WO2012004924A1 - 映像品質管理システム - Google Patents
映像品質管理システム Download PDFInfo
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- WO2012004924A1 WO2012004924A1 PCT/JP2011/002799 JP2011002799W WO2012004924A1 WO 2012004924 A1 WO2012004924 A1 WO 2012004924A1 JP 2011002799 W JP2011002799 W JP 2011002799W WO 2012004924 A1 WO2012004924 A1 WO 2012004924A1
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- quality
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- control information
- video
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
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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]
- H04N21/60—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
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/637—Control signals issued by the client directed to the server or network components
Definitions
- the present invention relates to a management system for ensuring stable video quality in a video communication service.
- the user experience quality in the video communication service is considered to be determined by various parts and factors such as the quality related to the encoding state of the video content, the quality related to the network transmission, and the quality related to the end user environment. Therefore, it is required to collect and manage the quality parameters of each part. In particular, regarding the quality of experience element of the end user environment, it is necessary to monitor, estimate, and manage quality parameters obtained on the video receiving terminal side.
- the present invention has been made to solve the above-described problems, and suppresses the processing load and communication load of the entire system related to quality estimation, and the quality management device side is individually generated in the environment of the video receiving terminal side. It is an object of the present invention to provide a video quality management system capable of performing dynamic and fine-tuned control for acquiring quality information in consideration of the state and degree of quality degradation.
- the present invention relates to a video quality management system in which a receiving terminal that receives video content distributed from a video distribution apparatus and a quality management apparatus that performs quality management of video and audio content in the receiving terminal are connected via a network.
- the terminal stores in advance quality control information including a receiving unit that acquires parameters related to quality degradation factors from video content, a quality information generating unit that generates quality information based on the parameters, and a parameter threshold value.
- the first quality control information management unit that updates and stores the changed quality control information, the value of the quality information parameter, the first Compare the parameter threshold value of the quality control information stored in the quality control information management unit.
- a quality information determination unit that performs transmission control of the quality information, and a quality information transmission unit that transmits the quality information to the quality management device based on a transmission control instruction of the quality information determination unit.
- a quality information receiving unit that receives quality information transmitted from the quality information transmitting unit, a quality estimation unit that estimates a quality evaluation value from the quality information received by the quality information receiving unit, and the quality evaluation value satisfies a predetermined quality level If not, a second quality control information management unit that changes the quality control information, and a quality control information transmission unit that transmits the quality control information changed in the second quality control information management unit to the designated video receiving terminal Are provided.
- the receiving terminal compares the parameter value of the quality information with the threshold value of the parameter of the quality control information stored in the first quality control information management unit, and the parameter value indicates the threshold value.
- a second quality control that changes the quality control information when the quality management device determines that the quality evaluation value does not satisfy a predetermined quality level, and includes a quality information determination unit that performs transmission control of the quality information when the number is exceeded. Since the information management unit is provided, the control for acquiring quality information from the video receiving terminal can be performed dynamically and finely. In addition, the processing load and communication load of the entire video quality management system related to quality estimation can be suppressed.
- FIG. 2 is a block diagram showing a configuration of a video receiving terminal of the video quality management system according to Embodiment 1.
- FIG. 1 is a block diagram illustrating a configuration of a quality management device in a video quality management system according to Embodiment 1.
- FIG. It is a figure which shows the structural example of the quality information by Embodiment 1.
- FIG. It is a figure which shows the structural example of the quality control information by Embodiment 1.
- FIG. 6 is a sequence diagram illustrating an operation of the video quality management system according to Embodiment 1.
- FIG. 4 is a flowchart showing an operation of a video receiving terminal in the video quality management system according to the first embodiment.
- FIG. 6 is a flowchart showing the operation of the quality management apparatus in the video quality management system according to the first embodiment.
- 6 is a block diagram illustrating a configuration of a video receiving terminal in a video quality management system according to Embodiment 2.
- FIG. 10 is an explanatory diagram illustrating a configuration example of quality control information according to Embodiment 2.
- FIG. 6 is a flowchart showing an operation of a video receiving terminal in the video quality management system according to the second embodiment.
