JPH09182056A - Video data transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely select many cameras dispersed in plural transmission display processing parts and to display the video, without increasing the transmission capacity of a transmission line, up to necessary capacity or more. SOLUTION: In this system, a reception/retransmission means 23 having a function retransmitting a digital video signal which is being received, a request means 25 requesting the transmission of a pertinent digital video signal for a video display processing part 3 performing a notification in response to an inquiry are provided on the video display processing part 3, and a storage means 15 storing its own transmission capacity, the transmission destination of the digital video signal which is being transmitted and use transmission capacity is provided. As a result, a video transmission processing part 2 is made to have a decision means 22 replying the decision result of the transmission propriety of the digital video signal based on the stored data or the transmission destination of the digital video signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video data transmission system used in a surveillance system for remotely monitoring an image input from a camera or the like, and particularly to digitizing an input image and converting the digital image signal into a digital image signal. The present invention relates to a video data transmission system capable of being sent to a video display device arranged at a plurality of points via a transmission path for display.

[0002]

2. Description of the Related Art FIG. 13 is a system configuration diagram showing a configuration of a conventional video data transmission system, showing an application example to a remote image monitoring system. In the figure, 1 is a camera for photographing the surveillance site, and 2 is a video transmission processing unit for digitizing and transmitting the input video from the camera 1. Reference numeral 3 is a video display processing unit that receives the digital video signal and performs display processing, 4 is a video display device that displays the display-processed video, and 5 is each of these video transmission processing units 2
And a video display processing unit 3 are connected to each other.
Further, in the video transmission processing unit 2, 11 is a camera input unit for processing a video signal input from the camera 1, 12 is a transmission line interface unit for interfacing with the transmission line 5, and in the video display processing unit 3. In the figure, 13 is a transmission line interface unit that interfaces with the transmission line 5, and 14 is a display device interface unit that interfaces with the video display device 4.

Next, the operation will be described. The image display processing unit 3 is usually installed in the monitoring center, and there is a monitoring person there. The camera 1 at the point you want to monitor
The corresponding video transmission processing unit 2
Issue a video transmission request to. The video sending processing unit 2 processes the video signal input from the camera 1 and sends the digital video signal to the video display processing unit 3 via the transmission path 5. The video display processing unit 3 performs display processing on the received digital video signal,
A desired image is displayed on the image display device 4.

Here, when there is one monitoring center as shown in the figure, the video signal captured by the camera 1 passes through the transmission line 5 without any problem and the video display processing section 3 of the monitoring center is used.
However, when there are a plurality of monitoring centers, it is difficult to monitor the video signals captured by the same camera 1 at a plurality of monitoring centers. It is possible to handle the video transmission processing units 2 by connecting the video transmission processing units 2 to the monitoring centers (the video display processing units 3) so as to connect the video transmission processing units 2 to a plurality of monitoring centers. If there are 10 monitoring centers, it is necessary to prepare 10 transmission processing circuits in each video transmission processing unit 2.

Further, as used in a CATV system or the like, video can be multiplexed and transmitted, and each video transmission processing unit 2 occupies one video channel of the transmission line 5, and the number of video transmission processing units 2 is equal to the number of video transmission processing units 2. If the transmission path 5 having the number of channels can be prepared, the plurality of video display processing units 3 connected to this CATV system can select the video image taken by the desired camera 1 only by channel selection. However, in such a surveillance system, the surveillance camera 1 has 100
When it becomes a large scale that exceeds the number of units, the number of channels becomes too large to be realistic.

Further, in the case where the capacity of the transmission line 5 connecting the video transmission processing unit 2 to the transmission line 5 has a margin, FIG.
By processing according to the procedure shown in the flowchart of 4, it is possible to transfer the video signals captured by the same camera 1 to the plurality of video display processing units 3. That is, in step ST1, the video transmission processing unit 2 to which the camera 1 at the point to be monitored is connected is inquired whether new video can be transmitted, and in step ST2 it is determined whether or not transmission is possible. If the transmission is possible, in step ST3, the transmission of the digital video signal is started to the video transmission processing unit 2, and the video based on the digital video signal transmitted in step ST4 is displayed on the video display device 4. On the other hand, when it is determined that the transmission line 5 is already used up to its maximum transmission capacity and cannot be transmitted, the process proceeds to step ST5 and waits until the transmission line 5 has a margin.

[0007]

Since the conventional video data transmission system is configured as described above, the video signals taken by the plurality of cameras 1 distributed in the plurality of video display processing units 3 are used. Are selected independently to display on the video display device 4, each video display processing unit 3
If the same number of transmission processing circuits as those in the video transmission processing section 2 are prepared, the device configuration becomes extremely redundant,
If one video channel is assigned to each video transmission processing unit 2, the number of channels becomes too large and unrealistic in a large-scale system in which the number of surveillance cameras 1 exceeds 100. By using the margin of the transmission capacity of the transmission path 5, when it is desired to simultaneously view the images taken by the same camera 1 at a large number of monitoring centers, the probability that the transmission path 5 is in a standby state when the transmission capacity is small. There was a problem such as high cost.

The present invention has been made to solve the above problems, and allows a large number of cameras dispersed by a plurality of transmission display processing units to be freely arranged without increasing the transmission capacity of the transmission line more than necessary. The object is to obtain a video data transmission system capable of selecting and displaying the video.

It is another object of the present invention to provide a video data transmission system capable of selectively reproducing and displaying even a temporarily stored video.

[0010]

According to a first aspect of the present invention, there is provided a video data transmission system, wherein the video display processing section has a receiving / sending means having a function of retransmitting a digital video signal while receiving the digital video signal. , A request means for requesting the transmission of the corresponding digital video signal is provided to the video display processing unit that is notified to the inquiry when the new transmission of the digital video signal being transmitted cannot be performed, The video transmission processing unit stores the transmission capacity of itself, the transmission destination of the digital video signal currently being transmitted and the used transmission capacity, and whether or not the digital video signal can be transmitted based on the data stored in the storage unit. It is provided with a judging means for replying the judgment result or the destination to which the digital video signal is transmitted.

In the video data transmission system according to the second aspect of the present invention, the digital video signal simultaneously transmitted to the plurality of video display processing units by the transmission means is only the digital video signal of the currently input video. Is.

