WO2003085907A1 - Reseau de transmission d'images - Google Patents

Reseau de transmission d'images Download PDF

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Publication number
WO2003085907A1
WO2003085907A1 PCT/JP2002/003427 JP0203427W WO03085907A1 WO 2003085907 A1 WO2003085907 A1 WO 2003085907A1 JP 0203427 W JP0203427 W JP 0203427W WO 03085907 A1 WO03085907 A1 WO 03085907A1
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WO
WIPO (PCT)
Prior art keywords
image
frame
value
unit
packet
Prior art date
Application number
PCT/JP2002/003427
Other languages
English (en)
Japanese (ja)
Inventor
Fumio Ishikawa
Seiji Takahashi
Hiroyuki Shinohara
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to JP2003582970A priority Critical patent/JP3914204B2/ja
Priority to PCT/JP2002/003427 priority patent/WO2003085907A1/fr
Publication of WO2003085907A1 publication Critical patent/WO2003085907A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/70—Media network packetisation

Definitions

  • the present invention relates to an image transmission network that performs band control in hierarchical image coding.
  • each image frame is composed of an independently coded intra-coded image (I-frame) and a predictive coded image (P-frame) which is an inter-frame forward prediction coding.
  • I-frame intra-coded image
  • P-frame predictive coded image
  • B-frame Bidirectionally Predictive coded image
  • the coded image data included in a certain period in which an I frame is created is called B0P (Block Of Picture).
  • the I frame, B frame, B frame, P frame Frames are created in the order of frame, B-frame, B-frame, and P-frame, and transmitted to the network.
  • MPEG1 a band of 100 K to 1.5 Mbps is required
  • MPEG2 a band of 1.5 M to 6 Mbps is required
  • MPEG4 a band of 100 Kbps is required.
  • a broadband image such as 6 Mbps is played on an intranet constructed with a high-speed network, and the broadband image is distributed to homes and the like via the internet.
  • an in-home network such as a home is usually a low-speed network such as 56 kbps, and cannot transmit a broadband image such as 6 Mbps. Therefore, at the point where the intranet and the internet are connected, transcoding wideband image data into lowband image data has been performed.
  • One way to convert a wideband image to a low-bandwidth image in order to perform image compression is to use the scalability function of the international standard MPEG.
  • An image coding conversion unit is provided at the point where the LAN and the Internet are connected, and the conversion unit thins out P frames and B frames to convert wideband image data into low-band image data. It was possible to convert to data.
  • the conventional image transmission network has the following problems. To transcode a wideband image into a lowband image, a separate image encoding and conversion unit is required. Also, as the size of the intranet increases, the number of connection points between the intranet and the internet increases, and the number of image coding conversion units increases. Furthermore, when the number of encoded image data increases, the buffer size and the like increase, and the circuit size of the image encoding conversion unit increases. As a result, the cost is high. In addition, the receiving side network also has various line speeds such as modem line, ISDN line, XDSL, etc.In order to perform image coding of the band corresponding to them, encoding conversion is performed to image data of various bands However, there is a problem that encoding conversion becomes complicated.
  • An object of the present invention is to provide an image transmission network that reduces the cost of conversion from a wideband image to a lowband image. Disclosure of the invention
  • an image transmitting unit that packetizes and transmits image encoded frames in which each image frame is encoded according to a corresponding type of encoding method, a plurality of routers, a server, and an image receiving unit And an image transmission network including: a unit for setting, in each of the packet headers, a value corresponding to the type of the image coded frame contained in the packet.
  • a header creating unit and a filtering unit provided in the server that performs a filtering process of discarding or passing a packet based on the value set in the packet header.
  • an image transmitting unit that packetizes and transmits an image-encoded frame in which each image frame is encoded according to a corresponding type of an encoding method, a plurality of routers, An image transmission network including a server and an image reception unit, wherein the image transmission unit sets a multicast address in each packet header according to the type of the image coding frame contained in the packet.
