JP2009255782A - Image transmission system and image transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain one-to-many communication and two-way communication between a platform of a railroad station and a vehicle, and to selectively give/receive suitable information at a transmission side and a receiving side even when a plurality of pieces of information are transmitted. <P>SOLUTION: A platform side radio transmission part 160 of a platform side device 110 and a vehicle side radio transmission part 260 of a vehicle side device 210 are radio-connected. When a plurality of image information obtained by photographing the respective platforms are transmitted to the vehicle side device 210, a transmission control device 140 obtains a track circuit information regarding the operation state of the vehicle including advancement information regarding an advancement passage of the vehicle and on-rail information regarding the on-rail state of the vehicle to the platform from the station. The transmission control device 140 determines the image information to be displayed in the vehicle at the transmission side based on the track circuit information and constitution information regarding the arrangement of the platform of the station and the platform side device, and outputs the image selection information indicating the determined image information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video transmission system and a video transmission apparatus that transmit information including video between a platform of a passenger transportation system such as a railway and a vehicle.

  2. Description of the Related Art Conventionally, there is a video transmission system that transmits a video signal from a station platform to a vehicle and displays a captured video on the platform in a vehicle cab in order to support a one-man driving of the vehicle in a passenger transportation system such as a railway. By using such images around the home, the driver can visually check whether passengers are getting on and off, and can monitor the state of the home and the vehicle. In this type of video transmission system, a method of wirelessly modulating and transmitting a video signal itself is used in the same manner as in radio broadcasting and the like, which is one-to-one and one-way communication (for example, Patent Document 1). reference). In the video transmission system of the above conventional example, since it is one-to-one communication, it is not possible to receive and switch a plurality of videos on the vehicle side, or to distribute a plurality of videos to different vehicles. Moreover, since it is one-way communication, information cannot be transmitted from the vehicle to the platform side of the station.

Recently, in a video transmission system used between a station platform and a vehicle, one-to-many communication or two-way communication that distributes video to a plurality of vehicles stopped on both sides of the platform or exchanges information other than video. A communication function is desired. Here, when using the system of the one-to-one unidirectional communication method, since it is necessary to provide a transmission device for each information to be transmitted, the system configuration becomes complicated, and there are problems in cost and layout, Placement is difficult. As a system capable of two-way communication, an information communication system that performs wireless communication using a communication method such as a wireless LAN and transmits information in a passenger transportation system has been proposed (see, for example, Patent Document 2). ). However, in this type of home-vehicle video transmission system, simply applying a communication system such as a wireless LAN correctly identifies the vehicle to be transmitted on the home side, and is appropriate for each of the plurality of vehicles. Information such as home video cannot be transmitted selectively. On the vehicle side, information on the home number line to be displayed cannot be obtained, so there was no way to select an appropriate home video when attempting to perform communication other than one-to-one.
JP 2002-104189 A Japanese Patent Laid-Open No. 2005-136885

  As described above, in a conventional video transmission system, when one-to-many or two-way communication is performed, simply by applying a communication method such as a wireless LAN, a vehicle to be transmitted is correctly identified on the home side. However, there is a problem that information such as an appropriate home video cannot be selectively transmitted to each of a plurality of vehicles. In addition, since information on the home number line to be displayed cannot be obtained on the vehicle side, when a plurality of information is transmitted from the home side, information such as an appropriate home video cannot be selected and displayed. There is a problem.

  The present invention has been made in view of the above circumstances, and is capable of one-to-many communication and two-way communication between a station platform and a vehicle, and is suitable on the transmitting side and the receiving side even when transmitting a plurality of information. An object of the present invention is to provide a video transmission system and a video transmission apparatus capable of selectively transmitting and receiving various information.

The present invention relates to a video transmission system for transmitting information including video between a platform of a passenger transportation system station and a vehicle, the home side device provided in or near the home, and the vehicle side provided in the vehicle. And the home side device wirelessly transmits information including one or a plurality of the video information, and generates and transmits video information captured in the home. A home-side wireless transmission unit capable of one-to-many communication and two-way communication with a device, and track circuit information on the operation state of the vehicle is acquired from the station. A transmission control unit that determines video information to be displayed on a transmission destination vehicle based on configuration information related to the arrangement of the device and outputs video selection information indicating the determined video information. The vehicle-side device is wirelessly connected to the home-side wireless transmission unit and capable of bidirectional communication with the home-side device, and based on the video selection information, the home-side device There is provided a video transmission system including a video acquisition unit that outputs video information to be displayed from information transmitted from a display unit, and a display unit that displays video information output from the video acquisition unit.
Thereby, one-to-many communication and bidirectional communication are possible between the platform of the station and the vehicle by wirelessly connecting the home-side wireless transmission unit and the vehicle-side wireless transmission unit. In addition, for example, even if there are a plurality of platforms at a station and a plurality of video information of each home is transmitted from the home side device to the vehicle side device, based on the track circuit information and the station configuration information, It is possible to determine appropriate video information to be displayed on the transmission destination vehicle. Therefore, when transmitting a plurality of information, it is possible to selectively exchange appropriate information on the transmitting side and the receiving side.

