Method for displaying a video stream of a scene

Abstract

A method for displaying a video stream of a scene, specifically a method for displaying a video stream of a scene captured by a surveillance camera on a display of a client device remote from the surveillance camera, is disclosed. The method includes: receiving the video stream and information indicating the on / off state of an IR illuminator illuminating the scene captured by the surveillance camera at the client device; setting display settings of the display differently based on the on / off state of the IR illuminator; and displaying the video stream on the display using the set display settings. Also disclosed is a client device including a display, a receiver configured to receive a video stream of a scene captured by a surveillance camera remote from the client device, and control circuitry. The control circuitry is configured to: extract the information indicating the on / off state of the IR illuminator; set the display settings of the display differently when the IR illuminator is on compared to when the IR illuminator is off; and display the video stream on the display using the set display settings.

Description

Technical Field

[0001] The present invention relates to a method for displaying a video stream of a scene captured by a surveillance camera on a display of a client device. Furthermore, a client device and a surveillance system comprising the client device are presented. Background Art

[0002] When monitoring a scene with a surveillance camera, it's sometimes necessary to add light to the scene in order to capture images of sufficient quality. Illuminators can be integrated into the surveillance camera or external to it. Illuminators can also add visible light. However, since image sensors used in surveillance cameras are typically sensitive to infrared radiation (IR), or more specifically, near-infrared radiation (NIR), illuminators can advantageously add IR rather than visible light. This provides sufficient light for image capture while avoiding interference with visible light. The decision on when to illuminate a scene with IR can be made based on the lighting conditions in the scene.

[0003] A video stream of a scene captured by a surveillance camera can be viewed on a client device located remotely from the surveillance camera. However, the user experience may vary depending on the lighting conditions at the scene. For example, the ability to see details in the video stream may vary depending on the lighting conditions at the scene. Therefore, there is a need for better display of the video stream at the client device. Summary of the Invention

[0004] It is an object to mitigate, alleviate or eliminate one or more of the above mentioned deficiencies and disadvantages in the art, singly or in any combination, and to address at least the above mentioned problems.

[0005] According to a first aspect, a method for displaying a video stream of a scene captured by a surveillance camera on a display of a client device is provided. The client device is remote from the surveillance camera. The method includes: receiving the video stream; receiving information indicating the on / off state of an IR illuminator illuminating the scene captured by the surveillance camera; setting display settings of the display differently based on whether the on / off state of the IR illuminator is on or off; and displaying the video stream on the display using the set display settings.

[0006] By means of the present method, the details of the video stream can be better displayed so that the operator can see the details better. This is because the overall appearance of the display can be coordinated. The appearance of the display can be set based on the appearance of the video stream from the surveillance camera. For example, a normally dark video stream, a video stream captured with an IR illuminator turned on, can be displayed using a first setting of the display, and a normally bright video stream, a video stream captured when the IR illuminator is turned off and is therefore illuminated by visible light, can be displayed using a second setting of the display. There is no dependency on the time zone or time at which the client device is located compared to the location at which the video stream was captured. Therefore, the playback of the video stream can be performed differently depending on the environment at the surveillance camera at which the video stream was captured. Further possible benefits of the present method will be discussed in the detailed description section below.

[0007] The display settings may include color settings for a background area of ​​the display surrounding a video stream display area of ​​the display.

[0008] When the on / off state of the IR illuminator is on, the color setting of the background area may be set to be darker than when the on / off state of the IR illuminator is off.

[0009] Display settings can include brightness settings for the display.

[0010] When the on / off state of the IR illuminator is on, the brightness setting may be dimmer than when the on / off state of the IR illuminator is off.

[0011] Display settings can include the color temperature setting of the display.

[0012] When the on / off state of the IR illuminator is on, the color temperature setting may be warmer than when the on / off state of the IR illuminator is off.

[0013] The method may further include extracting the on / off status of the IR illuminator from metadata of the video stream.

[0014] The method may further include requesting, by the client device, an on / off status of the IR illuminator.

[0015] The method may further include transmitting, from the IR illuminator, an on / off state of the IR illuminator. The transmitting of the on / off state of the IR illuminator may be performed when the on / off state changes.