According to a third aspect of the present invention, there is provided the video data transmission system, wherein the video transmission processing section is provided with a video storage means for temporarily storing the input video, and the transmission history of the stored video is stored in the storage means. Based on the above, the function of answering the determination result of whether or not to transmit the stored video and the destination of the stored video is added to the determination means, and the video display processing unit temporarily stores the received stored video. When,
A storage means for storing the transmission source of the stored video is provided to request the transmission of the stored video to the transfer destination of the stored video notified from the video transmission processing unit in response to the inquiry when the transmission of the stored video is impossible. This function is added to the requesting means, and the function of reading out the requested stored video from the video storing means and sending it to the transmission path is added to the receiving / retransmitting means.

According to a fourth aspect of the present invention, there is provided a video data transmission system in which a transmission line management unit is connected to a transmission line so that the transmission capability of each video transmission processing unit and each video transmission processing unit are currently transmitting. Storage means for storing the transmission destination of the digital video signal and its used transmission capacity, and a determination result as to whether or not the digital video signal can be transmitted based on the data stored in the storage means in response to an inquiry from the video display processing section, and The digital video signal is provided with a judging means for answering the destination to which the digital video signal is currently sent, and the video sending processing section is provided with a notifying means so that the digital video signal currently being sent and the transmission used therefor are provided. The capacity is notified to the transmission path management unit, and the inquiry means of the video display processing unit inquires of the transmission path management unit whether or not the digital video signal can be transmitted. That.

In the video data transmission system according to the fifth aspect of the present invention, the maximum transmission capacity of the transmission line to which the video transmission processing unit is connected is used as the transmission capacity when determining whether or not the digital video signal can be transmitted. It is a thing.

In the video data transmission system according to the invention of claim 6, the maximum processing capacity of the video transmission processing unit is used as the transmission capacity when judging whether or not the digital video signal can be transmitted.

In the video data transmission system according to the seventh aspect of the present invention, the inquiring means is to another video display processing section,
A video display responding that the digital video signal is being received from the video transmission processing unit with the input of the desired input video, and the request means responds that the corresponding digital video signal is being received as a result of the inquiry. The processing unit is requested to send out a digital video signal.

In the video data transmission system according to the present invention, if there is no video display processing unit which is receiving the digital video signal of the desired input video, the digital video signal is sent to the video sending processing unit. The request function is added to the request means.

According to a ninth aspect of the present invention, there is provided a video data transmission system, wherein the video transmission processing section has a video storage means for temporarily storing the input video, and the video display processing section has a video storage means for temporarily storing the received storage video. And a storage means for storing the transmission source of the stored video, and the requesting means is provided with a function for inquiring the other video display processing section of the inquiring means about whether or not a desired stored video is stored. As a result of the inquiry, if there is a response indicating that the image is stored, a function for requesting transmission of the stored image is added to the image display processing unit.

According to the tenth aspect of the invention, the video data transmission system has a function of, if there is no video display processing section accumulating a desired accumulated picture, requesting the picture transmission processing section to transmit the accumulated picture. Is added to the requesting means.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a system configuration diagram showing the configuration of a video data transmission system according to the first embodiment, and in this case also shows an application example to a remote image monitoring system. In the figure, reference numeral 1 is a camera for photographing a surveillance site and inputting a video signal, and 2 is a video transmission processing section for receiving an input video from the camera 1, digitizing it, and transmitting the digital video signal. Reference numeral 3 is a video display processing unit that receives and processes the digital video signal sent from the video sending processing unit 2, and 4 is the video display processing unit 3.
Is a video display device that displays a video obtained by displaying and processing a digital video signal. Reference numeral 5 denotes a transmission line to which the respective video transmission processing units 2 and the respective video display processing units 3 are connected. This transmission line 5 is a multimedia-compatible device capable of transmitting digital video signals and various code data in a mixed manner. Or two types of transmission paths for digital video signal transmission and various code data transmission may be laid in parallel.

In the video transmission processing unit 2, reference numeral 11 is a camera input unit for digitizing a video signal input from the camera 1 and converting it to enable digital transmission, and 12 is converted to the transmission line 5. It is a transmission path interface unit that sends out the generated digital video signal and performs communication processing for various requests from the transmission path 5. In the video display processing unit 3, 13 is a transmission line interface unit for receiving and processing digital video signals from the transmission line 5 and exchanging various control information, and 14 is a digital image received and processed by the transmission line interface unit 13. It is a display device interface section for displaying a signal on the video display device 4. It should be noted that the above-mentioned respective parts are parts corresponding to those in the conventional video data transmission system shown by attaching the same reference numerals in FIG.

In the video transmission processing section 2, 15
Stores the maximum transmission capacity of the transmission path 5 to which the video transmission processing unit 2 is connected as the transmission capability of the video transmission processing unit 2, and the destination of the digital video signal currently transmitted by the video transmission processing unit 2 and The storage means stores the transmission capacity used for that purpose. Further, in the transmission path interface unit 12 in the video transmission processing unit 2, a transmission 21 is capable of simultaneously transmitting the digital video signal converted by the camera input unit 11 to a plurality of video display processing units 3. Reference numeral 22 denotes means for receiving a query from the video display processing unit 3 and referring to the data stored in the storage unit 15 to determine whether or not a new digital video signal can be transmitted, or a corresponding digital video signal. Is a determination means for notifying the video display processing unit 3 currently being sent.

Further, in the transmission path interface section 13 of the video display processing section 3, 23 receives the digital video signal from the transmission path 5 and at the same time receives the digital video signal being received in response to the request. It is a reception / retransmission means having a function of re-transmitting to the. When a user wants to display an image of a certain monitoring point on the image display device 24, the reference numeral 24 indicates to the image transmission processing unit 2 which is processing the input image from the camera 1 photographing the monitoring point, It is an inquiry means for inquiring whether or not a new digital video signal being sent can be sent, and when the digital video signal cannot be sent, to which video display processing unit 3 the digital video signal is currently sent. Reference numeral 25 is a requesting means which is notified in response to the inquiry by the inquiry means 24 and requests the video display processing section to which the digital video signal is currently sent, to send the corresponding digital video signal. .

Next, the operation will be described. Here, FIG.
FIG. 3 is an explanatory diagram showing a flow of information in the video data transmission system shown in FIG. 1, and FIG. 3 is a flowchart showing a procedure of its operation. Here, as shown in FIG. 2, the identification codes #A to #N and the identification codes # 1 to #n are assigned to the video transmission processing units 2 and the video display embedding units 3, respectively. ing. Now, the video transmission processing unit 2 of #A
It is assumed that the digital video signals are being sent to the video display embedding units 3 of # 1 and # 2 on the paths indicated by solid lines a and b in FIG. In such a case, that effect is recorded in the storage means 15. That is, the identification codes # 1 and # 2 of the video display embedding unit 3 which is transmitting the digital video signal are recorded in the transfer destination area of the storage means 15, and are used in the transmission capacity areas. Transmission capacity is 10 Mb
ps and 15 Mbps are recorded. In addition to the storage means 15, the maximum transmission capacity 10 that can be transmitted through the transmission path 5 to which the video transmission processing section 2 is connected is provided.
0 Mbps is also recorded in the area of the maximum transmission capacity.

