JP2002169529A - Video display and video display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify connection between individual terminals when a plurality of terminals are disposed, for example, on the inside wall surface of a tunnel in order to provide the passengers of vehicles with frame-fed video by using the plurality of terminals, concerning a video display and a video display method. SOLUTION: A management apparatus 16 carried out data extension and distributes image data D1, and a bus BUS connects terminal units 15AA to 15DJ in series for transmitting image data D1, DU and DS. Furthermore, a management administrator 16 is sequentially switched in accordance with the movement of a moving object, and the timing of this management administrator 16 is controlled to display still pictures by blinking them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device and an image display method, for example, a method in which a plurality of terminal devices are arranged on an inner wall surface of a tunnel, and a frame-advance image is transmitted to a passenger of a vehicle by the plurality of terminal devices. It can be applied when providing. The present invention manages data by distributing image data by decompressing data using a management device, by connecting terminal devices in series by a bus to transmit image data, and the like, and by managing a moving object. The subject is sequentially switched, and the still image is blinked and displayed under the control of the timing of the management subject, so that the connection between the devices can be simplified.

[0002]

2. Description of the Related Art Hitherto, as an image display system, there has been proposed an image display apparatus for providing a frame-advanced image from outside the vehicle to a passenger of a vehicle passing through a tunnel (Japanese Patent Laid-Open No. Hei 5 (1993) -520). -27197, JP-A-5-40
448, JP-A-5-224617, etc.). Such a video display device, for example, arranges an image display device of a terminal at a predetermined interval on a wall in a tunnel, blinks a still image of each frame constituting a moving image on each image display device, and thereby moves a vehicle. It is designed to be able to provide frame-by-frame images to the passengers (including passengers as well as passengers) within the vehicle.

FIG. 10 is a block diagram showing a conventional video display device. This video display device 1 is an MPE
It receives a file F of a moving image that has been data-compressed in the format of G (Moving Picture Experts Group) and displays the moving image of this file F.

For this reason, in the video display device 1, the host device 2 inputs a file F and a schedule of a moving image from an upper-level server (not shown), and
Keep schedule. Further, the host device 12 decompresses the file F of the moving image in accordance with the held schedule, and converts the image data D1 of each frame constituting the moving image into, for example, LVDS (Low Voltage Differential Signaling).
g), and is transmitted to the terminal devices 3A to 3X in a format such as GVIF (Gigabit Video Interface).

[0005] The terminal devices 3A to 3X are arranged at predetermined intervals, for example, along the inner wall surface of the tunnel, and blink the image data D1 transmitted in this manner. That is, in the terminal devices 3A to 3X, the image display device 4 has a transmissive liquid crystal display panel or the like with a fixed resolution, and the liquid crystal display panel displays a still image based on the image data D1. The blinking illumination device 5 is a backlight device disposed on the back of the liquid crystal display panel in the image display device 4, and supplies illumination light to the liquid crystal display panel. In the supply of the illumination light, the blinking illumination device 5 operates in synchronization with the pulse signal PL to intermittently supply the illumination light to the liquid crystal display panel at a cycle corresponding to the passing speed of the vehicle. Flashing display of a still image.

The entry-side speed detection unit 6 and the exit-side speed detection unit 7 are arranged at both ends of the continuous terminal devices 3A to 3X and on the entry and exit sides of the train, respectively, and detect the speed of the train. The exit-side speed detection unit 7 notifies the entry-side speed detection unit 6 of the speed detection result, and the entry-side speed detection unit 6
Outputs a pulse signal PL at a period corresponding to the train speed, based on the speed detection results on the approach side and the exit side obtained in this way.

As a result, in the image display device 1,
A frame-advance image by a still image of each of the terminal devices 3A to 3X is provided through a window to a passenger of a vehicle passing in front of the terminal devices 3A to 3X. Further, at this time, these still images are blinked and displayed at a cycle corresponding to the speed of the vehicle, so that the moving image image by these frame feeds can be viewed at a position where the vehicle is stationary from the occupant of the vehicle.

[0008] When providing a moving image by frame advance in this manner, the video display device 1, as shown in FIG.
The terminal devices 3A to 3X are grouped, and one terminal device 3C,..., 3V of the master device is set in each group, and the remaining terminal devices 3A, 3B, 3C, 3F of the child devices are set.
... 3T, 3U, 3W, and 3X are set. In the video display device 1, the image data D1 is transmitted from the host device 2 via the terminal device of each master device so as to branch to the terminal devices of slave devices of each group.

[0009]

However, the conventional video display device 1 has a problem that the connection between the devices is complicated. That is, in practice, in the video display device 1, the image data D 1 is transmitted between the terminal devices 3 A to 3 N and the host device 2.
And a cable for transmitting the pulse signal PL is required.
When monitoring the operation of each of the terminal devices 3A to 3X,
For example, a cable for transmitting a monitoring result such as whether or not the blinking illumination device 5 emits light correctly in each of the terminal devices 3A to 3X is also required. In particular, in a case where the system is expanded by adding such terminal devices 3A to 3X, the complexity of such a connection is significantly increased.

