Surveillance system and surveillance device

Abstract

The present invention provides a surveillance system and a surveillance device capable of performing necessary surveillance while ensuring privacy. The surveillance device system includes: a frame provided in a building; a door (37) that can be opened and closed relative to the frame; a photographing unit (17) embedded inside the frame and performing photography using a lens (25) from an opening provided in the frame; an opening / closing sensor (18) that detects the opening and closing of the door (37); a control unit that controls the photographing unit (17); and a shielding mechanism (40). The control unit causes the photographing unit (17) to start photography when it detects an opening change of the door (37) from closed to open using the opening / closing sensor (18), and causes the photographing unit (17) to end photography when it detects a closing change of the door (37) from open to closed. The shielding mechanism (40) shields the lens (25) when the door (37) is in a closed state.

Description

Technical Field

[0001] The present invention relates to a monitoring system and a monitoring device. Background Art

[0002] Patent Document 1 discloses a monitoring device that makes it difficult for a care receiver to see a camera. In this monitoring device, a plurality of polarizing plates are stacked on the front surface of the camera to set the transmittance of visible light to 25% or less.

[0003] Patent Document 2 shows a surveillance camera system that does not cause a time when the door of a closed space is opened. This surveillance camera system sets the brightness control parameters of a second surveillance camera installed outside the closed space to a first surveillance camera installed in the closed space when the door of the closed space is about to be opened. In addition, this surveillance camera system predetermines the correspondence between the date, time, location, weather and the brightness control parameter by using a lookup table, and sets the brightness control parameter of the first surveillance camera according to the lookup table when the door of the closed space is about to be opened.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2019-45556

[0005] Patent Document 2: Japanese Patent No. 6664545

[0006] In facilities such as hotels or rental conference rooms, it is sometimes desirable to install surveillance cameras indoors from the perspective of theft prevention. For example, in a hotel, by installing surveillance cameras indoors, it is possible to record disputes between staff and users. On the other hand, from the perspective of privacy, users of such facilities often do not want surveillance cameras to be installed indoors. Therefore, for example, it is considered to install surveillance cameras in passages or other places where entrances and exits to each room are provided. However, surveillance cameras installed in passages or other places may not be able to fully record disputes between staff and users such as the above. Summary of the invention

[0007] The present invention has been made in view of such circumstances, and one of its objects is to provide a monitoring system and a monitoring device that can perform necessary monitoring while ensuring privacy.

[0008] The monitoring device system of the present invention comprises: a frame installed in a building; an opening and closing body installed in the frame and capable of opening and closing relative to the frame; a photographing unit embedded in the frame and photographing from an opening portion provided in the frame using a lens; an opening and closing sensor detecting the opening and closing of the opening and closing body; a control unit controlling the photographing unit; and a shielding mechanism. The control unit starts photographing when the opening and closing sensor detects that the opening and closing body changes from closed to open, and stops photographing when the opening and closing sensor detects that the opening and closing body changes from open to closed, and the shielding mechanism shields the lens of the photographing unit when the opening and closing body is closed.

[0009] The monitoring device of the present invention is a monitoring device for being set on a frame on which an opening and closing body is installed, wherein the monitoring device has an opening and closing sensor, a control unit, and a photographing unit embedded in the frame for use. The photographing unit uses a lens to take a photograph from an opening portion set in the frame. The opening and closing sensor detects the opening and closing of the opening and closing body. The control unit causes the photographing unit to start photographing when the opening and closing sensor detects an opening change of the opening and closing body from closed to open, and causes the photographing unit to end photographing when the opening and closing sensor detects a closing change of the opening and closing body from open to closed.

[0010] According to the present invention, necessary monitoring can be performed while ensuring privacy. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1A This is a perspective view showing an example of the external appearance of the monitoring system according to Embodiment 1 of the present invention.

[0012] Figure 1B This is a perspective view showing an example of the external appearance of the monitoring system according to Embodiment 1 of the present invention.

[0013] Figure 2 It is a block diagram showing a configuration example of the monitoring device of FIG. 1 .

[0014] Figure 3 It is shown Figure 2 A block diagram of a structural example of a photographic unit.

[0015] Figure 4 It is a perspective view showing an example of the outer appearance of the surroundings of the monitoring device in FIG. 1 .

