Video transmission device and video transmission method

Abstract

A moving image transmission device is provided that can facilitate settings for a target camera for aggregated moving image data. [Solution] The video transmission device (wireless repeater) includes a video acquisition unit, a video processing unit, a wireless communication unit, and a setting change unit. The video acquisition unit acquires multiple video data shot and created by multiple cameras. The video processing unit creates aggregated video data in which videos represented by the multiple video data are arranged side by side on a screen. The wireless communication unit transmits at least the aggregated video data using a wireless network. The setting change unit transmits commands to the cameras to change the video settings of a selected portion or all of the multiple cameras.

Description

[Technical Field]

[0001] The present invention relates to a video transmission device that transmits video data created by capturing images with a camera via a wireless network. [Background technology]

[0002] Patent Document 1 discloses an image processing device that stores video data acquired from multiple cameras connected via a network. The image processing device transmits bit rates, frame rates, etc. to the multiple cameras to change their settings. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-36083 Summary of the Invention [Problem to be solved by the invention]

[0004] The image processing device of Patent Document 1 saves video data acquired from a camera and transmits it externally. However, Patent Document 1 does not describe creating aggregated video data (data in which multiple video data are combined into one video data) by arranging multiple video data side by side on a screen, nor does it describe sending a command to a camera that captures the video data before aggregation. Furthermore, when creating aggregated video data, a problem can arise in that the multiple video data acquired from the camera must have the same video settings (e.g., bit rate, frame rate, etc.) in order to create the aggregated video data properly.

[0005] The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a video transmission device that can easily set up a target camera for aggregated video data.

[0006] The problem to be solved by the present invention is as described above. Next, the means for solving this problem and the effects thereof will be explained.

[0007] According to a first aspect of the present invention, there is provided a video transmission device having the following configuration. That is, the video transmission device includes a video acquisition unit, a video processing unit, a wireless communication unit, and a setting change unit. The video acquisition unit acquires multiple video data shot and created by multiple cameras. The video processing unit creates aggregated video data in which videos represented by the multiple video data are arranged side by side on a screen. The wireless communication unit transmits at least the aggregated video data using a wireless network. The setting change unit transmits a command to a selected part or all of the multiple cameras to change the video settings of the camera.

[0008] This allows the video transmission device that creates and transmits the aggregated video data to automatically change the settings of the camera used to create the aggregated video data, eliminating the need for the operator to individually configure the settings of such cameras, thereby reducing the burden on the operator.

[0009] In the video transmission device, it is preferable that the setting change unit transmits the command to all cameras used to create the aggregate video data so that the video settings of the cameras are the same.

[0010] This ensures that the video settings of all cameras used to create the aggregated video data are the same, making it possible to create appropriate aggregated video data.

[0011] In the video transmission device, it is preferable that the video settings in the command transmitted by the setting change unit include at least one of a resolution, a frame rate, and a key frame frequency.

[0012] Even if only some cameras have high resolution or frame rate when creating aggregated video data, the resolution or frame rate must be adjusted to match that of the other cameras during aggregation. Therefore, by making at least one of the resolution and frame rate the same across multiple cameras, it is possible to avoid creating video data with unnecessarily high resolution from a specific camera. Furthermore, if the key frame frequency is the same, errors due to misalignment of key frame timing are less likely to occur.

[0013] In the video transmission device, it is preferable that the setting change unit transmits the command to the camera so as to set the video settings to be processable by the video processing unit.

[0014] This allows the video settings to be automatically adjusted to match the specifications and specs of the video transmission device.

[0015] In the video transmission device, it is preferable that the setting change unit transmits the command to the camera so as to set the video setting selected in accordance with the wireless communication setting used in the wireless network.

[0016] Since the available bandwidth is known according to the wireless communication settings, such as the wireless communication standard, the video settings can be changed so that the video data volume is adjusted accordingly.

[0017] The video transmission device preferably has the following configuration: the video transmission device includes a storage unit that stores the video data, and the setting change unit transmits the command to the camera to set the video settings selected based on the remaining storage capacity of the storage unit.

[0018] By changing the video settings of the camera depending on the remaining storage capacity, for example, when the remaining storage capacity is low, the image quality of the video data can be reduced, thereby extending the time that video data can be stored.

[0019] In the video transmission device, it is preferable that the setting change unit transmits the instruction to the camera so as to set the video setting selected according to the currently available bandwidth of the wireless network.

