JP2013081020A - Data distribution method and data distribution system - Google Patents

Abstract

Disclosed is a video data distribution system and method for effectively suppressing deterioration in video quality such as video delay and video disturbance on a display device.
Use encoded data of an image frame arranged along a time axis without being compressed in the time axis direction as packet data delivered from a data transmission unit having a QoS function to a receiving terminal. To do. On the transmission side, the queuing process for buffering the encoded packet data and transmitting the packet according to the usable bandwidth is performed until the encoded packet data corresponding to the next image frame is buffered. Then, the decoding process is performed using only the encoded packet data that has been received when the encoded packet data corresponding to the next image frame is received.
[Selection] Figure 5

Description

  The present invention relates to a data distribution method and a data distribution system for packet distribution of digital data having a plurality of types of hierarchical scalability as video data between information processing devices connected to a predetermined transmission means.

  In recent years, in a network that simultaneously operates data traffic and video traffic, with the increase in demand for distribution services such as video data serving as a data source, so-called QoS (Quality of Quality) such as bandwidth control and priority control is used to effectively use communication bandwidth. Service) function has become necessary.

  That is, by using an information processing device such as a communication control device (NCU: Network Control Unit) on a network or a router on a local LAN connected to the network as a bandwidth management device, the QoS function can be achieved on the network. Is provided. Such a bandwidth management apparatus identifies a data packet flowing on the network and controls a bandwidth that can be used for each application to secure a bandwidth for important business such as a backbone system. As a result, it is possible to prevent an available communication band from being occupied by an application with a large amount of traffic, and to suppress a decrease in service level of the entire communication system including a network such as a data distribution system.

  For example, in Patent Document 1, the quality of video displayed on a desired display device is ensured by analyzing the type of traffic before transmission and controlling in advance the amount of bandwidth transmitted by data traffic and video traffic. Technology is disclosed. Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for performing fluctuation control on a distribution band of a packet including a data source (video data) or audio data in real time.

JP 2005-348284 A International Publication WO2006 / 103724 Pamphlet

  As a result of examining the technology for realizing the conventional QoS function, the inventors have found the following problems. That is, with the conventional QoS function, when video data serving as a data source composed of a plurality of image frames is distributed, if a sufficient bandwidth cannot be secured, video delay and video disturbance on the receiving terminal side (on the display device) Will occur. In other words, since the conventional QoS function controls the timing of transmission from the queue according to the data priority, data with a low data priority takes time to complete transmission from the queue, or data is not transmitted. Could be discarded.

  The present invention has been made in order to solve the above-described problems, and in accordance with the usable bandwidth that varies depending on various communication environments, a desired display can be independently performed on each of the transmission side and the reception side. A video data distribution system for effectively controlling deterioration of video quality such as video delay and video disturbance on a display device by controlling the quality of video to be displayed on the device, and The purpose is to provide a delivery method.

  One embodiment of the present invention is a data distribution for performing packet distribution of image frames constituting video data between information processing apparatuses selected as transmission / reception terminals from a plurality of information processing apparatuses connected to a predetermined transmission means. A method and a data distribution system for realizing the data distribution method are provided. Here, the predetermined transmission means is a concept including a local LAN and a home LAN as well as a general communication network such as a public line and a mobile phone line, regardless of wired or wireless, such as the Internet. It means all communication paths located between information processing devices that perform transmission and reception.

  The data distribution method according to an embodiment includes data in which a data transmission unit including at least a recording unit, a control unit, and a communication unit is configured by one or more information processing devices selected from a plurality of information processing devices. It is executed in the distribution system. Therefore, the data distribution system includes a predetermined transmission unit and a plurality of information processing apparatuses connected to the transmission unit. Here, in addition to transmission / reception terminal devices (personal computers, hereinafter referred to as “PCs”), information processing devices include network resources such as routers and Internet installed on local and home LANs (eg, NCU) ) Is also included.

