WO2004077831A1 - 映像伝送システム、映像送信装置、映像受信装置および映像伝送方法 - Google Patents
映像伝送システム、映像送信装置、映像受信装置および映像伝送方法 Download PDFInfo
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- WO2004077831A1 WO2004077831A1 PCT/JP2004/001988 JP2004001988W WO2004077831A1 WO 2004077831 A1 WO2004077831 A1 WO 2004077831A1 JP 2004001988 W JP2004001988 W JP 2004001988W WO 2004077831 A1 WO2004077831 A1 WO 2004077831A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234327—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by decomposing into layers, e.g. base layer and one or more enhancement layers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
- H04N21/25808—Management of client data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/65—Transmission of management data between client and server
- H04N21/658—Transmission by the client directed to the server
- H04N21/6582—Data stored in the client, e.g. viewing habits, hardware capabilities, credit card number
Definitions
- the present invention relates to a video transmission system for transmitting video through a network.
- compression codes are usually compressed below a certain band according to the H.221 method or MPEG (Moving Picture Experts Group) method. Once encoded, once encoded video data can not change the video quality even if the transmission band changes.
- MPEG-4FGs Full Granularity Scalability
- the video data encoded by MP EG-4 FGS is a moving image stream for improving the quality of the moving image quality of the base layer, and one basic layer which is a moving image stream that can be decoded by itself. It is composed of at least one or more enhancement layers, which are image streams.
- the base layer is low-band, low-quality video data, and by adding this to the extension layer according to the band, high-quality image quality can be achieved with a high degree of freedom.
- the total data size of the enhancement layer to be transmitted is It is possible to control and adapt to various bands, and it is possible to transmit a picture of quality according to the band.
- the required quality of each terminal differs because the terminal's ability to receive video and the characteristics of the network used by each terminal (reception band) differ. There is a problem called.
- the quality mentioned here includes, for example, image quality, frame rate (smoothness of movement), error tolerance, resolution, delay, processing complexity and so on.
- FIG. 1 is a diagram showing an example of the configuration of a conventional video encoding apparatus.
- the video encoding circuit 12 performs video encoding using motion compensation (DCT) (Discrete Cosine Transform: quantization) on the input video signal.
- DCT motion compensation
- the encoded data is output to the layering circuit 14.
- the layering circuit 14 divides the encoded data input from the video encoding circuit 12 into M regions in blocks of NXN pixels used for DCT (however, both N and M are natural numbers) , M output encoded data to the bucketing buffer 16.
- the packetization buffer 16 transmits the divided coded data input from the layering circuit 14 by a channel of high priority from an area including low frequency components.
- low-priority channels are obtained even when network congestion occurs by dividing the DCT coefficients into regions and transmitting from low-frequency components to high-priority channels. Encoding in Since the data is discarded, it is possible to receive video with the image quality according to the bandwidth.
- a terminal with a large display screen in a limited transmission band receives an image with an image quality priority which is not smooth but which has a higher quality than a video with low image quality and smooth movement. Is desirable.
- terminals with smaller screens should receive low-quality, smooth-motion video rather than high-quality, non-smooth-motion video.
- terminals in a wireless environment with a high error rate in the network can be played back even in situations where errors are high and error tolerance is higher than videos that can be played back only in situations where error tolerance is low and errors are not occurring. It is desirable to receive various videos.
- An object of the present invention is to provide a video transmission system in which each terminal can receive video with a quality suitable for itself when a plurality of terminals having different characteristics receive video simultaneously.
- the video transmission system is a video transmission system for transmitting hierarchically encoded data from a video transmission apparatus to a video reception apparatus through a network, wherein the video transmission apparatus is a hierarchically encoded data.
- the video data comprises: a first transmission means for transmitting data on different channels from each other; a calculation means for grouping the channels according to quality to calculate a group list; and a second transmission means for transmitting the calculated group list
- the receiving device comprises: a first receiving means for receiving a group list transmitted from the video transmitting device; a determining means for determining a receiving channel using the received group list; and the video transmitting device transmitted from the video transmitting device And second receiving means for receiving the data of the determined reception channel among the divided layer coding data.
- a video transmission apparatus comprises: division means for dividing hierarchical encoded data into separate channels according to quality or according to quality and bandwidth; and transmitting the divided hierarchical encoded data through different channels from each other And a second transmitting unit for transmitting the calculated group list.