[0016] According to a second aspect, a non-transitory computer-readable recording medium is provided, wherein the non-transitory computer-readable recording medium has instructions stored thereon, possibly in the form of computer-readable program code, which, when executed on a device having processing capabilities, is configured to perform the method of the first aspect.

[0017] Where applicable, the above features of the method according to the first aspect also apply to this second aspect. In order to avoid unnecessary repetitions, reference is made to the above.

[0018] According to a third aspect, a client device is provided. The client device includes a display, a receiver configured to receive a video stream of a scene captured by a surveillance camera located at a remote location from the client device, and control circuitry. The control circuitry is configured to execute: an IR illuminator status function configured to extract information indicating the on / off state of an IR illuminator illuminating the scene captured by the surveillance camera; a display setting function configured to set display settings of the display differently when the on / off state of the IR illuminator is on compared to when the on / off state of the IR illuminator is off; and a display function configured to display the video stream on the display using the display settings set by the display setting function.

[0019] Where applicable, the above features of the method according to the first aspect also apply to the third aspect. In order to avoid unnecessary repetitions, reference is made to the above.

[0020] According to a fourth aspect, a surveillance system is provided. The surveillance system includes: a surveillance camera configured to capture a video stream of a scene; an IR illuminator configured to illuminate the scene captured by the surveillance camera with IR light according to lighting conditions at the scene; and a client device according to the third aspect. The client device is located remotely from the surveillance camera and the IR illuminator.

[0021] The surveillance camera may be configured to add metadata to the video stream, wherein the metadata includes information indicating an on / off status of the IR illuminator.

[0022] Where applicable, the above features of the method according to the first aspect also apply to the fourth aspect. In order to avoid unnecessary repetitions, reference is made to the above.

[0023] Further scope of applicability of the present invention will become apparent from the detailed description given below. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are given by way of example only, as various changes and modifications within the scope of the present invention will become apparent to those skilled in the art based on this detailed description.

[0024] Therefore, it should be understood that the present invention is not limited to the specific component parts of the described devices, or the actions of the described methods, as these devices and methods can be changed. It should also be understood that the terminology used herein is only for the purpose of describing specific embodiments and is not intended to be limiting. It must be noted that, unless the context clearly indicates otherwise, the articles "a", "an", "the" and "said" as used in the specification and the appended claims are intended to indicate the presence of one or more elements. Thus, for example, reference to "a unit" or "the unit" may include multiple devices, etc. In addition, the words "comprises", "comprising", "containing" and similar expressions do not exclude other elements or steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other aspects of the present invention will now be described in more detail with reference to the accompanying drawings. The drawings should not be considered limiting; rather, they are for explanation and understanding.

[0026] As illustrated in the drawings, the sizes of layers and regions may be exaggerated for illustrative purposes and, therefore, are provided to illustrate the general structures. Like reference numerals refer to like elements throughout.

[0027] Figure 1 The diagram shows a surveillance system including a surveillance camera, an IR illuminator, and a client device.

[0028] Figure 2 yes Figure 1 Schematic block diagram of a client device.

[0029] Figure 3 The schematic diagram shows a display of a client device divided into a background area and a video stream display area.

[0030] Figure 4 is a block diagram of a method for displaying a video stream of a scene captured by a surveillance camera on a display of a client device. DETAILED DESCRIPTION

[0031] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to be thorough and complete and to fully convey the scope of the invention to those skilled in the art.

[0032] Figure 1 The figure shows a surveillance system 1. The surveillance system 1 comprises a surveillance camera 10, an IR illuminator 20 and a client device 30.

[0033] The surveillance camera 10 is typically a digital video camera. The surveillance camera 10 is configured to monitor a scene. Typically, this is accomplished by capturing a video stream of the scene.

[0034] The IR illuminator 20 is configured to illuminate the scene monitored by the surveillance camera 10 with IR light. The IR illuminator 20 includes one or more light sources 21. Each light source 21 is configured to emit IR light. The IR light emitted by the one or more light sources 21 forms an illumination beam emitted by the IR illuminator 20. The one or more light sources 21 may be LED-based light sources. Therefore, the one or more light sources 21 of the illuminator may be IR-LEDs.