[0020] This allows the video settings to be changed so that the amount of video data corresponds to the bandwidth.

[0021] The video transmission device preferably has the following configuration: the video processing unit performs processing to analyze the video data, and the setting change unit transmits the command to the camera to set the video settings selected based on the analysis result of the video processing unit.

[0022] This allows the video settings of the camera to be changed depending on the content of the video data (for example, the frequency of the movement of the object, etc.).

[0023] According to a second aspect of the present invention, there is provided the following video transmission method. That is, the video transmission method includes a video acquisition step, a video processing step, a wireless communication step, and a setting change step. In the video acquisition step, a video transmission device acquires multiple video data shot by multiple cameras. In the video processing step, the video transmission device creates and transmits aggregated video data in which videos represented by the multiple video data are arranged side by side on a screen. In the wireless communication step, the video transmission device transmits at least the aggregated video data using a wireless network. In the setting change step, the video transmission device transmits to a selected part or all of the multiple cameras a command to change the video settings of the selected camera.

[0024] This allows the video transmission device that creates and transmits the aggregated video data to change the settings of the camera used to create the aggregated video data, eliminating the need for the operator to individually configure the settings of such cameras, thereby reducing the burden on the operator. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a schematic diagram of a wireless communication system according to an embodiment of the present invention; [Figure 2] Block diagram of a wireless repeater. [Figure 3] 3A and 3B are diagrams illustrating video data and aggregated video data. [Figure 4] 10 is a flowchart showing a process of changing the video settings of a camera according to the settings of a wireless repeater (cameras to be aggregated, supported video settings, and wireless standards). [Figure 5] 10 is a flowchart showing a process for changing the video settings of a camera depending on the status of a wireless repeater (available bandwidth, remaining storage capacity). [Figure 6] FIG. 1 is a diagram illustrating wireless communication via a wireless repeater and the number of hops. [Figure 7] 10 is a flowchart showing a process for changing the video settings of the camera in accordance with the analysis results (motion detection time interval) of the video data. DETAILED DESCRIPTION OF THE INVENTION

[0026] Next, an embodiment of the present invention will be described with reference to the drawings. First, a wireless communication system 1 will be described with reference to FIGS.

[0027] The wireless communication system 1 is installed in a facility such as a factory, a parking lot, or an office. The wireless communication system 1 is a system for transmitting video data captured by multiple cameras 31 via wireless communication so that the video data can be viewed on a notebook PC 32 or the like. The wireless communication system 1 includes a wireless router 10 and multiple wireless repeaters 20. Hereinafter, the wireless router 10 and the wireless repeaters 20 will be collectively referred to as wireless devices.

[0028] The wireless router 10 establishes a wireless LAN environment within the facility that conforms to a predetermined wireless communication standard. The wireless communication standard may be, for example, IEEE802.11, but is not limited to this. In the following description, the wireless LAN environment established by the wireless router 10 and the network used for wireless communication between the wireless router 10 and the wireless repeater 20 will be referred to as the wireless network.

[0029] The wireless repeater 20 is a device that relays communication in a wireless network and transmits video data captured by the camera 31, and is also referred to as a video transmission device. Note that a video transmission device that also functions as the wireless repeater 20 is just one example, and the technology of the present application may also be applied to a video transmission device that does not have the functionality of the wireless repeater 20. As shown in FIG. 2 , the wireless repeater 20 includes a wireless communication unit 21, a video acquisition unit 22, a control unit 23, and a storage unit 24.

[0030] The wireless communication unit 21 includes a wireless communication module and communicates wirelessly with the wireless router 10, other wireless repeaters 20, and notebook PC 32, etc. The video acquisition unit 22 includes a wired communication module and acquires video data from multiple cameras 31. The control unit 23 is realized by an arithmetic unit such as a CPU operating according to a program stored in the storage unit 24, and performs processing related to wireless communication and video data. The storage unit 24 is an HDD, SSD, or flash memory, and stores programs, control data, video data, etc.

[0031] The control unit 23 performs various controls, including a video processing unit 23 a that performs video processing functions, and a setting change unit 23 b that changes the video settings of the camera 31 .