  • Types provided in A separate header creation unit, a multicast participation request unit provided in the image reception unit for making a request to join a multicast group to the server, and a request for participation from the image reception unit.
  • a multicast participation permitting unit provided in the server for permitting participation in a multicast group based on a band in which a receiving unit is accommodated; an image receiving unit permitted to participate in the multicast group; A multicast notifying unit provided in the server for notifying each router of the multicast group to which the receiving unit is permitted to participate, and an image receiving unit permitted to participate when receiving a notification from the multicast notifying unit. Register the multicast address of the multicast group that has been authorized and participated in the routing table.
  • a multicast group registration unit provided in the router, and a router provided in the router for performing a routing process of a packet having a multicast address set in a packet header based on the routing table.
  • An image transmission network characterized by comprising the obtained multicasting processing unit.
  • FIG 1 is the principle diagram of the present invention
  • FIG. 2 is a configuration diagram of an image transmission network according to the first embodiment of the present invention
  • FIG. 3 is a configuration diagram of an image transmission unit in FIG. 2;
  • Figure 4 is the configuration diagram of the proxy server in Figure 2;
  • FIG. 5 is a configuration diagram of an image transmission network according to a second embodiment of the present invention
  • FIG. 6 is a configuration diagram of an image transmission unit in FIG. 5;
  • Figure 7 is a flowchart of the multicast group participation permission
  • FIG. 8 is a sequence chart showing transmission of image data
  • FIG. 9 is a configuration diagram of an image transmission network according to a third embodiment of the present invention.
  • FIG. 10 is a configuration diagram of an image transmission unit in FIG. 9;
  • FIG. 11 is an explanatory diagram of the operation of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • the image transmission unit 2 packetizes and transmits an image coded frame in which each image frame is coded according to the corresponding type of the coding method.
  • the image transmitting unit 2 has a header creating unit 10 for each type.
  • the type-specific header creation unit 10 sets a value in each packet header according to the type of the image coding frame contained in the packet. Then, the image transmitting unit 2 transmits the packet with the header added to the packet in which the value corresponding to the type is set, to the image receiving unit 8.
  • the server 12 has a filtering unit 12.
  • the filtering unit 12 performs packet discarding or passing filtering processing based on the value set in the packet header. For example, when the network in which the image receiving unit 8 is accommodated is a low-bandwidth network, a predetermined type of packet header is set as a discard target packet and a predetermined value is set. By discarding the packet in which the value is set and passing only the packet of the desired value, the image data can be converted to a lower band.
  • the network 7, for example, a router accommodated in the Internet routes the packet filtered by the server 6 and transmits the packet to the image receiving unit 8.
  • the image receiving unit 8 receives the packet that has been filtered by the server 6. As described above, a value corresponding to the type is set in the bucket header, and it is possible to convert to a low band by a simple process of passing only a bucket having a desired value.
  • FIG. 2 is a configuration diagram of the image transmission network according to the first embodiment of the present invention. As shown in Figure 2, the image transmission network consists of the intranet 30 and the internet.
  • Intranet 30 is composed of a broadband network.
  • the image receiving unit 52 #i is accommodated by a low-bandwidth network.
  • FIG. 3 is a configuration diagram of the image transmission unit 40 # i in FIG.
  • the image transmission unit 40 #i sets the information to be filtered in the IP packet header according to the type of the encoded image (I frame, P frame, B frame), and sets the It has the function of sending to As shown in FIG. 3, the image transmitting unit 40 #i has an image encoding unit 60 #i, an IP packetizing unit for each frame type 62 #i, and an IP packet transmitting unit 64 #i .
  • the image encoding unit 60 #i encodes each input image data frame into the corresponding type of MPEG data in an I frame, a P frame, and a B frame.
