JP2006186739A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable monitoring with respect to a past non-communicable period afterwards, even if the period incapable of performing remote monitoring is produced because of defective communication. <P>SOLUTION: A surveillance camera 100 is equipped with a camera head 120, a radio communication portion 105 for performing radio communication between itself and a server 130, a communication control unit for allowing the radio communication section 105 to transmit image data outputted by the camera head 120 to the server 130, a defective communication decision portion for monitoring the state of communication with the server 130, and a flash memory 107 for storing image data and defective-time information representing a state during the defective communication according to detection of the defect by the defective communication decision. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging apparatus, and more particularly to an imaging apparatus used in a monitoring system.

  A network camera that includes a monitoring camera for photographing a monitoring area and a server installed at a position away from the monitoring camera, and browses an image obtained by photographing the monitoring area on the server has become widespread. If an image captured by the monitoring camera is transmitted to the server by wireless communication, wiring is not required and installation is easy. However, since the communication medium is a radio wave, the communication itself is interrupted when the radio wave is disturbed.

  In Japanese Patent Laid-Open No. 2000-175092, an imaging unit that captures an image of a subject and obtains a captured image, an operation unit that instructs a predetermined operation, and an imaging unit that communicates with a transmission destination and obtains the imaging function. A communication unit that transmits an image to the transmission destination; and a control unit that starts each operation of the imaging unit and the communication unit when a predetermined operation is instructed by the operation unit. The means further comprises a storage means for performing wireless communication and storing a captured image obtained by the imaging function, and the communication means includes a detection means for detecting a communication state with the transmission destination, and the control means Describes a communication device that temporarily stores the captured image in the storage unit based on the detection result of the detection unit.

  However, the communication device described in Japanese Patent Application Laid-Open No. 2000-175092 stores an image to be transmitted when communication is not possible, so that the subsequent shooting can be continued smoothly. It cannot be detected. For this reason, even if there is an intruder, it cannot be detected.

An intruder may turn off the power to disable the surveillance camera in order to avoid being taken by the surveillance camera. In the communication device described in Japanese Patent Application Laid-Open No. 2000-175092, when the power is turned off, the image cannot be captured.
JP 2000-175092 A

  The present invention has been made to solve the above-described problems, and one of the objects of the present invention is that even if a period during which remote monitoring cannot be performed due to a communication abnormality occurs, a period during which communication could not be performed thereafter. An imaging device capable of monitoring is provided.

  Another object of the present invention is to provide an imaging apparatus capable of confirming an image immediately after that even when an external power supply is shut off.

  In order to achieve the above object, according to an aspect of the present invention, an imaging apparatus includes: an imaging unit; a wireless communication unit that wirelessly communicates with a server; and image data output to the wireless communication unit by the imaging unit. Is transmitted to the server, the communication state monitoring unit for monitoring the communication state with the server, and when the abnormality is detected by the communication state monitoring unit, the image data and the abnormal time indicating the abnormal state And an abnormal time information storage means for storing information.

  According to this invention, the state of communication with the server is monitored, and in response to the detection of an abnormality, image data output by the imaging means and abnormal time information indicating the abnormal state are stored. . For this reason, it is possible to later confirm the image taken while the communication abnormality with the server continues and the state at the time of the abnormality. As a result, even when a period during which remote monitoring cannot be performed due to a communication abnormality occurs, an imaging apparatus capable of monitoring the period during which communication could not be performed later can be provided.

  Preferably, the abnormal time information storage means stores in a nonvolatile memory.

  Preferably, the imaging means includes an angle of view changing means for changing the angle of view, and an imaging control means for controlling the angle of view changing means to change the angle of view of the imaging means when an abnormality is detected by the monitoring means. Further prepare.

  According to the present invention, the entire range that can be imaged by the imaging means can be imaged and stored.

  Preferably, the imaging control unit changes the imaging unit to a predetermined angle of view.

  If an imaging area determined by a predetermined angle of view is set near the entrance or near the power source, the intruder can be imaged with high probability.

  Preferably, the imaging control unit changes the imaging unit to a plurality of predetermined angles of view. By imaging a plurality of imaging regions, an intruder can be imaged with a higher probability.

  Preferably, the imaging unit includes an imaging magnification changing unit that changes the imaging magnification, and an imaging control unit that controls the imaging magnification changing unit to change the imaging magnification of the imaging unit when an abnormality is detected by the monitoring unit. Further prepare.

