JP2019075723A - Video transmission method, video transmission system, and selection device - Google Patents

Abstract

To provide a technology for securing quality of transmission video and suppressing compression of transmission band in a video transmission system.SOLUTION: The video transmission system includes control means for controlling that image data is duplicated from an output device selected by a selection device and transmitted to a selection device and not controlling video data to be duplicated and transmitted to the selection device from an output device not selected by the selection device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video transmission method, a video transmission system, and a selection device.

  In a conventional video transmission system, an interface such as SDI (Serial Digital Interface) is often used as a dedicated transmission path whose transmission performance is guaranteed. In recent years, the speed and capacity of an IP (Internet Protocol) network have been increased, and a technology for transmitting video using an IP network has been realized. In the video production workflow, adoption of technology for transmitting video using an IP network has begun.

  A video transmission system using an IP network is characterized by using a device such as a hub to increase the freedom of rearranging transmission paths. By connecting a necessary number of devices via a transmission path using an IP network, it is possible to freely realize adaptive video transmission according to a shooting scene.

  On the other hand, IP networks are also characterized in that it is difficult to compensate for the arrival time of transmission data. This is because other communication data are mixed in the transmission path, or the transmission path is changed due to a failure of the device. If it is not possible to compensate for the arrival time of transmission data, video data to be transmitted will be lost. Therefore, in a video transmission system using an IP network, in order to prevent the loss of video data to be transmitted and secure the quality of the transmitted video, it has been proposed to duplicate transmission paths to prevent the transmission data from being lost. There is.

  The following Patent Document 1 solves the problem that the processing load on the server increases in a redundant system in which the server and each client are connected by redundant networks A and B and the client simultaneously transmits the same data to the server. Technology has been proposed. Each client adds the same sequence number to transmission data, and the server checks the sequence number of the received data. When the first sequence number data is received, the data reception process is continued, and when the same sequence number data is received, the data is discarded.

  Further, according to Patent Document 2 described below, in program distribution, unnecessary compression of transmission capacity on the network by signals that are not actually used can be avoided, and network bandwidth can be efficiently used. Technology has been proposed. The route distribution control unit 400 distributes to a plurality of different distribution routes of the IP network 500 for each minimum program component required to reproduce a program, and distributes it as an IP stream together with route information and ES configuration information. Then, the stream to be distributed is received by the receiver 600, and a program component necessary for reproducing the selected program and a route for receiving the program component are specified based on the route information and the ES configuration information.

JP 2002-335251 A JP, 2011-23830, A

  When connecting a large number of imaging devices in a video transmission system using an IP network, duplicating and transmitting the video of all the imaging devices squeezes the transmission band beyond the maximum transmission capacity of the transmission path, and the video quality There are cases where it can not be secured. The above-mentioned Patent Documents 1 and 2 do not consider such a case.

  Therefore, the present invention has an object to provide a technology for securing the quality of transmission video and suppressing compression of the transmission band in a video transmission system.

  In order to solve the problems described above, a video transmission method according to an embodiment of the present invention is a selection step in which a selection device selects at least one output device from a plurality of output devices capable of outputting video data in duplicate. And control the video data from the selected output device to be duplexed and transmitted to the selection device, and not to control the video data from the non-selected output device to be duplexed and transmitted to the selection device Control steps.

  Further, a video transmission system according to an embodiment of the present invention includes a plurality of output devices capable of duplicating and outputting video data, and a selection device for selecting at least one output device from the plurality of output devices. A video transmission system, wherein control is performed such that video data is duplicated from an output device selected by the selection device and transmitted to the selection device, and video data is duplicated from an output device not selected by the selection device. And control means not controlling to be transmitted to the selection device.

  Further, a selection device according to an embodiment of the present invention is a selection device for selecting at least one output device from a plurality of output devices capable of outputting image data by duplicating and outputting the image data from the selected output device. Control means is controlled to control data to be duplexed and transmitted to the selection device, and not to control video data from the non-selected output device to be duplexed and transmitted to the selection device.