Further, the present invention is the video transmission system described above, wherein the transmission control unit includes, as the track circuit information, route information relating to a route of the vehicle and presence line information relating to the presence state of the vehicle to the home. Including track circuit information, and determining video information to be displayed on the transmission destination vehicle based on connection information between the home-side wireless transmission unit and the vehicle-side wireless transmission unit.
This makes it possible to select appropriate video information in the transmission destination vehicle based on the route information, on-line information, and connection information, depending on the vehicle's route and on-line state and the connection state between the home side wireless transmission unit and the vehicle side wireless transmission unit. Is possible.

Also, the present invention is the video transmission system described above, wherein the transmission control unit holds vehicle-video correspondence information indicating correspondence between the corresponding vehicle and the video selection information when determining the video information to be displayed. Then, the vehicle-video correspondence information is referred to based on the connection information, and when previous video selection information corresponding to the corresponding vehicle is held, the video information to be displayed is determined based on the video selection information. Including what to do.
Thereby, when the previous video selection information corresponding to the corresponding vehicle is held, the video information to be displayed is determined by this video selection information, for example, when wireless communication is temporarily interrupted and returned. In addition, it is possible to quickly select appropriate video information using the previous determination result.

  The present invention is a video transmission device that is used in a video transmission system that transmits information including video between a platform of a passenger transport system station and a vehicle, and is a home-side device provided in or near the home, One-to-many communication and two-way communication between a video transmission unit that generates and transmits video information captured in the home and information including one or a plurality of the video information. The home side wireless transmission unit capable of communication and the track circuit information related to the operation state of the vehicle are acquired from the station, and the transmission destination is determined based on the track circuit information and the configuration information related to the arrangement of the platform of the station and the home side device. And a transmission control unit that determines video information to be displayed in the vehicle and outputs video selection information indicating the determined video information.

  The present invention is a video transmission device that is used in a video transmission system that transmits information including video between a platform of a passenger transport system station and a vehicle, and is a vehicle-side device provided in the vehicle. A plurality of information including the video information is wirelessly transmitted, a vehicle-side wireless transmission unit capable of two-way communication with a home-side device, and track circuit information regarding a vehicle operating state in the home-side device; , Acquiring video selection information indicating video information to be displayed on the vehicle, determined based on the configuration information regarding the platform of the station and the home side device, and from the home side device based on the video selection information A video transmission device comprising: a video acquisition unit that outputs video information to be displayed from the transmitted information; and a display unit that displays video information output from the video acquisition unit Subjected to.

  According to the present invention, one-to-many communication and two-way communication are possible between a station platform and a vehicle, and appropriate information is selectively exchanged on the transmitting side and the receiving side even when transmitting a plurality of information. A video transmission system and a video transmission apparatus capable of performing the above can be provided.

  FIG. 1 is a diagram showing a schematic configuration of a video transmission system according to an embodiment of the present invention. The video transmission system of the present embodiment is used in a passenger transportation system such as a railroad, and has a function of transmitting information including video between a station platform and a vehicle for one-man driving support. . This video transmission system is roughly divided into a home device and a vehicle device. Here, a case where the passenger transportation system is applied to a platform of a railway station and a train vehicle that enters the platform and stops is exemplified.

  The platform 101 of the station is provided with a home side device corresponding to a platform number where the vehicle stops. In the example of FIG. 1, two home-side devices are provided in correspondence with two upstream and downstream numbers of the home 101. One home side apparatus has a plurality of (in this case, four) cameras 151a, 151b, 151c, 151d, a video transmission unit 150, and a home side wireless transmission unit (AP) 160. The other home side device has a plurality of (here, four) cameras 171a, 171b, 171c, 171d, a video transmission unit 170, and a home side wireless transmission unit (AP) 180. Further, as the home side device, a transmission control device 140 that controls data transmission processing by the video transmission units 150 and 170 is provided. Depending on the home configuration, only one video transmission unit or home-side wireless transmission unit may be provided, or three or more may be provided.

  One vehicle 200 is provided with vehicle-side devices 210 and 220 including a wireless transmission unit and a display unit. Usually, a total of two vehicle-side devices are provided, one for each cab in the front and rear ends of the vehicle. Similarly, the other vehicles 300 are also provided with vehicle-side devices 310 and 320.

  FIG. 2 is a diagram showing a schematic configuration of the passenger transport system according to the present embodiment. In the railway network 600, there are an A station 100 and a B station 500, and platform devices 110 and 510 are provided at these stations, respectively. For example, when the vehicle 200 stops at the platform of the A station 100, the home side device 110 and the vehicle side device 210 of the vehicle 200 are wirelessly connected, and video information and the like are transmitted from the home side device 110 to the vehicle side device 210 by wireless communication. The These home-side devices 110 and 510 and the vehicle-side device 210 are configured to construct an IP (Internet Protocol) network by a wired network or a wireless network, and are managed by a management center 650 provided at a command office of the rail network 600 or the like. IP addresses and the like are managed. The IP address of the vehicle side device is assigned from the home side device when wirelessly connected.