At this time, consider a case where the #n video display processing unit 3 requests the #A video transmission processing unit 2 to transmit a digital video signal. That is, step ST in FIG.
In FIG. 11, the inquiry means 24 makes a new connection to the video transmission processing unit 2 of #A to which the camera 1 which is photographing the desired monitoring point is connected, by the route indicated by the chain line c in FIG. Inquires whether a proper digital video signal can be sent. #
In step ST12, the video transmission processing unit 2 of A
The determination means 22 reads out the transmission capacity currently used for transmitting the digital video signals from the storage means 15 to the # 1 and # 2 video display processing units 3, and calculates the sum of them and the transmission path 5 read out from the storage means 15. The maximum transmission capacity is compared to determine whether or not new transmission of the digital video signal is possible, and the determination result is reversed to the path indicated by the one-dot chain line c and the image display processing of #n is performed. Return to Part 3.

In the illustrated example, the total transmission capacity in use is 2
Since the transmission path 5 of the video transmission processing unit 2 of #A having a maximum transmission capacity of 100 Mbps has a sufficient margin, it is determined that the transmission is possible. Therefore, the process proceeds to step ST13, and the request means 25 starts the transmission of the digital video signal to the video transmission processing unit 2 of #A by the route shown by the one-dot chain line c in FIG. As a result, the digital video signals transmitted from the #A video transmission processing unit 2 to the # 1 and # 2 video display processing units 3 are
It is transmitted from the transmission means 21 to the image display processing unit 3 of #n through the route shown by the solid line d in FIG. In step ST14, the video display processing unit 3 of #n receives the digital video signal by the receiving / retransmitting means 23, processes it by the display device interface unit 14, and displays it on the video display device 4.

On the other hand, the transmission line 5 of the video transmission processing section 2 of #A
If there is no margin, it is determined that transmission is impossible, and the process proceeds to step ST15. In step ST15, which video display processing unit 3 the digital video signal is being sent from the inquiry means 24 of the #n video display processing unit 3 to the #A video transmission processing unit 2 is determined. Contact us. #A
The determination means 22 of the video transmission processing unit 2 refers to the storage means 15 and determines that the destinations of the desired digital video signals are # 1 and #.
It is confirmed that it is the video display processing unit 3 of No. 2 and #n
To the video display processing unit 3. It should be noted that the exchange of this signal is also performed by the route shown by the one-dot chain line c in FIG.

In step ST16, the #n video display processing section 3 that has received the notification sends a digital video signal from the request means 25 to the target video display processing section 3, for example, # 2 video display processing section 3. To re-send.
This digital video signal transfer request is indicated by the alternate long and short dash line e in FIG.
It is performed by the route shown by. In step ST16, the # 2 video display processing unit 3 that has received the transfer request retransmits the digital video signal currently being received by the reception / retransmission unit 23 to the #n video display processing unit 3. This digital video signal is sent to and received by the video display processing unit 3 of #n via the path indicated by the broken line f in FIG. 2 and displayed on the video display device 4. If the image display processing unit 3 of # 2 cannot transfer the digital image signal being received for some reason and there is no other image display processing unit 3 that can be transferred, the image transmission processing unit 2 of #A in step ST17. It waits until the digital video signal from can be received.

As described above, according to the first embodiment,
Even if the transmission path 5 of the #A video transmission processing unit 2 does not have a margin, the desired digital video signal can be transferred from the # 2 video display processing unit 3 or the like. Compared to the illustrated video data transmission system that does not have a conventional transfer mechanism, there is an effect that the probability of waiting until the transmission path 5 has a margin can be significantly reduced.

Embodiment 2 FIG. In the first embodiment described above, the digital video signal of the input video captured by the camera 1 is transmitted only in real time. However, in the video data transmission system of the first embodiment, the video of the camera 1 is transmitted. Since it was not temporarily stored, it suffices to manage only the desired camera number. However, when the monitoring target becomes abnormal, the input image of the camera 1 is stored in the image storage means on the side of the image transmission processing unit 2 and the stored image is stored in response to the request from the image display processing unit 3 side. It is a little complicated in a video data transmission system that can also send the. It goes without saying that the video data transmission system of the present invention can be applied to such a system.

FIG. 4 is a system configuration diagram showing the configuration of the video data transmission system according to the second embodiment. In the figure, reference numeral 16 is a video storage unit provided in each video transmission processing unit 2 for temporarily storing a digitized input video imaged by the camera 1 and input-processed by the camera input unit 11. Reference numeral 17 denotes a video storage unit provided in each video display processing unit 3 for temporarily storing the video stored in the video storage unit 16 transferred from the video transmission processing unit 2, and 18 also displays each video. The storage unit is provided in the processing unit 3 and stores attribute information such as a transmission source of the stored video stored in the video storage unit 17. In addition,
The storage unit 15 in the video transmission processing unit 2 is the video storage unit 1.
This is different from that in the first embodiment in which the same reference numerals are assigned in FIG. 1 in that the history of transfer of the accumulated video accumulated in 6 to each video display processing unit 3 is also stored.

Further, in the transmission path interface section 12 of each video transmission processing section 21, reference numeral 21 is a transmission means and 22 is a determination means. It differs from those in Form 1. That is, the transmission means 21 has a function of transmitting not only the input video digitized by the camera input section 11 but also the stored video stored in the video storage means 16 to the video display processing section 3 in response to a request. There is. Also,
When there is an inquiry, the determination means 22 refers to the storage means 15, confirms the destination of the corresponding accumulated video based on the history data stored therein, and notifies the inquired video display processing unit 3 of it. It has a function.

Similarly, in the transmission path interface section 13 of each video display processing section 3, 23 is a receiving / retransmitting means,
Reference numeral 24 is an inquiry means, and reference numeral 25 is a requesting means, which are different from those in the first embodiment shown in FIG. That is, the reception / retransmission unit 23 has a function of reading the corresponding stored video from the video storage unit 17 and sending it to the video display processing unit 3 in response to a request to send the stored video from the other video display processing unit 3. ing. The inquiring means 24 has a function of inquiring, with respect to the video transmission processing unit 2 that stores the desired accumulated video, whether or not the accumulated video can be transmitted and the transfer destination of the accumulated video, and the video transmission in response to the inquiry. It has a function of inquiring from the processing unit 2 to the video display processing unit 3 to which the stored video is transferred whether or not the stored video is still stored. Requesting means 25
Responds to the inquiry by the inquiry means 24 and requests the video display processing unit 3 which has answered that the corresponding accumulated video is stored in the video storage means 17 to send the stored video. Is equipped with.