  Specifically, the control means in the data transmission unit performs a first data generation process, an encoding process, a queuing process, and a data sending process. In the first data generation step, video data captured from an input device such as a camera or video frames constituting video data stored in advance in another recording unit is not compressed in the time axis direction. It is arranged along. In the encoding step, scalable compression of the image frames sequentially prepared in the first data generation step is performed. Thus, encoding of each image frame having scalability is executed. Note that scalable compression means a compression method that performs encoding with hierarchical scalability so that a plurality of resolutions, bit rates, and the like can be extracted from a single piece of compressed data. In the queuing step, a plurality of packet data divided from the scalable compressed encoded data is buffered in the recording means in accordance with a preset data priority (for example, a progression order in the JPEG2000 standard). In parallel with this buffering, packet data to be sent out of the buffered packet data is extracted from the recording means according to the bandwidth allocated for packet distribution between the transmitting terminal and the receiving terminal. It is. The extraction of the packet data to be transmitted is executed until the encoded packet data corresponding to the next image frame is buffered while the buffer in the queuing process is full. In the data sending step, the packet data taken out from the recording means is sent out sequentially to the predetermined transmission means via the communication means.

  As described above, in the data distribution method, the buffered packet data is extracted (part of the distribution operation) when the buffer in the queuing process is full and the encoded packet data corresponding to the next image frame is stored. It is executed until the buffering timing. Here, after this timing (after the timing when the encoded packet data corresponding to the next image frame is buffered) according to the smoothness of the video displayed on the receiving side (image frame speed) or the priority of the image quality of the video ), A transition process is performed to enable buffering and extraction of encoded packet data corresponding to the next image frame. As an example of this transition processing, the control means stops the extraction of the encoded packet data corresponding to the current image frame (part of the distribution operation) and then the queuing process and data for the encoded packet data corresponding to the next image frame In the queuing step of the encoded packet data corresponding to the next image frame, the data is discarded without executing the buffering of the encoded packet data corresponding to the next image frame, and the priority data is The extraction of the encoded packet data corresponding to the current image frame is continued until the transmission is completed. Note that the priority data delimiter is determined by the required high image quality on the receiving side because the image quality is better in the rear of the data string. In the queuing process, the number of image frames to be buffered is determined by the video display delay time allowed on the receiving side.

  Since the packet data to be distributed is encoded data of an image frame having hierarchical scalability, the receiving side terminal receives encoded packet data corresponding to the next image frame on the time axis (for example, The data for decoding can be reproduced and displayed by expanding (decoding) the decoding data arranged along the time axis using only the packet data received up to (). As described above, according to the data distribution method, the encoded packet data buffered according to the predetermined data priority is transmitted as much as possible according to the usable communication band that changes in real time (the queuing process and the data transmission process). ). This means that the quality of the video to be displayed on the desired display device can be controlled independently on each of the transmission side and the reception side. As a result, it is possible to effectively suppress degradation of video quality such as video delay and video disturbance on the display device, and with conventional bandwidth control and priority with a certain level of video quality on display secured. The same effect as control can be obtained.

  The data transmission unit may be configured by an information processing apparatus selected as a transmission side terminal from a plurality of information processing apparatuses. In this case, the information processing device constituting the data transmission unit preferably includes at least a recording device that functions as a recording unit, a control device that functions as a control unit, and a communication interface that functions as a communication unit. The control means executes a first data generation process, an encoding process, a queuing process, and a data sending process.