  FIG. 3 is a block diagram showing a detailed configuration of the video transmission system of the present embodiment. The home side device 110 includes cameras 151a, 151b, 151c, and 151d, a video transmission unit 150, a transmission control device 140, an input / output interface 155, media converters 156 and 157, and a home side wireless transmission unit (AP) 160. And an antenna 161. Cameras 151a, 151b, 151c, and 151d capture each part on the platform including the vehicle and passengers, and output a video signal of a home image that captures the state of the home and the vehicle. The input / output interface 155 inputs and outputs other transmission information other than the home video such as station information, vehicle operation information, and news.

  The video transmission unit 150 performs transmission processing of home video signals captured by the cameras 151a, 151b, 151c, and 151d, and includes an image synthesis unit 152, an encoder 153, and a switch 154. The video transmission unit 150 can also perform transmission processing of information input from the input / output interface 155. The image synthesis unit 152 synthesizes four video signals photographed by the cameras 151a, 151b, 151c, and 151d. The encoder 153 encodes the video signal output from the image synthesis unit 152 and generates a data packet that can be transmitted on the network. Here, when the video transmission unit 150 is shared by a plurality of home numbers, video information of a plurality of systems is input to the encoder 153. For example, when one video transmission unit 150 is used for the upstream number line and the downstream number line, the video information of each home number line is input.

  The switch 154 is configured by a layer 2 switch (L2 switch) or the like that operates on the IP network. The switch 154 receives video information from the encoder 153 and other transmission information data packets from the input / output interface 155, and interprets the address information. Or addition, change, etc., and output to the home-side wireless transmission unit 160. The switch 154 can also receive the data packet input from the home-side wireless transmission unit 160 and output it to the input / output interface 155. The switch 154 of the video transmission unit 150 and the home-side wireless transmission unit 160 are connected via a media converter 156, an optical communication line 158, and a media converter 157, enabling long-distance communication and high-speed data transmission. .

  Home-side wireless transmission unit 160 includes a wireless transmission / reception unit, transmits and receives wireless signals via antenna 161, and is wirelessly connected to vehicle-side wireless transmission unit 260 of vehicle-side device 210. Here, the home-side wireless transmission unit 160 is connected to the wireless transmission units of a plurality of vehicle-side devices, and can transmit and receive a plurality of data in parallel with each wireless transmission unit.

  The transmission control device 140 inputs the route information by the contact signal from the station and the on-line information as the track circuit information related to the operation state of the vehicle, and the track circuit information and the wireless transmission unit of the home side device and the vehicle side device. Based on the connection information and the station configuration information set in advance, video information to be displayed for a specific vehicle-side device to be transmitted is determined, and the determined video selection information is sent to the switch 154 of the video transmission unit 150. To output and instruct. The transmission control device 140 realizes the function of the transmission control unit. The route information and on-line information will be described in detail later. Here, the video transmission unit 150, the input / output interface 155, and the transmission control device 140 are collectively referred to as a video transmission control unit 130.

  The vehicle-side device 210 includes a vehicle-side wireless transmission unit (STA) 260, an antenna 261, a video acquisition unit 250, a display unit 253, an input / output interface 255, and an in-vehicle device controller 240. The vehicle-side wireless transmission unit 260 includes a wireless transmission / reception unit, transmits and receives wireless signals via the antenna 161, and is wirelessly connected to the home-side wireless transmission unit 160. The in-vehicle device controller 240 inputs a front position signal and a low speed signal from the vehicle as vehicle signals, and controls operations such as wireless connection in the vehicle side wireless transmission unit 260. The front position signal and the low speed signal will be described later. In an actual apparatus, the vehicle-side wireless transmission unit 260 and the in-vehicle device controller 240 may be integrally configured.

  The video acquisition unit 250 outputs video information to be displayed from the information transmitted from the home-side device 110, and includes a switch 251 and a decoder 252. The switch 251 is configured by a layer 2 switch (L2 switch) or the like that operates on the IP network. The switch 251 inputs video information output from the vehicle-side wireless transmission unit 260 and data packets of other transmission information, and reads address information. Or addition, change, etc., and output to the decoder 252 or the input / output interface 255. The switch 251 can also receive a data packet input from the input / output interface 255 and output the data packet to the vehicle-side wireless transmission unit 260. The decoder 252 decodes the data packet of the video information output from the switch 251 and reproduces and outputs the video signal. At this time, based on the video selection information sent from the home side device 110, appropriate video information to be displayed is selected and output. The display unit 253 displays the video signal output from the decoder 252. Thereby, the home video image | photographed with camera 151a, 151b, 151c, 151d is displayed in the cab in which the vehicle side apparatus 210 is provided.

  The home-side wireless transmission unit 160 and the vehicle-side wireless transmission unit 260 are equipped with wireless LAN modules compatible with wireless LAN communication methods such as IEEE802.11a / b / g / j, and wireless network transmission by wireless LAN is possible. It is possible. Accordingly, the transmission control device 140, the encoder 153, the switch 154, the home side wireless transmission unit 160, the vehicle side wireless transmission unit 260, the switch 251, and the decoder 252 can perform IP communication with each other. The IP communication enables one-to-many communication, bidirectional communication, and various data communication other than video. Note that, not limited to a wireless LAN, other wireless communication methods capable of one-to-many communication and bidirectional communication such as Bluetooth (registered trademark) may be applied.