- a video transmission method is a video transmission method for transmitting hierarchical encoded data from a video transmission device to a video reception device through a network, wherein the video transmission device is a hierarchical code.
- Receiving, and the video receiving apparatus determining a receiving channel using the received group list.
- the video reception device receiving data of the determined reception channel among the divided layer encoded data transmitted from the video transmission device.
- FIG. 1 is a diagram showing an example of the configuration of a conventional video encoding apparatus
- FIG. 2 is a diagram showing a configuration of a video transmission system according to Embodiment 1 of the present invention
- FIG. 3 is a diagram showing an example of a structure of coded data when using MPEG-4 FGS coding.
- FIG. 4 is a diagram showing an example of the result of channel division for the 13 coded data
- FIG. 5 is a flow chart showing the operation of the video transmission apparatus corresponding to the first embodiment
- Figure 6 A is a diagram to illustrate prioritization and grooving.
- Fig. 6B is a diagram for explaining the prioritization in the case of emphasis on movement.
- Fig. 6C is a diagram for explaining the prioritization when the image quality is emphasized.
- Figure 7 A is a diagram showing the priority map for motion-focused
- Fig. 7B is a diagram showing a priority map when image quality is emphasized.
- Figure 8 A shows an example of a priority map
- Fig. 8B is a diagram showing channels after prioritization based on the above priority map
- Fig. 9A is a diagram showing motion priority groups in the group list
- Figure 9B shows the image quality priority group in the group list.
- FIG. 9C is a diagram showing a full quality group in the group list
- FIG. 10 is a flowchart showing the operation of the video reception device corresponding to the first embodiment
- Fig. 11 is a sequence diagram showing exchange of main information in the video transmission system according to the first embodiment.
- FIG. 12 shows an application example of the video transmission system according to the first embodiment
- FIG. 13 shows a configuration of the video transmission system according to the second embodiment of the present invention
- FIG. 14 shows an embodiment of the present invention.
- FIG. 15 is a diagram showing the configuration of a video transmission system according to a third embodiment of the present invention
- FIG. 16 is a flowchart showing the operation of the video transmission apparatus corresponding to the third embodiment.
- Figure 17 A shows an example of a channel priority map
- Fig. 17 B is a diagram showing a part of the channel after prioritization based on the channel priority map.
- Figure 17 C shows an example of bucketing split and bucketing priority
- FIG. 18 is a diagram showing a configuration of a video transmission system according to a fourth embodiment of the present invention
- FIG. 19 is a flowchart showing an operation of the video reception apparatus corresponding to the fourth embodiment.
- the gist of the present invention is, in a system for transmitting a hierarchically encoded video stream, dividing the hierarchically encoded video stream according to quality or according to quality and bandwidth, and transmitting the same over different channels and channel according to quality. By grouping and transmitting the list, multiple receiving terminals can each select the reception quality of the video, and receive the video with appropriate quality.
- hierarchically encoded data is divided into channels according to quality and band, priority is calculated using terminal information, and transmission is performed on another channel, and dull list in which channels are grouped according to quality is transmitted.
- FIG. 2 is a diagram showing a configuration of a video transmission system according to Embodiment 1 of the present invention. is there.
- This video transmission system comprises a video transmission device (hereinafter also referred to as “transmission terminal”) 100 for transmitting video, a video reception device (hereinafter also referred to as “reception terminal”) 150 for receiving video, and a video transmission device 100. And a network 180 for relaying the video transmitted from the network to the video receiver 150. That is, the video transmitted from the video transmission device 100 is transmitted to the video reception device 150 through the network 180.
- the video transmission apparatus 100 includes a video input unit 102, a video encoding unit 104, a channel division unit 106, a video transmission unit 108, a terminal information reception unit 110, a priority calculation unit 112, and a group list.
- a calculation unit 1 14 and a group list transmission unit 1 16 are included.
- the video input unit 102 outputs an image provided from the outside or that is included in the video generated by the device 100 to the video coding unit 104 for each frame.
- the video coding unit 104 hierarchically codes the image output from the video input unit 102 as an input image, and outputs the obtained coded data to the channel division unit 106.