- FIG. 10 is a block diagram illustrating a configuration of a quality management device in a video quality management system according to a third embodiment. 10 is a flowchart showing the operation of the quality management apparatus in the video quality management system according to the third embodiment.
- FIG. 1 is a diagram showing a configuration of a video quality management system according to the first embodiment.
- the video quality management system includes a video distribution device 1, a wide area network 2, a home gateway terminal 3, a home network 4, a video reception terminal (reception terminal) 5, a television 6, and a quality management device 7.
- the video distribution apparatus 1 manages and transmits video content, and re-encodes video content as necessary.
- the wide area network 2 is a communication infrastructure for providing a video communication service.
- the home gateway terminal 3 performs bidirectional packet transfer processing from the wide area network 2 as an entrance to the home network.
- the home network 4 forms a home network.
- the video receiving terminal 5 performs processing for receiving the video content transmitted from the video distribution device 1.
- the television 6 is an output destination of video content received by the video receiving terminal 5.
- the quality management device 7 collects, estimates, and manages quality information input from the video receiving terminal 5.
- FIG. 2 is a block diagram showing the configuration of the video receiving terminal in the video quality management system according to the first embodiment.
- the video receiving terminal 5 includes a communication I / F unit 50, a video packet reception control unit (reception unit) 51, a decoding processing unit 52, a video output control unit 53, a quality information generation unit 54, a quality information determination unit 55, and a quality information transmission.
- the communication I / F unit 50 performs a connection process with the home network 4.
- the video packet reception control unit 51 receives video content distributed from the video distribution device 1 and performs reception control of the video packet, and also causes quality degradation factors (packet loss, extension and fluctuation) generated and detected in the end user environment. Measurement source data constituting a physical quality control parameter group related to the above.
- the decode processing unit 52 performs video packet decoder control.
- the video output control unit 53 controls output of video data to the television 6.
- the quality information generator 54 generates quality information by performing arithmetic operations as necessary on the measurement source data constituting the quality control parameter group.
- the quality information determination unit 55 compares values of quality information and quality control information described later, and determines whether or not to transmit the quality information to the quality management device 7.
- the quality information transmission unit 56 transmits the quality information to the quality management device 7 based on the determination result of the quality information determination unit 55.
- the quality control information receiving unit 57 receives quality control information transmitted from the quality management device 7.
- the quality control information management unit 58 stores and updates the quality control information received by the quality control information receiving unit 57.
- FIG. 3 is a block diagram showing the configuration of the quality management apparatus in the video quality management system according to the first embodiment.
- the quality management device 7 includes a communication I / F unit 70, a quality information reception unit 71, a quality estimation unit 72, a quality control information management unit (second quality control information management unit) 73, a quality control information transmission unit 74, and quality control information.
- the presentation part 75 is comprised.
- the communication I / F unit 70 performs connection processing with the wide area network 2.
- the quality information receiving unit 71 receives quality information transmitted from the video receiving terminal 5.
- the quality estimation unit 72 estimates a quality evaluation value (QoE value) from the received quality information using a specific algorithm.
- QoE value quality evaluation value
- the quality control information management unit 73 stores quality control information indicating a threshold value of the quality management parameter group in the quality information, and if the quality evaluation value does not satisfy a certain evaluation level, the quality control information is stored. change.
- the quality control information transmitting unit 74 transmits the quality control information to the quality control information receiving unit 57 of the video receiving terminal 5.
- the quality control information presentation unit 75 is a presentation input unit that presents quality control information and allows the user to manually change the quality control information.
- FIG. 4 is a diagram illustrating a configuration example of quality information according to the first embodiment.
- the quality information 100 includes, for example, video receiving terminal / identification information 100A, transmission / reception address information 100B, measurement section information 100C, “delay information of received packet”, “fluctuation information of received packet”, “terminal buffering size information”, and the like.
- the quality control parameter group 100D includes physical quality control parameters related to quality degradation factors (packet loss, delay, fluctuation, etc.) that are generated and detected in the end user environment.