[0016] Figure 5 It is shown in Figure 4 This is a plan view showing an example of the outer appearance of the surroundings of the monitoring device with the door closed.

[0017] Figure 6 It is shown Figure 2 A flowchart of an example of the processing content of the processor.

[0018] Figure 7 This is a block diagram showing a configuration example of a monitoring device according to Embodiment 2 of the present invention.

[0019] Figure 8 It is shown Figure 7 A flowchart of an example of the processing content of the processor.

[0020] Description of symbols

[0021] 1: monitoring system; 10: monitoring device; 15: processor; 16: memory; 17: photographing unit; 18: opening and closing sensor; 19: wireless communication unit; 20a, 20b: illumination sensor; 25: lens; 26: aperture; 27: filter; 28: image sensor; 29: automatic gain control circuit; 30: analog-to-digital converter; 31: image processing circuit; 32: automatic adjustment circuit; 33: photographing range; 35: ground; 36: wall; 37: door; 38: frame; 38a, 38b: frame part; 38c: step part; 39a, 39b: opening part; 40: shielding part; 45, 46: wiring board; 47: supporting part; 48: connector; 50: detection part; 55: monitoring device; PM: brightness adjustment parameter; PMD: parameter data; VD: image data. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In addition, in principle, the same components are denoted by the same reference numerals throughout all the drawings for describing the embodiments, and their repeated descriptions are omitted.

[0023] (Implementation Method 1)

[0024] 《Overview of surveillance system》

[0025] Figure 1A and Figure 1B 1 is a perspective view showing an example of the external appearance of a monitoring system according to Embodiment 1 of the present invention. Figure 1A and Figure 1B FIG. 3 shows a floor 35 and a wall 36 of a building, a frame 38 provided on the wall 36, and a door (opening and closing body) 37 mounted on the frame 38. The door 37 opens and closes relative to the frame 38. Figure 1A The state in which the door 37 is opened is shown in FIG. Figure 1B 3 shows a state where the door 37 is closed. In the specification, the plane directions of the floor 35 are referred to as the X direction and the Y direction, and the vertical direction of the floor 35, that is, the installation direction of the wall 36 is referred to as the Z direction. In addition, the frame 38 is sometimes also called a "door frame".

[0026] The door 37 separates the indoor and outdoor areas. The frame 38 includes a frame portion 38a disposed on the indoor side, a frame portion 38b disposed on the outdoor side, and a step portion 38c connecting the two frame portions 38a and 38b via a surface extending in the Z direction. The door 37 is in a closed state by contacting the step portion 38c. In addition, an opening portion 39a is provided in the frame portion 38a on the indoor side, and an opening portion 39b is also provided in the frame portion 38b on the outdoor side.

[0027] Here, the monitoring system 1 includes a door 37, a frame 38, and a monitoring device 10 for being arranged on the frame 38. Figure 1A As shown, the monitoring device 10 is used by being embedded in the frame 38. The opening 39a is provided for the imaging unit in the monitoring device 10, and the opening 39b is provided for the opening and closing sensor in the monitoring device 10, and the details will be described later.

[0028] In addition, a shielding member 40 such as a shielding plate is mounted on the door 37. Figure 1A and Figure 1B As shown, the shielding member 40 is mounted on the door 37 in such a manner that the opening 39a is shielded when the door 37 is closed, and the opening 39a is not shielded when the door 37 is opened. In addition, the shielding member 40 is an example of a shielding mechanism. The shielding mechanism is a mechanism that directly shields the lens of the photographic unit or indirectly shields the lens of the photographic unit via the opening 39a when the door 37 is closed. For example, the shielding mechanism can be realized by the door 37 itself by providing the opening 39a on the side of the frame portion 38b. In addition, the shielding mechanism can also be realized by a physical lens cover installed on the lens.

[0029] 《Structure of monitoring device》

[0030] Figure 2 1 is a block diagram showing an example of the configuration of the monitoring device of FIG. 1. The monitoring device 10 includes a processor (control unit) 15, a memory 16, a photographing unit 17, an opening and closing sensor 18, and a wireless communication unit 19. The photographing unit 17 Figure 1A The opening 39a provided in the frame 38 (frame portion 38a) as shown in the figure uses a lens to photograph a predetermined photographing range. The memory 16 is composed of a combination of a non-volatile memory such as a flash memory and a RAM (Random Access Memory). The memory 16 stores programs executed by the processor 15 and image data photographed by the photographing unit 17.