  • the frame type-specific IP packetizing section 6 2 #i has the following functions. (1) Convert each image frame of I frame, P frame and B frame into IP packet. (2) Create an IP packet header that sets filtering information according to the type of IP packet of the encoded image. For example, when only I frames are passed and P frames and B frames are discarded, the filtering information is set to a specific set value for I frames, and P frames and B frames are Set a value other than the specific set value.
  • the field of the filtering information is not particularly limited, but it is conceivable to use a TOS field or an optional field. In this example, a case where the TOS field is used will be described as an example.
  • the T0S value of the header is a value corresponding to the I-frame, P-frame, and B-frame of the IP-packaged image frame.
  • the T ⁇ S value indicates that when an image packet is relayed to the Internet including a low-bandwidth network, only packets with a specific set value are passed, and packets with other set values are discarded. , Which is used to filter the packets. This facilitates filtering at the network layer level. Note that the proxy server 46 described later performs packet filtering based on the ⁇ 0 S value.
  • the packet transmission unit 6 4 #i transmits the IP packet that has been packetized for each frame type by the IP packetization unit 6 2 #i for each frame type in the intranet 30. Send to a broadband network.
  • the router 42 #i receives the IP packet, performs routing in accordance with the IP address of the IP packet, and transmits the packet to the corresponding transmission path.
  • the image receiving unit 44 #i performs encoding according to whether the IP packetized frame is an I frame, a P frame or a B frame. The image is decoded and displayed on a display or the like.
  • the image receiving unit 4 4 #i in the intranet 30 which is a broadband network is connected.
  • the image receiving section 44 # i can receive all of the I, B, and P frames.
  • FIG. 4 is a configuration diagram of the proxy server 46 in FIG.
  • the proxy server 46 is a server located at the connection point between the intranet 30 and the intranet 32 housed in the intranet 32. In addition to the role of restricting access to the intranet 30 from the Internet 32, it has a role of performing a filtering process.
  • the proxy server 46 includes an IP packet receiving unit 70, a filtering unit 72, and an IP packet transmitting unit 74.
  • the IP packet receiving unit 70 receives the IP packet from the intranet 30.
  • the filtering unit 72 has the following functions. (1) Extract the IP packet header. 2) Check the TOS value of the IP packet header.
  • the IP packet is output to the IP packet transmission unit 74. ⁇ ⁇ If the T0S value of the IP packet is not the above specific value, the IP packet is discarded. The same applies to a case where filtering information other than the T0S field is set in, for example, an option field.
  • the IP packet transmitting section 74 transmits the IP packet passed through the filtering section 72 to the Internet 32.
  • the IP packet transmitting section 74 transmits the IP packet passed through the filtering section 72 to the Internet 32.
  • the filtering of the IP packet is performed by the router or layer 3 accommodated in the Internet 32 other than the connection point between the Intranet 30 and the Internet 32. This may be done when routing to a low-bandwidth network using a switch or the like. However, in this case, it is necessary to provide a router or layer 3 switch with a function to perform filtering at each entrance to the low-bandwidth network.
  • the network 50 #i provided on the Internet 32 receives the IP packet, performs routing according to the IP address of the IP packet, and transmits the packet to the corresponding transmission path.
  • the image receiving unit 52 #i decodes the I frame according to the type of the received IP packetized frame, for example, when receiving the I frame, When an I or P frame is received, the I or P frame is decoded and displayed on the display.
  • the image frame transmission unit 40 # 1 can send a request from the image reception unit 44 # 1 or send a periodic request.
  • each image frame to be distributed is encoded into a corresponding type of frame of I frame / P frame / B frame, and the encoded image data is converted into IP packets.
  • IP packet The TOS value corresponding to the type of the I-frame, P-frame, and B-frame of the frame image that was rendered, and the IP address of the destination image receiving unit 44 # 1 in the packet header. Set and send the IP packet to the intranet 30. (The IP packet addressed to the image receiving unit 44 # 1 is sent via the router # 4 and # 2 #d.
  • the image is received by the image receiving unit 44 # 1.