- the quality information 100 is input information when the quality estimation unit 72 of the quality management device 7 estimates a quality evaluation value (QoE value) based on a specific algorithm.
- QoE value quality evaluation value
- FIG. 5 is a diagram illustrating a configuration example of the quality control information according to the first embodiment.
- the quality control information 200 includes, for example, the video receiving terminal / identification information 200A, “threshold of loss / recovery packet information per unit time”, “threshold of delay information of received packet”, “fluctuation information of received packet” It consists of threshold data 200B of a physical quality control parameter group related to quality degradation factors, such as “threshold” and “threshold value of terminal buffering size information”.
- the quality control information 200 indicates a threshold value of the quality control parameter group 100D included in the quality information 100, and is compared with quality information generated during video reception at the video receiving terminal 5 to determine quality degradation. Used to detect.
- FIG. 6 is a sequence diagram showing the operation of the video quality management system according to the first embodiment.
- the video distribution device 1 distributes video content to the video receiving terminal 5 (step ST1).
- the video receiving terminal 5 receives the video content distributed in step ST1, acquires various quality management parameters such as the number of lost packets and the number of recovered packets from the video content, and measures and calculates the quality as necessary. Information is generated (step ST2). Further, the video receiving terminal 5 compares the value of the quality control parameter group 100D with the value of the threshold data 200B of the quality control information preset and stored in the quality control information management unit 73, and the quality of the video content is degraded. Whether or not has occurred is determined (step ST3).
- step ST3 If it is determined in step ST3 that no quality degradation has occurred, the process returns to step ST1. On the other hand, if it is determined that quality degradation has occurred, the quality information is transmitted to the quality management device 7 via the quality information transmission unit 56 (step ST4).
- the quality management device 7 estimates a quality evaluation value (QoE value) from the received quality information using a specific algorithm (step ST5). Furthermore, the quality management device 7 determines whether or not the estimated quality evaluation value satisfies a certain quality level (step ST6).
- QoE value quality evaluation value
- Step ST7 a change is made to lower the value of the threshold data 200B of the quality control information (step ST7), and the changed quality control information is transmitted to the video receiving terminal 5.
- Step ST8 The video receiving terminal 5 receives the quality control information transmitted from the quality management device 7, and updates and stores the quality control information (step ST9).
- the value of the threshold data 200B of the quality control information can be temporarily reduced, and the result of the comparison determination as to whether or not quality degradation based on the quality information and the quality control information has occurred in step ST3. Transmission frequency can be increased.
- Step ST4 'to step ST9' and step ST4 "in FIG. 6 are the same sequence as step ST4 to step ST9 described above. Specifically, since the quality control information in which the value of the threshold data 200B is lowered in step ST9 is updated and stored, the quality is transmitted from the video receiving terminal 5 to the quality management device 7 in step ST4 ′. Increases frequency of information transmission. Thereby, the quality management apparatus 7 can collect quality information finely.
- step ST5 ′ and step ST6 ′ determines whether the estimated quality evaluation value satisfies a certain quality level. If it is determined in the processing of step ST5 ′ and step ST6 ′ that the estimated quality evaluation value satisfies a certain quality level, the value of the threshold data 200B of the quality control information is increased in step ST7 ′. The change is made, and the changed quality control information is transmitted to the video receiving terminal 5 in step ST8 ′. The video receiving terminal 5 updates and stores the quality control information transmitted as step ST9 ′. Thereby, the value of the threshold value data 200B of the quality control information returns to the original state, and the transmission frequency of the quality information transmitted from the video receiving terminal 5 decreases (returns to the original state) (step ST4 ′′).
- FIG. 7 is a flowchart showing the operation of the video receiving terminal in the video quality management system according to the first embodiment.
- the video packet reception control unit 51 receives the video / audio packet distributed from the video distribution device (step ST11), and the header information of the video / audio packet is received.
- the quality control parameters are acquired with reference to the above, and output to the quality information generation unit 54 (step ST12).
- the quality information generation unit 54 generates the quality information of the data table shown in FIG. 4 based on the quality control parameter input in step ST12, and outputs it to the quality information determination unit 55 (step ST13).