  According to the present invention, in the video transmission system, securing of the quality of the transmission video and suppression of the transmission band are suppressed by controlling whether or not the transmission video is duplexed depending on whether each imaging device is selected or not. It will be possible to

FIG. 1 is a block diagram showing a configuration of a video transmission system according to Embodiment 1. FIG. 6 is a first diagram for explaining the flow of video data in the video transmission system shown in FIG. 1; It is FIG. 2 for demonstrating the flow of the video data in the video transmission system shown in FIG. It is a flowchart which shows the transmission channel setting process by a monitor. It is a flowchart for demonstrating the reception process of video data. It is a flowchart for demonstrating the decoding process of the video data of a selection channel. FIG. 7 is a block diagram showing a configuration of a video transmission system according to Embodiment 2. It is a figure for demonstrating the flow of the video data in the video transmission system shown in FIG. 15 is a flowchart showing transmission channel setting processing by a monitor in the second embodiment. FIG. 20 is a first diagram for explaining the flow of video data in the video transmission system of the third embodiment. FIG. 20 is a second diagram for explaining the flow of video data in the video transmission system of the third embodiment. FIG. 10 is a flowchart for describing a duplexing setting change process by the monitor 30. FIG.

  Hereinafter, embodiments of the present invention will be described using the drawings. The technical scope of the present invention is determined by the scope of the claims, and is not limited by the embodiments exemplified below. Moreover, not all combinations of features described in the embodiments are essential to the present invention. The contents described in the specification and the drawings are for illustrative purposes only and should not be considered as limiting the present invention. Various modifications (including organic combinations of the respective embodiments) are possible based on the spirit of the present invention, and they are not excluded from the scope of the present invention. That is, the configuration in which each embodiment and its modification are combined is all included in the present invention.

Embodiment 1
FIG. 1 is a block diagram showing the configuration of a video transmission system according to the first embodiment. The imaging devices (cameras) 1, 2 and 3 are output devices for imaging a subject for the purpose of relaying events such as sports and creating video content such as movies, and outputting video data obtained by imaging. . The imaging devices 1, 2, and 3 each have a configuration capable of duplicating and outputting video data.

  The transmission paths 11 to 16, 21 and 22 are each a transmission path of an IP (Internet Protocol) network, and may be a wired transmission path or a wireless transmission path. The transmission paths 11 and 12 are configured such that data packets of the same video data can be duplicated and transmitted. Similarly, the transmission paths 13 and 14, the transmission paths 15 and 16, and the transmission paths 21 and 22 are also configured to be able to duplex and transmit data packets of the same video data.

  The network hub 20 is a relay of an IP network provided between the imaging devices 1 to 8 and the monitor 30. The monitor 30 is a display device having a switcher function (selection function) for selecting one or more pieces of video data from a plurality of input video data. The monitor 30 also has a function of controlling the operations of the imaging devices 1, 2, and 3 connected via the IP network.

  The monitor 30 includes LAN-IFs 40 and 41, memories 51, DMACs 54 and 55, a combining processing unit 56, a video processing unit 57, a display unit 58, an output IF 59, processors 60, 61 and 62, and an operation unit 70.

  The LAN-IFs (interfaces) 40, 41 communicate with the imaging devices 1, 2, 3 connected via the network hub 20, transmit control signals to the imaging devices 1, 2, 3, The video data transmitted from 2 and 3 is received.

  The memory 51 temporarily stores the video data received via the LAN-IFs 40 and 41. The memory 51 also stores control data to be transmitted to the imaging devices 1, 2 and 3 via the LAN-IFs 40 and 41, and data necessary for the processors 60, 61 and 62 to perform various processes.

  The processor 60 performs a switcher operation. The processor 60 selects one or more video data from the plurality of video data received via the LAN-IFs 40 and 41. The selected video data is output to the broadcasting device 31 connected to the rear stage of the monitor 30. The selected video data is displayed on the display unit 58. The processor 60 performs processing of sorting out data packets output from a desired imaging device from data packets received via the LAN-IFs 40 and 41 in order to realize the switcher function. The processor 60 also performs a complementing process (recovery process) when a drop occurs in the input data. The device that executes the switcher operation may be configured separately from the monitor 30.

  The processor 61 performs decoding processing and decompression processing of video data. The decompression process is a process of decompressing compressed video data and converting it into raster data. Also, the processor 61 performs data transfer control using the frame buffer in the memory 51. The processor 62 performs overall control (system control) of the operation of each functional block included in the monitor 30. The processor 62 performs various controls in accordance with an instruction command received by the user operating the operation unit 70. The processors 61, 62, 63 are, for example, CPUs (Central Processing Units), and control various operations by reading and executing programs from the ROM.