  The video data is converted to IP by the encoder 153 of the home device 110 so that a plurality of videos can be multiplexed on the same communication path. In each video data, different IP addresses are set as communication destinations, and the vehicle-side wireless transmission unit 260 of the vehicle-side device 210 can flexibly switch the received video data by switching the IP address of its own wireless module. it can. The video data received by the vehicle-side device 210 is returned to an analog video signal by the decoder 252 and displayed on the display unit in the cab.

  Here, a specific example is shown in which the home side device 110 is configured to be shared by the first home of the up home number line and the second home of the down home number line, and video is transmitted to vehicles stopped at the respective homes.

  In this case, for example, the first home video is transmitted to the address 192.168.255.253, and the second home video is transmitted to the address 192.168.255.252 from the home apparatus 110 via the wireless LAN.

In the vehicle-side wireless transmission unit 260 of the vehicle-side device 210, the following IP address including the alias is set in the wireless module (eth0).
eth0: DHCP (172.16.xxx.xxx)
eth0: 0: 192.168.255.254
eth0: 1: 192.168.255.253
eth0: 2: 192.168.255.252
The vehicle-side wireless transmission unit 260 enables eth0: 1 and disables eth0: 2 when displaying the video of the first home. When displaying home number 2, disable eth0: 1 and enable eth0: 2. As a result, only desired video data can be received.

  In addition, information on which IP address should be displayed in the vehicle-side wireless transmission unit 260, that is, video selection information of the video information to be displayed determined by the transmission control device 140 is stored in the vehicle-side wireless transmission unit 260. Sent and received using eth0 (assigned by DHCP). This “video selection information indicating which IP address is to be displayed” is also referred to as “video stream information”. Details will be described later.

  FIG. 4 is a sequence diagram showing a video information transmission operation in the video transmission system of this embodiment. Here, the operation in the case of selectively transmitting a video stream of a home video captured by the home side apparatus 110 will be mainly described.

  When the vehicle arrives at the station platform and stops, and the vehicle-side wireless transmission unit 260 in the driver's cab enters the communication area of the home-side wireless transmission unit 160, the vehicle-side wireless transmission unit 260 changes to the home-side wireless transmission unit 160. A connection request is sent and connection processing by wireless LAN is performed (step S11). Thereby, the vehicle side wireless transmission part 260 and the home side wireless transmission part 160 will be in a link state, respectively (step S12, S13).

  At this time, the wireless connection operation is started by the state of the low-speed signal and the front position signal input to the vehicle-mounted device controller 240 of the vehicle-side device 210. The low speed signal is turned on when the speed is 5 km / h or less, for example, immediately before stopping, and turned off when the speed exceeds 5 km / h after departure. The front position signal is turned on when the cab is in a key input state on the cab in a state where the cab is on the traveling direction side, and turned off when the cab is on the side opposite to the traveling direction. This front position signal is controlled exclusively so that the front and rear cabs are not simultaneously turned on. When the low-speed signal is ON and the front position signal is ON, a connection instruction is sent from the in-vehicle device controller 240 to the vehicle-side wireless transmission unit 260, and the vehicle-side wireless transmission unit 260 is sent to the home-side wireless transmission unit 160. Try to connect.

  When the home-side wireless transmission unit 160 is linked to the vehicle-side wireless transmission unit 260, the home-side wireless transmission unit 160 transmits link information indicating that the vehicle-side wireless transmission unit 260 is linked to the wireless transmission unit of the corresponding vehicle to the transmission control device 140 of the video transmission control unit 130. (Step S14). In response to this, the transmission control device 140 returns an ACK (Acknowledgment) of link information to the home-side wireless transmission unit 160 (step S15). The transmission control device 140 obtains information on which home-side wireless transmission unit and vehicle-side wireless transmission unit are connected by wireless LAN based on the link information sent from the home-side wireless transmission unit 160.

  Next, when the vehicle-side wireless transmission unit 260 enters the link state, the vehicle-side wireless transmission unit 260 transmits a video information request to the transmission control device 140 (step S16). The video information request from the home side wireless transmission unit 160 is given with the train ID for identifying the vehicle and the address information (MAC address, IP address, etc.) of the wireless transmission unit of the home side device.

  The transmission control device 140 acquires route information and on-line information from the station as track circuit information regarding the operation state of the vehicle. Upon receiving the video information request, the connection information between the home side device and the vehicle side device based on the link information, the route information and the on-line information, and the station configuration information set and held in advance. Based on this, in the vehicle side device of the specific vehicle to be transmitted, which home video is to be displayed and an appropriate video stream to be displayed are determined (step S17). Depending on conditions, a video stream to be displayed may be determined using the train ID for vehicle identification. The procedure for determining the transmission target video stream will be described later.