Since the other portions are the same as those in the first embodiment denoted by the same reference numerals in FIG. 1, the description thereof will be omitted.

Next, the operation will be described. Here, FIG.
6 is an explanatory diagram showing a flow of information in the video data transmission system shown in FIG. 4, and FIG. 6 is a flowchart showing a procedure of the operation. Now, it is assumed that the video transmission processing unit 2 of #A is transmitting digital video signals to the video display processing unit 3 of # 1 and # 2 through the paths shown by solid lines a and b in FIG. The video transmission processing unit 2 of #A also transfers the stored video from the video time 8:07 among the stored video stored in the video storage unit 16 to the video display processing unit 3 of # 2.
It is assumed that the accumulated video from 10:13 has already been sent to the video display processing unit 3 of # 6. In such a case, the storage means 15 stores the identification codes # 1 and # 2 of the video display embedding unit 3 which is the destination of the current input video, the transmission capacities of 10 Mbps and 15 Mbps, and the maximum transmission capacity of 100 Mbps. At the same time, the identification codes # 2 and # 6 of the video display embedding unit 3 that sent the stored video stored in the video storage unit 16 and the video times 8:07 and 10:13 of the stored video sent to each are recorded. Has been done. In addition, the video time 8: 0 transferred from the video transmission processing unit 2 of #A is stored in the storage unit 18 of the video display processing unit 3 of # 2.
It is recorded that the accumulated image from No. 7 and the accumulated image from the image time 9:15 transferred from the image transmission processing unit 2 of #D are accumulated in the image accumulation means 17.

At this time, consider a case where the #n video display processing unit 3 requests the #A video transmission processing unit 2 to transmit the stored video at the video time 8:07. That is, in step ST21 of FIG. 6, it is inquired of the #A video transmission processing unit 2 that stores the desired stored video in the video storage means 16 whether or not the stored video can be sent. Means 24
More inquiries are made by the route shown by the one-dot chain line c in FIG.
In step ST22, the video transmission processing unit 2 of #A determines whether or not the stored video can be transmitted based on the data stored in the storage unit 15, and the determination result is the video of #n, as in the case of the first embodiment. It is returned to the display processing unit 3. If the transmission path 5 has a sufficient margin, it is determined that the transmission is possible, the transmission of the accumulated video from the video time 8:07 is started in step ST23, and the accumulated video from the video time 8:07 is started in step ST24. Is transmitted to the video display processing unit 3 of #n through the path indicated by the solid line d in FIG. 5 and displayed on the video display device 4.

On the other hand, the transmission path 5 of the video transmission processing section 2 of #A
If there is no margin, it is determined that transmission is impossible, and the process proceeds to step ST25. In step ST25, the video display processing unit in which the accumulated video from the video time 8:07 is transferred from the inquiry means 24 of the video display processing unit 3 in #n to the video transmission processing unit 2 in #A. 3 is inquired, and the determination means 22 of the #A video transmission processing section 2 refers to the storage means 15 and confirms that the stored video has been transferred to the # 2 video display processing section 3. The #n video display processing unit 3 is notified by the route indicated by the alternate long and short dash line c. In step ST26, the #n video display processing unit 3 that has received the notification receives the # 2 video display processing unit 3 from the inquiry means 24.
Is inquired as to whether or not the accumulated image from this image time 8:07 is still accumulated in the image accumulation means 17. This inquiry is made by the route shown by the one-dot chain line e in FIG. In step ST27, the image display processing unit 3 of # 2 refers to the storage unit 18 to determine whether or not the inquired accumulated image is still accumulated in the image accumulating unit 17, and the determination result is the one-dot chain line. On the contrary, the route indicated by e is returned to the video display processing unit 3 of #n.

In the example shown in the figure, since the accumulated image from the image time 8:07 transferred from the image transmission processing unit 2 of #A is still accumulated in the image accumulation means 17, the judgment result is accumulation Proceeds to step ST28. Step S
At T28, the requesting means 25 of the #n video display processing section 3 activates the transmission of the stored video to the # 2 video display processing section 3 through the route indicated by the alternate long and short dash line e. In step ST24, the # 2 video display processing unit 3 reads the stored video from the video time 8:07 by the reception / retransmission unit 23, and the #n video display processing unit 3 follows the path indicated by the broken line f in FIG. To transmit. If the result of determination in step ST27 is that there is no accumulation, the process returns to step ST25 to make an inquiry about another image display processing unit 3 to which the accumulated image has been transferred.

When another video display processing unit 3 is notified by the video transmission processing unit 2 of #A, the processes from step ST26 onward are repeated. If there is no other video display processing unit 3 to which the stored video is transferred, step ST2.
In step 9, the process waits until the stored image can be received from the #A image transmission processing unit 2.

Since the transfer of the input image currently taken by the camera 1 is the same as in the case of the first embodiment, its explanation is omitted here.

As described above, according to the second embodiment,
The stored video stored in the video storage means 16 of the video transmission processing unit 2 can also be transferred from the video display processing unit 3 of the transmission destination, so that the probability of waiting until the transmission path 5 has a margin is greatly increased. There is an effect that can be reduced.

Embodiment 3. In the above-described first embodiment, the case where the destinations of the input images captured by the camera 1 are managed by the respective image transmission processing units 2 has been described.
Even if each video transmission processing unit 2 does not manage individually, a transmission path management unit is provided in this video data transmission system, and the transmission status of the input video is centrally managed by this transmission path management unit. Good.

FIG. 7 is a system configuration diagram showing the configuration of the video data transmission system according to the third embodiment. The same parts as those in the first embodiment are designated by the same reference numerals as those in FIG. 1 and their description is omitted.
In the figure, reference numeral 6 denotes the above-mentioned transmission line management unit which is connected to the transmission line 5 and manages the transmission status. In the transmission path management unit 6, reference numeral 26 stores the maximum transmission capacity of the transmission path 5 to which each video transmission processing unit 2 is connected as the transmission capacity of each video transmission processing unit 2 and the transmission of each video. The processing unit 2 is a storage unit that stores the destination of the digital video signal currently being transmitted and the transmission capacity used for the transmission. Further, reference numeral 27 denotes a result of determination as to whether or not a new digital video signal can be transmitted based on the data stored in the storage means 26 when an inquiry is made from the inquiry means 24 of the video display processing section 3, or the corresponding result. It is the judging means 27 for notifying the video display processing unit 3 that has made an inquiry of the video display processing unit 3 to which the digital video signal is being sent.