  The DMAC (Direct Memory Access Controller) 54, 55 reads data from the memory 51 based on a previously designated address and data transfer length, and transfers the data to the combining processing unit 56 and the reduction processing unit 63 in the subsequent stage. The reduction processing unit 63 performs reduction processing on the input via the DMAC 55 to generate video data with a reduced number of pixels. The combining processing unit 56 combines the main video data input through the DMAC 54 and the sub video data input through the DMAC 55 and the reduction processing unit 63. The monitor 30 may, for example, reduce the sub video data transmitted from the imaging device 2 with respect to the main video data transmitted from the imaging device 1, combine them, and display the picture in picture. It is possible.

  The video processing unit 57 performs correction processing (tone conversion processing) and the like on the video data output from the combining processing unit 56. The display unit 58 is configured by a display device such as a liquid crystal display, and displays input video data on a screen. The output IF (intermediate) 59 outputs the video data output from the video processing unit 57 to the broadcasting device 31. The broadcasting device 31 is configured of, for example, a storage for recording input video data, and a sending device for sending live broadcast video data from a broadcasting station.

  2 and 3 are diagrams for explaining the flow of video data in the video transmission system shown in FIG. FIG. 2 is a diagram showing the flow of video data when the imaging device 1 is selected as the main transmission channel by the switcher function of the monitor 30. As shown in FIG. FIG. 3 is a diagram showing the flow of video data when the imaging device 2 is selected as the main transmission channel by the switcher function of the monitor 30. As shown in FIG.

  As shown in FIG. 2, when the imaging device 1 is selected, the video data V1 transmitted from the imaging device 1 to the monitor 30 is output to the broadcast device 31 and displayed on the display unit 58 of the monitor 30. . At this time, since the video data V2 and V3 output from the imaging devices 2 and 3 may be used for live broadcasting or the like, the video data can be switched while continuing the imaging operation of the imaging devices 2 and 3 I am waiting.

  In the first embodiment, video data is duplicated from the selected imaging device 1 and transmitted to the monitor 30. For example, since disturbance must not occur in video data used as live broadcasting, the same video data is duplicated and transmitted in order to increase tolerance to disturbance. As a result, when an abnormality occurs in the IP network and video data is lost in the transmission path, a compensation process (recovery process) is performed by using the video data of another transmission path to compensate for the loss. It can enhance resistance.

  On the other hand, since the imaging devices 2 and 3 which are not selected are in the selection standby state, there is no big problem even if the video data to be transmitted is missing. Therefore, the imaging device 2 outputs the video data to the transmission path 13 but does not output the video data to the transmission path 14. The imaging device 3 does not output the video data to the transmission path 15 but outputs the video data to the transmission path 16. As described above, compression of the transmission band of the IP network is prevented by transmitting image data from the imaging devices 2 and 3 not selected without duplicating the video data.

  Here, when the imaging device 1 is switched to the state in which the imaging device 2 is selected, the flow of video data changes as shown in FIG. In order to prevent loss of the main video data transmitted from the selected imaging device 2, the video data transmitted from the imaging device 2 is duplexed, and the same video data is transmitted on both the transmission path 13 and the transmission path 14 Do. Further, the imaging device 1 outputs the video data to the transmission path 11 but does not output the video data to the transmission path 12. The imaging device 3 does not output the video data to the transmission path 15 but outputs the video data to the transmission path 16.

  FIG. 4 is a flowchart showing transmission channel setting processing (main processing) by the monitor 30. The processor 62 starts transmission channel setting processing from S1000 in response to the monitor 30 being turned on. In S1001, the processor 62 reads the initial setting value from the memory 51. The initial setting value includes the channel number selected at the time of the past shutdown. The display unit 58 displays video data of the channel selected at the time of the past shutdown.

  In step S1002, the processor 62 transmits an instruction command to set the video output to be duplexed to the imaging device corresponding to the read channel number. Further, in S1003, the processor 62 transmits an instruction command for setting to not duplicate video output, to the imaging device corresponding to the channel number not selected. Specifically, one of two duplexed transmission paths is selected, and it is instructed to output video only to the selected one of the transmission paths. The distribution of transmission paths is performed so that the amount of data transmission of the transmission path 21 and the amount of data transmission of the transmission path 22 become substantially the same.

