JP2006060328A - Monitoring method and monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring method and a monitoring system that can record imaging data of a monitored object in response to an abnormal sound of destruction of the photographed object. <P>SOLUTION: The monitoring system is equipped with: an imaging device 12 which outputs imaging data of the monitored object; a comprehensive processing device 22 having a temporary memory which temporarily stores the imaging data outputted from the imaging device 12; a sound collecting device 14 which collects sound and converts it into an audio signal; a sound collection processing device 24 which determines whether the audio data converted by the sound collecting device 14 meet designated conditions; and a video recording device 26 which records the imaging data stored in the temporary memory according to the determination result of the sound collection processing device 24, and the monitoring system detects an abnormal sound to record the imaging data of the monitored object. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a monitoring method and a monitoring system for recording imaging data to be monitored output from imaging means.

Imaging devices such as surveillance cameras are widely used as means for recording the state of crimes such as theft. For example, a surveillance camera is installed in a building where an ATM (Automatic [or automated] Teller Machine) is installed, or an ATM is recorded, and video around the ATM is recorded (for example, see Patent Document 1). The recorded video is used, for example, as a material for identifying a criminal technique or a criminal when an ATM is illegally used or destroyed.
JP-A-56-149880

  In recent years, there has been a case in which a building in which an ATM is installed is destroyed using a heavy machine or the like, and the ATM itself is stolen. In this case, there is a possibility that the surveillance camera will break down or stop when the building is destroyed. In addition, when a surveillance camera is installed in the ATM, the surveillance camera is stolen together with the ATM. If there is no record of the state of the crime, for example, when the operation of the surveillance camera is stopped, it is difficult to identify the crime method or the criminal. Even when the surveillance camera is operating, it is difficult to identify the criminal because the criminal himself is unlikely to be photographed because only a part of the heavy machinery has been photographed.

  In the case of a surveillance camera, since recording is always performed, the captured image data is often thinned out, for example, by recording at intervals of 30 seconds. Furthermore, in the case of a surveillance camera, recording is often performed repeatedly on the same recording medium. Therefore, the recorded image quality is generally low, and it may be difficult to identify the criminal. Moreover, since repeated recording is performed, there is a possibility that the portion where the crime is recorded may be overwritten.

  The present invention has been made in view of such circumstances, and provides a monitoring method and a monitoring system capable of recording imaging data to be monitored in response to abnormal sounds such as destruction of the imaging target. With the goal.

  Another object of the present invention is to provide a monitoring system capable of preventing destruction or theft of the recording means.

  Another object of the present invention is to provide a monitoring system capable of easily grasping erroneous determination of abnormal sound and improving the determination accuracy.

  Another object of the present invention is to provide a monitoring system that can easily determine abnormal sounds by comparing the volume levels.

  Another object of the present invention is to provide a monitoring method and a monitoring system capable of determining an abnormal sound with high accuracy based on sound quality.

  Another object of the present invention is to provide a monitoring system capable of recording the state of destruction, theft, etc. even when a building is destroyed and an important internal object is stolen.

  Another object of the present invention is to provide a monitoring system in which noise contained in an audio signal is reduced and the accuracy of abnormal sound determination is improved.

  A monitoring method according to a first aspect of the present invention is an imaging unit that outputs imaging data to be monitored, a temporary storage unit that temporarily stores imaging data, a sound collection unit that collects sound and converts it into an audio signal, A monitoring method using a determination unit that determines whether or not an audio signal satisfies a predetermined condition and a recording unit that records imaging data according to the determination result, the imaging data output from the imaging unit being The step of storing in the temporary storage unit, the step of determining by the determination unit whether or not the sound signal converted by the sound collection unit satisfies a predetermined condition, and the step of storing in the temporary storage unit according to the result of the determination Recording imaging data in a recording means.

  In the monitoring method according to a second invention, in the first invention, the predetermined condition is a condition relating to a volume and / or a frequency component of the audio signal, and the step of determining includes determining whether the volume and / or the frequency component of the audio signal is a predetermined condition. It is characterized by determining whether these are satisfied.