[0010] Further, even when only the image data D1 is transmitted, there is a problem that the connection is complicated because it is necessary to connect the cable while distinguishing the master unit and the slave unit.

Incidentally, when the image data D1 is distributed in such a manner as to be decompressed and branched by the host device 2, the distribution of the image data D1 from the host device 2 takes time. Further, even when the system is expanded, the master unit related to the expanded terminal device is placed in the same network segment, and the network may be saturated due to collision. Further, in some cases, the host device 2 serving as the image server may be overloaded due to the distribution of the image data D1, and the image update may fail. In the distribution of such image data D1, CSMA on the premise of many-to-many two-way communication is used.
/ CD (Carrier Sense Multiple Access with Collisi
On detection) method may be adopted, but this method has a disadvantage that the transmission efficiency decreases as the occupation rate of the communication band increases.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a video display device and a video display method capable of simplifying connection between devices.

[0013]

According to the first aspect of the present invention, in order to solve the above-mentioned problems, the present invention is applied to a video display device, and a management device converts image data transmitted from a higher-level device after data compression. The data is decompressed and sent to the terminal device connected in series, and the terminal device connected in series sequentially transmits the image data input from one end to the other end and selectively selects the image data assigned to the own device. And a still image is displayed based on the obtained image data.

In the invention according to claim 4, the present invention is applied to a video display device, a management device and a plurality of terminal devices are sequentially connected by a bus, and a management device and a plurality of terminal devices are connected in series. The management device distributes at least image data to be used for blinking display via the bus, and controls timing of blinking display.

In the invention according to claim 5, the present invention is applied to a video display device, wherein a plurality of management devices move the entire management subject to a successive management device in accordance with the movement of a moving object,
The timing of blinking display of a predetermined number of terminal devices assigned to each is controlled based on the speed detection result by the management device of the management subject.

According to the sixth aspect of the present invention, the present invention is applied to a video display method, and in a management apparatus, image data compressed and transmitted from a higher-level apparatus is decompressed and transmitted to a terminal apparatus by serial connection. In the terminal device connected in series, the image data input from one end is sequentially transmitted to the other end, and the image data assigned to the own device is selectively obtained, and the obtained image data is Display an image.

In the invention according to claim 8, the management device and the plurality of terminal devices are sequentially connected by a bus, and the management device and the plurality of terminal devices are connected in series. At least image data used for blinking display is distributed by the management device via the bus, and the timing of blinking display is controlled.

According to a ninth aspect of the present invention, there is provided an image display method, wherein, in a plurality of management devices, an entire management subject is shifted to a successive management device in accordance with movement of a moving body, The timing of blinking display of a predetermined number of terminal devices assigned to each of them is controlled based on the speed detection result by the management device.

According to the configuration of the first aspect, the management device includes:
The image data transmitted by being compressed and transmitted from the host device is decompressed and sent to the terminal device connected in series, and the terminal device connected in series transmits the image data input from one end to the other end sequentially. At the same time, by selectively acquiring image data assigned to the own device and displaying a still image based on the acquired image data, the management device can be distinguished from the parent device and the child device as in the related art. Image data can be distributed by connecting a terminal device. Thereby, the connection can be simplified accordingly.

According to the fourth aspect of the present invention, the management device and the plurality of terminal devices are sequentially connected by a bus, and the management device and the plurality of terminal devices are connected in series.
By distributing at least image data to be used for blinking display by a bus and controlling timing of blinking display,
The connection for the timing control of the blinking display and the connection for the image data distribution can be collectively executed simply by sequentially connecting the continuous devices, and the connection work can be simplified accordingly.

According to the fifth aspect of the present invention, the plurality of management apparatuses move the entire management subject to the succeeding management apparatus in accordance with the movement of the moving body, and the speed of the management subject is controlled by the management apparatus. In the case where expansion and the like are executed in units of a management device and a terminal device managed by the management device by controlling the timing of blinking display of a predetermined number of terminal devices assigned to each based on the detection result. Can be dealt with by simple connection.

Accordingly, claims 6, 8 and 9 are provided.
According to the configuration described above, it is possible to provide a video display method capable of simplifying the connection between devices by comparing with the configurations of claims 1, 4, and 5, respectively.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) Configuration of the Embodiment FIG. 1 is a block diagram showing the basic configuration of a video display device according to the present invention. The video display device 11 includes a display unit 14 and a host device 12 that distributes image data, and a slave unit master 13 that is a control device disposed at the end.
Are connected. Here, this display unit 14
Are 90 terminal devices 15AA to 15D connected in series
J and a unit master 16 which is a control device having a configuration similar to that of the slave unit master 13.

As shown in FIG. 3, the video display device 11
These host device 12 and slave unit master 13
On the other hand, the display units 14 are connected in series by a predetermined number of stages, so that the number of terminal devices 15AA to 15DJ to be displayed can be freely set, whereby images with various frame numbers can be displayed. I have.

