JP2006094251A - Monitoring camera and monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid futility in photographing image and photographing operation, by taking a photograph with a center of the source position of abnormal sound only when the abnormal sound occurs. <P>SOLUTION: If outer sound is entered in a voice input unit 13, a tone quality determining unit 15 determines whether the outer sound is abnormal one or not based on a voice signal of the outer sound. A position detecting unit 14 detects the source position of the outer sound based on the voice signal of the outer sound. A control unit 16 drives a camera main body 1a based on both results of the tone quality determining unit 15 and the position detecting unit 14. As an example, if the outer sound is determined as abnormal one by the tone quality determining unit 15 and the source position of the outer sound is detected by the position detecting unit 14, the posture of the camera main body 1a is changed in the direction of the source position of the outer sound by the control unit 16, and further an angle of field change is carried out by the control unit 16 by changing a focal length of a photographing lens 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a surveillance camera and a surveillance system for crime prevention.

  In various facilities such as stores, surveillance cameras are often installed for security reasons and the surroundings are monitored around the clock. In a system using such a monitoring camera, an image photographed by the monitoring camera is usually recorded on a recording medium such as a tape. However, if such recording is always performed, a huge amount of recording medium is used. And power consumption is increased.

In this regard, for example, in the system disclosed in Patent Document 1, the camera is operated only when a certain volume or more is detected or when a silent state continues for a certain or more time. As a result, the shooting time of the camera is shortened as compared with the case of always shooting with the camera, so that the amount of recording medium for recording the shot image can be reduced and the power consumption is also expected to be reduced. In addition, when the above system is constructed in a hospital, for example, the patient in the hospital is not always monitored by the camera, so that the patient's privacy can be maintained within a certain range.
JP 2003-333583 A

  By the way, the system of Patent Document 1 performs photographing by a surveillance camera based on the presence or absence or magnitude of an external sound, and does not specify the position (sound source) where the external sound is generated. For this reason, it is considered that the shooting by the surveillance camera is performed at a wide angle so that the place can be taken no matter where the sound is generated. In this case, since the sound source portion appears small in the captured image, it is difficult to check the sound source portion in detail. In addition, since an image photographed at a wide angle includes many portions that are not related to the sound source, the photographed image is wasteful. Furthermore, in the system described above, shooting is started no matter what sound is generated, so there is a lot of waste in the shooting operation.

  The present invention has been made in order to solve the above-described problems, and the purpose of the present invention is to capture an image of the abnormal sound generation center only when an abnormal sound is generated. It is an object of the present invention to provide a surveillance camera and a surveillance system that can avoid waste of images and photographing operations.

  The surveillance camera of the present invention includes a sound input means for inputting an external sound, and a sound quality determining means for determining whether or not the external sound is an abnormal sound based on a sound signal of the external sound input to the sound input means. And a position detecting means for detecting a position where the external sound is generated based on a sound signal of the external sound input to the sound input means, a camera body having an image sensor, and a control means for driving and controlling the camera body. And the control means drives the camera body based on both the determination result of the sound quality determination means and the detection result of the position detection means.

  According to the above configuration, when an external sound is input to the voice input unit, the control unit determines the result of the determination by the sound quality determination unit, that is, the determination result of whether or not the external sound is an abnormal sound, and the position detection. The camera body is driven based on the detection result of the means, that is, the detection result of the external sound generation position.

  For example, if it is determined that the external sound is abnormal sound by the sound quality determination means and the position of the external sound (abnormal sound) is detected by the position detection means, the control means is directed to the direction of the generation position of the abnormal sound. Change the orientation of the camera body or change the focal length of the photographic lens (change the angle of view, change the magnification). On the other hand, for example, if the sound quality determination means determines that the external sound is not an abnormal sound, the control means does not drive the camera body even if the position detection means detects the generation position of the external sound (depending on the camera body). Do not shoot).

  As described above, the control unit identifies the location where the abnormal sound is generated based on both the determination result of the sound quality determination unit and the detection result of the position detection unit, and drives the camera body (for example, the orientation of the camera body). Change of the focal length), the location where the abnormal sound is generated can be finely imaged by the imaging element of the camera body. That is, it is possible to reduce as much as possible the inclusion of information that is not related to necessary information (information about the location of abnormal sound) in the captured image (information about peripheral locations), and avoiding waste in the captured image. can do. Further, since the camera body is driven only when the external sound is an abnormal sound, it is possible to eliminate waste of the photographing operation.

