the method of setting the reference value is changed according to the surveillance target, better surveillance and alarm effect will be obtained.

While the present invention has been described with reference to the preferred embodiments described above and the accompanying drawings, it is to be understood that the invention may be embodied in different forms without departing from the spirit or scope of the invention. Accordingly, the scope of the present invention is defined by the appended claims, and is not to be construed as limited to the specific embodiments described herein.

100: image acquiring means 200: image comparing means
300: Situation judging means 400: Alarm broadcasting means
410: Audio signal generator 420: Audio mixer
430: volume adjusting unit 440: power amplifying unit
450: speaker 460: speaker selector
500: sound acquisition means 600: sound comparison means
700: situation determining means 800: alarm broadcasting means

Claims (12)

It is a smart alarm system that monitors the situation of a monitored area and automatically broadcasts an alarm according to the monitoring result,
An image acquiring means for photographing a surveillance target area and storing the photographed image as a digital image signal;
Image comparing means for receiving a video signal from the image acquiring means, dividing the image signal into frames, comparing two adjacent frames on a pixel-by-pixel basis, and calculating a rate of change of the video signal;
Sound acquisition means for sensing sound generated in the monitored area and storing the sensed sound as a digital sound signal;
Sound comparing means for receiving a sound signal from the sound acquiring means and calculating a rate of change of the sound signal;
And an emergency state in which an alarm is to be generated when the sum of the rate of change of the video signal and the rate of change of the sound signal is greater than a predetermined reference value in response to the change rate of the video signal and the sound signal from the sound acquiring means, Condition determining means for determining whether or not the vehicle is running; And
And an alarm broadcasting means for receiving an instruction regarding the occurrence of an alarm from the situation determination means and broadcasting an alarm,
The situation determination means
The video signal obtained when the monitored area is in a normal situation is divided into frames, and the rate of change of the video signal is obtained by comparing the video signals on a pixel-by-pixel basis for two adjacent frames,
A rate of change of the sound signal is obtained by receiving the sound signal obtained when the monitored area is in a normal situation,
And sets the reference value based on a sum of an average value of the rate of change of the image signal and an average value of the rate of change of the sound signal.
The method according to claim 1,
The image comparison means
Calculates the number of changed pixels between two frames adjacent to each other, and calculates a rate of change of the number of changed pixels as a rate of change of the video signal.
The method according to claim 1,
The image comparison means
Wherein the color information is removed from the image signal from the image acquiring unit to convert the image information into a monochrome image, and then the contrast ratio of the image signal is calculated by comparing the two images in units of two adjacent frames.
delete delete delete delete delete The method according to claim 1,
The situation determining means sends the difference value between the sum of the rate of change of the video signal and the rate of change of the sound signal and the reference value to the alert broadcasting means together with an instruction regarding the alarm generation,
Wherein the alarm broadcasting means broadcasts an alarm by adjusting a volume magnitude of the alarm broadcast according to the magnitude of the difference value.
The method according to claim 1,
The situation determining means sends the difference value between the sum of the rate of change of the video signal and the rate of change of the sound signal and the reference value to the alert broadcasting means together with an instruction regarding the alarm generation,
Wherein the alarm broadcasting means selects a speaker for broadcasting the alarm according to the magnitude of the difference value, and broadcasts the alarm through the selected speaker.
The method of claim 9,
The alarm broadcasting means
An audio signal generator for generating an audio signal;
An audio mixer for processing and outputting the audio signal generated by the audio signal generator;
A volume controller for controlling the audio mixer according to the magnitude of the difference value to adjust the size of the audio signal;
A power amplifier for amplifying an audio signal output through the audio mixer; And
And a speaker for transmitting the amplified signal from the power amplifying unit.
The method of claim 10,
The alarm broadcasting means
An audio signal generator for generating an audio signal;
An audio mixer for processing and outputting the audio signal generated by the audio signal generator;
A power amplifier for amplifying an audio signal output through the audio mixer;
A plurality of speakers for transmitting the amplified signals from the power amplifier; And
And a speaker selecting unit for selecting a speaker to broadcast an alarm according to the magnitude of the difference value.
KR1020150148345A 2015-10-23 2015-10-23 Smart alarm broadcasting apparatus KR101733305B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109598885A (en) * 2018-12-21 2019-04-09 广东中安金狮科创有限公司 Monitoring system and its alarm method
KR101967902B1 (en) * 2017-11-09 2019-08-19 주식회사 코리트 A security control system using the smart-fence

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101967902B1 (en) * 2017-11-09 2019-08-19 주식회사 코리트 A security control system using the smart-fence
CN109598885A (en) * 2018-12-21 2019-04-09 广东中安金狮科创有限公司 Monitoring system and its alarm method
CN109598885B (en) * 2018-12-21 2021-06-11 广东中安金狮科创有限公司 Monitoring system and alarm method thereof

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