In the video display processing unit 3, 24
Is an inquiry about the availability of new transmission of the digital video signal being transmitted and the destination to which the digital video signal is currently being transmitted in the video transmission processing unit 2 to which the desired input video is input. In that the transmission path management unit 6 is executed instead of the transmission processing unit 2,
The inquiry means is different from that of the first embodiment shown in FIG. Further, in the video transmission processing unit 2, reference numeral 28 indicates the transmission destination of the digital video signal currently transmitted by the transmission means 21 of the video transmission processing unit 2 and the transmission capacity used for the transmission path management unit 6. Is a notification means 28 for notifying the user.

Next, the operation will be described. Here, FIG.
FIG. 9 is an explanatory diagram showing the flow of information in the video data transmission system shown in FIG. 7, and FIG. 9 is a flowchart showing the procedure of its operation. Now, it is assumed that the #A video transmission processing unit 2 is transmitting digital video signals to the # 1 and # 2 video display embedding units 3 through the paths indicated by solid lines a and b in FIG. In such a case, the information regarding the transmission of the digital video signal is sent to the transmission path management unit 6 through the path indicated by the chain double-dashed line c in FIG. 8 and recorded in the storage means 26. That is, the video transmission processing unit 2 which is transmitting the digital video signal to the transfer source area of the storage means 26.
Identification code #A is recorded in the transfer destination area, and the identification codes # 1 and # 2 of the image display embedding unit 3 receiving the same are recorded in the transfer destination area. The recorded transmission capacity is recorded as 10 Mbps and 5 Mbps. The storage means 26 also records information (#B, # 2, 10 Mbps, etc.) relating to the digital video signal transmitted from the video transmission processing section 2 other than the storage means 26. Further, in the storage means 26, the maximum transmission capacity (100 Mbps, 50 Mbps, 150 Mbps, etc.) that can be transmitted through the transmission path 5 of each video transmission processing unit 2 is the transmission source (#A, #B, #C, etc.). It is recorded in correspondence with.

At this time, consider a case where the #n video display processing unit 3 requests the #A video transmission processing unit 2 to transmit a digital video signal. That is, step ST in FIG.
In FIG. 31, the image of #A in which the camera 1 photographing the desired monitoring point is connected from the inquiry means 24 to the transmission path management unit 6 through the path indicated by the one-dot chain line d in FIG. The sending processing unit 2 inquires whether a new digital video signal can be sent. In the transmission path management unit 6, step ST32
At the determination means 27, the determination means 27 determines whether or not a new digital video signal can be transmitted based on the data recorded in the storage means 26, and the determination result is reversed to the path indicated by the one-dot chain line d and the image of #n is reversed. It is returned to the display processing unit 3. The above determination is performed in the same manner as in the first embodiment.

If there is a sufficient margin as in the illustrated example, it is determined that the data can be transmitted, and the requesting means 2 is issued in step ST33.
5, the path indicated by the alternate long and short dash line e in FIG.
The video transmission processing unit 2 is required to transmit a digital video signal. As a result, the transmission means 21 of the #A video transmission processing unit 2 transmits the digital video signal to the #n video display processing unit 3 through the route shown by the solid line f in FIG.
At that time, in step ST34, the video transmission processing section 2 of #A sends the data relating to the transfer of the digital video signal to the transmission path management section 6 via the path of the chain double-dashed line c and records it in the storage means 26. Let In step ST35, the image display processing unit 3 of #n receives the digital image signal by the reception / retransmission unit 23 and displays the image on the image display device 4.

On the other hand, if the #A video transmission processing unit 2 determines that a new digital video signal cannot be transmitted, the process proceeds to step ST36. In step ST36, #
Which video display processing unit 3 is transmitting the digital video signal from the video transmission processing unit 2 of #A to the transmission path management unit 6 from the inquiry means 24 of the video display processing unit 3 of n. To inquire. Judgment means 27 of the transmission line management unit 6
Refers to the storage means 26 and confirms that the destinations of the digital video signals transmitted from the #A video transmission processing unit 2 are the video display processing units 3 of # 1 and # 2.
The video display processing unit 3 of n is notified. It should be noted that the transmission and reception of this signal is also performed by the route shown by the one-dot chain line d in FIG.

In step ST37, the requesting means 25 of the #n image display processing unit 3 receives the notification and digitally sends it to the # 2 image display processing unit 3 along the route indicated by the alternate long and short dash line g in FIG. Request re-sending of video signal. The reception / retransmission unit 23 of the # 2 video display processing unit 3 that has received the transfer request retransmits the currently received digital video signal to the #n video display processing unit 3. This digital video signal is sent to and received by the video display processing unit 3 of #n through the path indicated by the broken line h in FIG. 8 and displayed on the video display device 4. In addition,
If the video display processing unit 3 of # 2 cannot transfer the digital video signal being received for some reason and there is no other video display processing unit 3 that can be transferred, in step ST38 #A
It waits until the digital video signal from the video transmission processing unit 2 can be received.

As described above, according to the third embodiment,
Since the storage unit 15 and the determination unit 22 of the video transmission processing unit 2 are centrally arranged at one place, the consistency of the stored data is higher than that in the case where the storage unit 15 is dispersedly arranged in each video transmission processing unit 2. It is easy to take, and further, the configuration of the video transmission processing unit 2 can be simplified, and the system can be constructed at low cost.

Embodiment 4 FIG. Embodiments 1 and 2 above
Then, the video transmission processing unit 2 to which the camera 1 is connected determines whether or not it is possible to transfer the input video captured by the camera 1 capturing the desired monitoring point, or the accumulated video temporarily accumulating the input video. Although the case of inquiring has been described, the other image display processing unit 3 may be inquired of whether or not a desired image is received from the image transmission processing unit 2 and whether or not the desired image can be transferred. Of course, the same effects as those of the first and second embodiments are obtained.

FIG. 10 is a system configuration diagram showing the configuration of such a video data transmission system according to the fourth embodiment of the present invention. The same parts as those in the second embodiment are designated by the same reference numerals as those in FIG. 4 and their description is omitted. In the figure, reference numeral 29 is provided in each video display processing section 3 and, in response to an inquiry from the inquiry means 24 of another video display processing section 3, whether or not a corresponding digital video signal is being received, And the response means 29 for answering whether or not the corresponding stored video is stored in the video storage means 17.