  After the video stream is determined, the transmission control device 140 sends an instruction to the video transmission unit 150 to display video stream information indicating which home video is to be displayed and video information corresponding to the video information request. Transmission is performed from the transmission unit 150 to the vehicle-side wireless transmission unit 260 (step S18). The vehicle-side wireless transmission unit 260 receives the transmitted video stream information and video information. Information on which IP address is to be displayed is obtained from the acquired video stream information. Then, the vehicle-side wireless transmission unit 260 sets the output of the video information based on the video stream information, and selectively switches the video information addressed to the appropriate IP address instructed from the transmission control device 140 to the vehicle-side device 210. The video signal to be displayed is reproduced and output to the display unit 253 (step S19). As a result, the video stream of the target home video is displayed on the display unit 253. In the above procedure, it is described that the video information is transmitted in response to the video information request. However, normally, when the wireless transmission units are in a link state, the home side device 110 always changes to the vehicle side device 210. One or a plurality of video streams are transmitted to the vehicle side device 210, and a video stream addressed to an appropriate IP address to be displayed is selected and displayed on the vehicle side device 210 based on the video stream information.

  Next, specific examples of route information, on-line information, and train ID will be described. FIG. 5 is a diagram for explaining route information and standing line information. The course information is information related to the course of the vehicle. In the example of FIG. 5A, the four course information (1), (2), (3), and (4) can be set for the home and the track. When the vehicle enters the home, one of the route information (1) to (4) is input to the transmission control device 140 according to the traveling route. This route information is turned ON when a route is drawn on the route, and turned OFF when the head of the vehicle passes a predetermined point (shown points (1) to (4)) on the route. That is, it is possible to determine which route the vehicle has entered through the route information.

  The standing line information is information related to the standing state of the vehicle to the home. In the example of FIG. 5A, it is possible to set two standing line information [A] and [B] for the home. When the vehicle enters the home, one of the on-line information [A] and [B] is input to the transmission control device 140 depending on the on-line state. This on-line information is turned on when the head of the vehicle enters an area of, for example, less than 20 m before and after the platform, and turned off when the rear of the vehicle passes through this area. In other words, it is possible to determine in which home the vehicle currently exists (whether it is stopped) by the presence line information.

  When the vehicle enters the line and stops at the home as shown by the arrow in FIG. 5B, the route information (1) is first turned ON, and the route information (1) when the head of the vehicle passes through a predetermined point on this route. Is turned off, and the track information [A] is turned on when the head of the vehicle enters within 20 m before and after the platform. At this time, the standing line information is set to be turned on after the route information is turned off. The route information is mutually exclusive, and the route information and the on-line information are exclusively controlled. At the same time, the route information in the same direction is turned on, the related route information is turned on when the on-line information is on, and the same home The related route information is prohibited from being turned ON at the same time.

  FIG. 6 is a diagram showing route information and standing line information corresponding to a configuration example of a station. In the example of FIG. 6, there are two platform platforms, Home A and Home B, and there are three routes for these two platforms. In the trajectory corresponding to the upper home A in the figure, there are three incoming line patterns of entering from right → left, left → right, right and turning back to the right again. In the trajectory corresponding to the lower home B in the figure, the right → There are two incoming line patterns that enter from the left and right and turn back to the right again. In this example, route information (1), (2), (3), track information [A], [B] can be set, and for vehicles that have stopped at each platform based on the track information and track information. Determine an appropriate video stream. In this case, the video stream 1 obtained by photographing the home A is displayed for the vehicle stopped at the home A, and the video stream 2 obtained by photographing the home B is displayed for the vehicle stopped at the home B.

  On the platform of the station, a home-side radio transmission unit AP1 corresponding to the home A is arranged at one end on the right side in the drawing, and a home-side radio transmission unit AP2 corresponding to the home B on the opposite side. Is arranged. In addition, at the other end on the left side in the figure, a home-side wireless transmission unit AP3 is arranged corresponding to both the home A and the home B. Here, at least the home side wireless transmission units AP1 and AP2 arranged in the vicinity have different frequencies (channels) used for wireless communication.

  FIG. 7 is a diagram illustrating station configuration information based on a combination of standing line information and route information in the configuration example of FIG. 6, and FIG. 7A is a video stream, standing line information, and route corresponding to each home-side wireless transmission unit. FIG. 7B is a diagram showing a combination of information, and FIG. 7B is a diagram showing an exclusive relationship of route information. As shown in FIG. 7A, the home side wireless transmission unit AP1 transmits a video stream 1 corresponding to the home A. In-line information and route information corresponding to this case include a state in which the in-line information [A] is ON and the route information (3) is ON, and a state in which only the in-line information [A] is ON (no route information). The home side wireless transmission unit AP2 transmits the video stream 2 corresponding to the home B. In-line information and route information corresponding to this case are in the state where the on-line information [B] is ON only (no route information). The home-side wireless transmission unit AP3 transmits a video stream 1 corresponding to the home A and transmits a video stream 2 corresponding to the home B. The track information and route information corresponding to the case where the video stream 1 is transmitted include the status of track information [A] ON and track information (1) ON. In-line information and route information corresponding to the case where the video stream 2 is transmitted include a state in which the on-line information [B] is ON and the route information (2) is ON.

  As shown in FIG. 7B, when the route information (1) ON is input, the route information (2) ON and the route information (3) ON cannot be input by the exclusive control. Further, when the route information (2) ON is input, the route information (1) ON cannot be input due to the exclusive control. Further, when the route information (3) ON is input, the route information (1) ON cannot be input due to the exclusive control.