[0032] The video processing performed by the video processing unit 23a includes a process of aggregating multiple video data to create aggregated video data. Specifically, as shown in FIG. 3, consider a case in which the wireless repeater 20 receives video data from four cameras 31, A to D, and aggregated video data is created using the video data created by all of the cameras 31. As shown in FIG. 3, the aggregated video is a video in which videos created by multiple cameras are arranged side by side on a single screen. The number of videos constituting the aggregated video is arbitrary and may be changeable. For example, three of four videos can be selected and one aggregated video can be created using the three videos. The aggregated video data created by the video processing unit 23a is a single piece of data. In other words, the laptop PC 32 can play the aggregated video shown in FIG. 3(b) simply by playing the aggregated video data received from the video processing unit 23a. There is no need for the laptop PC 32 to aggregate multiple video data.

[0033] The processing performed by the video processing unit 23a further includes analyzing the video data. Specifically, the video data is analyzed to extract frames in which changes occur among the frames of the video data. In other words, the time when a movement is detected in the video data is identified. The method for using the analysis results of the video data will be described later.

[0034] The setting change unit 23b changes the video settings to enable video processing by the video processing unit 23a, and sends a command to change the video settings to each of the multiple cameras 31 connected to the device itself, thereby changing the video settings of the cameras 31. The video settings are setting items related to the video data created by the cameras 31, and include, for example, the frame rate, resolution, format, and key frame frequency. The frame rate is the number of frames per second. As the frame rate increases, the bit rate increases. The resolution is the number of vertical and horizontal pixels in each frame. As the resolution increases, the bit rate increases. The format indicates the video compression standard. The bit rate may change depending on the format. The key frame frequency is the frequency at which key frames are set. Thus, the video settings include setting items related to the bit rate.

[0035] Here, it is preferable that the video settings of the video data from each camera from which aggregated video data is created be the same. This is because, even if only some of the video data has a high bit rate, the bit rate will be reduced to match the specifications of the aggregated video data. Specifically, even if video data with a higher frame rate and higher resolution than the other cameras 31 is acquired from camera A, the frame rate of the aggregated video data is predetermined, and the resolution allocated to each piece of video data is fixed. Therefore, the high bit rate video data acquired from camera A's 31 cannot be utilized. For the above reasons, it is preferable that the video settings of the video data from which aggregated video data is created be the same (more specifically, that the video settings are suitable for the aggregated video data). Furthermore, if the key frame frequencies of the video data from which aggregated video data is created are different, errors may occur when aggregating the data into one aggregated video data. Therefore, it is preferable that the key frame frequencies of the video data from which aggregated video data is created be the same.

[0036] In this embodiment, the original video data from which the aggregated video data is created are all the same in terms of resolution, frame rate, and key frame frequency. However, this is a preferred example, and the original video data from which the aggregated video data is created may differ in any of resolution, frame rate, and key frame frequency.

[0037] The setting change unit 23b changes the video settings of the camera 31 in accordance with various conditions. The various conditions include, for example, the settings of the wireless repeater 20 (particularly settings related to video processing), the current communication state, and the analysis results of the video data. This allows the video settings to be automatically adjusted to an appropriate setting in accordance with various situations. This reduces the burden on the operator.

[0038] The storage unit 24 stores information about the camera 31 to be aggregated, which has been designated in advance by the user. This information is identification information (e.g., MAC address) that identifies the camera 31 to be aggregated. Furthermore, the storage unit 24 also stores information about video settings, such as frame rates that the camera 31 can support. The storage unit 24 also stores information about wireless communication settings. The wireless communication settings include, for example, the communication standard used in the wireless network, and identification information and authentication information required for connecting wireless devices. The wireless communication settings are set in advance by the user.

[0039] Next, a process for changing the video settings of the camera according to the settings of the wireless repeater (cameras to be aggregated, supported video settings, and wireless standards) will be described with reference to Fig. 4. In the following description, the explanation of how the setting change unit 23b sends a command to the camera 31 may be omitted.

[0040] First, the control unit 23 selects the camera 31 for which the video settings are to be changed (S101). The control unit 23 will eventually change the video settings of all the cameras 31 connected to the control unit 23. Therefore, the order in which the video settings are changed is arbitrary, and the camera 31 can be selected by any appropriate method.

[0041] Next, the control unit 23 determines whether the selected camera 31 is a camera 31 to be aggregated (in other words, a camera 31 that creates video data that is the source of aggregate image data) (S102). The camera 31 to be aggregated is specified in advance by the user in the wireless repeater 20, and the wireless repeater 20 stores identification information of the specified camera 31. Therefore, the control unit 23 determines whether the selected camera 31 is a camera 31 to be aggregated based on the stored identification information.