  According to a third aspect of the present invention, there is provided a monitoring system comprising: an imaging unit that outputs imaging data to be monitored; a temporary storage unit that temporarily stores imaging data output from the imaging unit; Sound collecting means for conversion, determination means for determining whether or not the sound signal converted by the sound collection means satisfies a predetermined condition, and stored in the temporary storage means according to the determination result of the determination means Recording means for recording imaging data.

  According to a fourth aspect of the present invention, there is provided a monitoring system comprising: imaging means for outputting imaging data to be monitored; sound collection means for collecting sound and converting the sound into an audio signal; and a sound signal converted by the sound collection means is a predetermined condition. A determination unit that determines whether or not the image data satisfies the condition, a transmission unit that transmits the imaging data output by the imaging device, and a determination result when the determination unit determines that the predetermined condition is satisfied, and the transmission unit transmits The receiving means for receiving the imaging data and the determination result, the temporary storage means for temporarily storing the imaging data received by the receiving means, and the temporary storage means according to the determination result received by the receiving means Recording means for recording the captured image data.

  According to a fifth aspect of the present invention, there is provided a monitoring system comprising: imaging means for outputting imaging data to be monitored; sound collecting means for collecting sound and converting it into an audio signal; and imaging data and sound collecting means output by the imaging device for conversion. Transmitting means for transmitting the received audio signal; receiving means for receiving the imaging data and audio signal transmitted by the transmitting means; temporary storage means for temporarily storing the imaging data received by the receiving means; and receiving means; A determination unit configured to determine whether or not the received audio signal satisfies a predetermined condition; and a recording unit configured to record the imaging data stored in the temporary storage unit according to a determination result of the determination unit. And

  In the monitoring system according to a sixth aspect of the present invention, in any one of the third to fifth aspects, the predetermined condition is a condition that a volume of the audio signal exceeds a predetermined volume, and the determination means is a volume of the received audio signal. Is configured to determine whether or not a predetermined condition is satisfied.

  The monitoring system according to a seventh aspect of the present invention is the monitoring system according to any one of the third to sixth aspects, wherein the predetermined condition is a condition related to a frequency component of the audio signal, and further includes a calculation unit that obtains the frequency component of the audio signal. Is configured to determine whether or not the frequency component obtained by the computing means satisfies a predetermined condition.

  The monitoring system according to an eighth aspect of the present invention is the monitoring system according to any one of the third to seventh aspects, wherein the monitoring target is a building.

  A monitoring system according to a ninth invention is characterized in that, in the eighth invention, the sound collecting means is arranged inside the building.

  In the first or third invention, the monitoring target is imaged by the imaging means, and the imaging data is output. Further, the surrounding sound is collected by the sound collecting means and converted into a sound signal. The imaging data output from the imaging unit is temporarily stored in the temporary storage unit. For example, imaging data from the present to a predetermined time before the past 5 minutes or the like is stored in the temporary storage means. The sound signal converted by the sound collecting means is sent to the determining means, and it is determined whether or not a predetermined condition is satisfied. For example, it is determined whether or not the audio signal satisfies a sound condition in which the monitoring target is destroyed. When the predetermined condition is satisfied, the imaging data stored in the temporary storage unit is recorded in the recording unit. Alternatively, when normal sound conditions are not satisfied, the imaging data may be recorded in the recording means. When the determination means determines that the sound signal of the sound collection means satisfies the condition of the destructive sound (abnormal sound) to be monitored, the image pickup means includes the image data stored in the temporary storage means, for example, from the past 5 minutes. The captured image data is recorded in the recording means.

  In the fourth invention, the imaging means, the sound collection means, the determination means, and the imaging data output by the imaging device are transmitted around the installation location to be monitored, and it is determined that the determination means satisfies the predetermined condition. And a transmission means for transmitting a determination result in the case of having been performed. In addition, a receiving unit that receives imaging data or a determination result transmitted by the transmitting unit, a temporary storage unit, and a recording unit are arranged in a monitoring center that is different from the installation location of the monitoring target. The temporary storage means temporarily stores the imaging data received by the receiving means. The recording unit records the imaging data stored in the temporary storage unit according to the determination result received by the receiving unit. The transmission means and the reception means are connected to a communication line such as a telephone line.