[0031] The opening and closing sensor 18 detects the opening and closing of the door 37, and more specifically, detects whether the door 37 is opened to a specified angle or closed to a specified angle. The opening and closing sensor 18 can be, for example, a reflective photoelectric sensor, or a non-contact sensor such as an inductive, capacitive, or magnetic proximity sensor. The reflective photoelectric sensor emits light and detects the presence or absence of reflected light from a detection component mounted on the door 37. The inductive proximity sensor detects the presence or absence of electromagnetic induction with a detection component mounted on the door 37. The capacitive proximity sensor detects the presence or absence of capacitive coupling with a detection component mounted on the door 37. The magnet proximity sensor detects the presence or absence of magnetic force from a detection component mounted on the door 37. In addition, in a representative example of the embodiment, a reflective photoelectric sensor is used as the opening and closing sensor 1.

[0032] The wireless communication unit 19 wirelessly transmits or receives various data to or from external devices such as management terminals. The data transmitted from the wireless communication unit 19 includes the image data of the imaging unit 17. Figure 1A When the monitoring device 10 is embedded in the frame 38 as shown, it may be difficult to communicate with an external device by wire. Therefore, it is useful to provide a wireless communication unit 19 such as Bluetooth (registered trademark) or Wi-Fi (registered trademark).

[0033] Here, the image data transmitted to the outside by the wireless communication unit 19 is deleted from the memory 16. In addition, in another embodiment, when the data capacity of all the image data stored in the memory 16 becomes greater than a certain value, the transmitted image data may be deleted. In addition, in a representative example of the embodiment, the wireless communication unit 19 performs wireless communication in accordance with the Wi-Fi standard.

[0034] The processor 15 controls the entire monitoring device 10 by executing a program stored in the memory 16, including the control of the imaging unit 17. As one of the control contents, the processor 15 causes the imaging unit 17 to start imaging when the opening and closing sensor 18 detects that the door 37 is opened from closed to open. On the other hand, when the opening and closing sensor 18 detects that the door 37 is closed from open to closed, the processor 15 causes the imaging unit 17 to stop imaging.

[0035] In addition, the processor 15 may be mounted on a microcontroller, for example. In this case, part or all of the memory 16 may also be mounted on the microcontroller. In addition, here, the control unit is implemented by software for the processor 15, but is not limited thereto, and may also be implemented by hardware such as FPGA (Field Programmable Gate Array), ASIC (Application Specific Integrated Circuit), or may be implemented by a combination of software and hardware.

[0036] By using the above method, necessary monitoring can be performed while ensuring privacy. Specifically, in the method of embodiment 1, the photographing unit 17 only takes pictures during the period from when the door 37 changes from closed to open to when it changes from open to closed. Therefore, the privacy of the user in the room can be ensured, and, for example, disputes between staff and users that may occur when the door 37 is open can be recorded. In addition, as another effect, by taking pictures only during the period from opening to closing, the power consumption of the photographing unit 17 can be reduced, and the capacity of the image data of the photographing unit 17 can also be reduced.

[0037] In addition, regarding privacy, even if the camera unit 17 does not take pictures while the door 37 is closed, as long as the user recognizes the existence of the camera unit 17, privacy may not be guaranteed for the user. For example, even if the camera unit 17 is difficult for the user to see as in Patent Document 1, the user in the room may feel that their privacy is violated because they recognize the existence of the camera unit 17, regardless of whether the camera is taken or not. Therefore, by setting Figure 1A and Figure 1B The above-described shielding mechanism (for example, the shielding member 40 ) enables the user to recognize that he or she is not being photographed, and can provide a sense of security that he or she is not being photographed.

[0038] Figure 3 It is shown Figure 2 The block diagram of the structural example of the imaging unit of FIG. The imaging unit 17 has a lens 25, an aperture 26, a filter 27, an image sensor 28, an automatic gain control circuit (AGC circuit for short) 29, an analog-to-digital converter (ADC for short) 30, and an image processing circuit 31. The lens 25 converges light from an imaging range 33. The aperture 26 adjusts the amount of light from the lens 25 according to the set aperture value. The filter 27 is, for example, an infrared removal filter.