- the quality control information receiving unit 57 receives the quality control information transmitted from the quality management device 7 and sends it to the quality control information managing unit 58. Output (step ST18).
- the quality control information management unit 58 updates and stores the quality control information newly acquired in step ST18 (step ST19).
- the quality information determination unit 55 reads the quality control information stored in the quality control information management unit 58 (step ST14), and the value of the threshold data 200B of the quality control information and the quality information input in step ST12.
- the value of the quality control parameter group 100D is compared, and it is determined whether or not the value of the quality control parameter group 100D is larger than the value of the threshold data 200B (step ST15). If it is determined in step ST15 that the threshold data is smaller than 200B, the process returns to step ST11 and the above-described process is repeated. On the other hand, if it is determined in step ST15 that it is larger than the threshold data 200B, it is determined that quality degradation has occurred, and the quality information transmission unit is configured to transmit the quality information to the quality management device 7.
- the quality information transmission unit 56 transmits the quality information to the quality management device 7 (step ST16).
- the video packet reception control unit 51 determines whether or not the reception of the video communication service packet has ended (step ST17), and ends the process when it is determined in step ST17 that the reception has ended. On the other hand, if it is determined that the process has not ended, the process returns to step ST11 and the above-described process is repeated.
- FIG. 8 is a flowchart showing the operation of the quality management apparatus in the video quality management system according to the first embodiment.
- the quality information receiving unit 71 receives the quality information input from the video receiving terminal 5 via the communication I / F unit 70, and outputs it to the quality estimation unit 72 (step ST21).
- the quality estimation unit 72 estimates a quality evaluation value (QoE value) from the quality information input in step ST21 using a specific algorithm (step ST22), and stores the estimated quality evaluation value in the quality control information management unit 73. (Step ST23).
- the quality control information management unit 73 determines whether or not the stored quality evaluation value is below a certain quality level (for example, draws a quality level management table) (step ST24). If it is determined in step ST24 that the quality level is equal to or higher than a certain quality level, the process returns to step ST21. On the other hand, if it is determined in step ST24 that the quality level is below a certain quality level, the value of the threshold data 200B of the stored quality control information is lowered (step ST25).
- a certain quality level for example, draws a quality level management table
- the quality control information transmitting unit 74 specifies the destination video receiving terminal 5 and transmits the quality control information changed in step ST25 (step ST26).
- the quality information receiving unit 71 determines whether or not the quality management of the video communication service has ended (step ST27). If it is determined in step ST27 that the quality information receiving unit 71 has ended, the process ends. On the other hand, if it is determined that the process has not been completed, the process returns to step ST21 and the above-described process is repeated.
- the configuration is such that the quality control information is changed (the value of the threshold data 200B is lowered) and transmitted in conjunction with the quality level determination based on the estimated quality evaluation value (QoE value) in step ST24.
- the present invention is not limited to this configuration, and is configured to transmit quality control information in which the value of the threshold data 200B is manually changed via the quality control information presenting unit 75 at completely independent timing. May be.
- the threshold data 200B of the quality management parameter group is defined as the quality control information, and the quality control information is transmitted from the quality management device 7 to the video receiving terminal 5.
- the collection of quality information from the video receiving terminal 5 can be performed flexibly and finely.
- the video receiving terminal 5 compares and evaluates the threshold data 200B of the quality control information and the quality management parameter group 100D, and determines whether or not to transmit the quality information. Therefore, it is possible to reduce the processing load and communication load of the entire system related to quality estimation.
- Embodiment 2 FIG. In the first embodiment, the configuration is shown in which the quality information transmission control is performed by passing the quality control information defining the threshold data 200B of the quality management parameter group. However, in the second embodiment, the quality control is performed. A configuration for defining quality information transmission time period or transmission time in the information and delivering the quality control information to perform quality information transmission control will be described.
- FIG. 9 is a block diagram showing the configuration of the video receiving terminal in the video quality management system according to Embodiment 2 of the present invention.
- a quality information storage unit 59 is provided instead of the quality information determination unit 55 of the video receiving terminal 5 of the first embodiment.