[0042] If the control unit 23 determines that the selected camera 31 is the camera 31 to be aggregated (Yes in S102), the setting change unit 23b sets the resolution, frame rate, and key frame frequency to match the aggregated video (S103). As described above, it is preferable that the video settings of the video data from which the aggregated video data is created are the same, and these video settings are created and stored in advance. In other words, by performing the process of the flowchart in FIG. 4 for all cameras 31, the video settings can be automatically made the same for all cameras 31 to be aggregated.

[0043] If the control unit 23 determines that the selected camera 31 is not a camera 31 to be aggregated (No in S102), the control unit 23 acquires the current video setting from the camera 31 (S104). Next, the control unit 23 determines whether the frame rate of the acquired video setting exceeds 30 (S105). Here, it is assumed that the maximum frame rate that can be processed by the video processing unit 23a of the wireless repeater 20 is 30. If the control unit 23 determines that the frame rate exceeds 30, the setting change unit 23b sets the frame rate of the camera 31 to 30 (S106). Specifically, the setting change unit 23b notifies the camera 31 via the wired communication module to set the frame rate to 30. Note that, although the maximum frame rate has been described as 30 in the present embodiment, the frame rate may be arbitrarily changed (for example, the maximum value may be 10) by user setting. The frame rate indicates the number of images (frames) displayed per second and is expressed in units of FPS (Frames per Second).

[0044] The processing of steps S104 to S106 when the selected camera 31 is not the camera 31 to be aggregated can be broadly conceptualized as follows: First, the wireless repeater 20 acquires the current video settings from the camera 31. Next, the wireless repeater 20 determines whether the current video settings of the camera 31 include any video settings that cannot be processed by the video processing unit 23a (in other words, video settings other than the video settings that are preset for creating aggregated video data). If the current video settings include any video settings that cannot be processed by the video processing unit 23a, the wireless repeater 20 selects video settings that can be processed by the video processing unit 23a (in other words, video settings that are preset for creating aggregated video data) and changes the video settings of the camera 31. In steps S104 to S105, the frame rate is given as an example of a video setting, but other video settings can be processed in a similar manner.

[0045] By the processing of steps S101 to S106, the video settings according to the aggregation are applied to the cameras 31 to be aggregated, and the video settings that can be supported by the wireless repeater 20 are applied to the other cameras 31.

[0046] Next, the control unit 23 determines whether the wireless standard used for wireless communication by the wireless repeater 20 is 11n / b / g in the wireless communication settings stored in the storage unit 24 (S107). The wireless standards IEEE802.11n / b / g are known to be slower than the latest communication standards such as IEEE802.11ax / ac / ad. That is, in step S107, it is determined whether the wireless repeater 20 communicates using a slow wireless standard. Note that the wireless communication settings do not necessarily have to be acquired from the storage unit 24, but may also be acquired from another device via a wireless network.

[0047] If the control unit 23 determines that the wireless standard is IEEE802.11n / b / g, the setting change unit 23b sets the frame rate to be reduced to 15 (S108) and the bit rate to be reduced to 1 Mbps (S109). Reducing the bit rate may result in a reduction in resolution.

[0048] The processing of steps S107 to S109 can be conceptualized as follows: First, the wireless repeater 20 identifies the standard that the wireless repeater 20 will use for wireless communication. The standard used for wireless communication corresponds to a specific example of wireless communication settings. Next, the wireless repeater 20 changes the video settings of the camera 31 to match the identified standard. In particular, if the communication speed based on the identified standard is slower than the standard, the wireless repeater 20 selects a video setting that reduces the bit rate and changes the video settings of the camera 31. Alternatively, if the communication speed based on the identified standard is faster than the standard, the video settings may be changed to increase the bit rate.

[0049] This completes the video setting for one camera 31. The control unit 23 also performs video setting for the other cameras 31 sequentially or simultaneously in parallel in accordance with the processes from steps S101 to S109.

[0050] Next, with reference to FIGS. 5 and 6, a process for changing the video settings of the camera depending on the state of the wireless repeater (available bandwidth, remaining storage capacity) will be described.