  • Image frame transmission unit 40 # 1 is a transmission request or distribution contract from image reception unit 44 # 1
  • the image data to be distributed is encoded into I frames / P frames / B frames, and the encoded image data is converted into IP packets.
  • the T0S value and the TOS value corresponding to the I-frame, P-frame, and B-frame types of the IP packetized frame image Set the IP address, etc. of the destination image receiver 5 2 # 4 in the packet header, and
  • the IP packet addressed to the image receiving unit 5 2 # 1 passes through the proxy server 4 via the router 4 2 # a and the router 4 2 # d.
  • the proxy server 46 Upon receiving the IP packet, the proxy server 46 extracts the T0S value of the IP packet header. If the T0S value is a specific set value, the IP packet is transmitted to the Internet 32. If the TOS value is not a specific set value, the corresponding IP packet is discarded. As a result, a specific set value is set for the I frame and a set value other than the specific set value is set for the P / B frame.
  • the IP packets sent from the proxy server 46 to the Internet 32 are routed by the router 50 #g, 50 #h, etc., and sent to the LAN or public network.
  • the image is received by an image receiving unit 52 # 4 provided in a PC or the like accommodated in the low-bandwidth network.
  • the image receiving section 52 # 4 decodes the type of the IP frame, for example, the I frame, and displays it on the display. According to the embodiment described above, image data can be converted to low-bandwidth data only by using a network-layer-level IP protocol without providing a special circuit, and cost can be reduced. it can.
  • FIG. 5 is a configuration diagram of an image transmission network according to the second embodiment of the present invention.
  • the image transmission network includes an intranet 80 and an internet 82.
  • Intranet 80 is composed of a broadband network.
  • the multicast function of the IP protocol is used.
  • the image transmitting unit 90 # i transmits the IP packet of the encoded image frame to the multicast groups 1 and 2. For example, all IP packets of I-frame, B-frame, and P-frame are transmitted to multicast group 1, and IP packets of only I-frame are transmitted to multicast group 2. .
  • the number of multicast groups is not limited to two, and it is possible to provide three or more according to the bandwidth to be accommodated, and the type of image to be transmitted to each multicast group shall also correspond to the bandwidth. Is possible.
  • FIG. 6 is a configuration diagram of the image transmission unit 90 # i in FIG. 5, and substantially the same components as those in FIG. 3 are denoted by the same reference numerals.
  • the image transmission unit 9.0 # i is composed of the image encoding unit 60 # i, the multicast frame type, the IPA packetization unit 1110 # i for each type, and the IP packet. It has a transmitting unit 6 4 #i.
  • the multicast packet type-specific IP packetizing section 110 #i has the following functions. 1 Each image frame of I frame, P frame and B frame is converted into an IP packet. (2) Create the following IP packet header.
  • the router 9 2 #i has the following functions. (1) According to the routing information set in the routing table, routing of IP packets with a tuncast address is performed.
  • the routing table is a table that holds information on the IP address and the corresponding outgoing route.
  • 2 Multicast management server 95 Multicast address notified in accordance with the multicast protocol and the image receiving unit permitted to participate in the multicast group of the multicast address.
  • the IP packet is routed to an outgoing route which is a route to all image receiving units belonging to the multicast group corresponding to the multicast address. Send.
  • the image receiving section 94 # i has the following functions. (1) Receives an I.P packet in which the permitted multi-group address is set. ⁇ Decodes the encoded packet according to the image type of the IP packet,-I frame, B frame, and P frame, and displays it on the display.
  • the multicast management server 95 has the following functions.
  • the image receiving unit 94 of the transmission source # i, 10 2 # When the image receiving unit that has requested to join from the IP address of #i is accommodated in the intranet 80, it is allowed to join the multicast group 1 and the When housed in one net 82, it is allowed to participate in Multi-Key, Stop 2 (2)
  • the IP address of the image receiving unit that is permitted to participate and the multicast address of the permitted multicast group are notified to the routers 92 #i and 100 #i in accordance with the multicast protocol.