- symbol used in FIG. 2 is attached
- the quality information accumulation unit 59 accumulates the quality information generated by the quality information generation unit 54 in the storage area for a certain period of time.
- the quality control information management unit 58 sets a transmission timer based on the transmission timing time of the stored quality control information, and when the transmission timing is reached, sends a control instruction such as reading and outputting the quality information to the quality information transmission unit 56. Output. Based on the control instruction input from the quality control information management unit 58, the quality information transmission unit 56 reads the quality information from the storage area of the quality information storage unit 59 and outputs it to the quality management device 7.
- FIG. 10 is an explanatory diagram showing a configuration example of quality control information according to the second embodiment.
- the quality control information is used for designating temporal timing when the video receiving terminal 5 transmits the quality information.
- the quality control information 200 is a quality information time parameter group 200C composed of, for example, a video receiving terminal / identification information 200A, “quality information transmission time period” or “quality information transmission time”. Composed.
- FIG. 11 is a flowchart showing the operation of the video receiving terminal in the video quality management system according to the second embodiment, and the operation of quality information transmission will be described along this flowchart.
- the same steps as those of the video receiving terminal 5 of the first embodiment are denoted by the same reference numerals as those used in FIG.
- the quality information generation unit 54 generates the quality information of the data table shown in FIG. 4 based on the quality control parameters input in step ST12, and outputs the quality information to the quality information storage unit 59 (step ST31).
- the quality information storage unit 59 stores the quality information input in step ST31 in the storage area (step ST32).
- the quality control information receiving unit 57 receives the quality control information transmitted from the quality management device 7 and outputs the quality control information to the quality control information management unit 58 (step ST18).
- the quality control information management unit 58 updates and stores the quality control information newly acquired in step ST18 (step ST19). Further, a transmission timer is set with reference to the transmission timing time of the quality control information (step ST33), and it is determined whether or not the transmission timing has been reached (step ST34).
- step ST34 If it is determined in step ST34 that the transmission timing has not been reached, the process returns to the determination process in step ST34. On the other hand, if it is determined in step ST34 that the transmission timing has been reached, the control information instruction unit 56 reads out the quality information stored in the quality information storage unit 59 and transmits the quality information to the quality management device 7. Is output (step ST35). The quality information transmission unit 56 reads the quality information from the quality information storage unit 59 and transmits it to the quality management device 7 (step ST36).
- the video packet reception control unit 51 determines whether or not the reception of the video communication service packet has ended (step ST17), and ends the process when it is determined in step ST17 that the reception has ended. On the other hand, if it is determined that the process has not ended, the process returns to step ST11 and the above-described process is repeated.
- the operation of the quality management device 7 of the second embodiment is the time of the stored quality control information data when it is determined in step ST25 of FIG. 8 of the first embodiment that the quality control device 7 is below a certain quality level. Lower the value of the parameter group 200C. Other operations are the same as those in the first embodiment. Note that the information presented in the quality control information presentation unit 75 is different from that in the first embodiment. In the second embodiment, the quality control information presenting unit 75 presents the quality information delivery time period or transmission time as quality control information to the user, and the user manually changes the quality control information.
- the quality information transmission time period or transmission time is defined in the quality control information, and when the transmission time period or transmission time is reached, the video receiving terminal 5 sends the quality management device 7. Since the quality information is transmitted to the video receiving terminal 5, the timing for collecting the quality information from the video receiving terminal 5 can be controlled. Thereby, the processing load and communication load of the quality control apparatus 7 can be flattened.
- the structure which designates transmission timing time as quality control information was shown, it is not limited to this, As a transmission control condition of quality control information, for example, one broadcast program or video content It may be set so that the quality information is transmitted at the time when is finished. In this way, it is possible to specify the transmission timing based on an arbitrary condition that is not direct time information.
- the quality information generated during that time is stored in the storage area of the quality information storage unit 59, and finally. Send all at once. In this case, an arbitrary transmission timing is presented to the quality control information presentation unit 75, and the user manually changes the arbitrary transmission timing.