  Further, the data transmission unit may be composed of a plurality of information processing devices connected to a predetermined transmission means. Specifically, the data transmission unit is selected as a first information processing device selected as a transmission-side terminal from a plurality of information processing devices, a band control terminal selected from a plurality of information processing devices, and a predetermined transmission means You may comprise by the 2nd information processing apparatus connected to the 1st information processing apparatus via a part. In this case, the first information processing device is divided at least from the first recording device functioning as a part of the recording unit and the first data generation step, the encoding step, and the scalable compressed data as a part of the control unit. A first control device that executes a data transfer step of transferring a plurality of packet data to the second information processing device, a first communication interface that sends the divided packet data to the outside of the first information processing device, It is preferable to provide. The second information processing apparatus includes at least a second recording apparatus that sequentially stores packet data transferred from the first information processing apparatus as a part of the recording means, and a queuing process and data as a part of the control means. It is preferable to include a second control device that executes the sending process and a second communication interface that functions as a communication unit.

  On the other hand, the information processing terminal selected as the receiving-side terminal from the plurality of information processing apparatuses includes at least a third communication interface, a third recording device, and a third control device. In this case, the third control device uses the queuing process to transmit the decoding target data to be decoded as one image frame using only the packet data that has been successfully received out of the packet data transmitted to the predetermined transmission means. A second data generation step arranged along the time axis, and a step of sequentially decompressing the data to be decoded prepared by the second data generation step, which corresponds to the next image frame on the time axis When encoded packet data is received, it is generated by the second data generation step using only encoded packet data that has been successfully received, regardless of whether or not reception of encoded packet data corresponding to the current image frame is completed. A decrypting step of decompressing the data to be decrypted.

  In the data distribution method and data distribution system, it is preferable that the video data to be encoded is composed of image frames in accordance with the JPEG2000 standard.

  Each embodiment according to the present invention can be more fully understood from the following detailed description and the accompanying drawings. These examples are given for illustration only and should not be construed as limiting the invention.

  Further scope of applicability of the present invention will become apparent from the detailed description given below. However, the detailed description and specific examples, while indicating the preferred embodiment of the invention, are presented for purposes of illustration only and various modifications and improvements within the scope of the invention may It will be apparent to those skilled in the art from the detailed description.

  According to the present invention, it is possible to control the bandwidth without causing video delay or video disturbance on a display device in video distribution (multimedia distribution service including video data) that requires real-time performance such as visual communication. become. In addition, the QoS function can be constructed (implemented) independently of the transmission function, and can follow the band fluctuation in real time independently of the transmission function, so that the data distribution system can be easily constructed. Become.

It is a figure which shows an example of the data delivery system which concerns on this embodiment. It is a block diagram which shows the general structure of information processing apparatus. It is a conceptual diagram for demonstrating the data structure of the digital data (image frame) which has multiple types of hierarchical scalability. It is a conceptual diagram for demonstrating progressive order (data priority). It is a figure for demonstrating the 1st structural example of the data delivery method which concerns on this embodiment based on each function. It is a figure for demonstrating the 2nd structural example of the data delivery method which concerns on this embodiment based on each function.

  Hereinafter, various embodiments of a data distribution method and a data distribution system according to the present invention will be described in detail with reference to FIGS. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram illustrating an example of a data distribution system as a system configuration capable of executing the data distribution method according to the present embodiment. As shown in FIG. 1, the data distribution system according to the present embodiment includes a network 10 and various information processing apparatuses connected directly or indirectly to the network 10. The information processing apparatus or the like directly connected to the network 10 includes, for example, an NCU 30 that is a network resource, and a database (D / B) 20 or the like may be provided on the network 10.

  Further, a router 40 on the data transmission side is connected to the network 10, and a plurality of PCs 42 </ b> A to 42 </ b> D are connected to the router 40 as transmission side terminals via a LAN 41. On the other hand, a router 50 on the data receiving side is also connected to the network 10, and a plurality of PCs 52 </ b> A to 52 </ b> D are connected to the router 50 as receiving side terminals via the LAN 51.