  • the multicast address of the multicast group 1 is 22.4.2.2.2
  • the multicast address of the multicast group 2 is 24.3.3.3.
  • the proxy server 96 controls access from the Internet 82 to the intranet 80. ⁇ 1 has the same function as ⁇ .
  • the image receiving unit 102 #i has the same function as the image receiving unit 94 #i.
  • FIG. 7 is a chart showing the participation of the multicast group.
  • the image receiving units 94 # i and 102 # i participate in the multicast group
  • step S 2 the image receiving unit that the user wants to participate sends to the multicast server 95 according to the multicast protocol. And sends a multicast group join request packet.
  • step S4 the multicast management server 95
  • an IP address (not shown) and an image reception unit of the IP address are transmitted from the source IP address of the packet.
  • a table that stores information indicating which one of the networks 82 is accommodated is searched to determine whether or not the terminal is accommodated in the own intranet 80. If the terminal is accommodated in the intranet 80, the process proceeds to step S6.
  • step S6 the image receiving unit is permitted to participate in the multicast group 1 of the multicast address 2 2.4.2.22.
  • step S8 the image receiving unit is permitted to participate in the multicast group 2 of multicast address 2 4.3.3.
  • FIG. 8 is a diagram showing a sequence indicating transmission of image data overnight.
  • the image transmission unit 90 # 1 transmits the image frames over the I-frame, B-frame,..., P-frame by the transmission request from the image reception unit or the periodic distribution based on the contract. Frames and I-frames are encoded, and each I-frame is converted into an IP packet. As shown in (1) in Fig. 8, set the multicast address 2 44. 2. 2. 2 of multicast group 1 (MG 1) in the IP packet header of the I-frame and transmit. . For the same I-frame, the multicast address 2 44.3.3, 3 of multicast group 2 (MG 2) is set in the IP packet header, and transmission is performed as shown in (2) in Fig. 8. I do. For the B-frame and P-frame, the multicast address 2 4.4.2.2 of multicast group 1 is set in the IP packet header, and (3), ( Send as shown in 4).
  • the router 9 2 #a transmits the I frame shown in (1) transmitted from the image transmission unit 90 # 1.
  • the I frame is transmitted to the router 92 #d as shown in (11) in FIG.
  • the 1-frame, B-frame, and P-frame shown in (2), (3), and (4) transmitted from the image transmission module 90 # 1 also have the IP header.
  • the router 92 2 #d receives the IP packet of the I frame shown in (12) transmitted from the image transmission unit 90 # 1, the destination IP address is the address of the multi-group group 2 244.3. Since it is 3.3, as shown in (22) in FIG. 8, the packet is transmitted to the proxy server 96, which is the route to the image receiving section 102 # 4 of the multicast toggle 2.
  • the destination IP address is the address of the multi-group group 1 2 4 4.2. Since it is 2.2, as shown in (23) and (24) in FIG. 8, the image is transmitted to the image receiving unit 94 # 1 and is transmitted to the image receiving units 9 4 # 2 and 9 4 # 3 (not shown). Send to.
  • the image receiving unit 94 # 1 receives the IP packet of the I frame, B frame, and P frame transmitted from the router 92 #d as shown in (21), (23), and (24) in FIG. Receiving the Decrypt. As described above, the image receiving unit 94 # 1 accommodated in the wideband network can receive all types of frames.
  • the proxy server 96 receives the packet shown at (22) in FIG. 8 from the router 92 #d and, as shown at (31) in FIG. Evening Send to 100 # g.
  • the image shown in (12) sent from the image sending unit 90 # 1 When receiving the I-frame IP packet shown in (31) sent from the proxy server 96, the image shown in (12) sent from the image sending unit 90 # 1
  • the destination IP address is the address of multi-group group 2 24.3.3.3.3, so the multicast is performed as shown in (41) in FIG. Transmit to router 100 #h, which is the route to image receiving unit 102 # 4 of group 2.