- the video encoding unit 104 includes a base layer (BL), an enhancement layer 1 (EL 1) that improves the image quality, an enhancement layer 2 (EL 2) that improves the smoothness of the motion, and an enhancement for the input image. It generates encoded data consisting of layer 3 (EL 3) and enhancement layer 4 (EL 4) and outputs it to channel division section 106.
- BL base layer
- EL 1 enhancement layer 1
- EL 2 enhancement layer 2
- EL 4 enhancement layer 4
- the image quality can be improved by adding the enhancement layer 1 to the base layer, and by adding data to the base layer in the order of the enhancement layer 2, the enhancement layer 3 and the enhancement layer 4, the movement Becomes smoother.
- the enhancement layer can divide the data into multiple parts from the lower layer (the beginning of the video stream), and by controlling the amount of data added to the base layer, It is possible to control the degree of quality to be improved.
- the channel division unit 106 divides the encoded data output from the video encoding unit 104 into a plurality of parts, assigns separate channels to each divided data, and outputs the divided data from the priority calculation unit 1 12. To the video transmission unit 1 0 8. Also, it generates a split list, which is a list of split data and allocation channels, and outputs it to the group list calculation unit 114. For example, an example of the channel division result is as shown in FIG. Details of the process will be described later.
- the video transmission unit 108 transmits the divided data output from the channel division unit 106 to the network 180 using the corresponding separate channels. Specifically, for example, the encoded data divided and assigned to different channels are added to the header with the specified priority, and multicasted by separate channels.
- the priority can be described, for example, in the Internet Protocol (IP) header. Also, it is assumed that the channel is indicated, for example, by multicast address.
- IP Internet Protocol
- multicast transmission is a transmission method of data from one transmitting terminal to a plurality of terminals at the same time, and is a method of transferring data only to a terminal designated to receive a multicast address, which is a transmission data channel, Even when the receiving terminal performs reception, there is no duplication in the data to be transmitted in the same transmission path, so it is a transmission method with good transmission efficiency.
- the transmission method of the video stream is not limited to multicast transmission.
- the terminal information reception unit 110 receives the terminal information transmitted from the reception terminal (video reception device 150), and outputs the terminal information to the priority calculation unit 112.
- the terminal information may be any information as long as it is information on the receiving terminal and can indicate the quality to be prioritized.
- the terminal information may include, for example, the screen size of the display device used by the receiving terminal, the processing capability of the terminal, and the error occurrence rate of the network to which the terminal is connected.
- the priority calculating unit 112 determines the channel priority using the terminal information output from the terminal information receiving unit 110, and outputs the determined priority to the channel dividing unit 106. Details of the process will be described later.
- Group list calculation unit 1 1 4 generates a group list, which is a list of priority quality and channels to be received, using the division list output from channel division unit 1 0 6, and group list transmission unit 1 1 Output to 6. Details of the process will be described later.
- the group list transmission unit 116 transmits the group list output from the group list calculation unit 114 to the network 180. Specifically, for example, the group list is transmitted to all the receiving terminals through the network 180.
- Network 180 has nodes (network nodes) not shown.
- the network node performs data transmission (packet transmission) according to the priority added to the channel. Specifically, if the network is congested, discard data from lower priority channels and guarantee data transmission for higher priority channels. Further, only data of the channel selected by the receiving terminal 150 among the plurality of channels transmitted from the transmitting terminal 100 is transferred to the receiving terminal 150.
- the network node is, for example, a router.
- a video receiver 150 has a terminal information transmitter 1 52, a priority quality input unit 1 54, a group list receiver 1 56, a reception channel determiner 1 58, a video receiver 1 60, a video decoder It has a part 1 62 and an image display part 1 6 4.
- the terminal information transmission unit 125 transmits the terminal information of the video reception device 150 to the video transmission device 100.
- the size of the display screen is transmitted as terminal information.
- the terminal information is information related to the receiving terminal as described above and is prioritized. Any information can be used as long as it can indicate the quality.
- the present embodiment will be described by way of an example in which terminal information is transmitted each time video data is received, the present invention is not limited to this. For example, it is also possible to transmit at regular intervals in order to avoid confusion on the transmission path.
- the priority quality input unit 1 54 outputs the priority quality designated by the user (for example, quality priority, motion priority, etc.) to the reception channel determination unit 1 58. However, if there is no specification from the user, priority quality output will not be performed.