In the video display processing unit 3, 24
Is whether or not the desired video transmission processing unit 2 is receiving the digital video signal of the input video currently being transmitted, and whether or not the desired stored video is stored in the video storage means 17,
In addition, an inquiry different from the one with the same reference numeral in FIG. 4 in that each of the video display processing units 3 is inquired regarding whether or not a new digital video signal of the input video or the stored video can be transmitted. It is a means. Further, 25 in the video display processing unit 3 is receiving the corresponding digital video signal or accumulating the corresponding accumulated video as a result of the inquiry by the inquiry means 24, and it is possible to newly transmit them. It is possible to request the transfer of these to the video display processing unit 3 that has answered, and receive the corresponding digital video signal, or store the corresponding accumulated video, and transmit them newly. If there is no video display processing unit 3 that has answered, there is a requesting means different from the one denoted by the same reference numeral in FIG. 4 in that the corresponding video transmission processing unit 2 is requested to transfer them. Is.

Next, the operation will be described. Here, FIG.
1 is an explanatory diagram showing the flow of information in the video data transmission system shown in FIG. 10, and FIG. 12 is a flow chart showing the procedure of its operation. Now, the video transmission processing unit 2 of #A uses the routes indicated by solid lines a and b in FIG.
A digital video signal is being sent to the video display embedding unit 3 of No. 2 and the video time of 8:
It is also assumed that the accumulated video from 07 has already been transmitted through the route shown by the solid line c in the figure. At this time, consider a case where the #n video display processing unit 3 requests the #A video transmission processing unit 2 to transmit a digital video signal. The contents of the storage means 15 in that case are as shown in FIG. 11 as described in the second embodiment.

First, in step ST41 of FIG.
From the inquiry means 24 of the #n video display processing unit 3 to the other video display processing unit 3, the #A video transmission processing unit 2 to which the camera 1 capturing the desired monitoring point is connected. Queries whether or not the digital video signal currently being transmitted is received. FIG. 11 shows a case where this inquiry is made to the video display processing units 3 of # 2 and # 3.
This inquiry is made by the route shown by the one-dot chain line d or e in the figure. In those video display processing units 3, the response means 29 responds whether or not the digital video signal is currently being received from the video transmission processing unit 2 of #A.
In this case, since the # 2 video display processing unit 3 is currently receiving the digital video signal from the #A video transmission processing unit 2, the reply to that effect is given by reversing the route indicated by the alternate long and short dash line d. It is returned to the video display processing unit 3 of #n. Accordingly, since it is determined in step ST42 whether or not there is a match, the inquiry means 24 of the #n image display processing unit 3 sets #.
The video display processing unit 3 of No. 2 is inquired through the path of the one-dot chain line d as to whether or not the digital video signal being received can be newly transmitted.

In step ST43, the response means 29 of the video display processing section 3 of # 2 determines whether or not there is a margin in the transmission line 5 in the same manner as the determination means 22 of the video transmission processing section 2 in the first embodiment. The judgment result is returned to the video display processing unit 3 of #n. If there is a margin in the determination result, the process proceeds to step ST44, and the request means 25 activates the transfer of the digital video signal to the # 2 video display processing unit 3 through the route shown by the alternate long and short dash line d in FIG. . As a result, the digital video signal transmitted from the #A video transmission processing unit 2 to the # 2 video display processing unit 3 is transmitted from the reception / retransmission means 23 of the # 2 video display processing unit 3 to the broken line f in FIG. The video display processing unit 3 of #n according to the route shown by
Is transmitted to In the image display processing unit 3 of #n, step S
At T45, the digital video signal is received by the reception / retransmission means 23, and the video is displayed on the video display device 4.

On the other hand, if it is determined in step ST42 that there is no match, and if it is determined in step ST43 that there is no margin, the process proceeds to step ST46. In step ST46, the inquiry means 2 of the image display processing unit 3 of #n.
4 inquires of the video transmission processing unit 2 of #A whether or not the digital video signal currently being transmitted can be newly transmitted, and if there is a reply from the determination means 22 that it is possible. The request means 25 starts the transmission of the digital video signal. If the answer from the determination means 22 is not possible, the process goes on standby in step ST48.

In the #n video display processing section 3, the stored video from the video time 8:07 in the video stored in the video storage means 16 of the #A video transmission processing section 2 is stored. If it becomes necessary to display on the video display device 4, #
The inquiry means 24 of the n video display processing section 3 inquires of each video display processing section 3 whether or not the stored video is stored in the video storage means 17. Thereafter, the processing is executed according to the procedure of the flowchart shown in FIG. 12, just as in the case of the input video imaged by the camera 1.

Embodiment 5. In each of the above-described embodiments, the maximum transmission capacity of the transmission path 5 to which the video transmission processing unit 2 is connected is used as the transmission capacity of the video transmission processing unit 2, but the maximum processing capacity of the video transmission processing unit 2 is described. It can also be used as a transmission capability. That is, the storage means 1
The maximum processing capacity of the video transmission processing section 2 is stored in 5 or 26 as the transmission capacity of the video transmission processing section 2, and the maximum processing capacity of the video transmission processing section 2 and the input video are determined by the judging means 22 or 27. Alternatively, it is determined whether or not a new digital video signal can be transmitted, based on comparison with the total transmission capacity used for transmitting the digital video signal of the stored video.

The transmission capacity as the criterion is determined by the transmission line 5
It is possible to make a more appropriate determination by properly using the maximum transmission capacity and the maximum processing capacity of the video transmission processing unit 2. That is, when the maximum processing capacity of the video transmission processing unit 2 exceeds the maximum transmission capacity of the connected transmission path 5, the maximum transmission capacity of the transmission path 5 is used as the transmission capacity, and the input video currently being transmitted and Judgment is made by checking whether or not the transmission capacity used for transmitting the digital video signal of the stored video has a margin. If the maximum processing capacity of the video transmission processing unit 2 is less than the maximum transmission capacity of the connected transmission path 5, the maximum processing capacity of the video transmission processing unit 2 is used as the transmission capacity to The judgment is made by checking whether or not the maximum processing capacity has a margin.

Embodiment 6 FIG. In each of the above-described embodiments, the video transmission processing units each have one camera input, but the present invention is not limited to this, and the video transmission processing unit has a plurality of camera inputs. The configuration may be such that the same effects as those of the above-described respective embodiments are obtained.