  In the surveillance camera of the present invention, it is preferable that the control means changes the shooting direction of the camera body in the direction of the abnormal sound generation position determined based on both results. In this way, it is possible to take a picture centering on the location where the abnormal sound is generated.

  In the surveillance camera of the present invention, the photographing lens of the camera body is configured to be able to change a focal length, and the control means is configured to capture the image based on information on an abnormal sound occurrence position determined based on both results. It is desirable to change the focal length of the lens. In this case, for example, it is possible to take an image with the imaging element in an enlarged state where the abnormal sound is generated, and it is possible to check and analyze the abnormal sound generation location in detail.

  The surveillance camera of the present invention is preferably configured such that the sound quality determination means determines that the external sound is an abnormal sound when a sound pressure level of a specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound. .

  Here, as the specific frequency, for example, a specific frequency appearing in a glass breaking sound, a person walking sound, or a door breaking sound can be considered. The sound quality determination means determines that the external sound is an abnormal sound when the sound pressure level of the specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound input to the sound input means. It is possible to reliably determine whether or not the sound is abnormal.

  In the surveillance camera of the present invention, the sound quality determination means determines that the external sound is an abnormal sound when a sound pressure level of a frequency other than a specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound. It may be a configuration.

  Here, as the specific frequency, for example, a frequency of a sound that is normally generated in daily life, such as a sound when a room illumination is switched on, can be considered. The sound quality determination means determines that the external sound is an abnormal sound when the sound pressure level of a frequency other than the specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound input to the sound input means. Therefore, the sound quality determination means can determine whether or not the external sound is an abnormal sound even if the specific frequency does not correspond to the abnormal sound.

  In the surveillance camera according to the aspect of the invention, the voice input unit includes a plurality of sound receiving units in which a plurality of microphones are arranged in different directions, and the position detection unit is a microphone selected from each sound receiving unit. It is desirable that the generation position of the external sound is detected based on the direction and position information.

  The plurality of microphones included in the sound receiving unit are arranged in different directions (directed in directions having strong directivities), and the voice input unit includes a plurality of such sound receiving units. If the position detecting means selects, for example, a microphone having the highest external sound input level from each sound receiving unit, the position of the external sound generated by the triangulation method based on the orientation and position information of each selected microphone. Can be specified.

  The monitoring system of the present invention includes the above-described monitoring camera of the present invention and a display device that displays an image captured by the image sensor transferred from the monitoring camera.

  According to the above configuration, it is possible to remotely monitor and manage a room to be monitored by installing a display device in a room or building different from the room where the monitoring camera is installed.

  The monitoring system according to the present invention preferably includes a recording unit that records an image captured by the image sensor of the monitoring camera. Since the monitoring system includes such a recording unit, it is possible to easily manage captured images.

  At this time, the recording unit may be provided inside the surveillance camera, or may be provided outside the surveillance camera (for example, a server interposed between the surveillance camera and the display device). In the latter case, the captured images can be centrally managed at a remote place.

  According to the present invention, the location where the abnormal sound is generated can be finely imaged by the imaging element of the camera body, and it is possible to avoid waste in the captured image. In addition, since the camera body is driven only when the external sound is an abnormal sound, it is possible to eliminate waste of the photographing operation.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 is an explanatory diagram showing the configuration of the monitoring system of the present invention. This monitoring system is configured such that a monitoring camera 1 and a monitor 2 are communicably connected via a server 3.

  The monitoring camera 1 monitors a monitoring target (for example, the inside of a room), and is composed of, for example, an eyeball camera. The surveillance camera 1 can capture still images and moving images, and is driven in either the normal mode or the power saving mode. Here, the normal mode is an operation mode in which continuous shooting is performed, and the power saving mode is an operation mode in which shooting is started only when shooting a still image for a still image, and only when abnormal sound occurs for a movie. It is. In the present embodiment, the discussion proceeds on the premise of driving in the power saving mode.

