JP2009021894A - Video distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video distribution system for delivering video data regardless of changes in communication state in a network by keeping quality of the video data. <P>SOLUTION: The video distribution system includes a network, a plurality of user terminals 6a, 6b, 6c and 6d connected to the network, and a video distribution server 1. The video data stored in an HDD of the video distribution server 1 includes basic data and interpolation data. In the video distribution server 1, only the basic data is transmitted and distributed in advance to the user terminals 6a, 6b, 6c and 6d through the network. The user terminals 6a, 6b, 6c, and 6d acquire interpolation data corresponding to selected basic data of video data from the video distribution server 1 on transmission request. The basic data of the video data is synthesized with the corresponding interpolation data and the selected video data is reproduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a video transmission system for transmitting video information via a network, and more particularly to a video distribution system using AVOD that provides video and audio services in response to a user request.

  Advances in information processing technology used in personal information terminals such as computers and mobile phones, as well as transmission, communication, and broadcasting technologies such as video distribution represented by the Internet, wireless / wired network systems, digital broadcasting, AVOD, etc. As a result, video transmission / distribution technology centered on moving images has become available. In addition, with the development of wireless LAN technology, it has become possible to configure a video distribution system using a wireless LAN. However, wireless LAN is susceptible to the influence of the surrounding environment, and there is a problem that video cannot be distributed stably at all times. In the conventional wired LAN, the same problem occurs depending on traffic congestion.

  For this purpose, an image transmitting apparatus having a calculating means for calculating the data transmission speed in the network, and having a reducing means for reducing the data amount of image data to be transmitted based on the data transmission speed calculated by the calculating means, and its A control method has been proposed (see, for example, Patent Document 1).

  Also, for example, when downloading video content via a communication medium such as the Internet, moving image data is encoded at a plurality of different resolution levels, and the lowest resolution for each encoded data at each resolution level. In order from the encoded data of the level, transmission is performed in time series while taking a difference between the encoded data of the adjacent resolution levels. The user can easily view the entire video content by recording and playing back the encoded data of the lowest resolution level sent first, and can quickly determine whether the video content is useful. A recording / reproducing method has been proposed (see, for example, Patent Document 2).

Also, video content composed of multiple still image frames is divided into main key frames and intermediate frames existing between the key frames, and an image input unit for acquiring the key frames and interpolation calculation between adjacent key frames The intermediate image generating unit for generating the intermediate frame image and the intermediate frame are inserted between the key frames and continuously displayed to display the moving image. Then, when the intermediate frame is displayed for a predetermined time or more, instead of the interpolated image displayed as the intermediate frame, a detailed image having a higher level of detail than the interpolated image is displayed, thereby reducing the amount of data. There has been proposed an image distribution method for improving the moving image quality by the amount (see, for example, Patent Document 3).
JP 2001-36655 A Japanese Patent Laid-Open No. 11-177929 JP 2004-32219 A

  In the conventional proposal example described above, in the image transmission apparatus and its control method for calculating the transmission amount in the network and reducing the number of images to be transmitted based on the calculated data rate, the data transmission time is the network traffic. However, the purpose is to shorten the transmission time of image data having a large amount of data regardless of traffic.

  In addition, the moving image data is encoded at a plurality of different resolution levels, and for each encoded data of each resolution level, the difference between the encoded data of adjacent resolution levels in order from the encoded data of the lowest resolution level. In a method for recording and reproducing moving image data that is processed in time series while taking the desired image data, the desired moving image data is placed in an arbitrary range from the beginning to the end in a shorter time with a smaller amount of communication data in the communication medium. It is an object of the present invention to provide a technique for processing moving image data that can be reproduced in the future.

  Furthermore, in order to display a detailed image having a higher level of detail than an interpolated image generated by interpolation calculation between adjacent key frames for a distribution unit that distributes key frames and an intermediate frame that is inserted and displayed between key frames In the configuration of the image distribution system that includes a reception unit that receives a display information distribution request, a generation unit that generates display information, and a transmission unit that distributes display information, the image quality can be reduced while distributing a moving image with a small amount of data. An object of the present invention is to provide an image distribution technique for reducing deterioration.