  The imaging data captured by the imaging unit is always transmitted from the transmission unit and stored in the temporary storage unit on the management center side. For example, when the determination unit determines that the sound signal satisfies the condition of the destructive sound to be monitored at the installation location of the monitoring target, the determination result is transmitted from the transmission unit. In the management center, when the reception unit receives the transmitted determination result, the imaging data including the imaging data that goes back to the past 5 minutes, for example, stored in the temporary storage unit is recorded in the recording unit.

  In the fifth invention, the imaging means, the sound collection means, and the transmission means for transmitting the imaging data output by the imaging device and the sound signal converted by the sound collection means are disposed around the installation location to be monitored. . In addition, a receiving unit that receives imaging data and audio signals transmitted by the transmitting unit, a temporary storage unit, a determination unit, and a recording unit are arranged in a monitoring center that is different from the installation location of the monitoring target. The temporary storage means temporarily stores the imaging data received by the receiving means. The determining means determines whether or not the audio signal received by the receiving means satisfies a predetermined condition. The transmission means and the reception means are connected to a communication line such as a telephone line.

  The imaging data captured by the imaging unit is always transmitted from the transmission unit and stored in the temporary storage unit on the management center side. Also, the audio signal converted by the sound collecting means is always transmitted from the transmitting means and sent to the determining means on the management center side. For example, in the management center, when the determination unit determines that the sound signal of the sound collection unit includes a destructive sound to be monitored, the image data including the image data that has been stored in the temporary storage unit, for example, back in the past 5 minutes, is stored. And recorded in the recording means.

  In the sixth invention, the predetermined condition is a condition that the volume of the audio signal exceeds the predetermined volume, and the determination means determines whether or not the volume of the received audio signal satisfies the predetermined condition. The predetermined condition can be set based on a volume that can be regarded as normal, or can be set based on a volume that can be regarded as having an abnormality.

  In the second or seventh invention, the predetermined condition is a condition relating to the frequency component of the audio signal, and the frequency component of the audio signal is obtained by the computing means, and whether or not the frequency component obtained by the computing means satisfies the predetermined condition. Is determined by the determining means. For example, it can be determined by the determining means whether or not the predetermined frequency component of the audio signal exceeds a predetermined level. The predetermined condition can be set based on a frequency component that can be regarded as normal, or can be set based on a frequency component that can be regarded as abnormal.

  In the eighth invention, the monitoring object is a building. For example, it is a building in which ATM is installed. For example, when a building is destroyed and an internal ATM is stolen, it is possible to record the destruction of the building and the state of the theft of the ATM in the recording means based on the destruction sound (abnormal sound).

  In the ninth invention, the sound collecting means is arranged inside the building. When the sound collecting means is arranged outside the building, the sound signal includes various noises such as a passing vehicle. On the other hand, when the sound collecting means is arranged inside the building, the sound signal includes limited sound such as ATM operation sound. By disposing the sound collecting means inside the building, noise included in the audio signal is reduced, so that the determination accuracy of the determination means is improved.

  According to the first or third invention, when the determination unit determines that the sound satisfying the predetermined condition is generated around the shooting target, the monitoring target imaging data captured by the imaging unit is recorded in the recording unit. In response to an abnormal sound such as destruction of the photographing target, it becomes possible to record the imaging data of the monitoring target. Since the recording is performed when an abnormal sound occurs, the image quality of the recorded imaging data is improved as compared with the case where the imaging data obtained by imaging the monitoring target is continuously recorded. Further, since the imaging data from the present to a predetermined time before is stored in the temporary storage means, it is possible to record the imaging data captured from the predetermined time before the abnormal sound is detected in the recording means. .