[0039] The image sensor 28 includes, for example, a CMOS (Complementary Metal Oxide Semiconductor) type or CCD (Charge Coupled Device) type imaging element. Light from the imaging range 33 enters the image sensor 28 via the lens 25, the aperture 26, and the filter 27. The image sensor 28 receives the incident light through each imaging element (in other words, each pixel).

[0040] The AGC circuit 29 amplifies the pixel signal of each pixel from the image sensor 28 according to the set gain value. The ADC 30 converts the amplified pixel signal from the AGC circuit 29 into a digital value. The image processing circuit 31 generates image data VD based on the digital value from the ADC 30. The image data VD is stored in Figure 2 The automatic adjustment circuit 32 automatically adjusts the brightness adjustment parameter PM, which determines the brightness of the image. The brightness adjustment parameter PM includes at least one of the aperture value for the aperture 26, the exposure time for the image sensor 28, and the gain value for the AGC circuit 29.

[0041] The automatic adjustment circuit 32 sends or receives parameter data PMD associated with brightness adjustment to the processor 15. When the automatic adjustment circuit 32 receives the parameter data PMD from the processor 15, it automatically adjusts the brightness adjustment parameter PM according to the received parameter data PMD. Specifically, the parameter data PMD is used as the initial value of the brightness adjustment parameter PM. In addition, the automatic adjustment circuit 32 sends the automatically adjusted brightness adjustment parameter PM to the processor 15 as parameter data PMD according to a request from the processor 15. In addition, in other embodiments, the aperture 26 and the like may be omitted.

[0042] 《The shape of the surroundings of the surveillance device》

[0043] Figure 4 It is a perspective view showing an example of the outer appearance of the surroundings of the monitoring device in FIG. 1 . Figure 5 It is shown in Figure 4 A plan view showing an example of the outer appearance of the monitoring device and its surroundings with the door closed. Figure 4 The monitoring device 10 includes two wiring boards 45 and 46 connected by a connector 48 and a support member 47 for mounting the two wiring boards 45 and 46. The support member 47 is fixed to Figure 1A Frame 38 shown.

[0044] The wiring board 45 carries the imaging unit 17, and the wiring board 46 carries the opening and closing sensor 18. Figure 2 The processor 15, memory 16, and wireless communication unit 19 shown are also mounted on any of the two wiring boards 45 and 46 as appropriate. Figure 2 The processor 15, memory 16, imaging unit 17, opening / closing sensor 18, and wireless communication unit 19 are mounted on two wiring boards 45 and 46, but may be mounted on one wiring board.

[0045] Here, on door 37, in addition to Figure 1A In addition to the shielding member 40 (e.g., a shielding plate) shown, a detection member 50 is mounted on the surface in the thickness direction and is paired with the opening and closing sensor 18. The opening and closing sensor 18 detects the opening and closing of the door 37 by determining whether the detection member 50 is present within a predetermined detection range, that is, whether the opening angle of the door 37 is within an angle threshold. For example, when the opening and closing sensor 18 is a photoelectric sensor, the detection member 50 is a reflector.

[0046] Taking the photoelectric sensor as an example, the opening and closing sensor 18 includes Figure 5 When the opening angle of the door 37, including the closed state of the door 37 as shown, is within the angle threshold, the reflected light from the detection member 50 (e.g., the reflector) is detected. On the other hand, when the opening angle of the door 37 exceeds the angle threshold, the opening and closing sensor 18 cannot detect the reflected light from the detection member 50. Figure 5 2 is an XY plane view of the periphery of the monitoring device 10 , and for the sake of convenience of description, the detection member 50 and the shielding member 40 are shown in a see-through state.

[0047] Here, the angle threshold for distinguishing the opening and closing of the door 37 can be adjusted mainly by the installation position of the monitoring device 10 relative to the frame 38 and the mounting position of the opening and closing sensor 18 relative to the monitoring device 10. From this point of view, the monitoring device 10 is preferably Figure 1A As shown in FIG. 1 , the angle threshold is embedded in the side corresponding to the top portion of the door 37 among the sides constituting the frame 38. For example, when the mounting position of the opening and closing sensor 18 relative to the monitoring device 10 is the same, the closer the monitoring device 10 is installed to the rotation axis side of the door 37, the larger the angle threshold is. In addition, by embedding the monitoring device 10 in the side of the top portion, the imaging range of the imaging unit 17 can be expanded.