[0035] The IR illuminator 20 can be controlled by a controller 22. The controller 22 is configured to control the illumination power delivered by the IR illuminator 20. The illumination power delivered by the IR illuminator 20 can depend on the lighting conditions in the scene. For example, the IR illuminator 20 can be configured to turn on when the lighting conditions are equal to or below a preset threshold, and to turn off when the lighting conditions are above the preset threshold. The controller 22 of the IR illuminator 20 can be configured to transmit information indicating whether the IR illuminator 20 is on or off. Thus, the IR illuminator 20 can be configured to transmit information regarding the on / off state of the IR illuminator 20. This information regarding the on / off state of the IR illuminator 20 can be transmitted to the client device 30. This information regarding the on / off state of the IR illuminator 20 can be transmitted when the on / off state changes. This information regarding the on / off state of the IR illuminator 20 can be transmitted upon request from the client device 30. This information regarding the on / off state of the IR illuminator 20 can be provided to the surveillance camera 10. The surveillance camera 10 can be configured to add metadata to the video stream, wherein the metadata includes information indicating the on / off state of the IR illuminator 20. The metadata is temporally correlated with the video stream. Thus, the metadata indicates which image frames of the video stream were captured with the IR illuminator 20 in the on state, and which image frames of the video stream were captured with the IR illuminator 20 in the off state.

[0036] The controller 22 may also control other features of the IR illuminator 20. For example, the controller 22 may control the width of the illumination beam emitted by the IR illuminator 20. The controller 22 may control the illumination beam emitted by the IR illuminator 20 so that it adapts to the zoom setting of the surveillance camera 10. This allows the entire field of view of the surveillance camera 10 to be evenly illuminated. According to another example, the controller 22 may individually control one or more light sources 21 of the IR illuminator 20.

[0037] The surveillance camera 10 and the IR illuminator 20 may be in the form of separate devices. Figure 1As in the example of FIG. 1 , the IR illuminator 20 can be mounted to the surveillance camera 10 using the illuminator mounting bracket 23. Alternatively, the IR illuminator 20 can be arranged at a distance from the surveillance camera 10. Still alternatively, the IR illuminator 20 can form an integral part of the surveillance camera 10. Common to all of these different possible arrangements of the surveillance camera 10 and the IR illuminator 20 is that the IR illuminator 20 is configured to illuminate the scene monitored by the surveillance camera 10.

[0038] Client device 30 is located remotely from surveillance camera 10 and IR illuminator 20. In this context, remote means that client device 30 is located in a different location than surveillance camera 10 and IR illuminator 20. For example, client device 30 may be located in a different building and / or a different city or part of a city than surveillance camera 10 and IR illuminator 20. Client device 30 is configured to send data to surveillance camera 10 and / or IR illuminator 20 and / or receive data from surveillance camera 10 and / or IR illuminator 20. The data is transmitted via communication network 40. Communication network 40 may be wired and / or wireless, using any type of network connection standard (e.g., a mobile internet communication standard (3G, 4G, or 5G, etc.) and / or WiFi). For example, client device 30 is configured to receive a video stream of the scene monitored by surveillance camera 10 via communication network 40. Thus, surveillance camera 10 is configured to send the captured video stream to client device 30. Further, the client device 30 may be configured to receive information about the on / off state of the IR illuminator 20 from the IR illuminator 20. Alternatively, or in combination, the client device 30 may be configured to receive information about the on / off state of the IR illuminator 20 from the surveillance camera 10 or from a control device configured to control the IR illuminator 20 and / or the surveillance camera 10. Many other kinds of data may also be transmitted between the client device 30 and the surveillance camera 10 and / or the IR illuminator 20.

[0039] refer to Figure 2 , the client device 30 will be discussed in more detail. The client device 30 can be any type of device configured to receive and display the video stream captured by the surveillance camera 10. According to non-limiting examples, the client device 30 can be a laptop, a stationary computer, a mobile phone, or a tablet. The client device 30 includes a display 31, a receiver 32, a control circuit 33, and a memory 34.

[0040] The receiver 32 is configured to receive data transmitted through the communication network 40. For example, the receiver 32 is configured to receive a video stream of a scene captured by the surveillance camera 10 from the surveillance camera 10. The receiver 32 may be further configured to receive information about the on / off state of the IR illuminator 20 configured to illuminate the scene captured by the surveillance camera 10.