  The surveillance camera 1 has a camera body 1a provided with a later-described CCD 11 (see FIG. 1). The monitorable range of the camera body 1a is a range indicated by 1b in the figure. In the present embodiment, when abnormal sound (for example, glass breaking sound) occurs, the posture of the camera body 1a of the monitoring camera 1 changes from the position indicated by the broken line in the drawing to the position indicated by the solid line. The monitorable range 1b of the camera body 1a also changes from the range indicated by the broken line in the drawing to the range indicated by the solid line. As a result, the camera body 1 can shoot around the location where the abnormal sound is generated. The detailed configuration of the monitoring camera 1 will be described later.

  The monitor 2 is a display device that displays an image captured by the camera body 1a and transferred from the monitoring camera 1 via the server 3. For example, the monitor 2 has a place (room, room) different from the installation position (room) of the monitoring camera 1. Placed in the building). Thereby, the monitoring target of the monitoring camera 1 can be monitored remotely.

  The server 3 manages the image transferred from the monitoring camera 1 and controls transmission of the image to the monitor 2. In the present embodiment, the server 3 is provided with a memory 4 (recording unit) that records an image captured by the monitoring camera 1. That is, the memory 4 is provided outside the surveillance camera 1. As a result, the images recorded in the memory 4 can be centrally managed by the server 3 away from the monitoring camera 1. The memory 4 may be provided in the camera body 1a.

  Next, details of the monitoring camera 1 will be described. FIG. 1 is a block diagram showing a detailed configuration of the camera body 1a of the surveillance camera 1.

  The camera body 1 includes a CCD 11, a photographing lens 12, an audio input unit 13, a position detection unit 14, a sound quality determination unit 15, a control unit 16, and a transfer unit 17.

  The CCD 11 is an image sensor that captures an image of a monitoring target via the photographing lens 12. The photographic lens 12 is composed of a plurality of lenses that form an optical image to be monitored on the CCD 11, and is not shown under the control of the control unit 16 so that the focal length (field angle, magnification) changes. Driven by the drive unit. Thus, the photographing lens 12 is configured so that the focal length can be changed.

  The voice input unit 13 is a voice input unit that receives an input external sound. Here, FIG. 3 is a cross-sectional view showing a schematic configuration of the voice input unit 13. The voice input unit 13 includes a plurality of (for example, two) sound receiving units 21. Note that the sound receiving units 21 may be integrated as shown in FIG. 3 or may be separated from each other.

  Each sound receiving unit 21 has a plurality of (for example, five) ultra-small microphones 22. The microphones 22 are arranged side by side in the direction in which the sound receiving units 21 are arranged side by side. And in the same sound receiving part 21, each microphone 22 is arrange | positioned so that direction may mutually differ, ie, it may face in the direction from which directivity differs strongly.

  Here, the directivity of the microphone defines the sound field of the sound to be picked up, and the strong directivity microphone picks up only the sound in the direction in which the microphone is facing. A microphone that picks up a wide range of sounds regardless of the direction the microphone is facing.

  Among the microphones 22 of the sound receiving units 21, the two microphones 22 arranged on the outermost sides (the microphones 22 on the side opposite to the other sound receiving units 21) are arranged so that their directions are parallel to each other. Has been. On the other hand, the remaining microphones 22 are arranged so that their orientations approach the orientation of the outermost microphone 22 as they are located from the inside to the outside. Note that there may be two or more pairs of microphones 22 arranged so that their directions are parallel to each other.

  The position detection unit 14 is a position detection unit that detects the generation position (sound image localization point) of the external sound based on the audio signal of the external sound input to the audio input unit 13. More specifically, the position detection unit 14 selects one microphone 22 having the highest external sound input level in each sound receiving unit 21 of the audio input unit 13, and the direction of each selected microphone 21. Based on the position information of each microphone 21, the generation position of the external sound is specified by the existing triangulation method. That is, from the distance between the selected microphones 22 and 22 and the respective inclination angles of the microphones 22 and 22 with respect to the line connecting the microphones 22 and 22, the distance from the voice input unit 13 to the position where the external sound is generated The direction can be detected.

  If a very loud sound or a sound outside the measurement range is generated, and the input level difference cannot be detected from each microphone 22, the position detection unit 14 determines the direction of the two microphones 22 and 22 arranged in parallel to each other. Is detected as the direction of the external sound generation position.