  At S1004, the processor 62 transmits the selected channel to the processor 60. The processor 60 sorts out the packets of the selected channel according to the instruction from the processor 62, whereby the function as a switcher is realized.

  Next, in S1005, the processor 62 stands by for a channel change instruction from the user. If the user instructs to change the channel, the process returns from S1005 to S1002, the duplex setting is performed for the newly selected channel, and the operations after S1003 are performed. Thus, the flow of the video data of FIG. 2 is changed to the flow of the video data of FIG.

  FIG. 5 is a flowchart for explaining the video data reception process. After the transmission channel setting process of FIG. 4 is performed, the processor 60 starts the video data reception process from S200. At S201, the processor 60 waits for packet reception. And if the notification which received the packet is received from LAN-IF40 and 41, a process will be advanced to S202. At S202, the processor 60 records the received packet in the memory 51. Next, in S203, the processor 60 performs data loss detection processing.

  For example, when video transmission is performed in the state shown in FIG. 2, the video data V1 is transmitted from the imaging device 1 through the transmission path 11 and the transmission path 21, and simultaneously transmitted from the imaging device 1 to the transmission path 12 The same video data V1 is transmitted via the path 22. The processor 60 causes the memory 51 to record the packet of the video data V1 received in duplicate.

  In S203, the processor 60 performs drop detection on a packet received via the transmission path 11 and the transmission path 21. Loss detection is performed by matching a packet ID with a predetermined communication procedure or using an error detection code. If a video data dropout has occurred, the process proceeds to S204, and the processor 60 extracts a packet corresponding to the dropout portion from the packet received via the transmission path 12 and the transmission path 22 and overwrites the dropout portion on the packet Perform complement processing. As a result, when video data is lost due to a disturbance, complementing the missing data improves the resistance to the disturbance.

  Next, in step S205, the processor 60 performs switcher processing for selecting video data of the selected channel. At S206, the processor 60 holds the video data of the selected channel in the memory 51. Also, in S207, the processor 60 discards the video data of the non-selected channel.

  By the above processing, the dropout complement processing of the received packet and the data selection function (switcher function) are realized, and the compressed video data is stored in the memory 51.

  FIG. 6 is a flowchart for explaining the decoding process of video data of a selected channel. The processor 61 starts the decoding process from S300. In S301, the processor 61 confirms the data accumulation state on the frame buffer in the memory 51. If there is a space in the data buffer, the process proceeds to step S302.

  In S302, the processor 61 obtains a packet of video data of a selected channel. Subsequently, in S303, the processor 61 decodes the acquired packet to obtain compressed video data. In S304, the processor 61 decompresses the compressed video data. In S305, the processor 61 writes the video data obtained by the decompression processing to the frame buffer in the memory 51. After that, the processor 61 returns to S301 and waits for data accumulation if the frame buffer is empty.

  By the above processing, the video data obtained by the decompression processing is recorded in the memory 51. Then, the video data read from the memory 51 by the DMAC 54 is transferred through the combination processing unit 56 and the video processing unit 57, and the display unit 58 performs video display, and an external broadcasting device via the output IF 59. It is output to 31.

  As described above, in the first embodiment, in the video transmission system using the IP network, the transmission video is controlled by controlling whether or not the transmission video is duplexed according to whether or not each imaging device is selected. It is possible to ensure the quality of the transmission and suppress the pressure on the transmission band.

Second Embodiment
FIG. 7 is a block diagram showing a configuration of a video transmission system according to a second embodiment. In this video transmission system, there are two monitors in the video transmission system and two switcher functions exist. An imaging device corresponding to the main video (main line video) to be broadcast is selected by the monitor 30, and an imaging device corresponding to the sub video in the broadcast standby state is selected by the monitor 32. The internal configuration of the monitor 32 is the same as the internal configuration of the monitor 30. Hereinafter, the same components as the components described in the first embodiment will be assigned the same reference numerals, and the detailed description thereof will not be repeated.

  FIG. 8 is a diagram for explaining the flow of video data in the video transmission system shown in FIG. In FIG. 8, when the imaging device 2 outputs video data of a main transmission channel used in live broadcasting, and the imaging device 3 outputs video data of a sub transmission channel on standby for use in live broadcasting. Shows the flow of video data.