  According to the fourth or fifth invention, by installing the recording means in a management center or the like that is different from the installation location of the monitoring target, the maintainability and reliability of the recording means are improved, and the recording means is destroyed or stolen. Can be prevented. In addition, collective monitoring is possible at a management center or the like. Furthermore, it becomes possible to immediately confirm the imaging data recorded in the recording means at the monitoring center, and it is possible to quickly respond to the abnormality.

  According to the fifth invention, by installing the determination means in a management center or the like different from the installation location of the monitoring target, it is possible to easily grasp, for example, erroneous determination by the determination means, and the determination accuracy of abnormal sound is improved. Improvements can be made.

  According to the sixth aspect, by determining the abnormal sound based on the volume of the audio signal, the abnormal sound can be easily determined by comparing the volume levels.

  According to the 2nd or 7th invention, the abnormal sound can be determined with high accuracy based on the sound quality by determining the abnormal sound based on the frequency component of the audio signal.

  According to the eighth aspect of the present invention, by imaging a building in which an important object such as ATM is imaged, even if the building is destroyed and the inside important object is stolen, the state of destruction or theft Can be recorded in the recording means.

  According to the ninth aspect, by arranging the sound collecting means inside the building to be monitored, noise outside the building is reduced, and noise included in the audio signal is reduced. improves.

Hereinafter, the present invention will be specifically described with reference to the drawings illustrating embodiments thereof.
(First embodiment)
FIG. 1 is a block diagram showing an example of a monitoring system 10 according to the present invention. In this description, imaging of a building (monitoring target) in which ATM (Automatic [or Automated] Teller Machine) is installed is taken as an example. The monitoring system 10 includes an imaging device (imaging means) 12 such as a digital camera, a sound collection device (sound collection means) 14 such as a microphone (microphone), and a recording processing device connected to the imaging device 12 and the sound collection device 14. 20. The imaging device 12 outputs imaging data composed of image frames at predetermined time intervals, for example, and the sound collecting device 14 outputs audio data (audio signal).

  The recording processing device 20 includes a sound collection processing device 24 connected to the sound collection device 14, a general processing device 22 connected to the imaging device 12 and the sound collection processing device 24, and a recording device connected to the general processing device 22. (Recording means) 26. The sound collection processing device (determination means) 24 determines whether or not the sound data received from the sound collection device 14 satisfies a predetermined condition regarding abnormal sound such as destruction of a building, and determines that the predetermined condition is satisfied (abnormal If a sound is detected), an abnormal sound detection signal is sent to the general processing device 22.

  The abnormal sound can be determined based on the volume and / or frequency component of the audio data. For example, the sound collection processing device 24 compares the volume of the audio data with the reference level, and if the volume exceeds the reference level, an abnormal sound detection signal can be sent to the general processing device 22. Further, for example, the frequency component of the audio data is obtained by the sound collection processing device (calculation means) 24, and when the predetermined frequency component exceeds the reference level, it is possible to send an abnormal sound detection signal to the general processing device 22.

  In this description, the sound collection processing device 24 includes a storage device such as a ROM (Read Only Memory) or a flash memory in which abnormal sound information related to abnormal sounds such as a reference level of volume or a reference level of a predetermined frequency component is stored. . In addition, the sound collection processing device 24 includes an arithmetic device that obtains frequency components of audio data. The arithmetic device can also compare the volume with the reference level.

  The integrated processing device 22 includes a temporary memory (temporary storage means) such as a RAM (Random Access Memory) or a flash memory that temporarily stores imaging data received from the imaging device 12. The temporary memory stores imaging data for a fixed time from the present to a predetermined time before (for example, 5 minutes before). The integrated processing device 22 performs storage management of the temporary memory. The integrated processing device 22 deletes the image data (image frame) stored first in the temporary memory and newly stores new image data (image frame). When the general processing device 22 receives an abnormal sound detection signal from the sound collection processing device 24, the general processing device 22 sends a recording instruction to the recording device and sends imaging data stored in the temporary memory to the recording device 26. The imaging data is sent to the recording device 26 in order from the imaging data (image frame) previously stored in the temporary memory.

  The recording device 26 is a device that records (records) imaging data on a recording medium such as a magnetic tape, and records the imaging data received from the integrated processing device 22 in response to a recording instruction received from the integrated processing device 22. Do.