  The sound quality determination unit 15 is sound quality determination means for determining whether or not the external sound is an abnormal sound based on the sound signal of the external sound input to the sound input unit 13. More specifically, the sound quality determination unit 15 determines that the external sound is an abnormal sound when the sound pressure level of the specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound input to the sound input unit 13. Is determined.

  Here, FIG. 4 is a graph showing an audio signal including a glass breaking sound. The horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (dB). As shown in FIG. 4, when the sound pressure level for each frequency in the audio signal is measured by frequency analysis such as FFT (Fast Fourier Transform) analysis and order analysis, 4 kHz in the case of a glass breaking sound. In the vicinity, there is a sound pressure level that is 6 dB or more higher than the environmental sound. Therefore, by setting 4 kHz as a specific frequency and comparing the sound pressure level of this specific frequency with a predetermined level (a level 6 dB higher than the environmental sound), it is determined whether or not glass sound is included in the audio signal. be able to.

  In addition to this, for example, if the frequency at which the sound pressure level is particularly high in the sound of a person walking or the sound of breaking a door is defined as the specific frequency, the sound pressure level of the specific frequency is obtained in the obtained external sound signal. By comparing the sound pressure level with the predetermined level, it can be determined whether or not the external sound is a walking sound or a door breaking sound.

  The specific frequency may be set in advance as a default, or may be set as appropriate by an input unit (not shown). Further, information regarding the specific frequency may be stored (registered) in a storage unit or a sound quality determination unit 15 (not shown).

  The control unit 16 controls the operation of each unit of the camera body 1a. In the present embodiment, the control unit 16 is based on both the determination result in the sound quality determination unit 15 and the detection result in the position detection unit 14, in particular. The control means for driving and controlling the camera body 1a is configured. For example, when the sound quality determination unit 15 determines that the external sound is an abnormal sound and the position detection unit 14 detects the generation position of the external sound, the generation position of the abnormal sound is specified based on both of these results. The In this case, the control unit 16 changes the focal length of the photographic lens 12 so that the shooting direction of the camera body 1a can be changed in the direction of the abnormal sound generation position or the abnormal sound generation position can be enlarged. To do.

  The transfer unit 17 is an output interface for transferring an image captured by the CCD 11 to the server 3 (see FIG. 2).

  Next, the operation of the surveillance camera 1 including the camera body 1a having the above configuration will be described mainly based on the flowchart of FIG.

  First, when an external sound is generated (step 1; hereinafter, “step” is simply abbreviated as S), the external sound is input to the voice input unit 13 (S2). Then, the position detection unit 14 selects one microphone 22 having the highest input level of the external sound from each sound receiving unit 21 of the voice input unit 13 one by one, and based on the orientation and position information of each selected microphone 21. The generation position of the external sound is specified by the above-described triangulation method (S3).

  In parallel with this, the sound quality determination unit 15 performs frequency analysis of the sound signal of the external sound input to the sound input unit 13, and measures the sound pressure level for each frequency (S4). Then, the sound quality determination unit 15 determines whether or not the sound pressure level of the specific frequency (for example, the frequency of the glass breaking sound) is equal to or higher than a predetermined level (for example, a level 6 dB higher than the environmental sound) in the audio signal ( S5). In S5, if the sound pressure level at the specific frequency is less than the predetermined level, the sound quality determination unit 15 determines that the generated external sound is not an abnormal sound, ends the process, and enters a standby state.

  On the other hand, if the sound pressure level at the specific frequency is equal to or higher than the predetermined level in S5, the sound quality determination unit 15 determines that the generated external sound is an abnormal sound. In this case, the control unit 16 recognizes the generation position of the external sound detected by the position detection unit 14 as the generation position of the abnormal sound, and changes the shooting direction of the camera body 1a in the direction of the generation position of the abnormal sound. (S6), the focal length of the taking lens 12 is changed so that the position where the abnormal sound is generated can be enlarged (S7). Then, the CCD 11 captures the position where the abnormal sound is generated (S8).

  The image photographed by the CCD 11 is transferred to the server 3 via the transfer unit 17 and the communication line, and is recorded in the memory 4 of the server 3 (S9). Thereafter, the image data is transmitted to the monitor 2 via the communication line, and the image is displayed there (S10).