Here, the host device 12 receives a file F of image data to be displayed from a server (not shown) together with a schedule, and holds the file F in a predetermined storage means. Here, the file F of the image data is divided for each display unit 14, and is compressed and transmitted according to the MPEG format and transmitted. Host device 12
Records and holds the image data D1 input in this way in a recording means such as a hard disk device without data decompression, and stores each of the display units 1 according to a schedule.
4 At this time, the host device 12 transmits the corresponding image data D1 to the unit master 16 of each display unit 14 in a state where the data is compressed, and transmits the terminal device 15AA of each display unit 14 via these unit masters 16. The image data D1 is distributed to ~ 15DJ.

By storing and distributing the data in a compressed state as described above, the host device 12 holds the image data D1 by a recording unit having a smaller capacity than in the conventional configuration, and furthermore, Is designed to deliver the image data D1 in a short time.

FIG. 3 is a flowchart showing a processing procedure of the host device 12 relating to the distribution of the image data D1. When the host device 12 starts the operation, it proceeds to step S
The process proceeds from P1 to step SP2, and it is determined from the recording of the schedule whether or not it is the change time of the image data D1 to be displayed on the terminal devices 15AA to 15DJ. If a negative result is obtained here, the host device 12 repeats step SP2. On the other hand, if a positive result is obtained in step SP2, the host device 12 proceeds to step SP3.

Here, the host device 12 issues a load instruction of the image data D1 to the unit master 16 of each display unit 14. Subsequently, the host device 12 proceeds to step SP4, and determines whether a data request has been obtained from the unit master 16 by this load command. Here, if a negative result is obtained, the host device 12 proceeds to step S
When P4 is repeated and a positive result is obtained, the process proceeds to step SP5.

Here, the host device 12 sends out the image data D1 corresponding to the unit master 16 which has requested the data in a state where the data is compressed, and then proceeds to step SP2.
Return to

The host device 12 is an IEEE 802.3C
A network N1 (FIGS. 1 and 2) which is almost the same as that set as the SMA / CD standard, and has a transmission speed of 10
Such image data D1 is distributed via the [Mbps] network. Thereby, in this video display device 1, the terminal devices 15AA to 15DJ of each display unit 14 are provided.
, The image data D1 is transmitted via the unit master 16 in charge of each of them, so that the number of nodes in the network can be reduced by that much, and the load on the network N1 can be reduced. Has been made.

Further, the host device 12 receives the operation status information DS of each of the terminal devices 15AA to 15DJ from each unit master 16 via the network N1 and notifies the information DS to the transmission source of the file F. Thus, even when the video display device 11 is installed in a tunnel and monitoring is difficult, the operation status can be monitored from a remote location.

Each of the slave unit master 13 and the unit master 16 is a computer having a speed detecting mechanism, and executes a predetermined process according to an operation mode setting. In this way, in this video display device 11, after 90 terminal devices 15AA to 15DJ and the unit master 16 are sequentially connected to the last slave unit master 13, the operation mode of the slave unit master 13 is changed to the unit mode. The display unit 14 can be added by setting the operation mode of the master unit 16 to the operation mode of the slave unit master 13 in addition to the operation mode of the unit master 16 that is the last one. Conversely, the last slave unit master 13 and the last slave unit master 13 are connected.
The display units 14 can be reduced by removing the zero terminal devices 15AA to 15DJ and setting the operation mode of the last unit master 16 to the operation mode of the slave unit master 13. Has been made.

Thus, in the video display device 11, the system can be variously and flexibly changed by simple operations as needed. Further, by configuring the slave unit master 13 and the unit master 16 by switching the operation mode of one computer as described above, the system can be configured with a simple configuration correspondingly.

The unit master 16 decompresses the image data D1 provided from the host device 12,
Terminal devices 15AA to 15D of the display unit 14 in charge
Deliver to J. At this time, the unit master 16 sends the terminal devices 15AA to 15A to the respective frames of the image data D1.
An ID code specifying 15DJ is set and distributed.

FIG. 4 shows each unit master 1
6 is a flowchart illustrating a processing procedure related to image data distribution of No. 6; When the unit master 16 starts operation,
The process moves from step SP11 to step SP12, where it is determined whether or not an image data load command has been input from the host device 12. Here, if a negative result is obtained, the unit master 16 repeats step SP12, whereas if a positive result is obtained, the unit master 16 proceeds to step SP13.

Here, the unit master 16 changes the state to the image data loading state for loading the image data D1 from the host device 12. In step SP14 following this transition, the unit master 16 issues an image data load instruction to the terminal devices 15AA to 15DJ in charge. Subsequently, the unit master 16 proceeds to step SP
In step SP16, a request is made to the host device 12 to load the image data D1, and in step SP16, data expansion of the image data D1 transmitted in response to the request is started.