- the video receiving terminal 5 holds a public key in advance, and the quality information transmitting unit 56 compresses the quality information as a file.
- the data may be transmitted after being encrypted.
- the quality information receiving unit 71 of the quality management device 7 decompresses and decodes the received quality information.
- Embodiment 3 Quality information transmission control is performed by determining a change in quality control information based on content coding information transmitted in advance by the video distribution apparatus to the quality management apparatus 7 and delivering the quality control information.
- a configuration for performing is described.
- the configuration of the third embodiment can be applied to the above-described first and second embodiments.
- FIG. 12 is a block diagram showing the configuration of the quality management apparatus in the video quality management system according to Embodiment 3 of the present invention.
- an encoded information receiving unit 76 and an encoded information accumulating unit 77 are provided instead of the quality control information presenting unit 75 of the quality management device 7 of the first embodiment.
- the same components as those of the quality control device 7 according to the first embodiment are denoted by the same reference numerals as those used in FIG. 3, and the description thereof is omitted or simplified.
- the encoded information receiving unit 76 receives encoded information transmitted from the video distribution apparatus 1 illustrated in FIG. 1 via the wide area network 2.
- the encoding information is composed of, for example, an encoding method, a frame rate, and a video format.
- the encoded information accumulation unit 77 accumulates the encoded information received by the encoded information receiving unit 76 and provides it to the quality estimation unit 72 and the quality control information management unit 73.
- FIG. 13 is a flowchart showing the operation of the quality management apparatus in the video quality management system according to the third embodiment, and the operation of quality control information transmission will be described along this flowchart. Note that the same steps as those in the quality control apparatus 7 of the first embodiment are denoted by the same reference numerals as those used in FIG. 8 to simplify the description.
- the encoded information receiving unit 76 of the quality management device 7 receives the encoded information transmitted from the video distribution device 1 (step ST41), and stores the encoded information. It accumulates in the unit 77 (step ST42).
- the quality information receiving unit 71 receives the quality information input from the video receiving terminal 5 and outputs the quality information to the quality estimating unit 72 (step ST21).
- the quality estimation unit 72 estimates a quality evaluation value (QoE value) from the quality information input in step ST21 using a specific algorithm (step ST22), and stores the estimated quality evaluation value in the quality control information management unit 73. (Step ST23).
- the quality control information management unit 73 reads the encoded information from the encoded information storage unit 77 (step ST43), and the quality evaluation value stored in step ST23 is less than a certain quality level in consideration of the encoded information. (For example, a quality level management table is drawn) (step ST44).
- step ST44 If it is determined in step ST44 that the quality level is above a certain level, the process returns to step ST21. On the other hand, if it is determined in step ST44 that the quality level is below a certain level, the value of threshold data 200B of the stored quality control information is lowered (step ST45). Specifically, the value of the threshold data 200B of the quality control information is changed to a value that takes into account the encoding information.
- the quality control information transmitting unit 74 specifies the destination video receiving terminal 5 and transmits the quality control information changed in step ST45 (step ST26).
- the quality information receiving unit 71 determines whether or not the quality management of the video communication service has ended (step ST27). If it is determined in step ST27 that the quality information receiving unit 71 has ended, the process ends. On the other hand, if it is determined that the process has not been completed, the process returns to step ST21 and the above-described process is repeated.
- the control for collecting quality information from the video receiving terminal 5 can be more appropriately performed according to the encoded information of the distribution content.
- the video quality management system can perform dynamic and detailed control for acquiring quality information from the video receiving terminal, and can also perform overall control of the video quality management system related to quality estimation. Since the processing load and the communication load can be suppressed, it is suitable for use in a management system or the like for ensuring stable video quality in a video communication service.
- 1 video distribution device 2 wide area network, 3 home gateway terminal, 4 home network, 5 video receiving terminal, 6 TV, 7 quality control device, 50, 70 communication I / F unit, 51 video packet reception control unit, 52 decoding process Unit, 53 video output control unit, 54 quality information generation unit, 55 quality information determination unit, 56 quality information transmission unit, 57 quality control information reception unit, 58 quality control information management unit, 59 quality information storage unit, 71 quality information reception Section, 72 quality estimation section, 73 quality control information management section, 74 quality control information transmission section, 75 quality control information presentation section, 76 encoded information reception section, 77 encoded information storage section.