  As described above, in the present embodiment, the control unit 16 of the monitoring camera 1 drives the camera body 1a based on both the determination result in the sound quality determination unit 15 and the detection result in the position detection unit 14 (for example, Since the direction of the camera body 1a is changed and the focal length of the photographic lens 12 is changed), the location where the abnormal sound is generated can be finely and focused on the CCD 11 of the camera body 1a. As a result, it is possible to reduce unnecessary inclusion of information in the captured image (information not related to the location where the abnormal sound is generated) as much as possible, thereby avoiding waste in the captured image and high accuracy. A high-quality image can be obtained. Moreover, since the camera body 1a is driven only when the external sound is abnormal, it is possible to eliminate waste of the photographing operation.

  In the above description, the example in which the voice input unit 13 is configured by integrating the two sound receiving units 21 and 21 as they are has been described. However, the configuration of the voice input unit 13 is not limited to this.

  For example, FIG. 6 is a plan view showing another configuration of the audio input unit 13 viewed from the optical axis direction of the photographing lens 12. The voice input unit 13 includes four sound receiving units 21 and is disposed around the photographing lens 12. More specifically, each sound receiving unit 21 is arranged around the photographing lens 12 so that a plurality of (for example, five) microphones 22 arranged in each sound receiving unit 21 are arranged in the radial direction of the photographing lens 12. In addition, they are arranged at equal intervals in the circumferential direction of the photographic lens 12. At this time, in each sound receiving unit 21, the outermost microphones 22 (the microphones 22 on the side opposite to the photographing lens 12) are parallel to each other (so that the directions of the four microphones 22 are the same). Has been placed. On the other hand, the remaining microphones 22 are arranged so that the direction thereof approaches the direction of the outermost microphone 22 as it is positioned from the inner side (photographing lens 12 side) to the outer side.

  According to this configuration, on the basis of the audio signals input to the microphones 22 of the two sound receiving units 21 that are arranged to face each other via the photographing lens 12, the generation position of the external sound is set to each of the two sound receiving units 21. It is specified two-dimensionally in a plane including the microphone 22. On the other hand, also based on the audio signal input to the microphones 22 of the remaining two sound receiving units 21 that are opposed to each other via the photographing lens 12, the position where the external sound is generated is similar to the above. It is specified two-dimensionally in a plane including 21 microphones 22. Therefore, by combining these results, the external sound generation position can be specified three-dimensionally, and the external sound generation position can be grasped more accurately.

  In the above description, the case where the specific frequency used when determining the sound quality of the external sound is a frequency corresponding to the abnormal sound has been described. However, the specific frequency does not necessarily correspond to the abnormal sound. For example, as the specific frequency, a frequency of a sound that is normally generated in daily life, such as a sound when a room illumination is switched on, may be considered. In this case, the sound quality determination unit 15 determines that the external sound is an abnormal sound when the sound pressure level of a frequency other than the specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound input to the sound input unit 13. Can be determined. Even in this case, it is still possible to determine whether or not the external sound is an abnormal sound. That is, even if the specific frequency does not correspond to the abnormal sound, it can be determined whether or not the external sound is an abnormal sound.

  The distance measurement by the position detection unit 14 may be a triangular distance measurement using an ultrasonic wave or a distance measurement using an active method. For example, when the sound signal of the external sound output from the sound input unit 13 is insufficient for distance measurement, the position detection unit 14 may perform distance measurement using ultrasonic waves. In addition, if distance measurement is impossible due to some cause, the control unit 16 may drive the photographing lens 12 so as to obtain a preset focus position and angle of view.

  In addition, you may make it delete suitably the unnecessary thing among the images recorded on the memory 4 in S9. By changing the recording state of the memory 4 in this way, it is possible to eliminate wasted recorded images.

  The surveillance camera of the present invention can also be expressed as follows.

  The surveillance camera of the present invention includes an imaging device (CCD 11) for imaging a monitoring target, audio input means (audio input unit 13) to which external sound is input, and the external sound having a specific frequency or other than a specific frequency. Sound quality determining means for determining that the external sound is abnormal sound, and for adjusting the angle of view of the image sensor when the external sound is abnormal sound ( And a control unit 16).