[0048] exist Figure 5 and Figure 1A In the example of FIG. 1 , the monitoring device 10 is provided on the rotation axis side of the door 37. Figure 5In the example, wiring board 46 is arranged parallel to the XY plane, but wiring board 45 carrying camera unit 17 is arranged to maintain a predetermined angle relative to the XY plane. Specifically, wiring board 45 is arranged so that lens 25 of camera unit 17 faces the door handle side of frame 38.

[0049] In addition, the opening and closing sensor 18 is Figure 2 As described in the foregoing, the photoelectric sensor or proximity sensor may be used, but is not limited to such sensors. For example, it may be a contact sensor such as an illumination sensor or a limit switch. That is, by embedding the opening and closing sensor 18 inside the frame 38, the illumination to the opening and closing sensor 18 becomes low when the door 37 is closed, and becomes high when the door 37 is opened. Therefore, an illumination sensor may be used as the opening and closing sensor 18.

[0050] 《Details of the processor (control unit)》

[0051] Figure 6 It is shown Figure 2 The following is a flowchart of an example of the processing contents of the processor of the monitoring device 10. It is preferred that the monitoring device 10 immediately performs clear photography when the opening change of the door 37 is detected. However, the brightness of the image is unstable during the period immediately after the photography starts, so it may be difficult to monitor during this period. That is, Figure 3 The adjustment operation of the automatic adjustment circuit 32 shown takes time, and there is a possibility that a dead time will occur during the monitoring period. Therefore, it is beneficial to use the following flow.

[0052] exist Figure 6 As long as the processor 15 continues monitoring, it will repeatedly execute the processing of step S102 to step S106 (step S101). In step S102, the processor 15 uses the opening and closing sensor 18 to detect the change of the door state. When the opening change from closed to open is detected in step S102, the processor 15 reads the parameter data PMD from the memory 16 and sends it to the imaging unit 17 (step S103). At this time, when the parameter data PMD is not stored in the memory 16, that is, when the monitoring device 10 is started for the first time, the predetermined specified data is sent to the imaging unit 17.

[0053] Next, the processor 15 uses a photography start instruction or the like to start photography of the photography unit 17, and returns to step S101 (step S104). In response to the photography start instruction, the automatic adjustment circuit 32 of the photography unit 17 automatically adjusts the brightness adjustment parameter PM while photographing the photography range, using the parameter data PMD from the processor 15 as the initial value. On the other hand, when a change from open to closed is detected in step S102, the processor 15 overwrites and records the brightness adjustment parameter PM used by the photography unit 17 at the time when the change to close is detected or at a predetermined time before the time as parameter data PMD in the memory 16 (step S105).

[0054] In step S105, specifically, the processor 15 periodically acquires parameter data PMD from the imaging unit 17, for example, and selects parameter data PMD at a predetermined time. The parameter data PMD at which time is selected is appropriately determined based on the size of the angle threshold for distinguishing the opening and closing of the door 37. For example, the smaller the angle threshold, the darker the image at the time when the closing change is detected, so the processor 15 can select a correspondingly earlier time.

[0055] After step S105, the processor 15 uses a photography stop command or the like to cause the photography unit 17 to end photography, and returns to step S101 (step S106). In response to the photography stop command, the photography unit 17, for example, shifts to a standby mode, which is a low power consumption mode. In addition, the order of step S103 and step S104 may be reversed, and the order of step S105 and step S106 may also be reversed. In addition, step S103 may also be executed before step S102.

[0056] As mentioned above, in Figure 6 In the process of FIG. 1 , when the processor 15 detects the closing change, the processor 15 records the brightness adjustment parameter PM used by the photographing unit 17 at the time of detecting the closing change as parameter data PMD (step S105). Then, the processor 15 reflects the recorded parameter data PMD in the next photographing of the photographing unit 17 (step S103).

[0057] Through such a process, the initial value of the automatic adjustment circuit 32 is determined to be a value close to the optimal value to some extent. Therefore, the monitoring device 10 can immediately take clear photos when the opening change is detected. In particular, in hotels, etc., since the illumination of the space is kept constant to some extent, the optimal value of the brightness adjustment parameter PM is generally the same this time and the next time. Therefore, it is more beneficial to reflect the brightness adjustment parameter PM used this time to the next time.