As described above, when the data expansion of the image data D1 is started and the data expansion for one frame is completed,
The unit master 16 proceeds to step SP17, sets the identification code ID specifying the terminal devices 15AA to 15DJ in the image data D1 for this one frame, and transmits the image data D1 for this one frame in step SP18. When the unit master 16 transmits the image data D1 for one frame in this manner, the subsequent step SP1
9, the image data D input from the host device 12
It is determined whether the transmission to the terminal devices 15AA to 15DJ has been completed for No. 1. If a negative result is obtained here, the process returns to step SP16 to execute data expansion and data distribution for the next one frame. On the other hand, when a positive result is obtained, the process returns to step SP12.

As a result, in the video display device 11, as shown in FIG.
The image data D1 is transmitted to the unit master 16 of the terminal device 15A.
The image data D1 is distributed to A to 15DJ. As a result, in the video display device 11, the time required for transmitting the image data can be shortened as compared with the related art, and the overload of the host device 12 can be effectively avoided.

In the slave unit master 13 and the unit master 16, the speed detecting mechanism has one set of imaging means, and detects the entry of the train by comparing the imaging results of the one set of imaging means. When the slave unit master 13 and the unit master 16 detect the entry of the train by the speed detecting mechanism, the slave unit master 13 and the other unit masters 16 assert the token and switch the operation mode to the active unit master. Further, the active unit master detects the speed of the train, and the terminal device 15A corresponding to the detected speed.
The timing of blinking display of A to 15DJ is detected. In this way, the slave unit master 13 and the unit master 16 set the timing of the blinking display so that the video of frame-by-frame display by blinking display appears to be stationary when viewed from the passengers of the train.

The slave unit master 13 and the unit master 16 transmit speed information D based on the timing information.
U is allocated in place of its own identification code to form a frame, which is transmitted to the slave unit master 13 and another unit master 16. Thus, in the video display device 11, the timing of blinking display is transmitted by the speed information DU, and such timing information can be transmitted together with other information.

On the other hand, the slave unit master 13
Or, when a token is claimed by another unit master 16, the slave unit master 1 that claims this token
The speed information DU sent from the third or other unit master 16 is sequentially transmitted. At this time, if the slave unit master 13 and the other unit masters 16 switch the operation mode to the active unit master and transmit the speed information DU, they switch the operation mode to change the speed information DU.
Stop sending. Note that the slave unit master 13
Returns to the normal operating mode when the train passes and the speed cannot be detected.

Thus, the slave unit master 1
As shown in FIG. 6, the unit master 3 and the unit master 16 are connected in series via the terminal devices 15AA to 15DJ which are connected in series, and the speed information DU obtained from the unit master 16 on the ingress side is determined on the exit side. Unit master 1
6, the speed information DU obtained from the slave unit master 13 and the unit master 16 on the exit side is transmitted to the unit master 16 on the ingress side. It has been done.

As shown in FIG. 8, when the train T moves sequentially, the unit master 16 and the slave unit master 13 immediately after the head of the train T sequentially pass through the image display device 11 sequentially become the active unit master ( The operation mode is switched to that indicated by reference numeral A), and the speed information DU detected by the active unit master A is transmitted to the other unit masters 16 and slave unit masters 13.

Further, in a state other than the active unit master A, the unit master 16 and the slave unit master 13 effectively utilize the speed information transmitted from the active unit master A to determine the speed detection result by the speed detecting mechanism. to correct. As a result, the unit master 16 and the slave unit master 13 predict the train speed detected by their own speed detection mechanisms by linearly approximating the speed information DU obtained from the slave unit master 13 and the other unit masters 16. Then, the speed detection result is corrected so that the predicted value matches the speed detection result. Thus, in the video display device 11, a plurality of unit masters 16 and a plurality of slave unit masters 13 each having a speed detection mechanism are arranged as described above, and further, a configuration for sequentially transmitting the speed detection results by these units is effectively used. Thus, the speed detection accuracy is improved.

The unit master 16 and the slave unit master 13 are connected to the last terminal device 15DJ of the immediately preceding display unit 14 by the same bus BUS as the bus BUS for connecting terminal devices 15AA to 15DJ, which will be described later, and the terminal device 15AA in charge. Terminal device 15A at the head of ~ 15DJ
A, and transmits the speed information DU via the bus BUS. Thereby, in the video display device 11, the connection between the devices can be simplified.

As shown in FIG. 1, the terminal devices 15AA to 15DJ are sequentially connected by a predetermined bus BUS and are connected in series. Further, the first terminal device 15AA is connected to the unit master 16 in charge and the last terminal device 15AA. The device 15DJ is connected to the unit master 16 or slave unit master 13 of the subsequent display unit. Terminal devices 15AA-15
The DJ sequentially transmits the speed information DU between the unit master 16 and the slave unit master 13 via the bus BUS, and blinks and displays a still image based on the speed information DU.
Further, the image data D1 distributed from the unit master 16 is sequentially transmitted through the bus BUS. Here, the bus BUS is configured by a multi-wire cable having the same shape as that of the RS485. As a result, the image display device 11
It can be set up by simply routing cables simply by connecting each device sequentially with the book cable. Thereby, in the video display device 11, the connection between the devices is simplified.