  As shown in FIG. 8, the video data V 2 transmitted from the imaging device 2 selected as the main transmission channel to the monitor 30 is output to the broadcast device 31 and displayed on the display unit 58 of the monitor 30. Further, the video data V3 transmitted from the imaging device 3 selected as the sub transmission channel to the monitor 32 is displayed on the display unit of the monitor 32. At this time, since the video data V3 output from the imaging device 3 has a high possibility of being used in live broadcasting, it is on standby that the video data is switched while continuing the imaging operation of the imaging device 3.

  For example, since disturbance should not occur in the video data V2 used as live broadcasting, the same video data V2 is duplexed and transmitted in order to increase resistance to disturbance. Thus, when an abnormality occurs in the IP network and video data is lost in the transmission path, the video data of another transmission path can be used to compensate for the loss, thereby enhancing the resistance to disturbance. Since it is better not to cause disturbance in the video data V3 which is likely to be used next to the video data V2 as live broadcasting, the same video data V3 is similarly used in order to increase resistance to disturbance. Transmission is performed.

  On the other hand, since the imaging device 1 which has not been selected is in the selection standby state, there is no big problem even if the video data to be transmitted is missing. Therefore, the imaging device 1 outputs the video data to the transmission path 11 but does not output the video data to the transmission path 12. As described above, transmission of image data from the imaging device 1 not selected is not duplexed, thereby preventing compression of the transmission band of the IP network.

  FIG. 9 is a flowchart showing transmission channel setting processing by the monitors 30 and 32 in the second embodiment. First, the operation of the monitor 30 will be described. The processor 62 of the monitor 30 starts transmission channel setting processing (main processing) from S2000 in response to the power supply to the monitor 30 being turned on. In S2001, the processor 62 reads the initial setting value from the memory 51. The initial setting value includes the channel number selected at the time of the past shutdown. The display unit 58 displays video data of the channel selected at the time of the past shutdown.

  In step S2002, the processor 62 transmits an instruction command to set the video output to be duplexed to the imaging device corresponding to the read channel number. Further, in step S2003, the processor 62 transmits an instruction command for setting to not duplicate video output, to the imaging device corresponding to the channel number not selected. Specifically, one of two duplexed transmission paths is selected, and it is instructed to output video only to the selected one of the transmission paths. The distribution of transmission paths is performed so that the amount of data transmission of the transmission path 21 and the amount of data transmission of the transmission path 22 become substantially the same.

  For example, in the selection state shown in FIG. 8, an instruction command for duplex setting is transmitted to the imaging device 2 selected as the main transmission channel. Further, one of the pair of transmission paths is designated for the imaging device 1 and the imaging device 3 not selected as the main transmission channel, and an instruction to transmit an image to one of the transmission paths is transmitted. Data output to the transmission path 11 to the imaging device 1 and transmission path to the imaging device 3 so that the data transmission amount of the transmission path 21 and the data transmission amount of the transmission path 22 become substantially the same. Instructs data output for 16.

  At S2004, the processor 62 establishes a communication connection with the imaging devices 1, 2, 3 regarding the packet received by the monitor 30. The monitor 30 establishes communication connection via the transmission paths 13 and 14, the network hub 20, and the transmission paths 21 and 22 with the imaging device 2 selected as the main transmission channel. Thereby, the video data of the main transmission channel is duplexed and transmitted from the imaging device 2 to the monitor 30. The processor 62 transmits the selected channel to the processor 60. The processor 60 sorts out the packets of the selected channel according to the instruction from the processor 62, whereby the function as a switcher is realized.

  Next, in S2005, the processor 62 establishes communication connection via the transmission path 11, the network hub 20, and the transmission path 21 with the imaging device 1 not selected as the main transmission channel. Also, the processor 62 establishes communication connection via the transmission path 16, the network hub 20, and the transmission path 22 with the imaging device 3 not selected as the main transmission channel.

  Next, in S2006, the processor 62 waits for a channel change instruction from the user. If the user instructs to change the channel, the process returns from S2006 to S2002, duplexing setting is performed for the newly selected channel, and the operations after S2003 are performed.

  Next, the operation of the monitor 32 will be described. The flowchart is as shown in FIG. The monitor 32 selects the video output of the imaging device 3 and receives and displays the video data transmitted from the imaging device 3. The processor 62 of the monitor 32 starts transmission channel setting processing (main processing) from S2000 in response to the power supply to the monitor 32 being turned on.