  FIG. 2 is a block diagram illustrating a general configuration of the information processing apparatus 100. The information processing apparatus 100 illustrated in FIG. 2 includes at least a communication interface 120 (including a communication I / O) that is a communication unit that exchanges data between the control unit 110 that is a control unit and the transmission unit 200. ) And N (≧ 1) recording devices 130A to 130N as recording means, and a device interface 140 (including a drawing device and a data transmission / reception I / O) that exchanges data with the peripheral device 150. . The information processing apparatus 100 includes, in addition to the PCs 42A to 42D and 52A to 52D as transmission / reception terminal apparatuses shown in FIG. 1, routers 40 and 50 installed on the LANs 41 and 52, and a network on the network 10. NCU30 etc. which are resources are also included.

  In addition, the transmission means 200 includes a general communication network (corresponding to the network 10 in FIG. 1) such as the public line and a cellular phone line, such as the Internet, regardless of wired or wireless, as well as a local LAN or a home LAN ( 1 is equivalent to the LANs 41 and 51 in FIG. 1, and means a general communication path located between information processing apparatuses that transmit and receive packet data.

  The peripheral device 150 includes, for example, an external recording device, an input device such as a keyboard and a pointing device, and a display device.

  Next, in the data distribution method and data distribution system according to the present invention, digital data (image frames) having a plurality of types of hierarchical scalability are set as encoding and decoding targets (part of distribution targets). Hereinafter, for the sake of simplicity, encoding of each packet of JPEG 2000, which is an international standard for image compression, will be described as a specific example of digital data having hierarchical scalability. JPEG2000 can give priority to the type of scalability. In the coded sequence, this order is expressed as a packet composition order (progression order) which is a data unit. There are four types of scalability that determine the progression order: layer (L), resolution level (R), component (C), and position (P).

FIG. 3 is a conceptual diagram for explaining the data structure of digital data having a plurality of types of hierarchical scalability. The scalability that is an access control target among the scalability of JPEG2000 is represented by a layer (L) and a resolution level (R). ) Shows a decoding pattern of a packet coded sequence in JPEG2000 when it is limited to only (in the case of a grayscale image). Specifically, in FIG. 3, the layer number N _L of the layer (scalability L) is 3, and the layer number N _R of the resolution level (scalability R) is 3. The layer is also referred to as an image quality layer, and means arithmetically encoded data of a digital image corresponding to SNR (Signal / Noise Ratio) at the time of image reproduction. Since information having a higher influence on image quality is included in a higher layer, the quality of a reproduced image can be improved step by step by adding lower layer data to upper layer data.

In FIG. 3, P _{i, j} (i = 0,..., N _L-1 ; j = 0,..., N _R-1 ; i is the hierarchical number of scalability L; j is the hierarchical number of scalability) Represents a JPEG2000 packet with information. Expressing JPEG2000 coded image of a quality _{Q L,} in _{R, Q L,} the packet in order to obtain _R is surrounded by the frame A in FIG. _{3 P i, j (i =} 0, ..., L; j = 0,..., R) all need to be decrypted. However, if at least one of the packets P _{i, j} is decoded on the receiving side, there is no problem in normal reproduction of the image. Therefore, the packets P _{i, j} are individually encoded (scalable compression) in order to maintain the hierarchy in access control such as a QoS function.

  In JPEG2000 as described above, there are five types of progression order (data priority): LRCP, RLCP, RPCL, PCRL, and CPRL, each prioritized in order from the first element. FIG. 4 is a conceptual diagram for explaining the progressive order indicating the priority when decoding the JPEG2000 packet coded sequence shown in FIG. 4A is a decoding order in the LRCP progression order in which scalability L (layer) is given the highest priority, and FIG. 4B is an RLCP progression order in which scalability R (resolution level) is given the highest priority. Is the decoding order.