FIG. 8 shows these terminal devices 15AA to 15D.
FIG. 3 is a block diagram showing a configuration of J. Terminal device 15AA ~
15DJ is connected to the front and rear buses BUS via input / output circuits 21 and 22, which are interface circuits, respectively. The video control circuit 23 converts the image data D1 into a built-in FIFO (First In First Out) 2 based on various data obtained through the input / output circuit 21 on the unit master 16 side.
4, the input / output circuit 22 on the terminal device side.
Output more. In this process, the video control circuit 23
Monitors the identification code ID set in the image data D1, and when the image data D1 in which the identification code ID designating the own device is set is input, the image data D1 is stored in the memory 25 as an image memory. To load. The video control circuit 23 drives the liquid crystal display panel 26 with the image data D1 held in the memory 25, and thereby displays the image data D1 distributed from the host device 12 via the unit master 16.

FIG. 9 shows the video control circuit 23
6 is a flowchart showing the processing procedure of FIG. When the power is turned on, the video control circuit 23 proceeds from step SP31 to step SP32, and determines whether or not an instruction to load the image data D1 has been input from the unit master 16, and if a negative result is obtained here, Repeat SP32.

On the other hand, if a positive result is obtained in step SP32, the process proceeds to step SP33. Here, the video control circuit 23 determines, for the image data D1 sequentially transmitted from the unit master 16, whether or not the identification code ID set in the image data D1 matches the identification code ID for specifying its own device, If a positive result is obtained, the process moves to step SP34, and the image data D1 is stored in the memory 2
5 and the process moves to step SP35. On the other hand, if a negative result is obtained in step SP33, the video control circuit 23 directly proceeds to step SP35 and transfers the image data D1 to the subsequent terminal device.

The video control circuit 23 operates as described above.
When the processing of the image data D1 for the frame is completed, it is determined whether or not a stop of the processing has been notified from the unit master 16. If a negative result is obtained here, the process returns to step SP33, whereas a positive result is obtained. And step SP3
Return to 2. As a result, in the video display device 11, as viewed from the unit master 16, continuous processing is performed by a simple process of setting an identification code ID for specifying each of the terminal devices 15 AA to 15 DJ and sequentially transmitting the image data D 1 to the bus BUS. The image data D1 can be efficiently distributed.

Further, the video control circuit 23 monitors the operation state and the like of the liquid crystal display panel 26 and notifies the control circuit 27 when any abnormality is detected.

The control circuit 27 outputs the speed information DU obtained from the input / output circuit 21 from the input / output circuit 22. Conversely, the speed information D obtained from the input / output circuit 21 is
U, the operation status information DS is output from the input / output circuit 21. The control circuit 27 blinks the strobe 28 via a predetermined drive circuit based on the speed information DU transmitted in this way. Here, the strobe 28 is arranged on the back of the liquid crystal display panel 26 to illuminate the liquid crystal display panel 26. Thereby, the terminal devices 15AA to 15D
In J, a still image is blinked and displayed on the liquid crystal display panel 26.

In this process, the control circuit 27 monitors the flashing of the strobe 28 by a monitoring mechanism arranged in the drive circuit. When an abnormality is detected by this monitoring, and when an abnormality is detected by the video control circuit 23, the control circuit 27 uses the abnormality as the operating state information DS to the bus BUS via the input / output circuit 21 on the upstream side. Send out. Thus, in the terminal devices 15AA to 15DJ, one bus BU
S, connected in series and connected in series.
Thus, the distribution of the image data D1, the timing control of the blinking display, and the notification of the abnormal operation are notified, and the connection work can be simplified accordingly.

(2) Operation of Embodiment In the above configuration, in the image display device 11 (FIGS. 1 and 2), for example, an image is provided to a passenger of a train that is placed in a tunnel and passes through the tunnel. I do. The image display device 11 displays each frame of this image for this purpose.
0 terminal devices 15AA to 15DJ and unit master 1
6, the number of display units 14 corresponding to the number of frames of the video to be displayed is selected. The video display device 11 transmits the terminal device 15 to the predetermined number of display units 14 thus selected.
AA to 15DJ are arranged in the tunnel at predetermined intervals. Further, a unit master 16 is disposed between the display units 14, and a slave unit master 13 is disposed at the end. The host device 12 is arranged at a predetermined position.

The image display device 11 includes the unit master 16 and the terminal devices 15AA to 15D arranged as described above.
J and the slave unit masters 13 are sequentially connected by the bus BUS. As a result, the video display device 11 allows each of the display units 14 to have the terminal devices 15AA to 15DJ.
Are connected in series. In each of the display units 14, a unit master 16 is connected to one end of each of the terminal devices 15AA to 15DJ connected in series by a bus BUS. In addition, looking at the terminal devices 15AA to 15DJ connected in series for each display unit 14, the unit master 16 is arranged between the terminal devices 15AA to 15DJ connected in series by the bus BUS.