[0058] 《Main effects of implementation method 1》

[0059] As described above, by using the method of embodiment 1, it is representatively possible to perform necessary monitoring while ensuring confidentiality. That is, the communication between the user and the staff can be appropriately recorded, and the privacy of the user can be protected. Moreover, it is possible to reduce power consumption, reduce dead time during monitoring, etc. In addition, here, as an opening and closing body, a swing-type door 37 is taken as an example, but it can also be applied to swing-type windows and sliding doors and windows. Even in the case of using a sliding type, the above-mentioned angle threshold can be easily adjusted by the setting position of the monitoring device relative to the frame, etc.

[0060] (Implementation Method 2)

[0061] 《Structure of monitoring device》

[0062] Figure 7 This is a block diagram showing a configuration example of a monitoring device according to Embodiment 2 of the present invention. Figure 7 The monitoring device 55 is Figure 2 In addition to the configuration example of , two illuminance sensors 20a and 20b are further provided. The illuminance sensor 20a measures the illuminance in the room separated by the opening and closing body 37, and the illuminance sensor 20b measures the illuminance in the outside of the room separated by the opening and closing body 37. The installation position of the monitoring device 55 is the same as that of the first embodiment.

[0063] However, for example, the installation position of the illuminance sensors 20a and 20b is not limited to the inside of the frame 38. For example, the illuminance sensor 20a may be installed at a position on the indoor side outside the frame 38, and the illuminance sensor 20b may be installed at a position on the outdoor side outside the frame 38. In this case, the measurement results of the illuminance sensors 20a and 20b are sent to the processor 15 using wireless communication, for example, or by providing an opening for wiring in the frame 38. In addition, the illuminance sensors 20a and 20b can be buried in the frame 38 by providing openings for illuminance measurement at the indoor side and the outdoor side of the frame 38, respectively.

[0064] 《Details of the processor (control unit)》

[0065] Figure 8 It is shown Figure 7 A flowchart of an example of the processing contents of a processor. Figure 8 In the process shown, Figure 6 Compared with the process of Figure 6 Step S103 is replaced by Figure 8 Steps S201 and S202, and reduce Figure 6 Step S105. Figure 6Similarly, when the opening change of the door 37 is detected in step S102, the processor (control unit) 15 uses the two illuminance sensors 20a and 20b to measure the illuminance indoors and outdoors, respectively (step S201).

[0066] Next, the processor 15 determines the parameter data PMD based on the measurement result of the illumination in step S201, and sends the parameter data PMD to the imaging unit 17 (step S202). As a specific example, for example, a table or an operation expression indicating the correspondence between each illumination indoors and outdoors and the parameter data PMD is stored in advance in the memory 16. The processor 15 determines the parameter data PMD by referring to the correspondence in the memory 16.

[0067] After step S202, Figure 6 In the same manner as in the case of the camera 37 being closed, the processor 15 causes the camera unit 17 to start photographing, and returns to step S101 (step S104). Accordingly, the automatic adjustment circuit 32 of the camera unit 17 automatically adjusts the brightness adjustment parameter PM, for example, using the parameter data PMD from the processor 15 as an initial value. On the other hand, when the closing change of the door 37 is detected in step S102, the processor 15 causes the camera unit 17 to end photographing, and returns to step S101 (step S106).

[0068] As mentioned above, in Figure 8 In the process of FIG. 20 , the processor 15 determines the parameter data PMD based on the measurement results of the two illuminance sensors 20a and 20b, and reflects the determined parameter data PMD in the photography of the photography unit 17 (step S202). Here, the optimal value of the brightness adjustment parameter PM in the state where the door 37 is opened can be fixed to a certain extent based on the relationship between the indoor and outdoor illuminances. Therefore, by using Figure 8 process, and Figure 6 Compared with the process of FIG. 1 , even when the illumination of the space changes frequently to a certain extent, the initial value of the automatic adjustment circuit 32 can be determined to be a value close to the optimal value.

[0069] In addition, Figure 6Similarly, the order of steps S201, S202 and step S104 can be reversed. In addition, steps S201 and S202 can also be executed before step S102. In this case, although the illuminance sensors 20a and 20b are always in operation, preparations for optimizing the brightness adjustment parameter PM can be made before the opening change is detected, so that the dead time during the monitoring period can be further reduced. On the other hand, if steps S201 and S202 are executed after step S102, the two illuminance sensors 20a and 20b can be stopped before the opening change is detected, so that power consumption can be reduced.