[0051] First, the control unit 23 calculates the bandwidth available to the wireless repeater 20 (S201). The available bandwidth is calculated by multiplying the bit rate by the maximum number of connections by the maximum number of hops. The maximum number of connections is the number of wireless devices that can connect to the wireless network and communicate. In the wireless communication system 1, a wireless network exceeding the maximum number of connections is not constructed. The greater the maximum number of connections, the smaller the bandwidth available per device. Here, the number of hops is the number of wireless repeaters 20 through which data must pass before being transmitted from the wireless repeater 20 to the notebook PC 32, as shown in FIG. 6. The maximum number of hops is the maximum value of the number of hops. If the number of hops exceeds the maximum number of hops, the corresponding packet is discarded. The greater the maximum number of hops, the more bandwidth is constrained. The maximum number of connections and the maximum number of hops in this wireless communication system 1 are stored in a management terminal (e.g., the wireless router 10) of the wireless network, and the wireless repeater 20 obtains the maximum number of connections and the maximum number of hops from the management terminal.

[0052] Next, the control unit 23 determines whether the wireless standard used for wireless communication by the wireless repeater 20 is 11ax / ac in the wireless communication settings stored in the storage unit 24 (S202). Here, 11ad is not considered, but 11ad may be included in the determination of step S202. If the control unit 23 determines that the wireless standard is 11ax / ac, the setting change unit 23b sets the resolution of the camera 31 to Full HD (S203). If the wireless standard is not 11ax / ac, the control unit 23 determines whether the wireless standard is 11n / a or other (S204). If the control unit 23 determines that the wireless standard is 11n / a, the setting change unit 23b sets the resolution of the camera 31 to HD (S205). If the control unit 23 determines that the wireless standard is not 11n / a, the setting change unit 23b sets the resolution of the camera 31 to VGA (S206).

[0053] The processing of steps S201 to S206 can be broadly conceptualized as follows: First, the wireless repeater 20 calculates the bandwidth available to the wireless repeater 20, and then identifies the wireless standard used by the wireless repeater 20. In other words, the wireless communication status (bandwidth and communication speed) of the wireless repeater 20 is identified, video settings are selected accordingly, and the video settings of the camera 31 are changed. This allows the video settings to be changed to match the wireless communication status of the wireless repeater 20.

[0054] Here, the video setting of camera 31 being only the resolution is one example, and the frame rate, etc. may also be changed. Furthermore, the video setting of camera 31 may be changed according to the available bandwidth calculated in step S201. For example, if the available bandwidth is below a standard, the video setting may be changed so that the bit rate is lower than the default video setting.

[0055] Next, the control unit 23 determines the remaining storage capacity of the storage unit and determines whether the remaining storage capacity is less than 10 GB (S207). If the control unit 23 determines that the remaining storage capacity is less than 10 GB, the setting change unit 23b sets the bit rate of the camera 31 to 1 Mbps (S208). Here, it is assumed that the normal bit rate of the camera 31 is greater than 1 Mbps. Therefore, by the processes of steps S207 and S208, when the storage capacity decreases, the bit rate can be lowered to suppress the rate at which the storage capacity decreases. This allows video data captured and created by multiple cameras 31 to be appropriately transmitted via wireless communication to other wireless devices (e.g., devices constituting the wireless communication system 1) without causing the storage capacity of the wireless repeater 20 to run out.

[0056] Note that instead of specifying the bit rate, the video settings may be specified using the resolution or frame rate. Furthermore, when the storage capacity exceeds 10 GB (a reference value) due to the deletion of unnecessary video data or the like, the bit rate may be restored to its original value. In this embodiment, the storage capacity is divided into two stages: a reference value and a value less than the reference value. However, the storage capacity may be divided into three or more stages, and a bit rate or the like may be specified according to each stage. Furthermore, in this embodiment, the control unit 23 determines that the remaining storage capacity is less than 10 GB, but the value may be freely changeable by the user or by a factory setting.

[0057] Next, with reference to FIG. 7, a process for changing the video settings of the camera according to the analysis results of the video data (time interval of motion detection) will be described.

[0058] The system to which the process of FIG. 7 is applied is, for example, a security system or an anomaly detection system, and is a system whose main purpose is to detect and record the occurrence of an event that is different from normal.

[0059] First, the video processing unit 23a analyzes video data acquired from the camera 31 (S301). In this embodiment, adjacent frames of the video data are compared to detect whether there has been a change, in other words, whether there has been any movement of the target object within a certain period of time.

[0060] The moving image processing unit 23a may identify an object appearing in an image by using image analysis, etc. In this case, the moving image processing unit 23a may detect whether or not a predetermined object is moving.