- the group list receiving unit 1 56 receives the group list (list indicating the quality and the channel as described above) transmitted from the transmitting terminal (video transmitting apparatus 100), and receives the channel determination unit 1 5 8 Output to
- the reception channel determination unit 1 5 8 determines the channel to be received using the priority quality output from the priority quality input unit 1 5 4 and the dummy list output from the group list reception unit 1 5 6. Specifically, the channel number to be received is determined, and the determined channel number is output to the video receiver 160. However, if there is no output from priority quality input section 1 54 or group list receiving section 1 56, the previously determined channel number is output to video receiving section 1 6 0. Details of the process will be described later.
- the video receiver 160 receives the encoded data corresponding to the channel number output from the reception channel determiner 1 5 8, and outputs the received encoded data to the video decoder 16 2.
- the video decoding unit 126 decodes the encoded data output from the video receiving unit 160, and outputs the video obtained by decoding to the video display unit 164.
- the video display unit 164 displays the video output from the video decoding unit 126 on the screen.
- the image display unit 1 64 is composed of a display device.
- the flowchart shown in FIG. 5 is a storage device (not shown) of the video transmission device 100 (for example, a ROM or a flash). It is stored as a control program in a memory etc.) and executed by a CPU (not shown).
- step S 1 0 0 the image input unit 1 0 2 2 outputs an image forming the image to the image encoding unit 1 0 4 frame by frame.
- step S 1 100 the video coding unit 14 performs hierarchical coding on the image output from the video input unit 102, and the obtained coded data is divided into channel division units 1.
- coded data is composed of a base layer (B L) and multiple enhancement layers (E L).
- B L base layer
- E L enhancement layers
- FIG. 3 a case where encoded data is configured by one base layer (BL) and four enhancement layers (EL1 to 4) will be described as an example.
- step S 1200 the terminal information reception unit 110 receives the terminal information transmitted from the plurality of reception terminals 150 and outputs the same to the priority calculation unit 112.
- the terminal information is assumed to be the screen size (D inch) of the display device used by the receiving terminal 150.
- the terminal information is not limited to the screen size, and for example, information that can indicate a priority quality such as user preference (motion priority, image quality priority) may be used. It is possible.
- step S1300 the priority calculating unit 112 determines the priority of each channel using the terminal information output from the terminal information receiving unit 110, and determines the determined priority. Output to channel divider 106. That is, when the terminal information is received, the priority is determined using the received terminal information, and the determined priority is output to the channel division unit 106. On the other hand, when terminal information is not received, the previous priority is output to channel division section 106.
- the quality to be emphasized is determined using a plurality of pieces of terminal information Dn (n is a terminal number), and the priority of each channel is determined based on the emphasized quality.
- the procedure is as follows. 1) Calculation of average screen size
- N is the total number of terminals.
- channel division section 106 divides the encoded data output from video encoding section 104 into a plurality of sections, assigns separate channels to each divided data, and calculates priority calculation section 1 1 2. Is added to the priority that is output from and output to the video transmission unit 108.
- the base layer (BL) is one channel
- the enhancement layers (EL) 1 to 4 are each determined in advance. Divide by the amount of data and set it as another channel.
- the enhancement layer 1 is made to be EL 1-1-EL so that the bit rate of each channel becomes the set bit rate B-BL, B-EL 1, B_EL 2 and B-EL 3.
- the enhancement layer 3 into EL 3-0 to EL 3-3
- the number of divisions is not limited to four.
- Figure 8A shows a priority map, which is made up of a 4 by 4 matrix.
- the priorities of the enhancement layers EL 1-1 to EL 1-2 are sequentially shown.
- FIG. 8B The channels after priority assignment obtained by applying the priority map of FIG. 8A to the channel division result of FIG. 4 are as shown in FIG. 8B.
- step S1500 group list calculation section 114 generates a group list indicating channels to be received according to priority quality using the division list output from channel division section 106. Output to group list transmitter 116.
- FIG. 9 shows an example of the group list. In this example, three groups (motion priority, image quality priority, full quality) are calculated. Of course, the group list is not limited to three. Any combination of one or more channels is acceptable. For example, for the same type of quality, multiple groups with different degrees may be provided (see, for example, motion priority groups 1 and 2 and image quality priority groups 1 and 2 in FIG. 6A). That is, groups having different types and degrees of quality can be arbitrarily provided. In the example of FIG.