  FIG. 8 is a table showing setting information corresponding to the combination of standing line information and route information of FIG. 7, and FIG. 8A shows a video stream, standing line information, and route information corresponding to each home-side wireless transmission unit. FIG. 8B is a diagram of a route information exclusive setting information table showing an exclusive relationship of route information. The combination of the wireless transmission unit number (AP number) for each home-side wireless transmission unit shown in FIG. 7, the video stream number associated with this, the on-line information, and the route information can be expressed as shown in FIG. Here, the standing line information [A] and [B] correspond to the numbers 1 and 2, respectively. The station configuration information in which a combination of these information is set is information relating to the platform of the station and the arrangement of the home-side device, and indicates the correspondence between the course of the vehicle and the current line status and appropriate video information in each status. It is. The transmission control device 140 can determine the video stream to be displayed on the vehicle on the line using the configuration information of these stations. Note that the transmission control device 140 holds the current route information and the route information as well as the route information that was previously turned on.

  FIG. 9 is a train ID management table showing a specific example of correspondence between train IDs and video streams. In the train ID management table, vehicle-video correspondence information indicating correspondence between the corresponding vehicle and video information to be displayed is held. The transmission control device 140 acquires the train ID of the corresponding vehicle from the video information request from the vehicle-side wireless transmission unit. The train ID is assigned a unique number in advance for each vehicle. And when the video stream to be displayed for the vehicle is determined, the determined video stream information is sent to the vehicle side device, and the video stream information (vehicle-video correspondence information) associated with the train ID of the corresponding vehicle, The determined video stream number is held in the train ID management table. After that, the transmission control device 140 refers to the train ID management table when receiving a video information request including a train ID from the home side wireless transmission unit, and if there is video stream information associated with the corresponding train ID, A video stream is determined based on the video stream information of the train ID. Note that the video stream information in the train ID management table clears the stored content at the timing when the on-line information is turned off.

  Next, a procedure for determining a transmission target video stream in the transmission control apparatus 140 will be described in detail. FIG. 10 is a flowchart showing a procedure for determining a transmission target video stream in the present embodiment. The transmission control device 140 holds the station configuration information by a combination of the video stream corresponding to each home-side wireless transmission unit described above, the current line information, and the route information, acquires the route information and the current line information from the station, and Determine the standing state. Moreover, based on the link information described above, the connection state between each home-side wireless transmission unit and the vehicle-side wireless transmission unit is determined. A video stream to be displayed on the corresponding vehicle is determined based on the presence state of the vehicle and the connection state of the wireless transmission unit.

  First, whether the transmission control device 140 has received link information from the home side wireless transmission unit (AP) and video information request from the vehicle side wireless transmission unit (STA) connected to the home side wireless transmission unit. Is determined (step S31). If the link information and video information request has not been received, the process ends. When the link information and video information request is received in step S31, the configuration information of the station is referred to and it is determined whether or not there is one video stream associated with the home-side wireless transmission unit in the corresponding link state (step S31). S32). In step S32, when there is one video stream associated with the corresponding home wireless transmission unit on the configuration information, that is, the home wireless transmission unit in the link state transmits only one home video stream. In this case, a video stream to be displayed on the video stream is determined (step S33). For example, in the configuration information example of FIG. 8A, when a video information request is received from the home side wireless transmission unit AP2, only one video stream 2 is associated with the home side wireless transmission unit AP2. Therefore, the video stream 2 is determined.

  In Step S32, when there are a plurality of video streams associated with the corresponding home-side wireless transmission unit on the configuration information, it is subsequently determined whether the video stream information is held in the train ID management table (Step S34). ). Here, when the video stream information is held in the train ID management table, the video stream to be displayed in this video stream is determined (step S33). For example, in the example of the train ID management table of FIG. 9, when the video information request from the vehicle with the train ID 2 is received, the video stream information of the video stream 1 associated with the train ID 2 is held. 1 is determined. In wireless connection, the connection may be interrupted. In such a case, when the video information request is received after reconnection, since the previous video stream information remains in the train ID management table, a video stream similar to the previous video stream is determined based on this video stream information.

  In step S34, if the video stream information is not held in the train ID management table, it is subsequently determined whether there is one on-line information ON (on-line state) corresponding to the link-side home wireless transmission unit ( Step S35). Here, when there is one on-line information ON corresponding to the home-side wireless transmission unit in the link state, the video stream to be displayed in the video stream corresponding to the on-line information ON is determined (step S33). For example, in the example of the configuration information in FIG. 8A, when a video information request is received from the home side wireless transmission unit AP3, the standing line information ON corresponding to the home side wireless transmission unit AP3 is number 1 (present line information [A ] Is determined as the video stream 1 corresponding to the home side wireless transmission unit AP3 and the on-line information [A] ON.