  Preferably, the apparatus further includes an external power source to which power is supplied from the outside, a backup power source, and a power shut-off detecting unit for detecting that the power supply from the external power source has been shut off, In response to detecting that the power supply has been cut off by the detection means, the image data and the abnormal time information indicating the abnormal state are stored in the nonvolatile memory.

  According to the present invention, even if the power supply from the external power supply is interrupted, the power is supplied by the backup power supply, so that the imaging by the imaging means is continued. And since the image data and abnormality information captured during that time are stored in a non-volatile memory, the image was taken immediately after the power supply from the external power supply was cut off even after the power of the backup power supply was consumed. The image and the abnormality information can be read later. For this reason, even when the external power supply is shut off, it is possible to provide an imaging apparatus that can confirm the image immediately after that.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a diagram showing a schematic configuration of a monitoring system according to one embodiment of the present invention. Referring to FIG. 1, monitoring system 1 includes a monitoring camera 100, an access point 131, and a server 130. Although one monitoring camera 100 is illustrated in the figure, the monitoring camera 100 may be one or a plurality.

  The surveillance camera 100 includes a camera head 120 and a control box 101. Server 130 is connected to access point 131. Wireless communication is performed between the control box 101 of the monitoring camera 100 and the access point 131. For this reason, in the monitoring system 1 according to the present embodiment, the monitoring camera 100 can be controlled from the server 130, and an image captured by the monitoring camera 100 is received by the server 130. For this reason, a person who operates the server 130 can remotely control the surveillance camera 100 to view an image of a desired area on the server 130.

  The surveillance camera 100 is controlled in accordance with an instruction from the server 130, but can be driven independently. The self-sustained drive does not require an instruction from the server 130, and includes storing image data obtained by photographing and changing a photographing area.

  The camera head 120 receives a lens 123, a CMOS (Complementary Metal Oxide Semiconductor) sensor that receives light transmitted through the lens 123 and outputs image data, and a lens 123 for changing the photographing direction to a horizontal direction and a vertical direction. A pan / tilt driving mechanism 121, a zoom driving mechanism 122 for adjusting the photographing magnification of the lens 123, and an LED 124 for displaying an abnormal state are included. A CCD (Charge Coupled Devices) sensor may be used instead of the CMOS sensor.

  The control box 101 stores the captured image, a system control unit 102 for controlling the entire surveillance camera 100, an image input unit 103 for capturing an image output from the CMOS sensor of the camera head 120, and the like. An image storage unit 104, a PTZ (Pan-Tilt-Zoom) interface 106 for connecting the control box to the camera head, a wireless communication unit 105, a flash memory (Electronically Erasable and Programmable Read Only Memory) 107, And a large-capacitance capacitor 108 serving as a backup power source.

  The image input unit 103 receives image data output from the CMOS sensor of the camera head 120. The input image data is stored in the image storage unit 104. At this time, a still image or a moving image is input from the CMOS sensor, but it may be compressed and encoded and stored in the image storage unit 104.

  The image storage unit 104 stores image data received from the image input unit 103. For example, an SDRAM (Synchronous Dynamic Random Access Memory) can be used. The image storage unit 104 is a ring buffer. When a moving image input by the image input unit 103 is recorded, the image storage unit 104 receives an image received by the image input unit 103 and an image in the past that is traced back from the image for a predetermined period. An image received from the input unit 103 can be recorded.

  The wireless communication unit 105 wirelessly communicates with the access point 131 and transmits / receives data. For example, communication according to the IEEE 802.11b standard is performed. The wireless communication unit 105 may be either communication using electromagnetic waves or communication using light as long as it is wireless communication.

  The diode 109 has an anode connected to the external power supply 110 and a cathode connected to one end of the large-capacitance capacitor 108. For this reason, when power is supplied from the external power supply 110, power supplied from the external power supply 110 is input to the control box 101. On the other hand, when power from the external power supply 110 is not supplied, the power stored in the large-capacitance capacitor 108 is supplied. Therefore, the large-capacitance capacitor 108 functions as a power source for backing up the external power source 110. If a large-capacity capacitor 108 is used as a backup power source, it is cheaper than a secondary battery in terms of production cost. However, a primary battery or a secondary battery may be used as necessary.