  However, in any of the proposed information data distribution and transmission techniques, there is a problem that the quality is extremely deteriorated, such as video content being stopped or video frames being dropped, if the network conditions to be used are deteriorated. It was left unsolved.

  The present invention has been made to solve the above-described problems. Regardless of the type of network, such as wired or wireless, and regardless of changes in the communication status such as the degree of congestion in the network status, the video data An object of the present invention is to provide a video distribution system capable of transmission distribution while ensuring quality.

  In order to achieve the above object, a video distribution system of the present invention is a video distribution system comprising a network, a plurality of terminal devices connected to the network, and a video distribution server. The video distribution server stores basic data of distribution video. The data is transmitted to the terminal device via the network in advance, the terminal device stores the received basic data in a storage memory, and the distribution server transmits interpolation data for interpolating the basic data to the terminal device based on a request from the terminal device. The terminal device is characterized in that when the interpolation data can be received, the video is reproduced by combining with the basic data, and when the interpolation data cannot be received, the video is reproduced only with the basic data. As a result, even if there is a change in the network status, the minimum quality of video data can be ensured. If the network status is good, even better quality video can be played back, and there are multiple terminals with different resolutions. Even in some cases, for example, it is possible to provide a video distribution service by classifying terminals having a minimum quality and terminals having high resolution and high quality. In addition, since it is not necessary to store all video data required for playback in the storage area in the terminal device provided in the video distribution system, the capacity of the storage area can be reduced and the price of the video distribution system can be suppressed. It becomes possible.

  In the video distribution system of the present invention, the terminal device includes a plurality of receiving terminals connected to the network and a plurality of video terminals connected to the receiving terminal. The receiving terminal synthesizes the received basic data and interpolation data. The video may be provided to the video terminal. Thus, it is not necessary to install a reception function or a function for combining basic data and interpolation data in individual video terminals, and the video terminal only needs to have a display function.

  In the video distribution system of the present invention, priorities may be assigned in advance to a plurality of receiving terminals, and the receiving terminals may receive interpolation data from the video distribution server with priority based on the priorities. As a result, for example, in-flight video distribution services represented by aircraft IFE, etc., effectively use the transmission bandwidth by changing the image quality provided according to the rank of the passenger seat such as first class, business class and economy class. Can do.

  In the video distribution system of the present invention, the terminal device or the receiving terminal stores the received interpolation data in a storage memory, and when requesting transmission of the interpolation data to the video distribution server, the storage device is searched for the interpolation data. If is stored, the video may be reproduced using the stored interpolation data. As a result, the transmission conditions of the network are deteriorated, and even if the interpolation data cannot be received, the high-quality video can be reproduced using the previously received interpolation data.

  In the video distribution system of the present invention, the basic data may include audio data to be distributed. As a result, even when the network condition in which interpolation data cannot be received is bad, the voice data is stored in the terminal device, so that high quality voice can always be reproduced.

  In the video distribution system of the present invention, the basic data is preferably distributed by multicast communication. Thereby, basic data can be distributed to all terminal devices in a short time.

  As described above, according to the present invention, in the video distribution system, it is possible to ensure the quality of video data regardless of changes in the type of network and the communication status.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
First, the configuration of the video transmission system in the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view schematically showing a configuration of a video transmission system according to an embodiment of the present invention. In the configuration of the video transmission system shown in FIG. 1, one video distribution server 1 includes four user terminals 6a, user terminals 6b, user terminals 6c, and user terminals 6d (terminal terminals in the following description). In this example, a user terminal 6 may be representatively described without distinguishing each device), and the wireless network 4 and the wired network 5 are connected. The wired network uses a distributor 2 and is connected to each user terminal 6.

  The video distribution server 1 provided in the video transmission system according to the embodiment of the present invention first uses, for example, multicast transmission in the wireless network 4 for minimum video data that can be reproduced without interruption when the system is started up. Send. Each user terminal 6 stores the data information in each user terminal 6. When the content to be reproduced is selected, the data in the user terminal 6 is reproduced, and the video distribution server 1 is requested to transmit interpolation data. The user terminal 6 uses the interpolated data when the interpolated data can be received, and performs reproduction without using the interpolated data when the interpolated data cannot be received due to the network status.