[0041] The control circuit 33 is configured to perform overall control of the functions and operations of the client device 30. The control circuit 33 may include a processor 35, such as a central processing unit (CPU), a microcontroller, or a microprocessor. The processor 35 is configured to execute program code stored in the memory 34 to perform the functions and operations of the client device 30.

[0042] The memory 34 may be one or more of a buffer, flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory, a random access memory (RAM), and another suitable device. In a typical arrangement, the memory 34 may include non-volatile memory for long-term data storage and volatile memory used as system memory for the control circuit 33. The memory 34 may exchange data with the control circuit 33 via a data bus. There may also be accompanying control lines and an address bus between the memory 34 and the control circuit 33.

[0043] The functions and operations of the client device 30 may be implemented in the form of executable logic routines (e.g., lines of code, software programs, etc.) that are stored on a non-transitory computer-readable medium (e.g., memory 34) of the client device 30 and executed by the control circuitry 33 (e.g., using the processor 35). In addition, the functions and operations of the client device 30 may be stand-alone software applications or form part of a software application that performs additional tasks associated with the client device 30. The functions and operations described may be considered methods that the corresponding device is configured to perform. In addition, although the functions and operations described may be implemented in software, such functions may also be performed via dedicated hardware or firmware, or some combination of hardware, firmware, and / or software.

[0044] The control circuitry 33 is configured to execute an illuminator status function 36. The illuminator status function 36 is configured to extract information indicating the on / off state of the IR illuminator 20. The illuminator status function 36 can be configured to extract the information indicating the on / off state of the IR illuminator 20 from metadata in the video stream of the scene. In this case, the surveillance camera 10 is configured to include such metadata in the video stream. Alternatively, or in combination, the illuminator status function 36 can be configured to extract the information indicating the on / off state of the IR illuminator 20 by actively requesting the information from the IR illuminator 20, the surveillance camera 10, and / or a control device that controls the IR illuminator 20 and / or the surveillance camera 10. Thus, the illuminator status function 36 can be configured according to a pull notification setting, wherein the information indicating the on / off state of the IR illuminator 20 is pulled by the client device 10 from the IR illuminator 20, the surveillance camera 10, and / or the control device that controls the IR illuminator 20 and / or the surveillance camera 10. Alternatively, or in combination, the illuminator status function 36 may be configured to extract information indicating the on / off state of the IR illuminator 20 by passively receiving information from the IR illuminator 20, from the surveillance camera 10, and / or from a control device that controls the IR illuminator 20 and / or the surveillance camera 10. Thus, the illuminator status function 36 may be configured according to a push notification setting, wherein information indicating the on / off state of the IR illuminator 20 is pushed to the client device 30 from the IR illuminator 20, from the surveillance camera 10, and / or from a control device that controls the illuminator 20 and / or the surveillance camera 10.

[0045] The control circuit 33 is further configured to execute a display setting function 37. The display setting function 37 is configured to set the display setting of the display 31. The display setting function 37 is configured to set the display setting of the display 31 based on the information indicating the on / off state of the IR illuminator 20. Specifically, the display setting function 37 is configured to set the display setting of the display 31 differently when the on / off state of the IR illuminator 20 is on than when the on / off state of the IR illuminator 20 is off.

[0046] like Figure 3As schematically illustrated in , the display settings may include a color setting for a background area 31a of the display 31 that surrounds a video stream display area 31b of the display 31. When the on / off state of the IR illuminator 20 is on, the color setting of the background area 31a may be darker than when the on / off state of the IR illuminator 20 is off. Thus, when the on / off state of the IR illuminator 20 is on, a relatively dark color setting (i.e., a dark color such as black predominates) is used for the background area 31a, and when the on / off state of the IR illuminator 20 is off, a relatively bright color setting (i.e., a bright color such as white predominates) is used for the background area 31a. The background area 31a may completely or partially surround the video stream display area 31b. Figure 3 In the illustrated example, background area 31a completely surrounds video stream display area 31b. By setting the background area's color to a relatively dark color when the IR illuminator 20 is in the on / off state, the overall appearance of display 31 is shifted toward dark colors. This is because video streams captured using IR illumination are typically dark. By shifting the overall appearance of display 31 toward dark colors (i.e., predominantly black), the display's appearance is made easier for the operator's eyes to see. Furthermore, with this display's appearance, details of objects in the video stream are more distinguishable. Conversely, the same applies when the IR illuminator 20 is in the on / off state. In this case, the overall appearance of display 31 is shifted toward bright colors. This is because video streams captured without IR illumination (i.e., illuminated by natural sunlight or artificial visible light) are typically bright. By shifting the overall appearance of the display toward bright colors (i.e., predominantly bright colors), the display's appearance is made easier for the operator's eyes to see. Furthermore, with this display's appearance, details of objects in the video stream are more distinguishable. Furthermore, by using different color settings depending on whether the IR illuminator 20 is on or off, power may be conserved at the client device (and may also conserve battery life).