[0070] 《Main effects of implementation method 2》

[0071] As described above, by using the method of Embodiment 2, it is possible to obtain the same effects as the various effects described in Embodiment 1. Furthermore, even when the illumination of the space changes frequently to a certain extent, the dead time during monitoring can be reduced.

[0072] In other embodiments, a moving body detection sensor may be further added, so that when there is movement around the door (when a person approaches the door), the brightness is set according to the outputs of the two illumination sensors 20a and 20b and photography is started. In this case, effective images can be recorded from the time the door is opened.

[0073] In addition, in other embodiments, the imaging unit may be configured not to include the lens 25. In this case, the shielding mechanism shields the opening 39a.

[0074] Furthermore, in other embodiments, a shutter or a shield may be provided on the monitoring device 10. In this case, the lens 25 (opening 39a) is shielded by the shutter or the shield of the monitoring device 10, so the shielding mechanism may not be provided on the door 37.

[0075] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention.

Claims

1. A monitoring system, comprising: A frame, which is installed in a building; An opening / closing body, which is installed on the frame and can open and close relative to the frame; A photographing unit, which is embedded inside the frame and photographs using a lens from an opening provided in the frame; An opening / closing sensor, which detects the opening and closing of the opening / closing body; A control unit, which controls the photographing unit; and A shielding mechanism, which is installed on the opening / closing body, The control unit causes the photographing unit to start photographing when it detects, using the opening / closing sensor, an opening change of the opening / closing body from closed to open, and causes the photographing unit to end photographing when it detects, using the opening / closing sensor, a closing change of the opening / closing body from open to closed, The shielding mechanism shields the lens of the photographing unit when the opening / closing body is in the closed state.

2. The monitoring system according to claim 1, Wherein, The photographing unit adjusts the brightness of an image using a brightness adjustment parameter during photographing, The control unit sends parameter data that is the basis of the brightness adjustment parameter to the photographing unit.

3. The monitoring system according to claim 2, Wherein, The monitoring system further comprises: A first illuminance sensor, which measures the illuminance inside the room separated by the opening / closing body; and A second illuminance sensor, which measures the illuminance outside the room separated by the opening / closing body, The control unit determines the parameter data based on the measurement results of the first illuminance sensor and the second illuminance sensor, and reflects the determined parameter data in the photographing of the photographing unit.

4. The monitoring system according to claim 1, Wherein, The photographing unit is embedded in a side of the frame corresponding to the top portion of the opening / closing body.

5. The monitoring system according to claim 1, Wherein, A detection component is installed on a surface in the thickness direction of the opening / closing body, The opening / closing sensor detects the opening and closing of the opening / closing body by determining whether the detection component exists within a specified detection range.

6. The monitoring system according to claim 5, Wherein, The photographing unit, the opening / closing sensor, and the control unit are installed on one or more wiring boards, A wireless communication unit for transmitting the image data of the photographing unit to the outside is also installed on one or more of the wiring boards.

7. A monitoring device, which is used for being installed in a frame equipped with an opening / closing body, Wherein, The monitoring device comprises an opening / closing sensor, a control unit, and a photographing unit used by being embedded inside the frame, The photographing unit photographs using a lens from an opening provided in the frame, The opening / closing sensor detects the opening and closing of the opening / closing body, The control unit causes the photographing unit to start photographing when it detects, using the opening / closing sensor, an opening change of the opening / closing body from closed to open, and causes the photographing unit to end photographing when it detects, using the opening / closing sensor, a closing change of the opening / closing body from open to closed, When the opening / closing body is in the closed state, the lens of the photographing unit is shielded by a shielding mechanism installed on the opening / closing body.

8. The monitoring device according to claim 7, wherein, the monitoring device further has: a first illuminance sensor that measures the illuminance inside the room separated by the opening / closing body; and a second illuminance sensor that measures the illuminance outside the room separated by the opening / closing body, the imaging unit adjusts the brightness of an image using a brightness adjustment parameter during imaging, the control unit determines parameter data as a basis for the brightness adjustment parameter for the imaging unit based on the measurement results of the first illuminance sensor and the second illuminance sensor, and reflects the determined parameter data in the imaging of the imaging unit.

Images