Further, the image display device 11 is configured such that the unit master 16 and the slave unit master 13 thus arranged are connected to the host device 12 by the network N1.
The host device 12 is connected to a management center or the like.

The video display device 11 is installed in this manner, and the image data D1 obtained by data compression from the management center is distributed to the host device 12 and held. Further, the image data D1 is delivered from the host device 12 to the unit master 16 of each display unit 14 in a state where the data is compressed (FIG. 3), and the data is expanded in each unit master 16. Thereby, in the video display device 11, only one display unit 14 is provided.
When the system is configured by the network N1
If two nodes are formed above and the display unit 14 is added, the network N1 can be configured and the image data can be distributed from the host device 12 by increasing the number of nodes by the number of the added units. As a result, by distributing the image data D1 in a state where the data is compressed, the load on the network N1 can be significantly reduced in the video display device 11 as compared with the related art. Actually, as compared with the case where the system is configured by 90 terminal devices according to the conventional configuration and the image data D1 is distributed, the image data D1 compressed by MPEG2
1, the load on the network N1 can be reduced to about 1/100, and a decrease in transmission efficiency can be effectively avoided. Further, the time required for distributing the image data D1 can be significantly reduced as compared with the related art.

The image data D1 is transmitted to the unit master 16 by compressing the data, and the data is decompressed by the unit master 16.
2, the recording capacity of the image data D1 is 1
/ 100 can be reduced.

In the video display device 11, the terminal devices 15AA to 15AA to 1 frame by frame are applied to the image data D1 thus decompressed by the unit master 16.
An identification code ID specifying 5DJ is added, and the bus B
Sent to US (FIGS. 4 and 5). Further, in each of the terminal devices 15AA to 15DJ, the image data D1 sent to the bus BUS is sequentially transmitted to the subsequent terminal device. In this transmission, each of the terminal devices 15AA to 15DJ is referred to based on the identification code ID. Image data D1 corresponding to
Is selectively taken in (FIGS. 8 and 9).

As a result, in the unit master 16, the image data D1 whose data has been expanded is simply identified by the identification code I.
The image data D1 can be distributed in a short time by a simple process of setting D and sending it to the bus BUS.
As a result, in the video display device 11, the time required for distributing the image data D1, which is the time required for switching the video, can be significantly reduced as compared with the related art. In addition, terminal devices 15AA to 15DJ are connected by bus BUS.
Are connected in series and the image data D1 is distributed, and the image data D1 is selectively acquired and displayed, thereby simplifying the connection operation between the apparatuses.

In the state where the image data D1 has been distributed in this way, when the train enters the image display device 11, the entry of the train is detected by the unit master 16 arranged on the most approach side, and the speed of the train is reduced. Detected repeatedly. In the image display device 11, upon detection of the entry of the train, the unit master 16 rises to the active unit (FIG. 7), and based on the measurement result, the speed information DU indicating the timing of blinking display is transmitted to the other unit master 16.
Is transmitted to

In the video display device 11, the control entity for controlling the timing of such blinking display is sequentially switched with the movement of the train, and the speed information DU by the unit master 16 by the switched control entity is transmitted to the bus BUS. Is transmitted to each display unit 14 via the. When the train passes in front of the slave unit master 13, the slave unit master 13 rises to the active unit and switches to the control subject.

In the video display device 11, the speed information DU at which the control subject is sequentially switched and the transmission direction is switched in this manner is also converted to the terminal devices 15AA to 15AA connected in series.
Each unit master 1 by bus BUS via 15DJ
6 (FIG. 6), whereby the transmission of the image data D1 and the transmission of the speed information DU share the cable. In the video display device 11, this can also simplify the connection between the devices.

In the image display device 11, the terminal devices 15AA to 15DJ in charge in each unit master 16 are displayed blinking on the basis of the speed information DU transmitted in this manner, so that a moving image can be displayed to the train passengers. Provided.

In transmitting the speed information DU in this manner, in the video display device 11, the display unit 14
Also, the image data D
The speed information DU is transmitted by the same bus BUS as the bus BUS used for the transmission of No. 1. Thus, in this embodiment, the unit master 16 and the terminal devices 15AA to 15D
J, without distinguishing the slave unit master 13
The devices can be connected and installed by the same cable, and the connection work between the devices can be simplified accordingly.

In the video display device 11, by transmitting the speed information DU by sequentially switching the control subjects in this way, each unit master 16 can obtain the speed detection result of the other unit masters 16. . In the video display device 11, the speed detected by each unit master 16 is predicted from the speed detection result by the other unit masters 16. Further, the detected speed is corrected based on the predicted speed, and thereby variations in speed detection accuracy among the unit masters 16 and changes over time are corrected, thereby improving speed detection accuracy. As a result, in the video display device 11, a still image can be blinked and displayed according to the moving speed of the train, so that, for example, the occupant can stop and watch a moving image.