[0047] Alternatively, or in combination, the display settings may include a brightness setting for the display 31. When the on / off state of the IR illuminator 20 is on, the brightness setting may be dimmer than when the on / off state of the IR illuminator 20 is off. The same effects and possible benefits discussed above in connection with the color setting of the background area 31 a apply to setting the display brightness differently based on whether the on / off state of the IR illuminator 20 is on or off. Thus, when the IR illuminator 20 is on when capturing the displayed video stream, an overall relatively dark appearance of the display may be beneficial, and when the IR illuminator 20 is off when capturing the displayed video stream, an overall relatively bright appearance of the display may be beneficial.

[0048] Alternatively, or in combination, the display settings may include a color temperature setting for the display 31. When the on / off state of the IR illuminator 20 is on, the color temperature setting may be set to be warmer than when the on / off state of the IR illuminator 20 is off. The same effects and potential benefits discussed above in connection with the color setting of the background area 31 a apply to setting the color temperature of the display differently based on whether the on / off state of the IR illuminator 20 is on or off. Thus, when the IR illuminator 20 is on when capturing the displayed video stream, an overall relatively warmer color temperature appearance of the display may be beneficial, and when the IR illuminator 20 is off when capturing the displayed video stream, an overall relatively cooler color temperature appearance of the display may be beneficial.

[0049] The control circuit 33 is further configured to execute a display function 38. The display function 38 is configured to display the video stream on the display 31 using the display settings set by the display setting function 37.

[0050] Combine Figure 4 A method 400 for displaying a video stream of a scene captured by a surveillance camera 10 on a display 31 of a client device 30 will now be discussed. The method 400 is based on the inventors' insight that by setting the display settings of the client device's display differently based on whether the IR illuminator 20 is on or off when the surveillance camera 10 captures the video stream displayed on the display 31, the overall appearance of the display 31 can be configured so that the display is easy for the operator's eyes to view. Furthermore, the present method can conserve power consumption and, therefore, battery life at the client device.

[0051] Some of all the steps of method 400 may be performed by the functionality of the client device 30 described above. However, it is also appreciated that some or all of the steps of method 400 may be performed by similar functionality executed at other devices. The method includes the following steps. The steps may be performed in any suitable order.

[0052] A video stream to be displayed is received S402 at the client device 30. The video stream is captured at the surveillance camera 10. The video stream may be sent directly from the surveillance camera 10 to the client device 30. Alternatively, the video stream may be received from a video management server (VMS) configured to manage video streams from the surveillance camera 10 and possibly a plurality of other surveillance cameras.

[0053] Information indicating the on / off status of the IR illuminator 20 illuminating the scene captured by the surveillance camera 10 is received S404 at the client device 30. Receiving S404 information indicating the on / off status of the IR illuminator 20 may include extracting the on / off status of the IR illuminator 20 from metadata in the video stream. Therefore, method 400 may further include adding the information indicating the on / off status of the IR illuminator 20 as metadata to the video stream. This has been discussed above, and to avoid excessive repetition, this step of method 400 will not be discussed further. Alternatively, or in combination, receiving S404 information indicating the on / off status of the IR illuminator 20 may include requesting the on / off status of the IR illuminator 20 from the client device 30. Requesting this information using a pull notification was discussed above, and to avoid excessive repetition, this step of method 400 will not be discussed further. Alternatively, or in combination, receiving S404 information indicating the on / off status of the IR illuminator 20 may include transmitting the on / off status of the IR illuminator 20 from the IR illuminator 20. The manner in which this information is received using push notifications is discussed above, and to avoid excessive repetition, this step of method 400 will not be discussed further.