  FIG. 5 is a diagram for explaining a first configuration example of the data distribution method according to the present embodiment based on each function. The first configuration example of FIG. 5 is an example in which a data transmission unit that executes a transmission function and a QoS function is configured by two information processing terminals. For example, in the configuration of FIG. 1, one information processing apparatus responsible for the transmission function corresponds to one of the transmission side PCs 42 </ b> A to 42 </ b> D (hereinafter, the PC 42 </ b> A will be described as the transmission side PC), and the information processing apparatus responsible for the QoS function is This corresponds to the transmitting router 40. 2, the transmitting-side PC 42A responsible for the transmission function includes at least the recording devices 130A to 130N functioning as a part of the recording unit and the first data generation step (data generation unit) as a part of the control unit. ), An encoding step (encoding), a control device 110 for executing a data transfer step (packet transmission) for transferring a plurality of packet data divided from the scalable compressed data to the second information processing device, and the divided And a communication interface 120 for sending the packet data to the outside of the transmitting PC 42A (see FIG. 2 for other configurations not mentioned). Similarly, the transmission side router 40 responsible for the QoS function includes at least the recording devices 130A to 130N in which the packet data transferred from the transmission side PC 42A is stored as a part of the recording means, and the queuing as a part of the control means. It includes a control device 110 that executes a process (buffering) and a data transmission process, and a communication interface 120 that functions as a communication means (see FIG. 2 for other configurations not mentioned).

  On the other hand, the information processing apparatus having the reception function corresponds to, for example, the reception-side PC 52A in the configuration of FIG. 2, the receiving side PC 52A responsible for the receiving function includes at least the communication interface 120, the recording devices 130A to 130N, and the control device 110 (for other configurations not mentioned in FIG. 2). 2). In this case, the control device 110 in the reception-side PC 52A decodes the packet data to be decoded as one image frame by using only the packet data successfully received from the packet data sent to the predetermined transmission means through the queuing process. A data generation step for arranging the target data along the time axis (packet reception: the recording devices 130A to 130N of the receiving side PC 52A are used in this data generation step), and the prepared decoding target data sequentially It is a process of decompression, and when encoded packet data corresponding to the next image frame is received on the time axis, it is prepared regardless of whether or not reception of encoded packet data corresponding to the current image frame is completed. A decryption step (decoded code) for decompressing the data to be decrypted. The decoded data (image frame) obtained through these steps is sequentially displayed on the display device as the peripheral device 150 as the distributed video data (display step).

  More specifically, the transmission function generates or prepares an image frame to be transmitted (part of video data displayed on a predetermined display device) (using video data stored in a predetermined recording unit in advance) Data generation (data generation process), encoding for compressing the generated data (encoding process), and packet transmission for dividing the encoded data into packets and sending them to the outside (data transfer process) Consists of

  The QoS function is a function for receiving and receiving encoded packet data sent from the transmission function, and storing the received packet data in accordance with the data priority of the destination, data type, progressive order of the JPEG2000 standard, etc. Buffering (queuing process) for extracting the encoded packet data according to the priority (bandwidth) assigned to the packet distribution between them, and packet transmission (data transmission process) for transmitting the extracted encoded packet data to the network 10 Consists of

  The reception function includes packet reception for receiving encoded packet data from the network 10 (part of a data generation step for generating data to be decoded), and a decoding target generated using only the received encoded packet data. It comprises a decoding process (decoding process) for decompressing data and a display process for displaying the decoded data.

  Here, in the transmission function, in the encoding (encoding step), encoding is performed with the maximum image quality that can be received by the other party. At that time, the image data is compressed with a plurality of image quality and resolution in a scalable manner by JPEG2000 or the like (scalable compression). Further, when sending encoded data for transmission packet transmission, or at the time of packet transmission, the encoded packet data is transmitted after preferentially configuring a quality layer (image quality, resolution, etc.) to be prioritized.

  In the QoS function, encoded packet data is transmitted from buffering (queuing process) at a speed corresponding to the assigned priority (bandwidth). At that time, the extraction of the packet data to be transmitted is executed until the encoded packet data corresponding to the next image frame is buffered while the buffer in the queuing process is full. A transition process from the buffering operation of the encoded packet data corresponding to the frame to the buffering operation of the encoded packet data corresponding to the next image frame is performed. As an example, the following two processes are selected according to the preset settings.