When the still image is blinked in this manner, each of the terminal devices 15AA to 15DJ uses the strobe 2
8 and the operation of the liquid crystal display panel 26 are monitored. If an abnormality is detected, the operation status information DS is sent back to the unit master 16 by tracing back the bus BUS used for transmitting the image data D1. Notified. Further, the host device 12 is transmitted from the unit master 16 via the network N1.
And the host device 12 notifies the management center. As a result, the operation of the video display device 11 is also monitored by the bus BUS used for distributing the image data D1, and the entire connection operation can be simplified accordingly.

As described above, by connecting the terminal devices in series via the bus BUS and transmitting image data and the like,
In the video display device 11, the system can be configured by one type of terminal device without preparing two types of terminal devices corresponding to the parent device and the child device as in the video display device of the conventional configuration. Also, the overall configuration can be simplified.

(3) Operation of the Embodiment According to the above configuration, the terminal devices are sequentially connected in series by the bus BUS, connected to the unit master 16 which is the management device, and the data is expanded by the unit master 16. By distributing the image data D1 to each terminal device, the connection work between the devices can be simplified with respect to the setting of the transmission path of the image data D1.

Further, by adopting a configuration in which such unit masters 16 are arranged for every predetermined number of terminal devices, the terminal devices managed by the unit master 16 are unitized and the system is expanded by adding such units. The configuration can be changed easily and flexibly.

Also, by connecting the terminal devices in series via the bus BUS and transmitting image data, speed information, and the like,
Connection work between terminal devices can be simplified.

The management subject is sequentially switched in accordance with the movement of the moving body, and the still image is displayed in a blinking manner by controlling the timing of the management subject. By connecting the display units in series, the timing of the blinking display in each display unit is controlled. Can be controlled, whereby the connection between the devices can be simplified with respect to the connection between the display units.

The speed detection result can be improved by correcting the speed detection result by each unit master and slave unit master based on the speed detection result obtained by the control subject in this way.

(4) Other Embodiments In the above-described embodiment, the case where image data is sequentially transmitted from the train entry side has been described, but the present invention is not limited to this, and transmission is performed from the train exit side. In this case, the present invention can be widely applied to transmission from the center of the display unit row to the entrance side and the exit side.

In the above-described embodiment, a case has been described in which the speed is detected by comparing the imaging results obtained by a pair of imaging means. However, the present invention is not limited to this, and for example, a light transmission type sensor may be used to detect the speed of the wheel. It can be widely applied to the case where the speed is detected by various methods, such as the case where the speed is detected by detecting the passage.

Further, in the above-described embodiment, the image based on the still image is stopped and viewed by the passenger.
Although the case where the still image blinks according to the speed of the vehicle has been described, the present invention is not limited to this, and is widely applied to, for example, a case where the image based on the still image is displayed so as to move slowly as seen from the passenger. Can be applied.

In the above-described embodiment, a case has been described in which a moving image is displayed by blinking a still image. However, the present invention is not limited to this, and passengers can be displayed by blinking the same still image. A video of a still image such as a sign or an advertisement may be displayed so that the driver can easily recognize it.

Further, in the above-described embodiment, a case has been described in which a frame-advancing image is provided to a vehicle occupant by flashing a still image in a tunnel, but the present invention is not limited to this. When providing frame-by-frame images to car passengers in a tunnel, or when providing frame-by-frame images at the side of a road or railroad at night, or when providing frame-by-frame images at an amusement park, etc. The present invention can be widely applied to a case where video images are provided by frame advance to passengers of various moving objects.

[0080]

As described above, according to the present invention, the data is decompressed by the management device and the image data is distributed.
In addition, by connecting terminal devices in series via a bus to transmit image data and the like, and further sequentially switching the management subject in accordance with the movement of the moving body, a still image is blinked and displayed by controlling the timing of the management subject. Thereby, the connection between the devices can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a video display device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration in which a display unit is added to the basic configuration of FIG.

FIG. 3 is a flowchart illustrating a processing procedure of the host device of FIG. 1;

FIG. 4 is a flowchart illustrating a processing procedure of a unit master in FIG. 1;

FIG. 5 is a block diagram for explaining distribution of image data in the configuration of FIG. 1;

FIG. 6 is a block diagram for explaining transmission of speed information in the configuration of FIG. 1;

FIG. 7 is a block diagram for explaining switching of a control subject in the configuration of FIG. 1;

FIG. 8 is a block diagram illustrating a terminal device.

FIG. 9 is a flowchart illustrating a processing procedure in the terminal device.

FIG. 10 is a block diagram showing a conventional video display device.