  The flash memory 107 is a nonvolatile memory. As long as it is a non-volatile memory, another semiconductor memory such as an EEPROM (Electronically Erasable and Programmable Read Only Memory) or a memory such as a magnetic disk or an optical disk may be used.

  The system control unit 102 controls the pan / tilt driving mechanism 121 and the zoom driving mechanism 122 of the camera head 120 to change the shooting direction and the shooting magnification of the lens 123. Also, the image data recorded in the image storage unit 104 is read out in the order of recording and output to the wireless communication unit 105. For this reason, in the monitoring system in the present embodiment, image data captured and output by the monitoring camera 100 is transmitted to the server 130. For this reason, even if the server 130 is away from the place where the monitoring camera 100 is installed, an image of the place can be viewed on the display provided in the server 130. Although an example in which an image captured by a surveillance camera is transmitted is shown here, a microphone that converts sound into electronic data may be provided, and sound data output from the microphone may be transmitted to the server 130.

  In the monitoring system 1 in the present embodiment, it is assumed that the monitoring camera 100 is installed at a position away from the server 130. For this reason, wireless is used for communication between the monitoring camera 100 and the server. As an obstruction to avoid an intruder taking a picture with the surveillance camera 100, an act of obstructing wireless communication using a device that outputs jamming radio waves (hereinafter referred to as “communication obstruction”) or the surveillance camera 100 An act of shutting off from an external power source (hereinafter referred to as “power shutoff act”) is expected.

  When the communication disturbing action or the power shutoff action is detected, the system control unit 102 displays that the communication disturbing action or the power shutoff act has occurred by changing the display mode of the LED 124. Changes in the display mode of the LED 124 include changes from turning off to turning on, turning on and blinking, and blinking intervals. By changing the display mode of the LED, it is possible to confirm that there has been a communication blocking action or a power-off action simply by looking at the monitoring camera 100.

  FIG. 2 is a diagram for explaining an expected disturbing action. FIG. 2A is a diagram for explaining a communication disturbing action. As described above, wireless communication is performed between the monitoring camera 100 and the access point 131. If the transmitter 201 that outputs jamming radio waves including the frequency band used in the wireless communication is used, the surveillance camera 100 and the access point 131 cannot communicate normally. Therefore, the server 130 does not receive image data that is captured and transmitted by the monitoring camera 100.

  The surveillance camera 100 according to the present embodiment stores image data acquired by photographing in the flash memory 107 in response to the communication interference act.

  FIG. 2B is a diagram for explaining a power-off action. As described above, the monitoring camera 100 is supplied with power from the external power supply 110. For this reason, the disturber tries to disable the monitoring camera 100 by cutting the power cable connecting the external power source 110 and the monitoring camera 100.

  The surveillance camera 100 according to the present embodiment includes a large-capacity capacitor 108 as a backup power source in response to the power shut-off action, and continuously operates for a predetermined time after the power supply from the external power source 110 is shut off. Is possible.

  FIG. 3 is a functional block diagram illustrating an outline of functions of the system control unit. Referring to FIG. 3, system control unit 102 includes power cut-off determination unit 151, communication control unit 152 for controlling data transmission / reception of wireless communication unit 105, communication abnormality determination unit 153, and pan / tilt control. Unit 154, zoom control unit 155, and abnormality information storage unit 156.

  The communication control unit 152 is connected to the wireless communication unit 105 and controls data transmission / reception of the wireless communication unit 105. Specifically, the communication control unit 152 outputs an image data transmission request signal to the wireless communication unit 105. When receiving the transmission request signal, the wireless communication unit 105 reads the image data from the image storage unit 104 according to the request signal, and transmits the image data to the access point 131 wirelessly. When wireless communication unit 105 receives a reception signal indicating that data has been normally received from access point 131, wireless communication unit 105 outputs a transmission completion signal to communication control unit 152.

  The communication abnormality determination unit 153 determines whether or not the communication state between the wireless communication unit 105 and the access point 131 is abnormal. Specifically, the communication abnormality determination unit 153 compares the time from when the communication control unit 152 outputs the transmission request signal to when the transmission completion signal is input with a predetermined interference determination time. If the time exceeds the interference determination time, it is determined that communication is interrupted due to radio wave interference. Then, the abnormal signal is output to the pan / tilt control unit 154, the zoom control unit 155, and the abnormal time information storage unit 156.