[0061] The control unit 23 determines whether or not a motion has been detected in the video data based on the analysis result of the video data (S302). If a motion has been detected, the control unit 23 records the time when the motion was detected (motion detection time) (S303).

[0062] Next, the control unit 23 calculates a motion detection time difference based on past motion detection times. The motion detection time difference is the time interval at which motion is detected, and quantifies the frequency of motion occurring in the video data. The motion detection time difference may be the difference between the two most recent motion detection times, or may be the average value of the differences between three or more motion detection times.

[0063] If the control unit 23 determines that the motion detection time difference is within 10 seconds (S304), the setting change unit 23b sets the frame rate to 30 (S305). If the control unit 23 determines that the motion detection time difference is within 1 minute (S306), the setting change unit 23b sets the frame rate to 15 (S307). If the control unit 23 determines that the motion detection time difference is within 10 minutes (S308), the setting change unit 23b sets the frame rate to 5 (S309).

[0064] This allows a frame rate to be set according to the motion detection time difference. Specifically, the shorter the motion detection time difference, the higher the frame rate that is set. When the motion detection time difference is short, the object moves frequently, so a high frame rate is preferable even if it increases the size of the video data. On the other hand, when the motion detection time difference is long, the object moves only rarely, so even a low frame rate can adequately detect motion and further reduce the size of the video data.

[0065] Analyzing video data to detect movement is one example, and other events may also be detected. For example, the video data may be analyzed to detect the speed of an object (the distance an object moves per unit time in the video data, for example, the speed of the arm of an arm robot), and if the speed of the object is faster than a reference value, a high frame rate may be set. Alternatively, if text is identified by analyzing the video data, a resolution may be set so that the text is visible, rather than the movement in the video data.

[0066] The processes in the three flowcharts described above can be combined. For example, the process of changing the video settings based on the state of the wireless repeater 20 in Fig. 5 and the process of changing the video settings based on the analysis results of the video data in Fig. 7 may be used for the camera 31 that is the target of the aggregated video in Fig. 4, or may be used for a camera 31 used for purposes other than the aggregated video. Alternatively, appropriate video settings may be determined by taking into consideration all of the settings of the wireless repeater 20, the state of the wireless repeater 20, and the analysis results of the video data, and the determined video settings may be applied to the camera 31.

[0067] As described above, the wireless repeater 20 of this embodiment includes the video acquisition unit 22, the video processing unit 23a, the wireless communication unit 21, and the setting change unit 23b, and performs the following video transmission method. The video acquisition unit 22 acquires multiple video data shot and created by multiple cameras 31 (video acquisition step). The video processing unit 23a creates aggregated video data in which videos represented by the multiple video data are arranged side by side on a screen (video processing step). The wireless communication unit 21 transmits at least the aggregated video data using a wireless network (wireless communication step). The setting change unit 23b transmits to the cameras 31, for some or all of the cameras 31 selected from the multiple cameras 31, a command to change the video settings of the cameras 31 (setting change step).

[0068] This allows the wireless repeater 20 that creates and transmits the aggregated video data to automatically change the settings of the camera used to create the aggregated video data, eliminating the need for the operator to individually configure the settings of this type of camera 31, thereby reducing the burden on the operator.

[0069] In the wireless repeater 20 of this embodiment, the setting change unit 23b sends a command to the cameras 31 so that the video settings of all the cameras 31 used to create the aggregated video data are the same.

[0070] This ensures that the video settings of the camera 31 used to create the aggregated video data are the same, making it possible to create appropriate aggregated video data.

[0071] In the wireless repeater 20 of this embodiment, the video settings in the command sent by the setting change unit 23b include at least one of the resolution, the frame rate, and the key frame frequency.

[0072] Even if only some cameras 31 have a high resolution or frame rate when creating aggregated video data, it is necessary to match the resolution or frame rate of the other cameras 31 during aggregation. Therefore, by making at least one of the resolution and frame rate the same among multiple cameras 31, it is possible to avoid creating video data with unnecessarily high precision from a specific camera. Furthermore, if the key frame frequency is the same, errors due to misalignment of key frame timing are less likely to occur.

[0073] In the wireless repeater 20 of this embodiment, the setting change unit 23b sends a command to the camera 31 to set video settings that can be processed by the video processing unit 23a.

[0074] This allows the video settings to be automatically adjusted to match the specifications and specs of the wireless repeater 20.