  Next, the configuration of the video distribution server 1 provided in the video transmission system according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing an outline of the configuration of the video distribution server provided in the video transmission system according to the embodiment of the present invention. In FIG. 2, a video distribution server 1 includes a CPU 11 that controls the video distribution server 1, a main memory 12 that records data necessary for operating the CPU 11, a wireless LAN module 13 that is a communication module connected to the wireless network 4, a wired A wired LAN module 14 that is a communication module connected to the network 5, an HDD (hard disk drive) 16 that stores a plurality of video contents, and an HDD controller (hard disk controller) 15 that controls the HDD are provided.

  Next, the configuration of the user terminal 6 that is a terminal device provided in the video transmission system according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing an outline of the configuration of the user terminal provided in the video transmission system according to the embodiment of the present invention. 3, a user terminal 6 includes a CPU 21 that controls the user terminal, a main memory 22 that records data necessary for operating the CPU 21, a graphic controller 23 that controls a display device 24 such as a liquid crystal display (LCD), and video data. A memory controller 25 for controlling the storage memory 26 for storing video, a decoder 27 for decoding video data, a wireless LAN module 28 as a communication module for connecting to the wireless network 4, and a communication module for connecting to the wired network 5. A wired LAN module 29 is provided. As the storage memory 26, in addition to a semiconductor memory using an HDD or a flash memory, an optical drive memory using MO or DVD as a memory medium can be used.

  Following the description of the configuration of the video distribution system according to the embodiment of the present invention described above, the operation procedure and method of the video distribution system according to the embodiment of the present invention will be described with reference to FIG. 4, FIG. 5, FIG. 8, FIG. 9, FIG. 10, and FIG. FIG. 4 is a flowchart showing a procedure of operations and processing when multicasting video data in the video distribution system according to the embodiment of the present invention. FIG. 5 is a multicast distribution of video data in the video distribution system according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing a state in which multicast transmission of video data is completed in the video distribution system according to the embodiment of the present invention, and FIG. 7 is a diagram showing the operation of the present invention. FIG. 8 is a schematic diagram showing a state in which a user terminal has selected content in the video distribution system in the embodiment, and FIG. 8 shows a communication situation when video data is transmitted from the distribution server to the user terminal in the video distribution system in the embodiment of the present invention. FIG. 9 shows a video distribution system according to the embodiment of the present invention. FIG. 10 is a schematic diagram for explaining a method when inter-frame interpolation is performed on video data transmitted in FIG. 10. FIG. 10 is a diagram when intra-frame interpolation is performed on video data transmitted in the video distribution system according to the embodiment of the present invention. It is a schematic diagram explaining a method. In FIG. 4, the operation procedure of the video distribution server 1 is surrounded by a broken line, the operation procedure in the wireless network 4 or the wired network 5 is surrounded by a one-dot chain line, and the operation procedure in the user terminal 6 that is a terminal device is surrounded by a two-dot chain line. Shown separately. Moreover, although FIG.5, FIG.6, FIG.7, FIG. 8 which shows typically operation | movement of the video delivery system in embodiment of this invention has shown the example with three user terminals 6a, 6b, 6c. There may be more than three.