  The surveillance camera according to the present invention is further detected by a position detection unit (position detection unit 14) for detecting a direction and measuring a distance based on a phase shift of an audio signal output from the audio input unit, and the position detection unit. The image forming apparatus includes a control unit (control unit 16) that adjusts the shooting direction and the angle of view by the image sensor based on the direction information and the distance measurement information.

  The surveillance camera of the present invention further includes a recording unit that records an image picked up by the image pickup device when the external sound is an abnormal sound.

  The surveillance camera of the present invention further has a transmission means (transfer unit 17) for transmitting the image data to the outside.

  In the surveillance camera of the present invention, the sound quality determination means is configured to determine whether or not the external sound includes a sound of a specific frequency or a sound other than the specific frequency by frequency analysis using FFT.

  In the surveillance camera of the present invention, the sound quality determining means is configured to determine whether or not the external sound includes a sound of a specific frequency or a sound other than the specific frequency by frequency analysis by order analysis.

  The surveillance camera according to the present invention further includes a control unit (control unit 16) that performs control to start photographing with the image sensor only when the external sound is an abnormal sound.

  The surveillance camera according to the present invention further includes a control unit (control unit 16) that performs control to start photographing by the image sensor when a sound having a preset specific frequency is generated.

  The surveillance camera according to the present invention further includes a control unit (control unit 16) that performs control to start photographing by the imaging device when sound having a specific frequency set arbitrarily is generated. is there.

It is a block diagram which shows the detailed structure of the camera main body of the surveillance camera in the surveillance system which concerns on one Embodiment of this invention. It is explanatory drawing which shows the structure of the said monitoring system. It is sectional drawing which shows the structure of the outline of the audio | voice input part of the said monitoring camera. It is a graph which shows the audio | voice signal containing the destruction sound of glass. It is a flowchart which shows the flow of operation | movement in the said monitoring system. It is a top view which shows the other structure of the said audio | voice input part.

Explanation of symbols

1 surveillance camera 1a camera body 2 monitor (display device)
4 Memory (Recording means)
11 CCD (imaging device)
12 Photographing lens 13 Voice input unit (voice input means)
14 Position detection unit (position detection means)
15 Sound quality determination unit (sound quality determination means)
16 Control unit (control means)
21 Sound receiver 22 Microphone

Claims (9)

Voice input means for inputting external sound;
Sound quality determination means for determining whether or not the external sound is an abnormal sound based on a sound signal of the external sound input to the sound input means;
Position detecting means for detecting a position where the external sound is generated based on a sound signal of the external sound input to the sound input means;
A camera body having an image sensor;
Control means for driving and controlling the camera body,
A monitoring camera, wherein the control means drives the camera body based on both the determination result by the sound quality determination means and the detection result by the position detection means.   The surveillance camera according to claim 1, wherein the control unit changes a shooting direction of the camera body in a direction of an abnormal sound generation position determined based on both the results. The photographic lens of the camera body is configured so that the focal length can be changed.
The surveillance camera according to claim 1, wherein the control unit changes a focal length of the photographing lens based on information on an abnormal sound generation position determined based on both the results.   The sound quality determination means determines that the external sound is an abnormal sound when a sound pressure level of a specific frequency is equal to or higher than a predetermined level in the sound signal of the external sound. Surveillance camera in any one of.   The sound quality determination means determines that the external sound is an abnormal sound when a sound pressure level of a frequency other than a specific frequency is equal to or higher than a predetermined level in the audio signal of the external sound. The surveillance camera according to any one of 1 to 3. The voice input means has a plurality of sound receiving units in which a plurality of microphones are arranged in different directions,
The monitoring according to any one of claims 1 to 5, wherein the position detecting means detects the generation position of the external sound based on the direction and position information of a microphone selected from each sound receiving unit. camera. A surveillance camera according to any one of claims 1 to 6;
A monitoring system comprising: a display device that displays an image captured by the image sensor transferred from the monitoring camera.   The monitoring system according to claim 7, further comprising recording means for recording an image captured by the image sensor of the monitoring camera.   The monitoring system according to claim 8, wherein the recording unit is provided outside the monitoring camera.

Images