  The voltage of the external power supply 110 is input to the power cutoff judgment unit 151. The power shutoff determination unit 151 determines whether or not the power supply from the external power supply 110 has been interrupted. Specifically, it is determined whether or not the voltage of the external power supply 110 has decreased below a predetermined value. When it is determined that the power supply from the external power supply 110 has been interrupted, the power shut-off determination unit 151 outputs an abnormal signal to the pan / tilt control unit 154, the zoom control unit 155, and the abnormal time information storage unit 156.

  When an instruction is received from the server 130 via the wireless communication unit 105, the pan / tilt control unit 154 outputs a control signal for controlling the pan / tilt driving mechanism 121 to the PTZ interface according to the instruction. When an instruction is received from the server 130 via the wireless communication unit 105, the zoom control unit 155 outputs a control signal for controlling the zoom driving mechanism 122 to the PTZ interface according to the instruction.

  The pan / tilt control unit 154 stores the shooting direction of the lens 123 in the flash memory 107 in advance when a signal instructing the normal shooting mode is input from the server 130 via the wireless communication unit 105. A control signal for controlling the pan / tilt drive mechanism 121 is output to the PTZ interface so as to form a pattern. When the zoom control unit 155 receives a signal instructing the normal shooting mode from the server 130 via the wireless communication unit 105, the zoom magnification of the lens 123 becomes a pattern stored in the flash memory 107 in advance. In addition, a control signal for controlling the zoom drive mechanism 122 is output to the PTZ interface.

  Further, the pan / tilt control unit 154 and the zoom control unit 155, when an abnormal signal is input from the power interruption determination unit 151 or the communication abnormality determination unit 153, executes processing at the time of occurrence of interference. When an abnormal signal is input, the pan / tilt control unit 154 performs pan / tilt so that the shooting direction of the lens 123 becomes a special shooting direction stored in advance in the flash memory 107 for processing at the time of occurrence of the disturbance. A control signal for controlling the drive mechanism 121 is output to the PTZ interface. The special shooting direction stored in advance for processing at the time of occurrence of interference includes the following shooting direction.

  (1) Direction of the entrance / exit of the monitoring area of the monitoring camera 100. For example, doors, windows, ventilation openings.

  (2) The direction of the area where the power cable connecting the external power source 110 of the monitoring camera 100 and the control box 101 is laid.

  (3) Predetermined predetermined area among 100 monitoring areas of the monitoring camera. Locations where objects to be monitored are placed.

  (4) When an intruder is detected by detecting a moving object from an image captured by the monitoring camera 100 and a tracking process for tracking the intruder (moving object) is executed, the tracking process is set. Shooting direction.

  (5) A direction in which the entire monitoring area is imaged. If the entire monitoring area can be imaged in one direction, that direction. If the entire monitoring area can be imaged by combining multiple directions, these multiple directions are used.

  When an abnormal signal is input, the zoom control unit 155 controls the zoom drive mechanism 122 so that the zoom magnification of the lens 123 becomes a special zoom magnification stored in advance in the flash memory 107 for processing at the time of occurrence of the disturbance. A control signal to be controlled is output to the PTZ interface.

  The special zoom magnification stored in advance for processing at the time of occurrence of interference includes the following zoom magnification.

  (1) The smallest magnification is set. Thereby, the image which imaged the monitoring area | region in the wide range can be obtained. This is effective when executing a process of detecting a moving object as an intruder.

  (2) When the tracking process is executed, a zoom magnification suitable for the tracking process. For example, it is determined by the proportion of the moving object in the image.

  When an abnormality signal is input from the power interruption determination unit 151 or the communication abnormality determination unit 153, the abnormality information storage unit 156 stores abnormality information in the flash memory 107. The abnormality information includes an abnormality type, date and time, and photographing information. The abnormality type indicates the cause of occurrence of the abnormality, and here indicates whether it is a communication abnormality or a power shutdown abnormality.

  When an abnormality signal is input from the power interruption determination unit 151, the abnormality information storage unit 156 stores an abnormality type of the power interruption abnormality indicating an abnormality caused by the power interruption, and an abnormality signal is input from the communication abnormality determination unit 153. Then, the abnormality type of the communication abnormality indicating the communication abnormality is stored. Further, the abnormality type may be recorded as a flag. For example, a 1-bit area of a communication error flag that is “1” when communication is abnormal and “0” when communication is not abnormal, and “1” when power supply is abnormal and “0” when power is not abnormal. A 1-bit area of the power shutdown abnormality flag is secured in the flash memory 107. The abnormal time information storage unit 156 rewrites the communication abnormality flag area of the flash memory 107 to “1” in the case of a communication abnormality, and sets the power interruption abnormality flag area of the flash memory 107 to “1” in the case of a power interruption abnormality. rewrite.