[0075] In the wireless repeater 20 of this embodiment, the setting change unit 23b sends a command to the camera 31 to set the video setting selected according to the wireless communication setting used in the wireless network.

[0076] Since you can see the approximate available bandwidth depending on the wireless communication settings, you can change the video settings so that the video data volume is accordingly.

[0077] The wireless repeater 20 of this embodiment includes a storage unit 24 that stores video data. The setting change unit 23b sends a command to the camera 31 to set the video settings selected based on the remaining storage capacity of the storage unit 24.

[0078] By changing the video settings of the camera 31 according to the remaining storage capacity, for example, when the remaining storage capacity is low, the image quality of the video data can be reduced, thereby extending the time that video data can be stored.

[0079] In the wireless repeater 20 of this embodiment, the setting change unit 23b sends a command to the camera 31 to set the video setting selected according to the currently available bandwidth of the wireless network.

[0080] This allows the video settings to be changed so that the amount of video data corresponds to the bandwidth.

[0081] In the wireless repeater 20 of this embodiment, the video processing unit 23a performs processing to analyze video data. The setting change unit 23b sends a command to the camera 31 to set the video setting selected based on the analysis result of the video processing unit 23a.

[0082] This allows the video settings of the camera 31 to be changed depending on the content of the video data.

[0083] The preferred embodiment of the present invention has been described above, but the above configuration can be modified, for example, as follows. Each modification may be made alone, or multiple modifications may be made in any combination.

[0084] In the above embodiment, the wireless communication system 1 includes a plurality of wireless repeaters 20, but the wireless communication system 1 may include only one wireless repeater 20.

[0085] The flowcharts shown in the above embodiments are merely examples, and some processes may be omitted, the contents of some processes may be changed, or new processes may be added.

[0086] Furthermore, although the notebook PC 32 has been given as an example of a device that receives video data and the like via a wireless network, a smartphone or a tablet terminal may be used instead of or in addition to the notebook PC 32. [Explanation of symbols]

[0087] 1. Wireless communication systems 10. Wireless Router 20 Wireless repeater (video transmission device) 21 Radio Communication Department 22 Video Acquisition Unit 23 Control Unit 23a Video processing section 23b Setting change section 24 Memory section 31 Camera 32 laptops

Claims

1. a video acquisition unit that acquires a plurality of video data shot and created by a plurality of cameras; a video processing unit that creates aggregated video data in which the videos represented by the plurality of video data are arranged side by side on a screen; a wireless communication unit that transmits at least the aggregated video data using a wireless network; a setting change unit that transmits to a selected part or all of the cameras a command to change video settings of the cameras; A video transmission device comprising:

2. The video transmission device according to claim 1, The video transmission device is characterized in that the setting change unit transmits the command to the cameras used to create the aggregate video data so that the video settings of all the cameras are the same.

3. The video transmission device according to claim 2, The video transmission device, wherein the video settings of the command transmitted by the setting change unit include at least one of resolution, frame rate, and key frame frequency.

4. The video transmission device according to claim 1, The video transmission device is characterized in that the setting change unit transmits the command to the camera so that the video setting can be processed by the video processing unit.

5. The video transmission device according to claim 1, The video transmission device is characterized in that the setting change unit transmits the command to the camera so that the video setting selected in accordance with the wireless communication setting used in the wireless network is used.

6. The video transmission device according to claim 1, a storage unit for storing the video data; The video transmission device is characterized in that the setting change unit transmits the instruction to the camera so that the video setting selected based on the remaining storage capacity of the storage unit is used.

7. The video transmission device according to claim 1, The video transmission device is characterized in that the setting change unit sends the instruction to the camera so that the video setting selected according to the currently available bandwidth of the wireless network is used.

8. The video transmission device according to claim 1, the video processing unit performs processing to analyze the video data, The video transmission device is characterized in that the setting change unit transmits the command to the camera so that the video setting selected based on the analysis result of the video processing unit is set.

9. a video acquisition step in which the video transmission device acquires a plurality of video data shot and created by a plurality of cameras; a video processing step in which the video transmission device creates and transmits aggregated video data in which videos represented by the plurality of video data are arranged side by side on a screen; a wireless communication step in which the video transmission device transmits at least the aggregated video data using a wireless network; a setting change step in which the video transmission device transmits to a selected part or all of the cameras a command to change the video settings of the cameras; A video transmission method comprising:

Images