  • the IP packet of the I frame shown in (41) shown in (41) is received from router 100 #g, it receives the image as shown in (51) in Fig. 8. Part 1 ⁇ 2 Send to # 4.
  • the image receiving section 102 # 4 receives the address 2 2 of the multicast group 2 permitted to participate in the IP packet header. ⁇ Since 3.3.3 is set, the IP packet is received and decrypted.
  • the multicast function it is possible to convert a coded image into a low-band signal without providing a code conversion unit. According to the embodiment described above, it is possible to convert image data into low-band data using only the multicast function of the IP protocol at the network layer level without providing a special circuit. Cost can be reduced.
  • a multicast group 1 composed of an image receiving unit accommodated in a wideband network and a multicast group 2 composed of an image receiving unit accommodated in a low-bandwidth network are used.
  • a multicast group for the image receiving unit may be provided.
  • the multicast management server sends a multicast group 1 capable of receiving I-frames to the image receiving unit accommodated in the intranet and a P / B frame. Allow multicast group 2 'that can receive the system.
  • the I frame is received by the image receiving unit accommodated in the Internet. Allow to join reliable multicast group 1 '. Then, the image transmitting unit sets the multicast address of multicast group 1 for the I-frame in the IP header and transmits the IP address, and transmits the multicast address of multicast group 2 'for the PZB frame. Set the address in the IP header and send.
  • FIG. 9 is a configuration diagram of an image transmission network according to the third embodiment of the present invention. Components that are substantially the same as the components in FIG. 2 are given the same reference numerals. As shown in Fig. 9, the image transmission network is composed of an intranet 120 and an internet 122. Intranet 120 is composed of multiple image transmitters 130 #i
  • the intranet 120 is composed of a broadband network.
  • the interface 1 2 2 has multiple
  • IP uses the TTL field in the small IP packet header to prevent packets from circulating indefinitely on the network, and decrements the TTL value each time an IP packet is routed. When the TTL value becomes smaller than 0, the IP packet is discarded. In the present embodiment, a TTL field is used.
  • FIG. 10 is a configuration diagram of the image transmission unit 130 #i in the figure. Components that are substantially the same as the components in FIG. 3 are given the same reference numerals.
  • the image transmission unit 130 #i is composed of the image encoding unit 60 #i, the frame type IP packetization unit 150 #i and the IP packet transmission unit 64 # have i.
  • the frame type-specific IP packetizing unit 130 #i has the following functions. (1) Each image frame of I frame, P frame and B frame is converted into an IP packet. (2) Create an IP packet header containing the following TTL value and add it to the IP packet.
  • the TTL value of the P frame and the B frame is calculated from the image transmitting section 130 # i to the image receiving section 44 # # accommodated in the intranet 120.
  • the TTL of the P frame is set to the same value as the TTL of the I frame. ⁇ 4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2. 1
  • the TTL of the IP packet header is decremented. If the TTL is 0 or more, the IP packet is sent to the destination corresponding to the destination IP address. If it is smaller, the IP packet is discarded.
  • FIG. 11 is an explanatory diagram of the operation of FIG. The operation of FIG. 9 will be described with reference to FIG. .
  • the IP packet addressed to the image receiving unit 4 4 # 1 is decremented in TTL at 42 #a, and as shown in (101) in Fig.
  • the I-frame Is set to TTL 6 and transmitted to the image receiving unit 52 # 4, and the PZB frame is discarded as a negative value. That is, the image receiving section 52 # 4 accommodated in the Internet 122 can receive only the I frame. According to the embodiment described above, image data can be converted to low-bandwidth data only by using a network-layer-level IP protocol without providing a special circuit, and cost can be reduced. You.