  The date and time of abnormality information is the date and time when the abnormality information storage unit 156 receives an abnormality signal from the power interruption determination unit 151 or the communication abnormality determination unit 153. The imaging information of the abnormality information includes a pan angle and a tilt angle indicating the imaging direction of the lens 123, a zoom magnification, and an AE condition.

  Further, the abnormal time information storage unit 156 is a pan / tilt control unit 154 and a zoom control unit 155 that the camera head 120 captures under the pan angle and tilt angle determined by the abnormal information shooting information, the zoom magnification, and the AE conditions. The image data to be output is stored in the flash memory 107. At this time, the image data, the date and time, and the shooting conditions are stored in association with each other.

  Further, the abnormal time information storage unit 156 may read and store past image data stored in the image storage unit 104 before an abnormal signal is input. Here, the image data to be stored is a still image, but it may be a moving image. Even when image data is stored as a moving image, the time at which the frame was captured and the imaging information may be stored in association with frames at a predetermined interval. Further, when storing the image data in the flash memory 107, it is preferable to store the image data by compression encoding in order to reduce the data amount.

<Modification of communication abnormality determination unit>
The communication abnormality determination unit 153 described above compares the time from when the communication control unit 152 outputs the transmission request signal to when the transmission completion signal is input with a predetermined interference determination time, thereby determining the wireless communication unit Whether or not the communication state between the access point 105 and the access point 131 is abnormal is determined. Apart from or in addition to this determination, an abnormality in the frequency band of the received radio wave may be detected. FIG. 4A shows a frequency distribution of communication waves. FIG. 4B is a diagram showing the frequency distribution of the disturbing wave. The interference wave is received by the wireless communication unit 105 in the interference occurrence state. The jamming wave has a stronger intensity in a wider frequency band than the communication wave. For this reason, the frequency distribution of the radio wave received by the wireless communication unit 105 is analyzed, and it is determined that the communication is abnormal when the frequency band is wider than the frequency band of the communication wave.

  FIG. 5 is a flowchart showing a flow of processing at the time of occurrence of the disturbance executed by the surveillance camera in the present embodiment. Referring to FIG. 5, monitoring camera 100 determines whether either a power interruption abnormality in which power supply from external power supply 110 is interrupted or a communication abnormality in which wireless communication by wireless communication unit 105 becomes abnormal has occurred. Is determined (step S01). If any one of the power interruption abnormality and the communication abnormality is detected, the process proceeds to step S02, and if neither is detected, the process proceeds to step S10 in order to continue the operation in the normal photographing mode. That is, the process at the time of occurrence of interference is a process that is executed on the condition that either a power interruption abnormality or a communication abnormality is detected during operation in the normal photographing mode.

  In step S02, the abnormality type is stored in the flash memory 107. Specifically, it is performed by rewriting a flag in a predetermined area of the flash memory.

  Then, the date and time at that time is stored in the flash memory 107 (step S03). Further, the shooting parameters set in the camera head 120 at that time are changed (step S04). The imaging parameter may be a parameter predetermined for processing at the time of occurrence of interference. The shooting parameters include pan angle, tilt angle, zoom magnification, and AE conditions.

  Then, the angle of view (photographing direction) of the lens 123 is changed so that the pan angle and tilt angle set by controlling the pan / tilt drive mechanism 121 (step S05). Further, the zoom magnification of the lens 123 is changed so that the zoom magnification set by controlling the zoom drive mechanism 122 is obtained (step S06).

  Then, the image data output by the camera head 120 is stored in the flash memory 107 (step S07). Further, the shooting parameters changed in step S04 are stored in the flash memory 107 in association with the image data stored in step S07 (step S08).

  Next, it is determined whether or not shooting has been completed (step S09). If it is determined that the process has been completed, the process proceeds to step S10; otherwise, the process returns to step S04. The end of shooting is determined based on whether there is a shooting parameter to be changed. Shooting parameters are stored in the flash memory 107 in advance. When the process proceeds from step S09 to step S10, all shooting parameters stored in the flash memory 107 are set in step S04, and image data shot with the shooting parameters is stored in the flash memory 107 in step S07. become.