  That is, in the transition process, the encoded packet data corresponding to the next image frame is buffered after this timing according to the smoothness of the video displayed on the receiving side (image frame speed) or the priority of the video image quality. And the like), a transition process for enabling buffering and extraction of the encoded packet data corresponding to the next image frame is performed. As an example of this transition processing, there are a queuing step and a data sending step for the encoded packet data corresponding to the next image frame after the extraction (part of the distribution operation) of the encoded packet data corresponding to the current image frame is stopped. In the queuing process of encoded packet data corresponding to the next image frame, the data is discarded without performing buffering of the encoded packet data corresponding to the next image frame, and the priority data is transmitted. The extraction of the encoded packet data corresponding to the current image frame is continued until the end. Note that the priority data delimiter is determined by the required high image quality on the receiving side because the image quality is better in the rear of the data string. In the queuing process, the number of image frames to be buffered is determined by the video display delay time allowed on the receiving side.

  For example, when giving priority to image quality, the encoded packet data corresponding to the next image frame is discarded, and the encoded packet data corresponding to the next image frame is received when the image quality layer of the current image frame data has been transmitted. To do. Alternatively, when priority is given to the image frame rate, transmission of the current image frame data is stopped when the encoded packet data corresponding to the next image frame is received or when transmission of the priority data is completed. The packet transmission is started while buffering the encoded packet data corresponding to the next image frame. Note that the priority data delimiter has better image quality at the rear of the data string, but this changes depending on the transmission request from the receiving side.

  In the reception function, in decoding (decoding process), the image frame data shaped by the QoS function (decoding target data consisting only of the received encoded packet data) is decompressed after being concealed, The decrypted data is displayed on the display unit (display process).

  FIG. 6 is a diagram for explaining a second configuration example of the data distribution method according to the present embodiment based on each function. The second configuration example in FIG. 6 is an example in which the data transmission unit that executes the transmission function to which the QoS function is added is configured by one information processing terminal. For example, in the configuration of FIG. 1, the information processing apparatus having the transmission function to which the QoS function is added corresponds to one of the transmission side PCs 42 </ b> A to 42 </ b> D (hereinafter, the PC 42 </ b> A will be described as the transmission side PC). 2, the transmission-side PC 42A responsible for the transmission function including the QoS function includes at least the recording devices 130A to 130N that function as a part of the recording unit, the control device 110 that functions as a control unit, A communication interface 120 functioning as a communication means (see FIG. 2 for other configurations not mentioned). In this case, the control unit 110 executes a first data generation process (data generation), an encoding process (encoding), a queuing process (buffering), and a data transmission process (packet transmission).

  The information processing apparatus responsible for the reception function corresponds to, for example, the reception-side PC 52A in the configuration of FIG. 2, the receiving side PC 52A responsible for the receiving function includes at least the communication interface 120, the recording devices 130A to 130N, and the control device 110 (for other configurations not mentioned in FIG. 2). 2). In this case, the control device 110 of the receiving PC 52A sequentially generates data to be decoded from only packet data that has been successfully received out of packet data that has been sent to a predetermined transmission means through a queuing process. A process (packet reception: the recording devices 130A to 130N of the receiving PC 52A are used in this data generation process) and a process of sequentially decompressing the generated data to be decoded. When the encoded packet data corresponding to the image frame is received, decoding generated using only the encoded packet data that has been received, regardless of whether or not the encoded packet data corresponding to the current image frame has been received. And a decoding step (decoding) for decompressing the target data. Then, the decoded data (decoded image frames) generated through these steps are sequentially displayed as images on the display device that is the peripheral device 150 (display step).

  From the above description of the present invention, it is apparent that the present invention can be modified in various ways. Such modifications cannot be construed as departing from the spirit and scope of the invention, and modifications obvious to one skilled in the art are intended to be included within the scope of the following claims.