- the group list transmission unit 116 transmits the group list output from the group list calculation unit 114 to the network 180. Specifically, for example, the group list is transmitted to all the receiving terminals through network 180. In this embodiment, transmission of the group list is always performed.
- the present invention is not limited to this. For example, as described above, in order to avoid congestion of the transmission path, a fixed interval is provided. It is also possible to send
- step S 1 7 0 8 the video transmission unit 1 0 8 transmits the divided data output from the channel division unit 1 0 6 to the network 1 8 0 through the corresponding separate channels.
- Encoded data assigned to a channel is multicast-transmitted on separate channels with the specified priority added to the header.
- the channel is indicated by, for example, a multicast address.
- the flowchart shown in FIG. 10 is stored as a control program in a storage device (for example, ROM, flash memory, etc.) (not shown) of the video reception device 150, and is executed by the CPU (not shown).
- a storage device for example, ROM, flash memory, etc.
- the priority quality input section 1 54 outputs the priority quality designated by the user to the reception channel determination section 1 5 8.
- the priority quality is not output unless specified by the user.
- step S 2 0 0 the group list reception unit 1 5 6 receives the group list transmitted from the transmission terminal 1 0 0 and outputs it to the reception channel determination unit 1 5 8.
- step S2200 using the priority quality output from the priority quality input unit 154 and the group list 1 output from the group list reception unit 156 in the reception channel determination unit 158, Determine the channel to be received.
- the priority quality is motion priority
- the one receiving the circle ( ⁇ ) shown in FIG. 9A and the priority quality is motion priority
- the circle ( ⁇ ⁇ ) shown in FIG. 9B If the channel is to be received and if the priority quality is full quality, it is determined that the circle ( ⁇ ⁇ ⁇ ⁇ ) channel shown in Fig. 9C is to be received.
- step S 2300 the video reception unit 160 receives encoded data regarding the channel number output from the reception channel determination unit 1 58, and the received encoded data is received by the video decoding unit 16. Output to 2.
- step S 2400 the video decoding unit 126 decodes the encoded data output from the video receiving unit 160, and outputs the obtained video to the video display unit 164.
- step S 2500 the video display unit 164 displays the video output from the video decoding unit 126 on the screen.
- the terminal information transmission unit 152 transmits the terminal information of the receiving terminal 150 to the transmitting terminal 100.
- the terminal information as described above, transmit the screen size (D inch) of the display device used by the terminal.
- the terminal information is transmitted each time video data is received.
- the present invention is not limited to this. For example, as described above, in order to avoid congestion of the transmission path, It is also possible to transmit at regular intervals.
- the receiving terminal 150 transmits terminal information (for example, the size of the display screen) to the transmitting terminal 100 via the network 180 ((1)).
- terminal information for example, the size of the display screen
- the transmitting terminal 100 calculates the channel priority using the received terminal information ((2)), calculates the group list, and calculates the group. Send the list to the receiving terminal 150 via the network 180 ((3)).
- receiving terminal 150 When receiving terminal 150 receives the group list from transmitting terminal 100, receiving terminal 150 determines a receiving channel using the received group list ((4)). Then, transmitting terminal 100 performs video coding and channel division (including prioritization) on the input video for each frame, and gives the division priority after division. The coded data is transmitted to the receiving terminal 150 through the network 180 on separate channels ((5)). At that time, the network 180 performs data transmission (bucket transmission) according to the priority.
- the receiving terminal 150 receives the encoded video data from the transmitting terminal 1 0, 0 in the above reception channel, decodes it, and displays it on the screen ((6)).
- FIG. 12 shows an application example of the video transmission system of the present embodiment.
- a video server 100 is provided as a video transmission device, and a large screen terminal 150a, a small screen terminal 150b, and a low bandwidth terminal 150c are provided as video reception devices.
- the video server 100 and each terminal 150a to 150c are connected to each other through a network 180.
- Network 1 80 has LAN 1 82, Internet 1 84, and mobile network 1 86, and LAN 1 82 and Internet 1 84 are connected to each other through router 1 88, and LAN 1 8 2 And Mobile Network 186 are connected to each other via Router190.