11 is a block diagram for explaining distribution of image data in the video display device in FIG. 10;

[Explanation of symbols]

1, 11 ... video display device, 2, 12 ... host device,
3A to 3X, 15AA to 15DJ ... terminal device, 13 ...
... Slave unit master, 14 ... Display unit, 1
6 Unit master

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C006 AA02 AF71 FA16 FA42 5C080 AA10 CC10 DD23 EE25 FF07 JJ02 JJ07 KK20 5C082 AA02 AA34 BA12 BD02 BD06 CA01 CB01 CB03 DA86 MM02 MM04

Claims (9)

[Claims] 1. A video display device for providing a frame-advance image by a still image to a occupant of the moving body by blinking and displaying a still image at predetermined intervals along a route of the moving body. A plurality of terminal devices that are connected in series and are sequentially arranged at predetermined intervals along the path of the moving object, each of which flashes and displays the still image, and a terminal device at one end of the terminal device that is connected in series. A management device that is connected and distributes image data transmitted from a higher-level device to the terminal device by the serial connection, wherein the management device is configured to transmit the image compressed and transmitted from the higher-level device. The data is decompressed and sent to the serially connected terminal device, and the serially connected terminal device sequentially transmits the image data input from the one end to the other end. A video display device, characterized in that the image data assigned to the own apparatus selectively acquires and displays the still image by the image data obtained by said obtaining. 2. The management device, wherein a plurality of the management devices are arranged for every predetermined number of the terminal devices, and the predetermined number of the terminal devices are connected in series to the corresponding management devices, respectively. The video display device according to claim 1, wherein: 3. The management device according to claim 1, further comprising: speed detecting means for detecting a speed of the moving object; and control means for controlling timing of the blinking display based on a detection result by the speed detecting means. The video display device according to claim 1. 4. A video display apparatus for providing a frame-by-frame image of a still image to a occupant of the moving body by blinking and displaying a still image at predetermined intervals along a route of the moving body. A plurality of terminal devices sequentially arranged at predetermined intervals along a route of the moving object, each of which is arranged to blink the still image and display at least one end of the plurality of terminal devices; A management device for detecting and controlling the timing of the blinking display according to the speed detection result, and distributing image data transmitted from a higher-level device to the plurality of terminal devices. Are sequentially connected by a bus, and the management device and the plurality of terminal devices are connected in series. The management device is configured to provide at least the blinking display by the bus. Deliver data, image display apparatus and controls the timing of the blink. 5. A video display apparatus for providing a frame-by-frame image of a still image to a occupant of a moving body by blinking and displaying a still image at predetermined intervals along a route of the moving body. A plurality of terminal devices sequentially arranged at predetermined intervals along the route of the moving body, each of which blinks and displays the still image, and a plurality of terminal devices are arranged for each of the plurality of terminal devices,
A plurality of management devices each for detecting the speed of the moving body, wherein the plurality of management devices move the entire management subject to a successive management device with the movement of the moving body, A video display device, wherein the timing of blinking display of the predetermined number of terminal devices assigned to each of them is controlled based on a speed detection result by a management device of a management subject. 6. The video display device according to claim 5, wherein the management device corrects the speed detection result based on a speed detection result obtained from the management device of the management subject. 7. A video display method for providing a frame-by-frame image of a still image to a occupant of the moving body by blinking and displaying a still image at predetermined intervals along a route of the moving body. A plurality of terminal devices each of which blinks and displays the still image are connected in series, sequentially arranged at predetermined intervals along the path of the moving object, and transmitted from a higher-order device to one end of the terminal device by the serial connection. A management device for distributing the image data to be transmitted to the terminal device by the serial connection, wherein in the management device, the image data transmitted by being compressed and transmitted from the higher-order device is subjected to data expansion and the serial connection. In the terminal device connected in series, the image data input from the one end is sequentially transmitted to the other end, and assigned to its own device. Image display method characterized by being an image data selectively acquired was, displaying the still image by the image data obtained by said obtaining. 8. A video display method for providing a frame-by-frame image of a still image to a occupant of the moving body by blinking and displaying a still image at predetermined intervals along a route of the moving body. A plurality of terminal devices each of which blinks and displays the still image are sequentially arranged at predetermined intervals along the path of the moving object, and at least at one end of the plurality of terminal devices, the speed of the moving object is detected, and the speed is detected. While controlling the timing of the blinking display according to the detection result, a management device for distributing image data transmitted from a higher-level device to the plurality of terminal devices is arranged, and the management device and the plurality of terminal devices are buses. , The management device and the plurality of terminal devices are connected in series, and the management device distributes at least the image data provided for the blinking display via the bus. And controlling the timing of the blinking display. 9. A video display method for providing a frame-advance image by a still image to a occupant of the mobile body by blinking and displaying a still image at predetermined intervals along a route of the mobile body. A plurality of terminal devices each of which blinks and displays the still image at predetermined intervals along a route of the moving object, and for each of a predetermined number of the plurality of terminal devices, a plurality of detecting the speed of the moving object. A plurality of management devices are arranged, and in the plurality of management devices, as a result of the movement of the moving body, the entire management subject is transferred to a successive management device, and a speed detection result by the management device of the management subject is provided. Controlling the timing of blinking display of the predetermined number of terminal devices assigned to each of the plurality of terminal devices.