  DESCRIPTION OF SYMBOLS 10 ... Network, 20 ... Database (D / B), 30 ... NCU, 40, 50 ... Router, 41, 51 ... LAN, 42A-42D ... Transmission side terminal (PC), 52A-52D ... Reception side terminal (PC) DESCRIPTION OF SYMBOLS 100 ... Information processing apparatus 110 ... Control apparatus 120 ... Communication interface 130A-130N ... Recording apparatus 140 ... Device interface 150 ... Peripheral device 200 ... Transmission means

Claims (7)

A data distribution method for performing packet distribution for each image frame constituting video data between information processing apparatuses selected as transmission / reception terminals from a plurality of information processing apparatuses connected to a predetermined transmission means,
A data transmission unit including at least a recording unit, a control unit, and a communication unit is configured by one or more information processing devices selected from the plurality of information processing devices,
The control means in the data transmission unit;
A first data generation step of arranging the image frames constituting the video data along the time axis without being compressed in the time axis direction;
An encoding step in which each of the image frames sequentially prepared in the first data generation step is subjected to scalable compression;
Packets between the transmission side terminal and the reception side terminal while buffering a plurality of packet data divided from the scalable compressed encoded data in the recording means in accordance with a preset data priority A queuing step of retrieving packet data to be sent out of the buffered packet data from the recording means according to a bandwidth allocated for distribution;
A data delivery method comprising: a data sending step for sequentially sending packet data extracted from the recording means to the predetermined transmission means via the communication means; In the queuing step, as the packet data extraction operation, after the timing when the encoded packet data corresponding to the next image frame is buffered while the buffer constituted by the recording means is full, The data distribution method according to claim 1, wherein a transition process for shifting from packet data transmission to packet data transmission of a next image frame is performed. The data transmission unit is configured by an information processing device selected as a transmission side terminal from the plurality of information processing devices,
The information processing apparatus includes at least a recording device that functions as the recording unit, and a control device that executes the first data generation step, the encoding step, the queuing step, and the data sending step as the control unit, The data distribution method according to claim 1, further comprising a communication interface functioning as the communication unit. The data transmission unit is selected from the plurality of information processing devices as a transmission-side terminal, selected from the plurality of information processing devices as a bandwidth control terminal, and the predetermined transmission means A second information processing apparatus connected to the first information processing apparatus through a part thereof;
The first information processing device includes at least a first recording device that functions as a part of the recording unit, and the first data generation step, the encoding step, and the scalable compressed data as a part of the control unit. A first control device that executes a data transfer step of transferring a plurality of packet data divided from the first information processing device to the second information processing device, and a first control device that sends the divided packet data to the outside of the first information processing device. A communication interface,
The second information processing device includes at least a second recording device that sequentially stores packet data transferred from the first information processing device as a part of the recording unit, and the queuing as a part of the control unit. The data distribution method according to claim 1, further comprising: a second control device that executes a process and a data transmission process; and a second communication interface that functions as the communication unit. A third information processing apparatus that is selected as a receiving terminal from the plurality of information processing apparatuses and includes at least a third communication interface, a third recording apparatus, and a third control apparatus, wherein the third information processing apparatus The control unit
Of the packet data sent to the predetermined transmission means through the queuing step, the data to be decoded to be decoded as one image frame using only the packet data that has been successfully received along the time axis A second data generation step to be arranged;
A decoding step of sequentially expanding the decoding target data prepared in the second data generation step, and when encoded packet data corresponding to the next image frame is received on the time axis, A decoding step of decompressing the decoding target data generated by the second data generation step using only the encoded packet data that has been successfully received, regardless of whether or not reception of the corresponding encoded packet data has been completed; The data distribution method according to claim 1, wherein the data distribution method is executed. The data distribution method according to any one of claims 1 to 4, wherein the video data to be encoded is composed of image frames according to the JPEG2000 standard. The data delivery system for implement | achieving the data delivery method as described in any one of Claims 1-6.

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