  In the video distribution server 1 provided in the video distribution system according to the embodiment of the present invention, video data is stored in advance in the built-in HDD 16 separately into basic data and interpolation data. These video data may be transferred to the video distribution server 1 in advance by using a personal computer or the like. Also, the video distribution server 1 is provided with video input and encoding processing functions, so Video data may be created by the distribution server and stored in the HDD 16 in advance. In FIG. 4, when the video distribution system according to the embodiment of the present invention is started up, the processing is started (step S01). First, the distribution server 1 reads basic data stored in advance in the HDD 16 into the main memory 12 (step S02). The distribution server 2 multicasts the read basic data to each user terminal 6 via the wireless network 4 or the wired network 5 using the communication module (step S03). The user terminal 6 receives the basic data of the content 1 to the content 3 that is, for example, the content of the video data transmitted by the communication module, and stores the data in the storage memory 26 in each user terminal 6 (steps). S04). This is the operation until startup. FIG. 5 shows operations at the time of start-up of the video distribution system in the embodiment of the present invention from step S01 to step S04, that is, content 1 to content 3 stored in the HDD 16 of the distribution server 1, for example. Only a basic data among a plurality of basic data and interpolation data is multicast-transmitted to the user terminal 6a, the user terminal 6b, and the user terminal 6c, and stored in the memory of each user terminal. Then, the multicast transmission is completed, and the user terminal 6 records the basic data from the contents 1 to 3 in the storage memory 26 in each terminal, and when the recording is completed, for example, the user terminal 6 is displayed on the display device 24 of the user terminal 6. A menu as shown on the screen 30 is displayed, and the content can be selected. FIG. 6 is a schematic view showing the state at this time. After the above series of start-up processes is completed, the video distribution server 1 shifts to the server standby mode (step S101), and the server receives an interpolation data request command from the user terminal 6 in step S10 to be described later. The process waits until the operation mode is entered (step S101).

  Since the display device 24 provided in the user terminal 6 displays a menu of selectable contents as shown on the screen 30 in FIG. 6, contents to be reproduced by operating a selection key or the like (not shown). Select (step S05). The screen 30 in FIG. 6 shows a state in which the content 2 is selected. When the content is selected, the user terminal 6 reads the basic data of the selected content (content 2 in the example of FIG. 6) recorded in the storage memory 26 into the main memory 22 (step S06), and the decoder is controlled by the CPU 21. 27 decodes the basic data into reproducible video data (step S07). The decoded video data of the selected content is written into the main memory 22 (step S07) and buffered. Subsequently, the user terminal 6 proceeds to a process of reproducing the buffered video data written in the main memory 22, but before that, the user terminal 6 reproduces only the basic data of the selected content or inserts interpolation data into the basic data. In addition, it is determined whether or not to reproduce full content (step S08). Various conditions can be set as conditions for determining whether to use the interpolation data in accordance with the service form of the video distribution system. For example, in-flight video distribution services represented by aircraft IFE, etc., match the ranks of passenger seats such as first class, business class, and economy class, and the types and ranks of charges for Internet video distribution services and cable video distribution services. Alternatively, it may be possible to set in advance whether to select basic content or full content to which interpolation data has been added in accordance with the content of the contract with the user. In addition, it is possible to set so that only the basic data can be listened to in a short time, or the full content can be viewed over time, or the user can select according to the type and content of the content.

  In the case where only basic data is used without using interpolation data in step S08, the user terminal 6 is written in the main memory 22, and video data playback processing of only buffered basic data is performed until the end of the selected content. Repeat (step S19).

  On the other hand, when using the interpolation data in step S08, the user terminal 6 transmits a command for requesting transmission of interpolation data corresponding to the selected content to the video distribution server 1 from the communication module via the network (step S09). ). The video distribution server 1 exits from the server standby mode in step S101, shifts to the server operation mode (step S102), and receives an interpolation data request command from the user terminal 6 by the communication module (step S10). Next, the video distribution server 1 reads the interpolation data of the selected content stored in the storage memory 26 into the main memory 12 (step S11), and sends the interpolation data of the selected content via the network to the terminal that requested the interpolation data. Transmission is performed by the communication module (step S12). Regarding the processing procedure from step S09 to step S12 described above, when the content 2 is selected at the user terminal 6a and the content 3 is selected at the user terminal 6c in FIG. The example which transmits the interpolation data of the content 3 to the user terminal 6c with the interpolation data of the content 2 was shown with the schematic diagram.