  In the case of the selection state shown in FIG. 8, an instruction command for duplex setting is transmitted to the imaging device 3 selected as the sub transmission channel. Further, one of the pair of transmission paths is designated for the imaging device 1 and the imaging device 2 not selected as the sub transmission channel, and an instruction to transmit an image to one of the transmission paths is transmitted. The data output to the transmission path 11 is to the imaging device 1 and the transmission path 14 to the imaging device 2 so that the data amount of the transmission path 23 and the data amount of the transmission path 24 are substantially the same. Indicate data output.

  The imaging device 3 receives different instructions from the monitor 30 and the monitor 32. The monitor 30 instructs the imaging device 3 to not duplicate the video output, while the monitor 32 instructs the imaging device 3 to duplicate the video output. The imaging device 3 takes the logical sum of the respective instructions and outputs the output video data in duplicate.

  Next, in S2004, the processor 62 of the monitor 32 transmits the transmission paths 15 and 16, the network hub 20, and the transmission paths 23 and 24 to the imaging apparatus 3 selected as the sub transmission channel. Establish communication connection via Thereby, the video data of the sub transmission channel is duplexed and transmitted from the imaging device 3 to the monitor 32. The processor 62 transmits the selected channel to the processor 60. The processor 60 sorts out the packets of the selected channel according to the instruction from the processor 62, whereby the function as a switcher is realized.

  Next, in step S2005, the processor 62 establishes a connection via the transmission path 11, the network hub 20, and the transmission path 23 with the imaging device 1 not selected as the sub transmission channel. Further, the processor 62 establishes a connection via the transmission path 14, the network hub 20, and the transmission path 24 with the imaging device 2 not selected as the sub transmission channel.

  Next, in S2006, the processor 62 waits for a channel change instruction from the user. If the user instructs to change the channel, the process returns from S2006 to S2002, duplexing setting is performed for the newly selected channel, and the operations after S2003 are performed.

  As described above, in the second embodiment, when there are two switcher functions in the video transmission system using the IP network, even if the video output of the imaging apparatus different from each monitor is selected, each monitor The video output of the selected imaging device is duplicated. Therefore, even if there are two switcher functions, it is possible to ensure the quality of the transmission video and the transmission bandwidth by controlling whether or not the transmission video is duplexed depending on whether each imaging device is selected or not. It is possible to suppress the pressure of

  As a result, it is possible to realize a video transmission system that is resistant to disturbances and resistant to band excess.

Third Embodiment
In the third embodiment, a case will be described in which the imaging device 1 is selected as the main transmission channel and the imaging device 2 is selected as the sub transmission channel by the switcher function of the monitor 30. The internal configuration of the monitor 30 is as shown in FIG. 10 and 11 are diagrams for explaining the flow of video data in the video transmission system of the third embodiment. FIG. 10 is a diagram showing the flow of video data when the imaging devices 1 and 2 connected to the video transmission system are in the power-on state and the imaging device 3 is in the power-off state. FIG. 11 is a diagram showing the flow of video data when the imaging device 3 is changed to the power-on state from the state of FIG. The video data output from the imaging device 1 selected as the main transmission channel by the switcher function of the monitor 30 is transmitted to the broadcasting device 31 via the monitor 30 and used in live broadcasting. Further, the video data output from the imaging device 1 selected as the main transmission channel is displayed on the display unit 58 of the monitor 30 as the main video data. The video data output from the imaging device 2 as a sub transmission channel is reduced as sub video data by the switcher function of the monitor 30, and is combined with the main video data on the display unit 58 of the monitor 30 Picture is displayed. The sub video data may be used for live broadcasting next to the main video data, and is assumed to be in broadcast standby.

  In the state shown in FIG. 10, since there is room in the transmission band of the IP network, the output video of each of the two imaging devices 1 and 2 is duplexed and transmitted to the monitor 30. The monitor 30 is configured to be able to receive the outputs of the two imaging devices in duplicate. Since the output video of the imaging device 2 in the broadcast standby state is also duplicated and transmitted, the video data output from the imaging device 2 is lost at the moment when the output video of the imaging device 2 is selected as a live broadcast target Also, the missing part can be complemented (recovered).

  When the state shown in FIG. 10 is changed to the state shown in FIG. 11, the amount of data transmission in the video transmission system increases. In such a case, it is determined whether the amount of data transmission exceeds the maximum transmission capacity, and if it is determined that the maximum transmission capacity is exceeded, the duplication of the sub transmission channel is stopped and only the duplication of the main transmission channel is maintained. .