  In step S35, when there are a plurality of on-line information ON corresponding to the link-side home-side radio transmission units, that is, a plurality of vehicle-side radio transmission units are connected in the home-side radio transmission unit covering a plurality of homes. If is in a standing line state, the process of step S36 is subsequently performed. In step S36, it is determined whether or not there is a route information required and the route information storage (route storage) is ON when the on-line information is ON. If there is a condition that satisfies this determination condition, the route storage is turned OFF (step S37), and the video stream to be displayed in the video stream corresponding to the route information stored in the route is determined (step S33). ). For example, in the example of the configuration information in FIG. 8A, when the train (train ID2) is in the existing state in the home A, the train (train ID3) enters the home B and corresponds to the home-side wireless transmission unit AP3. Let us consider a case where the standing line information [A] and [B] are both ON and the route information (2) is ON. In this case, the video stream 2 corresponding to the home side wireless transmission unit AP3, on-line information [B] ON, and route information (2) ON is determined, and the route storage of this route information (2) is turned OFF.

  Here, ON / OFF of the route memory will be described. FIG. 11 is a time chart showing the ON / OFF timing of the route memory. FIG. 11A shows the route memory OFF by the video stream determination, and FIG. 11B shows the route memory OFF by the exclusive control. When the contact information of the route information is input, the route storage is turned on to store the corresponding route information at the timing of the route information OFF when the vehicle passes the predetermined point. Thereafter, the route storage is turned OFF at the timing when the corresponding video stream is determined, and the held route information is cleared. In addition, when the route information is turned on by the input of the first route information and the second route information is input and the route memory is turned on, the previous route information is turned off by the exclusive control. Then, the route information is turned on for the subsequent route information.

  In step S36, if there is no condition that satisfies the above-described determination condition, it is subsequently determined whether there is a track information that does not require route information (ON). Here, if there is one that satisfies this determination condition, the video stream to be displayed in the video stream corresponding to the on-line information ON is determined (step S33). For example, this determination condition may be met depending on the configuration of the station such as a vehicle base, and in this case, the video stream corresponding to the home in the line is determined.

  In step S38, if there is no condition that satisfies the determination condition, a video stream to be displayed in the first video stream corresponding to the home wireless transmission unit in the link state is determined (step S39), and the process is performed. finish.

  By using the above determination algorithm, it is possible to select an appropriate video stream to be displayed for a vehicle that has entered the line. The vehicle-side device can obtain a front position signal and a low-speed signal from the vehicle, but cannot obtain information on which platform is entered. For this reason, when there are a plurality of platforms at a station and a plurality of pieces of video information obtained by photographing the respective homes are transmitted from the home side device to the vehicle side device, the vehicle side device has a plurality of receivable video data. It is not possible to determine which video information should be displayed. Further, in the home side device, it is impossible to determine whether or not the vehicle is really stopped at the home only by connection information such as link information with the vehicle side device. Therefore, using the route information and the standing line information, the transmission control device 140 of the home side apparatus determines the course and the standing line state of the vehicle, and selects video information appropriate for the destination vehicle. Note that it may not be possible to determine which home video stream should be assigned to which vehicle in a state where the vehicle is stopped at each of the plurality of homes only by the presence line information. In such a case, an appropriate video stream is determined by referring to ON / OFF of route information and a history of route storage and considering the route information and on-line information together.

  The video stream of the home video captured by the home side device is always transmitted to the linked vehicle side device. For this reason, in the vehicle side device, when the video stream information indicating the video stream determined for the host vehicle is acquired and the necessary video stream is extracted and displayed based on the video stream information, the video stream is continuously displayed thereafter. It can be acquired and displayed.

  In the description of the above-described embodiment, the procedure for appropriately selecting a home video obtained by photographing a home has been described. However, other video information can be added, or a plurality of videos can be switched and displayed on the vehicle side. It is also possible to provide a camera in the vehicle and transmit the captured video and display it on the display unit of the vehicle side device in the driver's seat, or transmit it to the home side device and display it at the management center or the like. Also, information other than video information can be transmitted and used between the home and the vehicle.

  After determining the video stream by the above determination algorithm, the transmission control device 140 puts this video stream into the video stream information as a first candidate, and also links the home wireless transmission unit in the link state and the adjacent home wireless transmission unit. All the displayable video information is included in the video stream information as the second candidate, the third candidate,. As a result, the vehicle-side device automatically displays the first candidate video information first, and then displays the second candidate and third candidate video information by an operation such as a driver pressing a switching button. It is also possible to do. Thereby, the home video on the opposite side can be displayed, or various information such as other station information, vehicle operation information, news, etc. can be selected and displayed, reproduced, etc. on the vehicle side.

  As described above, in the video transmission system of the present embodiment, bidirectional communication using wireless LAN technology is applied, and video information is converted to IP so that multiple videos can be multiplexed on the same communication path and the communication destination can be flexibly changed. I can do it. In the transmission control device, it is possible to determine appropriate video information to be displayed on the corresponding vehicle by a determination algorithm using route information obtained from the station, on-line information, etc. A display instruction can be given. In particular, when a plurality of homes are covered by a single home-side device and the video information is transmitted to a plurality of vehicles stopped at each home, appropriate video information can be selected. Further, since it can be used for bidirectional communication and one-to-many communication other than video information, it is possible to obtain effects such as effective use of arrangement space and devices, and device cost reduction by multiple distribution of the same video.