- the video server 100 and the large screen terminal 150a are connected via the LAN 182
- the video server 100 and the small screen terminal 150b are the LAN 182
- the router 1 88, the Internet 1 84 Connected via a Video Server 100 and a low bandwidth terminal 150 c are connected via a LAN 182, a Router 190 and a Mobile Network 186.
- the large screen terminal 150 a can receive video with priority on image quality
- the small screen terminal 15 O b can receive video with motion priority
- the low band terminal 150 c can receive It is possible to receive an image with error tolerance priority.
- hierarchical coded data is divided into different channels according to quality and band, and a group list according to quality is transmitted. It is possible to receive video. Also, in order to calculate the priority of each channel based on the terminal information and prioritize transmission, each terminal selects and receives a priority quality group in the usable transmission band of the terminal, The highest quality picture automatically adapted to the characteristics of the self Can be received. In addition, it is possible to realize video transmission with quality matched to terminal characteristics.
- hierarchically encoded data is divided into channels according to quality and band, priority is calculated using input video information, and transmission is performed on another channel, and a group list according to quality is transmitted.
- a video transmission system in which the quality prioritized by the receiving terminal can be selected and the video can be received with the quality suitable for the video characteristics according to the network conditions will be described.
- FIG. 13 is a diagram showing a configuration of a video transmission system according to Embodiment 2 of the present invention.
- the video transmission apparatus 200 and the video reception apparatus 250 in this video transmission system have the same basic configurations as the video transmission apparatus 100 and the video reception apparatus 150 in the video transmission system shown in FIG. 2, respectively.
- the same components are denoted by the same reference numerals and the description thereof is omitted.
- the video transmission device 200 includes a video coding unit 104a, a video characteristic calculation unit 202, and a priority calculation unit 204. Also, the video reception device 250 does not have the terminal information transmission unit 125 shown in FIG. Similar to the video coding unit 104 shown in FIG. 2, the video coding unit 104a hierarchically codes the image output from the video input unit 102 as an input image, and the obtained coded data is divided into channel division units. Output to 06.
- the base layer (BL), the enhancement layer 1 (EL 1) for improving the image quality, and the motion smoothness are Generate encoded data consisting of enhancement layer 2 (EL 2), enhancement layer 3 (EL 3), and enhancement layer 4 (EL 4) to be raised (see Fig. 3), and output it.
- the video encoding unit 104 a further outputs the base layer (BL) to the video characteristic calculation unit 202.
- the video characteristic calculation unit 202 extracts the motion vector from the basic layer (BL) output from the video encoding unit 104 a, calculates the video characteristic of the input video, and obtains the obtained video characteristic. The value is output to priority calculation unit 2 0 4. Details of the process will be described later.
- the priority calculation unit 204 determines the priority of each channel using the video characteristic value output from the video characteristic calculation unit 202, and outputs a priority map to the channel division unit 106.
- the operation of the video transmission apparatus 200 having the above configuration will be described using the flowchart shown in FIG. Note that the flowchart shown in FIG. 14 is stored as a control program in a storage device (for example, ROM, flash memory, etc., not shown) of the video transmission device 200, and is executed by the network CP which is also not shown.
- a storage device for example, ROM, flash memory, etc., not shown
- step S 1 250 is inserted into the flow chart shown in FIG. 5 and step S 120 0 is deleted.
- Steps S 1 0 0 0 and S 1 1 0 0 are the same as the steps in the flowchart shown in FIG. However, in the present embodiment, at the time of the video encoding process in step S 1 100, the video encoding unit 1 0 4 a is configured to process the encoded data of the base layer (B) in the video characteristic calculation unit 2 0. Output to 2.
- step S 1 250 the video characteristic calculation unit 202 extracts the motion vector from the base layer (B) output from the video encoding unit 1 0 4 a and outputs the input video image.
- the characteristic is calculated, and the obtained image characteristic value is output to the priority calculation unit 204.
- motion vector information is extracted using the encoded data of the base layer output from the video encoding unit 104 a, and the absolute sum of the extracted motion vectors is calculated. Let the calculated absolute sum be the image characteristic value M.
- the image characteristic value M is a value representing the magnitude of motion in the image, and the larger the value of M is, the larger the motion is. Conversely, the smaller the value of M, the smaller the motion is. It is a big picture.
- the video characteristic value is the absolute sum of motion vectors
- the present invention is not limited to this, and it is possible to represent the size of the motion of the video. It may be something.