[0062]

As described above, according to the first aspect of the present invention, the video transmission processing unit stores the transmission capacity of itself, the transmission destination of the currently transmitted digital video signal, and its used transmission capacity. Storage means is provided, and in response to an inquiry from the video display processing section side, the result of determination as to whether transmission is possible based on the storage data of this storage means or the destination of the digital video signal is answered and the video display is received. The processing unit is configured to request transmission of the corresponding digital video signal to the video transmission processing unit if transmission is possible, and to the video display processing unit notified by a subsequent inquiry if transmission is not possible. Therefore, even if the transmission capacity of the transmission line on the video transmission processing side is not increased more than necessary, the probability of waiting for the digital video signals of the desired input video in multiple video display processing units Freely able to receive without increasing, there is an effect that it is possible to reduce the cost of the transmission path.

According to the second aspect of the present invention, only the digital video signal of the video currently being input is simultaneously transmitted from the transmission means to the plurality of video display processing units, so that the apparatus cost can be reduced. The digital video signal of the desired input video can be freely received by the plurality of video display processing units without increasing the transmission capacity of the transmission line on the video transmission processing side more than necessary.

According to the third aspect of the invention, the video transmission processing section is provided with a video storage means for temporarily storing the input video, and the transmission history of the stored video is stored in the storage means, and whether or not the stored video can be transmitted. Also, since the inquiry is made based on the stored data for the inquiry about the destination of the stored video, the transmission capacity of the transmission path of the video transmission processing side can be applied to the digital video signal of the desired stored video. Is not increased more than necessary, the probability of waiting is not increased, and a plurality of video display processing units can freely receive, and the cost of the transmission path can be reduced.

According to the fourth aspect of the present invention, the transmission path management section is connected to the transmission path, and the transmission capability of each video transmission processing section and the digital video currently transmitted by each video transmission processing section are connected to the transmission path management section. Storage means for storing the destination of the signal and its used transmission capacity, and a determination result of whether or not the digital video signal can be transmitted based on the data stored in the storage means in response to an inquiry from the video display processing section, and the digital video Since the determination means for answering the destination of the signal is provided and the inquiry from the video display processing section is made to this transmission path management section, each stored data can be managed at one place, so that the consistency is maintained. Can not only increase
Since the storage means and the determination means can be centrally arranged at one place, the system configuration is simplified and an inexpensive video data transmission system can be constructed.

According to the fifth aspect of the invention, the transmission capability serving as a criterion for determining whether or not the digital video signal can be transmitted is:
Since the maximum transmission capacity of the transmission line to which the video transmission processing unit is connected is used, the maximum processing capacity of the video transmission processing unit exceeds the maximum transmission capacity of the transmission line to which it is connected. In addition, there is an effect that it is possible to reliably determine whether or not the digital video signal can be transmitted.

According to the sixth aspect of the present invention, the transmission capability serving as a criterion for determining whether or not the digital video signal can be transmitted is as follows.
Since it is configured to use the maximum processing capacity of the video transmission processing unit, when the maximum processing capacity of the video transmission processing unit is less than the maximum transmission capacity of the transmission path to which it is connected,
This has the effect of reliably determining whether or not a digital video signal can be transmitted.

According to the seventh aspect of the invention, an inquiry as to whether or not a digital video signal is being received from a video transmission processing unit having a desired input video input is made to another video display processing unit. As a result of the inquiry, the video display processing unit that responded that the corresponding digital video signal was being received was requested to send it out.Therefore, increase the transmission capacity of the transmission line on the video transmission processing side more than necessary. Even if it is not necessary, the digital video signals of the desired input video can be freely received by the plurality of video display processing units without increasing the waiting time, and the cost of the transmission path can be reduced. There is.

According to the eighth aspect of the present invention, if there is no video display processing unit that is receiving the digital video signal of the desired input video, a request for sending the digital video signal is issued to the video sending processing unit. With this configuration, when the plurality of video display processing units receive the digital video signal of the desired input video, the probability of waiting is further reduced.

According to the ninth aspect of the invention, the other video display processing unit is inquired as to whether or not the desired accumulated image is accumulated, and as a result of the inquiry, the accumulated image is accumulated. Since it is configured to request the video display processing unit that responds to the transmission of the digital video signal of the desired stored video without increasing the transmission capacity of the transmission line on the video transmission processing side more than necessary. The plurality of video display processing units can be freely received without increasing the waiting time, and the cost of the transmission path can be reduced.

According to the tenth aspect of the present invention, if there is no video display processing unit accumulating the desired accumulated video, a request for transmitting the accumulated video is issued to the video transmission processing unit. Also, it is possible to further reduce the probability of waiting even when the digital video signals of the desired stored video are received by the plurality of video display processing units.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a configuration of a video data transmission system according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a flow of information according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing an operation procedure in the first embodiment of the present invention.

FIG. 4 is a system configuration diagram showing a configuration of a video data transmission system according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a flow of information according to the second embodiment of the present invention.

FIG. 6 is a flowchart showing an operation procedure according to the second embodiment of the present invention.

FIG. 7 is a system configuration diagram showing a configuration of a video data transmission system according to a third embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a flow of information according to the third embodiment of the present invention.

FIG. 9 is a flowchart showing an operation procedure in the third embodiment of the present invention.

FIG. 10 is a system configuration diagram showing a configuration of a video data transmission system according to a fourth embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a flow of information according to the fourth embodiment of the present invention.

FIG. 12 is a flowchart showing an operation procedure in the fourth embodiment of the present invention.

FIG. 13 is a system configuration diagram showing a configuration of a conventional video data transmission system.

FIG. 14 is a flowchart showing an operation procedure in a conventional video data transmission system.

[Explanation of symbols]

2 video transmission processing section, 3 video display processing section, 4 video display device, 5 transmission path, 6 transmission path management section, 15, 18,
26 storage means, 16, 17 video storage means, 21 transmission means, 22, 27 determination means, 23 reception / retransmission means, 24 inquiry means, 25 request means, 28 notification means, 29 response means.