  Subsequently, the description will proceed to the interpolation data processing procedure in the user terminal 6. The interpolation data of the selected content transmitted from the video distribution server 1 is received and acquired by the user terminal 6 using the communication module (step S13). In the example shown in FIG. 8, the interpolation data of the content 2 is used for the user terminal 6a and the interpolation data of the content 3 is used for the user terminal 6c. At this time, the user terminal 6 determines whether or not the target interpolation data has been acquired (step S14). Since the target interpolation data may not be acquired by the user terminal 6 depending on the bandwidth of the wireless network 4 and the wired network 5 to which the interpolation data is transmitted and the traffic congestion state, the determination in step S14 is performed. If the interpolation data of the selected content could not be acquired by the user terminal 6, as already described in the processing when reproducing the video data using only the basic data without using the interpolation data in step S08, the user terminal 6 is written in the main memory 22, and the process of reproducing the video data of only the buffered basic data is repeated until the end of the selected content (step S19).

  On the other hand, when the user terminal 6 can acquire the interpolation data of the selected content, the user terminal 6 stores the interpolation data transmitted from the video distribution server 1 via the network in the storage memory 26 in the user terminal 6 ( Step S15). Next, the user terminal 6 reads the interpolation data of the selected content (content 2 for the user terminal 6a and content 3 for the user terminal 6c) stored in the storage memory 26 into the main memory 22, The decoder 27 decodes the interpolation data of the content selected by the control of the CPU 21 into reproducible video data (step S17). The decoded interpolated video data that can be reproduced is synthesized as video data of full content together with video data of only basic data already buffered in the main memory 22 (step S18). Thereafter, the video data reproduction process of the full content synthesized with the basic data and the interpolation data is repeated until the selected content is finished (step S19). When the reproduction of the selected content is finished and another reproduction content is selected, the processing from step S05 to step S19 is repeated. Note that, as described above, depending on the communication status of the network, the user terminal 6 and the video distribution server 1 are not always connected and the desired interpolation data cannot be acquired. Processing for storing the interpolated data in the storage memory 26 built in the user terminal 6, searching whether there is necessary interpolation data on the storage memory 26, and determining whether there is interpolation data in step S14 May be performed. In FIG. 7, the video distribution server 1 transmits the interpolation data of the content 2 to the user terminal 6a and the interpolation data transmission corresponding to the schematic diagram showing the example of transmitting the interpolation data of the content 3 to the user terminal 6c. An example of the processing from step S12 to step S18 reflecting the communication status of the network for use is schematically shown in FIG. In FIG. 8, communication via the network between the video distribution server 1 and the user terminal 6a is connected, while communication via the network between the video distribution server 1 and the user terminal 6c is connected due to some kind of failure. Each shows no situation. In this network connection state, the user terminal 6a reproduces full content using basic data and interpolation data, and the user terminal 6c reproduces only basic data.

  Here, an example of an interpolation method of video data used in the video distribution system in the embodiment of the present invention will be briefly described. First, the inter-frame interpolation of the video data shown in FIG. 9 will be described. In FIG. 9, a frame of video data 40 includes a basic data frame (basic frame) 41 and an interpolation data frame (interpolation frame) 42. For example, when the basic data is 15 fps (Frame Per Second) and the interpolation data is also 15 fps, the video data 40 can be reproduced at a reproduction rate of 30 fps by repeating the basic frame 41 and the interpolation frame 42 one-on-one. . When interpolation data cannot be received, the video data 40 of only the basic frame 41 can be reproduced at a reproduction rate of 15 fps by skipping the interpolation frame 42 (also referred to as thinning out). When the reception situation is unstable, it is considered that there are many changes in the reproduction rate of the video data 40 of 15 fps and 30 fps. In this case, a sudden change can be avoided by buffering the interpolation frame 42 of a short period of several seconds in the storage memory 26 built in the user terminal 6.

  Next, intra-frame interpolation shown in FIG. 10 will be described. In FIG. 10, video data is composed of basic data pixels (basic pixels) 43 indicated by white circles (◯) and interpolation data pixels (interpolation pixels) 44 indicated by black circles (●) within one frame. Suppose that In the example shown in FIG. 10, half of the horizontal pixels shown in the horizontal row are the basic pixels 43. For example, if the basic pixel 43 is 360 pixels and the interpolation pixel 44 is 360 pixels on the horizontal line, it is 360 pixels when the interpolation pixel 44 cannot be received, and 720 pixels when the interpolation pixel 44 is received. Can play. Further, the video data may be interpolated by simultaneously using the intra-frame interpolation using the pixels in the frame and the inter-frame interpolation described above with reference to FIG.