[0054] The display settings of the display 31 are set differently 406 based on whether the on / off state of the IR illuminator is on or off. The display settings may include color settings for the background area 31a of the display 31 surrounding the video stream display area 31b of the display 31. When the on / off state of the IR illuminator 20 is on, the color setting of the background area 31a may be darker than when the on / off state of the IR illuminator 20 is off. Alternatively or in combination, the display settings may include brightness settings for the display 31. When the on / off state of the IR illuminator 20 is on, the brightness setting may be darker than when the on / off state of the IR illuminator 20 is off. Alternatively or in combination, the display settings may include color temperature settings for the display 31. When the on / off state of the IR illuminator 20 is on, the color temperature setting may be warmer than when the on / off state of the IR illuminator 20 is off.

[0055] The video stream is displayed S408 on the display 31 using the set display settings.

[0056] Those skilled in the art will appreciate that the present invention is by no means limited to the preferred embodiments described above. On the contrary, within the scope of the appended claims, many modifications and variations are possible, for example, the client device 30 may be configured to run an application configured to perform the method 400 discussed above.

[0057] Additionally, variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims.

Claims

1. A method for displaying a video stream of a scene captured by a surveillance camera on a display of a client device located remotely from the surveillance camera, the method comprising: receiving the video stream; receiving information indicating an on / off status of an IR illuminator used to illuminate the scene captured by the surveillance camera; differently setting a display setting of the display based on whether the on / off state of the IR illuminator is on or off; as well as displaying the video stream on the display using the set display settings, wherein the display comprises a video stream display area in which the video stream is displayed and a background area surrounding the video stream display area, and The setting of the display setting includes setting a color setting of the background area based on the on / off state of the IR illuminator indicated by the received information.

2. The method according to claim 1, wherein When the on / off state of the IR illuminator is on, the color setting of the background area is darker than when the on / off state of the IR illuminator is off.

3. The method according to any one of claims 1 to 2, wherein: The display settings include brightness settings of the display.

4. The method according to claim 3, wherein: When the on / off state of the IR illuminator is on, the brightness setting is dimmer than when the on / off state of the IR illuminator is off.

5. The method according to claim 1, wherein The display settings include a color temperature setting for the display.

6. The method according to claim 5, wherein: When the on / off state of the IR illuminator is on, the color temperature setting is warmer than when the on / off state of the IR illuminator is off.

7. The method according to claim 1, further comprising: The on / off status of the IR illuminator is extracted from metadata in the video stream.

8. The method according to claim 1, further comprising: The on / off status of the IR illuminator is requested by the client device.

9. The method according to claim 1, further comprising: The on / off state of the IR illuminator is transmitted from the IR illuminator when the on / off state changes.

10. A non-transitory computer-readable storage medium having instructions stored thereon, said instructions being operable to implement the video encoding method according to claim 1 when executed on a device having processing capabilities.

11. A client device comprising: monitor; a receiver configured to receive a video stream of a scene captured by a surveillance camera located at a location remote from the client device; as well as The control circuit is configured to perform: an IR illuminator status function configured to extract information indicating an on / off status of an IR illuminator used to illuminate the scene captured by the surveillance camera, a display setting function configured to set display settings of the display differently when the on / off state of the IR illuminator is on than when the on / off state of the IR illuminator is off, and A display function configured to display the video stream on the display using the display settings set by the display setting function wherein the display comprises a video stream display area in which the video stream is displayed and a background area surrounding the video stream display area, and Wherein the display setting function is configured to set a color setting of the background area based on the on / off state of the IR illuminator indicated by the received information.

12. A monitoring system comprising: a surveillance camera configured to capture a video stream of the scene; an IR illuminator configured to illuminate the scene captured by the surveillance camera with IR light according to lighting conditions at the scene; as well as The client device of claim 11, wherein the client device is located remotely from the surveillance camera and the IR illuminator.

13. The system according to claim 12, wherein: The surveillance camera is configured to add metadata to the video stream, wherein the metadata includes information indicating an on / off status of the IR illuminator.

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