Front Page Continuation (72) Inventor Fumio Matsuda 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (10)

[Claims] 1. A plurality of video sending processing units for digitizing and sending an input video, and a digital video signal of the input video sent from the video sending processing unit for receiving and displaying on a video display device. In a video data transmission system including a plurality of video display processing units that perform processing, and a transmission line to which the video transmission processing unit and the video display processing unit are connected, the video display processing unit includes: A receiving / sending means having a function of receiving a digital video signal of an input video and retransmitting the digital video signal to a transmission line in response to a request, and the video transmission processing unit having a desired input video input. An inquiry means for making an inquiry as to whether or not a new digital video signal is to be sent out, and a destination to which the digital video signal is currently sent, and the inquiry means. To the destination notified as a result of the inquiry, that is, the video display processing unit to which the digital video signal is currently being sent, is provided with requesting means for requesting the sending of the digital video signal. The transmission means for simultaneously transmitting the digital video signal of the input video to the plurality of video display processing units, the transmission capability of the video transmission processing unit, and the destination and the destination of the digital video signal currently being transmitted. When there is an inquiry from a storage unit that stores the used transmission capacity, and an inquiry unit of the video display processing unit, based on the data stored in the storage unit,
A video data transmission system, characterized in that a judgment means for giving a judgment result as to whether or not a digital video signal can be transmitted or a video display processing section to which the digital video signal is currently transmitted is provided. 2. The transmission means of the video transmission processing unit simultaneously transmits only the digital video signal of the input video currently being input to the plurality of video display processing units. The described video data transmission system. 3. The video transmission processing unit is provided with a video storage means for temporarily storing an input video, and the storage means has a function of transmitting a digital video signal of the stored video stored in the video storage means. A function of storing the history of transmission of the digital video signal of the stored video to the video display processing unit by the transmission means, based on the history data stored in the storage means when the determination means is inquired. A video storing means for temporarily storing the stored video received from the video sending processing part, by adding a function of responding to the video display processing part to which the corresponding stored video is transferred. The storage means for storing the transmission source of the stored video stored in the video storage means is provided, and the desired storage video is stored in the video storage means in the inquiry means. The requesting means to the video transmission processing section for inquiring about whether or not the stored video can be transmitted and the transfer destination of the stored video.
The function of requesting the sending of the stored video to the video display processing unit that responds that the corresponding stored video is stored is provided to the receiving / sending means by the stored video from other video display processing units. 2. The video data transmission system according to claim 1, further comprising a function of reading the corresponding stored video from the video storage means and sending it to the video display processing unit in response to the transmission request of the above. 4. A plurality of video transmission processing units for digitizing and transmitting an input video, and for receiving a digital video signal of the input video transmitted from the video transmission processing unit and displaying it on a video display device. In a video data transmission system including a plurality of video display processing units that perform processing, and a transmission path to which the video transmission processing unit and the video display processing unit are connected, a transmission path management unit that manages a transmission status on the transmission path. Receiving / retransmitting means having a function of receiving a digital video signal of the input video from the transmission path to the video display processing section and re-sending the digital video signal to the transmission path in response to a request. And whether or not new transmission of the digital video signal being transmitted by the video transmission processing unit to which the desired input video is input is transmitted to the transmission path management unit, An inquiry means for making an inquiry about the destination to which the digital video signal is being sent, and the result of the inquiry made by the inquiry means is notified.
The video display processing unit to which the digital video signal is currently sent is provided with requesting means for requesting the sending of the digital video signal, and the video sending processing unit is provided with a plurality of digital video signals of the input video. A transmission means for transmitting simultaneously to the video display processing section, a destination for transmitting the digital video signal currently being transmitted, and a notification means for notifying the transmission path management section of the transmission capacity used for it are provided, Storage means for storing the transmission capability of each video transmission processing unit, the transmission destination of the digital video signal currently being transmitted by each video transmission processing unit, and the transmission capacity used by the transmission path management unit. When there is an inquiry from the inquiry means of the video display processing unit, based on the data stored in the storage means,
A video data transmission system, characterized by comprising a judgment means for giving a judgment result of whether or not a digital video signal can be transmitted, or a video display processing unit to which the digital video signal is currently transmitted. 5. The maximum transmission capacity of the transmission line to which the video transmission processing unit is connected is stored in the storage means as the transmission capacity, and the determination means uses the maximum transmission capacity of the transmission path and the current digital video signal transmission. The video data transmission system according to any one of claims 1 to 4, wherein whether or not the digital video signal can be transmitted is determined by comparison with the total transmission capacity. 6. The maximum processing capacity of the video transmission processing section is stored in the storage means as the transmission capacity, and the determination means has the maximum processing capacity of the video transmission processing section and the transmission capacity currently used for the transmission of the digital video signal. The video data transmission system according to any one of claims 1 to 4, wherein whether or not the digital video signal can be transmitted is determined by comparison with the sum of the above. 7. A plurality of video transmission processing units for digitizing and transmitting the input video, and a digital video signal of the input video transmitted from the video transmission processing unit for receiving and displaying on a video display device. In a video data transmission system including a plurality of video display processing units that perform processing, and a transmission line to which the video transmission processing unit and the video display processing unit are connected, the video display processing unit includes: The receiving / sending means having the function of receiving the digital video signal of the input video and re-transmitting the digital video signal to the transmission line in response to the request, and the other video display processing unit, Inquiring means for inquiring whether or not a digital video signal is being received from a video transmission processing unit having an input and whether or not a new digital video signal being received can be transmitted, In response to the inquiry by the inquiry means of the image display processing unit, a response means for answering whether or not the corresponding digital image signal is being received, or whether or not the digital image signal being received can be newly transmitted. As a result of the inquiry by the inquiry means, requesting means for requesting the transmission of the digital video signal is provided to the video display processing section which has received a response that the corresponding digital video signal is being received. Video data transmission system. 8. The requesting means has a function of requesting the video transmission processing section to transmit the digital video signal when the video display processing section is not receiving the digital video signal of the desired input video. The video data transmission system according to claim 7, wherein the video data transmission system is provided. 9. A video transmission processing section for temporarily storing an input video currently being input, a digital video signal of the input video currently being input, and an accumulated video temporarily stored in the video storage means. A transmission means for transmitting the digital video signal to the video display processing unit is provided, and the video display processing unit temporarily stores the storage video received from the video transmission processing unit, and the storage video stored in the video storage unit. In addition to providing a storage means for storing the transmission source of the, the inquiry means, to other video display processing unit, whether or not the desired accumulated video is accumulated in the video accumulation means, and the transmission of the accumulated video. The function of inquiring whether or not the
Alternatively, if the request means has a response that the desired accumulated image is accumulated, the function for answering whether or not the accumulated image can be transmitted is sent to the image display processing unit. The function of requesting the transmission of the video signal is such that the receiving / sending means receives the stored video from the video storage means, and stores the corresponding stored video in accordance with the request from another video display processing section. 8. The video data transmission system according to claim 7, wherein the video data transmission system has a function of reading out from the means and sending out to a transmission line. 10. The requesting means is provided with a function of requesting the transmission of the accumulated video to the video transmission processing section when there is no video display processing section accumulating a desired accumulated video. The video data transmission system according to claim 9, which is characterized in that.