  In addition to this, as a method for interpolating video data, a compression method for converting a frequency such as Discrete Cosine Transform (DCT) can be used. In this case, for example, it is possible to adopt a format in which compressed data created with low frequency components is used as basic data and only high frequency components are used as interpolation data, or basic data of high frequency components and interpolation data of low frequency components are used. Various methods can be used, including

  Similarly, when audio data is reproduced by the user terminal 6 in accordance with video data, it can be divided into basic data and interpolation data according to frequency components. However, since the audio data has a smaller capacity than the video data and is easily recognized by humans when it is interrupted, 6 data is transmitted as multicast data to the user terminal at the start-up as all data, and the storage memory 26 It is desirable to store it in

  In the video distribution system according to the embodiment of the present invention described above, between the video distribution server 1 and each user terminal 6 which is a terminal device, via a wired network 5 using a distributor 2 and a wired LAN module, or Although the configuration example in which the video data is transmitted via the wireless network 4 using the wireless LAN module has been described, the video distribution system according to the embodiment of the present invention is not limited to this configuration, and other configurations are possible. . An example of another video distribution system configuration will be described with reference to FIG. FIG. 11 is a perspective view schematically showing a configuration of another video transmission system according to the embodiment of the present invention. In FIG. 11, the same components as those in the video transmission system shown in FIG. 1 are denoted by the same reference numerals, and detailed descriptions thereof are omitted to avoid duplication.

  In the configuration of another video distribution system in the embodiment of the present invention shown in FIG. 11, video terminals 61a, 61b,... That are not provided with a wireless LAN module but are provided only with a wired LAN module or video / audio signal connection terminals , And video terminals 62a, 62b,..., And each group receives a wireless LAN module, a wired LAN module, and a video / audio signal connection terminal. A terminal 60b is provided. Distribution and transmission of video data is performed for each reception terminal 60a and reception terminal 60b via the wireless network 4 or the wired network 5, and each video terminal 61a, from the reception terminal 60a and the reception terminal 60b for each group. .. And the video terminals 62a, 62b,..., And the video transmission system configured to decode and synthesize video data. This video distribution system includes a receiving terminal as a terminal device and a plurality of video terminals connected to the receiving terminal. Then, the receiving terminal removes the display device 24 and the graphic controller 23 from the user terminal 6 shown in FIG. 3, and the display device 24 and the graphic controller 23 constitute a video terminal, and each has a video / audio signal connection terminal. It can be considered that it was configured. The video data distribution system in the video transmission system having the configuration shown in FIG. 11, the video data decoding and synthesizing process procedures in the video transmission system having the configuration shown in FIGS. This is almost the same as the method procedure described using, and detailed description thereof is omitted to avoid duplication.

  In the video transmission system having the configuration shown in FIG. 11, a method of transmitting interpolation data with priorities assigned to each group can also be used. As already mentioned above, taking the in-flight video distribution service represented by IFE in the aircraft as an example, interpolation data is sent preferentially to the first class and business class, and to the first class and business class to the economy class. Interpolation data can be transmitted only when there is a margin beyond transmission.

  The configuration of the video distribution system in the above-described embodiment of the present invention has been described with an example centered on communication transmitted via the wireless network between the video distribution server 1 and the user terminal 6. The video distribution system in the embodiment of the invention is not limited to this, and both the wired network and the wireless network may be used, the basic data may be transmitted by multicast transmission, and the interpolation data may be transmitted by wireless network. Conversely, it goes without saying that a wireless network may be used for basic data transmission and a wired network may be used for interpolation data transmission.