  2 (a) and 2 (b) are schematic views showing an installation example of the monitoring system 10 according to the present invention, and FIG. 2 (b) is a side view seen from the direction A of FIG. 2 (a). . A sound collector 14 is attached to the building 2 where the ATM is installed. An imaging device 12 and a recording processing device 20 are attached to the utility pole 4 in the site of the building 2. The monitoring system 10 is installed at a monitoring place.

  FIG. 3 is a flowchart showing an example of a recording procedure using the monitoring system according to the present invention. The imaging data output from the imaging device 12 is stored in a temporary memory of the general processing device 22. The integrated processing device 22 deletes the oldest imaging data (image frame) in the temporary memory and newly stores new imaging data. The sound data output from the sound collection device 14 is sent to the sound collection processing device 24. The sound collection processing device 24 obtains a frequency component and compares it with abnormal sound information to determine whether or not the sound is abnormal. When it is determined that the sound is abnormal (abnormal sound is detected) (S10: YES), the sound collection processing device 24 transmits an abnormal sound detection signal to the general processing device 22 (S12).

  When receiving the abnormal sound detection signal (S14: YES), the general processing device 22 transmits the imaging data stored in the temporary memory to the recording device 26 and transmits a recording instruction to the recording device 26 (S16). . When the recording device 26 receives a recording instruction (S18: YES), the recording device 26 records the imaging data received from the general processing device 22 (S20).

  When the abnormal sound is detected, the imaging data stored in the temporary memory before detecting the abnormal sound and the imaging data output from the imaging device 12 after detecting the abnormal sound are recorded in the recording device 26. For example, when imaging data for the past 5 minutes is stored in the temporary memory, the imaging data from 5 minutes before the abnormal sound is detected can be recorded in the recording device 26. For example, when an abnormal sound that destroys a building in which an ATM is installed is detected, it is possible to record image data from, for example, five minutes before the abnormal sound is detected, in the recording device 26. It is also possible to record the state before destruction started.

  In addition, since the imaging data is recorded when an abnormal sound is detected, it is possible to improve the recording image quality as compared with the case where recording is always performed. For example, when recording is always performed, the image quality is generally low because, for example, imaging data is recorded every 30 seconds or repeatedly recorded on the same recording medium. In the present invention, since recording is performed when an abnormal sound is detected, it is not necessary to perform thinning or repeated recording of imaged data, and recording can be performed with high image quality. Since it is recorded with high image quality, it is convenient for identifying the criminal.

  In the above-described embodiment, when an abnormal sound is detected, the recording instruction and the imaging data are transmitted to the recording device 26. However, the transmission of the imaging data itself can be used as the recording instruction. For example, the recording device 26 detects the input of the imaging data when the imaging data is input from the general processing device 22, records the input imaging data, and if the input of the imaging data is lost, the recording device 26 Recording can be stopped.

(Second Embodiment)
FIG. 4 is a block diagram illustrating an example of a monitoring system according to the present invention. The monitoring system includes an imaging device 12, a sound collection device 14, and a relay processing device (sound collection processing device 24, relay device 32) 30 provided at a monitoring location, and a communication device 33 provided at a monitoring center remote from the monitoring location. And a general processing device 22 and a recording device 26. The imaging device 12, the sound collecting device 14, the sound collecting processing device 24, the general processing device 22, and the recording device 26 are the same as those in the first embodiment.

  The relay processing device 30 includes a sound collection processing device 24 connected to the sound collection device 14 and a relay device 32 connected to the imaging device 12 and the sound collection processing device 24. The relay device (transmission means) 32 is connected to a communication line 34 such as a telephone line. The total processing device 22 is connected to the communication line 34 via a communication device (reception means) 33. The relay device 32 and the communication device 33 include communication devices such as a modem. The communication line 34 may be wireless. A recording device 26 is connected to the general processing device 22.