- step S1300 the priority calculation unit 204 determines the priority of each channel using the video characteristic value output from the video characteristic calculation unit 202, and the priority map is Output to divided part 106.
- the quality to be emphasized is determined using the video characteristics, and the priority of each channel is determined based on the quality to be emphasized.
- the procedure is as follows.
- the video characteristic value M is compared with the threshold value T H to determine the quality to be emphasized.
- the smoothness of motion is higher as the video characteristic value is larger, that is, the larger the motion of the video, motion is emphasized.
- the video characteristic value M exceeds the threshold TH (M> TH)
- the video characteristic value M is assumed, otherwise the video characteristic value M is equal to or less than the threshold TH (for example, In the case of M ⁇ TH), the image quality is emphasized.
- Steps S 1 4 0 to S 1 7 0 0 are the same as the steps of the flowchart shown in FIG.
- the hierarchical coding is divided into different channels by quality 'band and the group list by quality is transmitted, a plurality of receiving terminals can It is possible to freely select the priority quality and receive the video.
- the quality that greatly affects the subjective image quality with respect to the input video in the usable transmission band of each terminal Priority can be received. That is, it is possible to realize video transmission with an emphasis on appropriate quality in accordance with the video characteristics.
- hierarchically encoded data is divided by quality and band, and the priority calculated for each bucket in each channel is added and transmitted by another channel, and a group list by quality is transmitted.
- FIG. 15 is a diagram showing a configuration of a video transmission system according to Embodiment 3 of the present invention.
- the video transmission device 300 in this video transmission system has the same basic configuration as the video transmission device 100 in the video transmission system shown in FIG. 2, and the same components have the same reference numerals. The explanation is omitted.
- the video receiving apparatus 150 is completely the same as that shown in FIG. 2, the description thereof will be omitted.
- the video transmission device 300 has a channel division unit 302.
- the channel division unit 302 divides the encoded data output from the video encoding unit 104 into a plurality of parts, assigns separate channels to each divided data, and outputs the divided data from the priority calculation unit 1 12. Priorities are added, and further, bucket division is performed for each channel, packet priorities are calculated, packets are prioritized, and video transmission is performed.
- the divided data is output to the receiving unit 108, and the divided list is output to the group list calculating unit 114. Details of the process will be described later.
- the flowchart shown in FIG. 16 is stored as a control program in a storage device (for example, a ROM, a flash memory, etc.) (not shown) of the video transmission device 300, and is executed by a CPU (not shown).
- a storage device for example, a ROM, a flash memory, etc.
- step S 1420 and step S 1440 are inserted into the flowchart shown in FIG. 5, and step S 1400 is deleted.
- Steps S 1 00 to S 1 300 are the same as the steps of the flowchart shown in FIG.
- step S 1420 channel division section 302 divides encoded data in the same manner as in the first embodiment.
- the base layer is one channel (BL)
- enhancement layers (EL) 1 to 4 are each divided by a predetermined amount of data to be separate channels (see Fig. 4).
- the priority (see FIG. 8A) output from the priority calculation unit 112 is assigned to each channel (see FIG. 8B).
- the channel division unit 302 also calculates the priority of packets that constitute the channel.
- the packet is the minimum unit of data transmission, and refers to, for example, an IP packet.
- the specific procedure is as follows.
- FIG.17 shows an example of bucket priority calculation.
- Fig.17 A is a channel priority map and
- Fig.17 B is base layer (BL), enhancement layer 1 (EL 1
- FIG. 17 C shows an example of packet priority of a packet group divided for the channel EL 1-1.
- Figure 17 shows that the lower the number, the higher the priority.
- channel priority P is used, and in accordance with the following (equation 2),
- i is the packet group number at which the packet is located
- P i is the packet group priority
- K is the number of divided channels
- P is the channel priority. Note that the method for calculating the packet priority is not limited to the above (Equation 2).
- Steps S 1 500 to S 1 700 are the same as the steps of the flowchart shown in FIG.
- hierarchically encoded data is divided into different channels by quality and band, the channel is prioritized based on terminal information, and packets in the channel are further prioritized.
- transmission since transmission is performed, it is possible to preferentially receive coded data of quality suitable for the terminal characteristics automatically with finer precision in the usable transmission band of each terminal.