  As described above, when the video distribution system according to the embodiment of the present invention is started up, first, by multicast transmission, data for ensuring minimum quality is transmitted to the storage areas of a plurality of terminals for storage / storage. save. After that, when a video transmission system such as VOD is implemented, when the video is played back by user operation, it is played back using the data stored in the storage area, and the resolution is sent from the distribution server via the network. Data for interpolating frames and frames is received and used for reproduction. Thereby, even if there is a change in the network status, the minimum quality of video data can be ensured, and if the network status is good, a video with better quality can be reproduced. Further, even when there are a plurality of terminals having different resolutions, for example, it is possible to classify a terminal having a minimum quality and a terminal having a high resolution and improving the quality to perform a video distribution service. Furthermore, since it is no longer necessary to store all video data required for playback in the storage area of the terminal device provided in the video distribution system, the capacity of the storage area can be reduced, and the price of the video distribution system can be increased. It is possible to provide a video distribution system that can be suppressed.

  The video distribution system according to the present invention is useful when applied to a video distribution service for distributing and transmitting a plurality of video data in a passenger plane or the like.

The perspective view which shows schematically the structure of the video transmission system in embodiment of this invention The block diagram which shows the outline of a structure of the video delivery server with which the video transmission system in embodiment of this invention is equipped. The block diagram which shows the outline of a structure of the user terminal with which the video transmission system in embodiment of this invention is equipped. The flowchart which shows the procedure of operation | movement and a process when carrying out multicast delivery of video data in the video delivery system in embodiment of this invention. The schematic diagram which shows the operation | movement at the time of system start-up when multicasting video data in the video delivery system in embodiment of this invention The schematic diagram which shows the state which the multicast transmission of video data was complete | finished in the video delivery system in embodiment of this invention The schematic diagram which shows the state which the user terminal selected the content in the video delivery system in embodiment of this invention. FIG. 3 is a schematic diagram illustrating a communication state when video data is transmitted from a distribution server to a user terminal in the video distribution system according to the embodiment of the present invention. Schematic diagram illustrating a method for performing inter-frame interpolation on video data transmitted in the video distribution system according to the embodiment of the present invention. Schematic diagram illustrating a method for performing intra-frame interpolation on video data transmitted in the video distribution system according to the embodiment of the present invention. The perspective view which shows schematically the structure of another video transmission system in embodiment of this invention.

Explanation of symbols

1 (Video) Distribution Server 2 Distributor 4 Wireless Network 5 Wired Network 6, 6a, 6b, 6c, 6d User Terminal 11, 21 CPU
12, 22 Main memory 13, 28 Wireless LAN module 14, 29 Wired LAN module 15 HDD controller (hard disk controller)
16 HDD (Hard Disk Drive)
23 graphic controller 24 display device 25 memory controller 26 memory 27 decoder 30 screen 40 video data 41 basic frame 42 interpolation frame 43 basic pixel 44 interpolation pixel 60, 60a, 60b receiving terminal 61a, 61b, 62a, 62b video terminal

Claims (6)

In a video distribution system comprising a network, a plurality of terminal devices connected to the network, and a video distribution server,
The video distribution server transmits the basic data of the distribution video to the terminal device via the network in advance,
The terminal device stores the received basic data in a storage memory,
The video distribution server transmits interpolation data for interpolating the basic data to the terminal device based on a request from the terminal device,
When the terminal device can receive the interpolation data, the terminal device combines the basic data to reproduce the video, and when the interpolation data cannot be received, the terminal device reproduces the video using only the basic data. A featured video distribution system. The terminal device includes a plurality of receiving terminals connected to the network;
A plurality of video terminals connected to the receiving terminal;
The video distribution system according to claim 1, wherein the receiving terminal combines the received basic data and the interpolation data and provides the video to the video terminal. 3. The video distribution system according to claim 2, wherein priorities are assigned to the plurality of receiving terminals in advance, and the receiving terminals receive the interpolation data from the video distribution server preferentially based on the priorities. . The terminal device or the receiving terminal stores the received interpolation data in the storage memory, and when requesting the video distribution server to transmit the interpolation data, searches the storage memory, and the interpolation data is The video distribution system according to any one of claims 1 to 3, wherein if stored, the video is reproduced using the stored interpolation data. The video distribution system according to claim 1, wherein the basic data includes audio data to be distributed. The video distribution system according to claim 1, wherein the basic data is distributed by multicast communication.

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