  The relay device 32 always transmits the imaging data received from the imaging device 12 to the communication device 33 via the communication line 34. Further, when the relay device 32 receives the abnormal sound detection signal from the sound collection processing device 24, the relay device 32 transmits the abnormal sound detection signal to the communication device 33 via the communication line 34. The imaging data output from the imaging device 12 and the abnormal sound detection signal output from the sound collection processing device 24 are sent from the relay device 32 to the general processing device 22 via the communication line 34 and the communication device 33. The same operation as in the first embodiment is performed.

  By providing the recording device 26 in the monitoring center, it becomes possible to immediately check the imaging data recorded in the recording device 26 at the monitoring center, and it is possible to quickly cope with the detection of abnormal sounds. In addition, since the recording device 26 is installed in the monitoring center, the maintenance of the recording device is facilitated and the reliability of recording is increased as compared with the case where the recording device 26 is installed in a monitoring place. Furthermore, by installing the recording device 26 in the monitoring center, for example, recording devices of a plurality of monitoring systems can be installed in the monitoring center, and each monitoring location can be centrally monitored by the monitoring center.

  In the second embodiment described above, the sound collection processing device 24 is provided at the monitoring place, and the abnormal sound detection signal is transmitted from the relay device 32 to the general processing device 22 via the communication line 34 and the communication device 33. As shown in FIG. 5, the sound collection processing device 24 is provided in the monitoring center, and the sound signal output from the sound collection device 14 is always sent from the relay device 32 via the communication line 34 and the communication device 33. It is also possible to transmit to 24.

  In the example of FIG. 5, the minimum configuration of the imaging device 12, the sound collection device 14, and the relay device 32 is installed at the monitoring location, and the installation cost and installation space of the monitoring location can be minimized. is there. Further, since the sound collection processing device 24 is installed in the management center, for example, confirmation and analysis such as erroneous detection of abnormal sound can be performed on the management center side.

  In the monitoring system shown in FIGS. 4 and 5, the abnormal sound detection signal or audio data and the imaging data are transmitted via the communication line 34. If the bandwidth is occupied by the imaging data, an abnormality occurs. The sound detection signal or the voice data can be transmitted from the relay device 32 to the general processing device 22 or the sound collection processing device 24 via another communication line.

  The sound collecting device 14 can be installed inside or outside the building 2 where the ATM is installed. For example, as shown in FIGS. Similarly to the device 20, it can be attached to the utility pole 4. However, the installation of the sound collecting device 14 inside the building 2 is less susceptible to external noise, and the accuracy of abnormal sound determination is improved. It is also possible to arrange the sound collectors 14 both inside and outside the building 2 and detect abnormal sounds based on both audio signals.

  It is also possible to install a plurality of imaging devices 12 at the same monitoring location. FIG. 7 is a block diagram illustrating an example of the monitoring system 11 in which a plurality of imaging devices are installed at the same monitoring location. In the example of FIG. 7, two imaging devices 12 a and 12 b are installed, the imaging device 12 a outputs imaging data A, and the imaging device 12 b outputs imaging data B. The recording processing device 21 includes two recording devices 26a and 26b, and the general processing device 23 includes a temporary memory A (storage area A) for storing imaging data A and a temporary memory B (storage area) for storing imaging data B. B), when the abnormal sound detection signal is received, the recording instruction and the imaging data A are transmitted to the recording device 26a, and the recording instruction and the imaging data B are transmitted to the recording device 26b. When a plurality of imaging devices are installed, since the building is imaged from different angles, the occurrence of blind spots can be suppressed.

  In each of the above-described embodiments, for example, when an ATM is installed in a building to be monitored, an alarm is often installed for ATM crime prevention. When an ATM is stolen, there is a high possibility that an alarm will be activated, and it is possible to detect the occurrence of an ATM theft by treating the alarm as an abnormal sound. For example, abnormal sound information related to an alarm can be set in the sound collection processing unit 24 in advance.

  For abnormal sound information, the volume or frequency component conditions that can be regarded as normal are registered, and it is determined that an abnormality has occurred when the condition deviates from the conditions that can be regarded as normal, or the volume or frequency at which an abnormality can be regarded as occurring. Component conditions and the like are registered, and it is possible to determine that an abnormality has occurred when a condition that can be regarded as abnormal is met.