  • the transfer rate of image data to the low-bandwidth network is controlled using the IP protocol, so that the encoding conversion unit is not required and the cost can be reduced.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Cette invention concerne un réseau de transmission d'images comprenant une unité de transmission d'images qui permet de créer un paquet renfermant un trame à codage image codée par le procédé de codage correspondant et de transmettre le paquet; une pluralité de routeurs; un serveur; et une unité de réception d'images. L'unité de transmission d'images comprend une unité de création d'en-tête type par type permettant de fixer dans chaque en-tête de paquet une valeur en fonction du type de trame codée image contenue dans le paquet. Le serveur comprend une unité de filtre assurant le filtrage du paquet, qu'il laisse passer ou élimine selon la valeur fixée dans l'en-tête de paquet.
PCT/JP2002/003427 2002-04-05 2002-04-05 Reseau de transmission d'images WO2003085907A1 (fr)

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JP2003582970A JP3914204B2 (ja) 2002-04-05 2002-04-05 画像伝送ネットワーク
PCT/JP2002/003427 WO2003085907A1 (fr) 2002-04-05 2002-04-05 Reseau de transmission d'images

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PCT/JP2002/003427 WO2003085907A1 (fr) 2002-04-05 2002-04-05 Reseau de transmission d'images

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006246395A (ja) * 2005-03-07 2006-09-14 Fujitsu Ltd マルチキャストプロキシ装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09326825A (ja) * 1996-06-04 1997-12-16 Chokosoku Network Computer Gijutsu Kenkyusho:Kk マルチキャスト接続方法
JP2933905B1 (ja) * 1998-02-04 1999-08-16 株式会社エイ・ティ・アール環境適応通信研究所 マルチキャスト通信システム
JP2000078573A (ja) * 1998-09-03 2000-03-14 Hitachi Ltd 階層符号化データ配信装置
EP0996252A2 (fr) * 1998-10-21 2000-04-26 Fore Systems, Inc. Procédé efficace pour le stockage d' arbres d'émission multidestinataire
JP2001352533A (ja) * 2000-06-07 2001-12-21 Kddi Corp 階層符号化ビデオ配信システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09326825A (ja) * 1996-06-04 1997-12-16 Chokosoku Network Computer Gijutsu Kenkyusho:Kk マルチキャスト接続方法
JP2933905B1 (ja) * 1998-02-04 1999-08-16 株式会社エイ・ティ・アール環境適応通信研究所 マルチキャスト通信システム
JP2000078573A (ja) * 1998-09-03 2000-03-14 Hitachi Ltd 階層符号化データ配信装置
EP0996252A2 (fr) * 1998-10-21 2000-04-26 Fore Systems, Inc. Procédé efficace pour le stockage d' arbres d'émission multidestinataire
JP2001352533A (ja) * 2000-06-07 2001-12-21 Kddi Corp 階層符号化ビデオ配信システム

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Hayder M. Radha et al., "The MPEG-4 Fine Grained Scalable Video Coding Method for Multimedia Streaming Over IP", IEEE Transactions on Multimedia, Vol.3, No.1 (March 2001), pages 53 to 68 *
Mitsuru MARUYAMA, Internet ni Okeru Multi Media Gijutsu, bit, published by Kyoritsu Shuppan Co., Ltd., Vol.26, No.11, 01 November, 1994 (01.11.94), pages 4 to 14, "3.3 threshold to TTL" *
Shigeyuki Sakazawa et al., "A Coding and Transmission Control Scheme for Video Multicast", Eizo Joho Media Gakkaishi, Vol.52, No.6(1998), pages 863 to 870 *
Xue Li et al., "Layered Video Multicast with Retransmission(LVMR): Evaluation of Error Recovery Schemes", Proceedings of the IEEE 7th International Workshop on Network and Operating System Support for Digital Audio and Video (19-21 May 1997), pages 161 to 172 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006246395A (ja) * 2005-03-07 2006-09-14 Fujitsu Ltd マルチキャストプロキシ装置

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