  FIG. 12 is a flowchart for explaining the duplexing setting change processing by the monitor 30. In order to increase the number of imaging devices that the user uses for imaging, the power of the imaging device 3 is turned on, and a communication connection is established between the imaging device 3 and the monitor 30. If the processor 62 of the monitor 30 detects an increase in imaging devices for which a communication connection has been established, it starts processing from S3000.

  In S3001, the total of the data transmission amount of the video data output from the imaging device 1, the imaging device 2, and the imaging device 3 is calculated. Then, in S3002, the processor 62 compares the calculated data transmission amount with the data transmission capacity of the transmission paths 21 and 22, and determines whether the total data transmission amount exceeds the maximum transmission capacity. If it is determined that the total of the data transmission amount exceeds the maximum transmission capacity, the process proceeds to S3003, and the processor 62 transmits an instruction command to stop duplexing of the video output to the imaging device 2 which is waiting for broadcast. Further, it instructs the imaging device 3 not selected by the switcher function of the monitor 30 to transmit the video output without duplication. If the processor 62 determines in S3002 that the total data transmission amount does not exceed the maximum transmission capacity, the processor 62 omits S3002 and ends the process.

  As described above, when it is determined that the total data transmission amount exceeds the maximum transmission capacity, image transmission can be performed while securing the transmission video quality of the main transmission channel by stopping duplication of the sub transmission channel. It is possible to suppress the compression of the transmission band of the system.

(Other embodiments)
Although the above-mentioned embodiment demonstrated the structure which controls the duplexing setting of the video output of each imaging device from the monitor side, it is not limited to this. Selection information indicating whether or not the own apparatus is selected may be received from the monitor side or the switcher apparatus side, and duplex setting of video output may be performed based on the information. Each imaging device performs duplex setting of video output when video data output by itself is selected by the monitor, and otherwise, performs setting to output video data without duplexing.

  The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. Can also be realized. The computer is configured by, for example, a processor such as a CPU or an MPU. It can also be implemented by a circuit (eg, an ASIC) that implements one or more functions. The computer program for realizing one or more functions of the above-described embodiments is also one of the present invention.

1, 2, 3 Imaging device (camera)
20 Network hub 30, 32 monitor (selected device)
31 Broadcast device

Claims (10)

A selection step in which the selection device selects at least one output device from a plurality of output devices capable of outputting image data in duplicate;
A control step which controls the video data from the selected output device to be duplexed and transmitted to the selection device, and does not control the video data from the non-selected output device to be duplexed and transmitted to the selection device And a video transmission method.   The video transmission method according to claim 1, wherein the control step performs control so that video data is transmitted from the non-selected output device to the selection device without being duplicated.   3. The video transmission method according to claim 1, wherein the output device is an imaging device that outputs video data obtained by imaging.   The video transmission method according to any one of claims 1 to 3, further comprising the step of transmitting the video data transmitted from the selected output device to the selection device to another device.   In the selection step, when the selection device selects two or more output devices from the plurality of output devices, the control step is performed by duplicating video data from each of the two or more selected output devices and the selection device The video transmission method according to any one of claims 1 to 4, wherein the video transmission method is controlled so as to be transmitted.   In the control step, when it is determined that the total of the video data to be transmitted exceeds the maximum transmission capacity, the video data is not duplicated from the output device of any of the two or more selected output devices. The video transmission method according to claim 5, wherein the video transmission method is controlled to be transmitted to the device.   The video transmission method according to any one of claims 1 to 6, wherein the plurality of output devices and the selection device are connected by an IP (Internet Protocol) network.   The program for making a computer perform each step of the image | video transmission method of any one of Claims 1-7. A video transmission system comprising: a plurality of output devices capable of outputting video data in duplicate; and a selection device for selecting at least one output device from the plurality of output devices,
Control is performed such that video data is duplicated from an output device selected by the selection device and transmitted to the selection device, and video data is duplicated from an output device not selected by the selection device and transmitted to the selection device A video transmission system comprising control means which is not controlled to be controlled. A selection device for selecting at least one output device from a plurality of output devices capable of outputting image data in duplicate and outputting the same.
Control such that video data is duplicated from the selected output device and transmitted to the selection device, and control is not performed such that video data is duplicated from the non-selected output device and transmitted to the selection device Means for selecting.

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