It is a block diagram which shows the example of the monitoring system which concerns on this invention. It is a schematic diagram which shows the example of installation of the monitoring system which concerns on this invention. It is a flowchart which shows the example of the video recording procedure using the monitoring system which concerns on this invention. It is a block diagram which shows the example of the monitoring system which concerns on this invention. It is a block diagram which shows the example of the monitoring system which concerns on this invention. It is a schematic diagram which shows the example of installation of the monitoring system which concerns on this invention. It is a block diagram which shows the example of the monitoring system which concerns on this invention.

Explanation of symbols

2 Building 4 Utility Pole 10, 11 Monitoring System 12, 12a, 12b Imaging Device 14 Sound Collection Device 20 Recording Processing Device 22 General Processing Device 24 Sound Collection Processing Device 26, 26a, 26b Recording Device 30 Relay Processing Device 32 Relay Device 33 Communication apparatus

Claims (9)

Imaging means for outputting imaging data to be monitored, temporary storage means for temporarily storing imaging data, sound collecting means for collecting sound and converting it into an audio signal, and whether the audio signal satisfies a predetermined condition A monitoring method using a determination unit that determines whether or not, and a recording unit that records imaging data according to a determination result,
Storing the imaging data output from the imaging means in the temporary storage means;
Determining by the determining means whether or not the audio signal converted by the sound collecting means satisfies a predetermined condition;
And a step of recording the imaging data stored in the temporary storage means in the recording means in accordance with the result of the determination. The predetermined condition is a condition relating to the volume and / or frequency component of the audio signal,
The monitoring method according to claim 1, wherein the determining step determines whether the volume and / or frequency component of the audio signal satisfies a predetermined condition. Imaging means for outputting imaging data to be monitored;
Temporary storage means for temporarily storing imaging data output from the imaging means;
Sound collecting means for collecting sound and converting it into a sound signal;
Determining means for determining whether or not the sound signal converted by the sound collecting means satisfies a predetermined condition;
A monitoring system comprising: a recording unit that records the imaging data stored in the temporary storage unit according to a determination result of the determination unit. Imaging means for outputting imaging data to be monitored;
Sound collecting means for collecting sound and converting it into a sound signal;
Determining means for determining whether or not the sound signal converted by the sound collecting means satisfies a predetermined condition;
Transmitting means for transmitting imaging data output by the imaging device, and transmitting a determination result when the determination means determines that the predetermined condition is satisfied;
Receiving means for receiving imaging data and determination results transmitted by the transmitting means;
Temporary storage means for temporarily storing imaging data received by the receiving means;
A monitoring system comprising: a recording unit that records the imaging data stored in the temporary storage unit according to the determination result received by the receiving unit. Imaging means for outputting imaging data to be monitored;
Sound collecting means for collecting sound and converting it into a sound signal;
Transmitting means for transmitting imaging data output by the imaging apparatus and an audio signal converted by the sound collecting means;
Receiving means for receiving imaging data and audio signals transmitted by the transmitting means;
Temporary storage means for temporarily storing imaging data received by the receiving means;
Determining means for determining whether the audio signal received by the receiving means satisfies a predetermined condition;
A monitoring system comprising: a recording unit that records the imaging data stored in the temporary storage unit according to a determination result of the determination unit. The predetermined condition is a condition that the volume of the audio signal exceeds a predetermined volume,
The monitoring system according to claim 3, wherein the determination unit is configured to determine whether or not a volume of the received audio signal satisfies a predetermined condition. The predetermined condition is a condition related to a frequency component of an audio signal,
It further comprises a calculation means for obtaining the frequency component of the audio signal,
The monitoring system according to claim 3, wherein the determination unit is configured to determine whether the frequency component obtained by the calculation unit satisfies a predetermined condition.   The monitoring system according to claim 3, wherein the monitoring target is a building.   The monitoring system according to claim 8, wherein the sound collecting means is disposed inside the building.

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