- the method of calculating the priority of the channel is not limited to the power S shown in the case of using the terminal information as in the first embodiment, and the method is not limited to this. It is also possible to use characteristics.
- Hierarchical coded data is divided by quality ⁇ band and transmitted on different channels.
- the type of prioritized quality is controlled according to the reception status of the receiving terminal, thereby achieving high subjective picture quality.
- FIG. 18 is a diagram showing a configuration of a video transmission system according to Embodiment 4 of the present invention.
- the video receiving apparatus 450 in this video transmission system has the same basic configuration as the video receiving apparatus 150 in the video transmission system shown in FIG. 2, and the same components have the same reference numerals. The explanation is omitted.
- the video transmission apparatus 100 is completely the same as that shown in FIG. 2, the description thereof will be omitted.
- the feature of this embodiment is to control the type of quality to be prioritized according to the reception status of the receiving terminal (for example, the data loss rate or the packet loss rate). Therefore, the video reception device 450 has a reception status calculation unit 4 52, a reception channel determination unit 4 5 4, and a video reception unit 1 6 0 a.
- the video receiving section 160a receives the encoded data corresponding to the channel number output from the receiving channel determining section 454, and receives the encoded data.
- the data is output to the video decoding unit 126.
- the total number of reception channels and the total number of channels that can successfully receive data are further output to reception status calculation unit 452.
- the reception status calculation unit 42 5 calculates the reception status using the information output from the video reception unit 160a. Specifically, the data loss rate L is calculated using the total number of reception channels and the total number of channels successfully received which are output from the video reception unit 160a, and the calculated data loss rate L is used as a reception channel determination unit. Output to 5 5 4. Details of the process will be described later.
- Reception channel determination unit 4 5 4 determines priority quality using data loss rate L output from reception status calculation unit 4 5 2, and determines the determined priority quality and group list reception unit 1 5 6 Channel number to receive using group list Are determined, and the determined channel number is output to the video reception unit 160a. However, if there is no output from the reception status calculation unit 4 52 or the group list reception unit 1 56, the channel number determined last is output to the video reception unit 1 6 0 a. Details of the process will be described later.
- the flowchart shown in FIG. 19 is stored as a control program in a storage device (for example, ROM, flash memory, etc., not shown) of the video reception device 450, and is not shown. Executed by PU.
- step S 2 0 5 0 is inserted into the flow chart shown in FIG. 10, and step S 2 0 0 0 is deleted.
- step S 2 0 5 the data loss rate L is calculated using the information (total number of received channels and total number of channels successfully received) output from the video reception unit 1 6 0 a in the reception status calculation unit 4 5 2
- the calculated and calculated data loss rate L is output to the reception channel determination unit 45 4.
- the data loss rate L is, for example, the following (Equation 3),
- Steps S 2 1 0 to S 2 6 0 0 are the same as the steps in the flowchart shown in FIG. However, in the present embodiment, the following processing is performed in the reception channel determination processing in step S2200.
- step S 220 the reception channel determination unit 4 54 determines the priority quality using the data loss rate L output from the reception status calculation unit 4 52, Further, the determined priority quality and the channel number to be received are determined using the group list output from the group list reception unit 156, and the determined channel number is output to the video reception unit 160a.
- the data loss rate is used using the reception status of the receiving terminal. If the data loss rate is high, select a motion priority that has a high frame rate and a small impact on the subjective image quality, and if not, select the image quality priority, so the subjective image quality does not depend on the reception status. You can receive high-quality video. That is, the reception quality can be improved according to the reception situation.
- each terminal when video is simultaneously received by a plurality of terminals having different characteristics, each terminal can receive video with a quality suitable for itself.
- the present invention has the effect of enabling each terminal to receive video with a quality suitable for itself when a plurality of terminals having different characteristics receive video simultaneously. It can be applied to a video transmission system that transmits video through a network
Description
Claims
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US10/514,440 US7382729B2 (en) | 2003-02-28 | 2004-02-20 | Video transmission of layered coded data |
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JP2003-053780 | 2003-02-28 | ||
JP2003053780A JP2004266503A (ja) | 2003-02-28 | 2003-02-28 | 映像伝送システム |
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US (1) | US7382729B2 (ja) |
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US20050175084A1 (en) | 2005-08-11 |
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