  It should be noted that the present invention is not limited to those shown in the above-described embodiments, and those skilled in the art can also make changes and applications based on the description in the specification and well-known techniques. Yes, included in the scope of protection.

  In the above embodiment, an example of application between a train station platform and a vehicle has been described. However, as long as it has track circuit information such as route information and on-line information, it is not limited to a railroad but also to other transportation systems. Applicable.

  In the present invention, one-to-many communication and two-way communication are possible between a station platform and a vehicle, and when transmitting a plurality of information, appropriate information can be selectively exchanged on the transmitting side or the receiving side. It has a possible effect, and is useful as a video transmission system, a video transmission device, and the like for transmitting information including video between a platform of a passenger transportation system such as a railway and a vehicle.

The figure which shows schematic structure of the video transmission system which concerns on embodiment of this invention. The figure which shows schematic structure of the passenger transport system which concerns on this embodiment. The block diagram which shows the detailed structure of the video transmission system of this embodiment Sequence diagram showing video information transmission operation in the video transmission system of the present embodiment The figure explaining course information and standing line information The figure which shows the course information and standing line information corresponding to the structural example of a station The figure explaining the structure information of the station by the combination of standing line information and course information in the structural example of FIG. The figure which showed the setting information corresponding to the combination of track information and course information of FIG. 7 with the table A diagram of a train ID management table showing a specific example of correspondence between train IDs and video streams The flowchart which shows the determination procedure of the transmission target video stream in this embodiment. Time chart showing ON / OFF timing of route memory

Explanation of symbols

100, 500 Station 101 Home 110, 510 Home side device 140 Transmission control device 150, 170 Video transmission unit 151a, 151b, 151c, 151d, 171a, 171b, 171c, 171d Camera 152 Image composition unit 153 Encoder 154 Switch 155 I / O interface 156, 157 Media converter 160, 180 Home side wireless transmission unit (AP)
161 Antenna 200, 300 Vehicle 210, 220, 310, 320 Vehicle-side device 240 Vehicle-mounted device controller 250 Video acquisition unit 251 Switch 252 Decoder 253 Display unit 255 Input / output interface 260 Vehicle-side wireless transmission unit (STA)
261 Antenna 600 Railway network 650 Management center

Claims (5)

A video transmission system for transmitting information including video between the platform of a passenger transport system station and a vehicle,
A home side device provided in or near the home; and a vehicle side device provided in the vehicle;
The home side device
A video transmission unit that generates and transmits video information captured in the home;
A wireless transmission of information including one or a plurality of the video information, a home-side wireless transmission unit capable of one-to-many communication and bidirectional communication with the vehicle-side device;
Track circuit information related to the operation state of the vehicle is acquired from the station, and video information to be displayed on the transmission destination vehicle is determined based on the track circuit information and configuration information regarding the arrangement of the platform of the station and the home side device. And a transmission control unit that outputs video selection information indicating the determined video information,
The vehicle side device
A vehicle-side wireless transmission unit that is wirelessly connected to the home-side wireless transmission unit and capable of bidirectional communication with the home-side device;
Based on the video selection information, a video acquisition unit that outputs video information to be displayed from information transmitted from the home side device;
And a display unit that displays the video information output from the video acquisition unit. The video transmission system according to claim 1,
The transmission control unit uses, as the track circuit information, track circuit information including route information related to the route of the vehicle and track information related to the track status of the vehicle to the home, and further, the home-side radio transmission unit A video transmission system that determines video information to be displayed on the transmission destination vehicle based on connection information of the vehicle-side wireless transmission unit. The video transmission system according to claim 2,
When determining the video information to be displayed, the transmission control unit holds vehicle-video correspondence information indicating a correspondence between the corresponding vehicle and the video selection information, and based on the connection information, the transmission-video correspondence information is stored. A video transmission system that refers to and determines the video information to be displayed based on the video selection information when previous video selection information corresponding to the corresponding vehicle is held. A video transmission device used in a video transmission system for transmitting information including video between a platform of a passenger transportation system station and a vehicle, and serving as a home-side device provided in or near the home,
A video transmission unit that generates and transmits video information captured in the home;
A wireless transmission of information including one or more of the video information, a home-side wireless transmission unit capable of one-to-many communication and bidirectional communication with a vehicle-side device;
Track circuit information related to the operation state of the vehicle is acquired from the station, and video information to be displayed on the destination vehicle is determined based on this track circuit information and configuration information regarding the arrangement of the platform of the station and the home side device. A transmission control unit that outputs video selection information indicating the determined video information;
A video transmission device comprising: A video transmission device that is used in a video transmission system that transmits information including video between a platform of a passenger transportation system station and a vehicle, and is a vehicle-side device provided in the vehicle,
A vehicle-side wireless transmission unit capable of wirelessly transmitting information including one or a plurality of the video information, and capable of bidirectional communication with a home-side device;
In the home side device, video selection information indicating video information to be displayed on the vehicle, determined based on track circuit information on the operation state of the vehicle and configuration information on the arrangement of the platform of the station and the home side device. A video acquisition unit that acquires and outputs video information to be displayed from information transmitted from the home side device based on the video selection information;
A display unit for displaying video information output from the video acquisition unit;
A video transmission device comprising:

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