  In step S10, the normal shooting mode is set. If any one of the power interruption abnormality and the communication abnormality is detected in step S01, the processing of step S02 to step S09 is executed, so that the normal photographing mode is returned in step S10. If the camera is already in the normal shooting mode, the process proceeds to the next step S11 without doing anything. In the normal shooting mode, shooting of the monitoring area by the camera head 120 and transmission of image data obtained by shooting to the server 130 are executed.

  In step S <b> 11, it is determined whether a transmission request for image data stored in the flash memory 107 is received from the server 130. If such a request is received, the process proceeds to step S12, and if not, the process returns to step S01. In step S 12, the abnormality type and image data stored in the flash memory 107 and the shooting parameters stored in association therewith are transmitted to the server 130.

  Here, the transmission is made when there is a transmission request from the server 130. However, when no communication abnormality is detected, it may be automatically transmitted from the monitoring camera 100 to the server 130. .

  Note that, in the case of a power interruption abnormality in which the power supply from the external power supply is interrupted, the power from the large-capacitance capacitor 108 is supplied. Since the power storage capacity of the large-capacity capacitor 108 is limited, the monitoring camera 100 stops operating when the power stored in the large-capacity capacitor 108 is consumed unless power is supplied from the external power source 110. Even in this case, since the flash memory 107 is a non-volatile memory, the imaging parameters and the image data stored in the flash memory 107 can be read by supplying power from the external power supply 110 thereafter. When the power supply from the external power supply is restored, step S12 is executed to transmit the abnormality type and image data stored in the flash memory 107 and the shooting parameters stored in association with the abnormality type to the server 130. Also good.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows schematic structure of the monitoring system in one of embodiment of this invention. It is a figure for demonstrating the anticipated obstruction act. It is a functional block diagram which shows the outline of the function of a system control part. It is a figure which shows the frequency distribution of a communication wave and an interference wave. It is a flowchart which shows the flow of the process at the time of the disturbance generation performed with the surveillance camera in this Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Surveillance system, 12 Zoom drive mechanism, 100 Surveillance camera, 101 Control box, 102 System control part, 103 Image input part, 104 Image storage part, 105 Wireless communication part, 106 Interface, 107 Flash memory, 108 Large capacity capacitor, 109 Diode, 110 External power supply, 120 Camera head, 121 Pan / tilt drive mechanism, 122 Zoom drive mechanism, 123 Lens, 130 Server, 131 Access point, 151 Power interruption determination unit, 152 Communication control unit, 153 Communication abnormality determination unit, 154 Pan / tilt control unit, 155 zoom control unit, 156 abnormal information storage unit, 201 transmitter.

Claims (7)

Imaging means;
Wireless communication means for wireless communication with the server;
Transmission means for causing the wireless communication means to transmit image data output by the imaging means to a server;
Communication state monitoring means for monitoring a communication state with the server;
An imaging apparatus comprising: an abnormality time information storage unit that stores the image data and abnormality time information indicating a state at the time of abnormality in response to the abnormality being detected by the communication state monitoring unit.   The imaging apparatus according to claim 1, wherein the abnormal time information storage unit is stored in a nonvolatile memory. The imaging means includes an angle of view changing means for changing the angle of view,
The imaging apparatus according to claim 1, further comprising an imaging control unit that controls the angle-of-view changing unit to change the angle of view of the imaging unit when an abnormality is detected by the monitoring unit.   The imaging apparatus according to claim 3, wherein the imaging control unit changes the imaging unit to a predetermined angle of view.   The imaging apparatus according to claim 3, wherein the imaging control unit changes the imaging unit to a plurality of predetermined angles of view. The imaging means includes imaging magnification changing means for changing the imaging magnification,
The imaging apparatus according to claim 1, further comprising: an imaging control unit that controls the imaging magnification changing unit to change an imaging magnification of the imaging unit when an abnormality is detected by the monitoring unit. An external power source to which power is supplied from the outside;
Backup power supply,
A power cutoff detection means for detecting that the power supply from the external power source is cut off,
The abnormal-time information storage means stores the image data and abnormal-time information indicating an abnormal-time information in a non-volatile memory in response to detecting that the power supply has been cut off by the power-off detection means. The imaging device according to claim 1, stored in

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