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Abstract
Description
実施の形態1.
図1は、実施の形態1による映像品質管理システムの構成を示す図である。この映像品質管理システムは、映像配信装置1、広域ネットワーク2、ホームゲートウェイ端末3、ホームネットワーク4、映像受信端末(受信端末)5、テレビ6および品質管理装置7で構成されている。
映像配信装置1は、映像コンテンツの管理および送出、また必要に応じて映像コンテンツの再符号化を行う。広域ネットワーク2は、映像通信サービスを提供するための通信基盤である。ホームゲートウェイ端末3は、広域ネットワーク2から宅内のネットワークの入口として双方向のパケット転送処理を行う。ホームネットワーク4は、宅内のネットワークを形成する。映像受信端末5は、映像配信装置1から送出された映像コンテンツの受信処理を行う。テレビ6は、映像受信端末5において受信された映像コンテンツの出力先である。品質管理装置7は、映像受信端末5から入力される品質情報を収集・推定・管理を行う。
図2は、実施の形態1による映像品質管理システムにおける映像受信端末の構成を示すブロック図である。
映像受信端末5は、通信I/F部50、映像パケット受信制御部(受信部)51、デコード処理部52、映像出力制御部53、品質情報生成部54、品質情報判定部55、品質情報送信部56、品質制御情報受信部57および品質制御情報管理部(第1品質制御情報管理部)58で構成されている。
通信I/F部50は、ホームネットワーク4との接続処理を行う。映像パケット受信制御部51は、映像配信装置1から配信される映像コンテンツを受信して映像パケットの受信制御を行うと共に、エンドユーザ環境において発生・検出される品質劣化要因(パケット損失、延長およびゆらぎなど)に関連する物理的な品質管理パラメータ群を構成する計測源データを取得する。デコード処理部52は、映像パケットのデコーダ制御を行う。映像出力制御部53は、映像データのテレビ6への出力制御を行う。
品質管理装置7は、通信I/F部70、品質情報受信部71、品質推定部72、品質制御情報管理部(第2品質制御情報管理部)73、品質制御情報送信部74および品質制御情報提示部75で構成されている。
まず、通信I/F部70は、広域ネットワーク2との接続処理を行う。品質情報受信部71は、映像受信端末5から送信される品質情報を受け付ける。品質推定部72は、受信した品質情報から特定のアルゴリズムを用いて品質評価値(QoE値)を推定する。品質制御情報管理部73は、品質情報中の品質管理パラメータ群のしきい値を示す品質制御情報を記憶すると共に、品質評価値が一定の評価レベルを満たしていない場合には当該品質制御情報を変更する。品質制御情報送信部74は、品質制御情報を映像受信端末5の品質制御情報受信部57に対して送信する。品質制御情報提示部75は、品質制御情報を提示し、ユーザが当該品質制御情報を手動で変更する提示入力手段である。
図4は、実施の形態1による品質情報の構成例を示す図である。
品質情報100は、例えば映像受信端末・識別情報100A、送受信アドレス情報100B、計測区間情報100Cおよび「受信パケットの遅延情報」や「受信パケットのゆらぎ情報」、「端末バッファリングサイズ情報」などで構成される品質管理パラメータ群100Dで構成される。品質管理パラメータ群100Dは、エンドユーザ環境で発生および検出される品質劣化要因(パケット損失、遅延、ゆらぎなど)に関連する物理的な品質管理パラメータで構成されている。この品質情報100は、品質管理装置7の品質推定部72において、特定のアルゴリズムに基づいて品質評価値(QoE値)を推定する際の入力情報となる。
品質制御情報200は、例えば映像受信端末・識別情報200Aおよび「単位時間当たりの損失/回復パケット情報のしきい値」や「受信パケットの遅延情報のしきい値」、「受信パケットのゆらぎ情報のしきい値」、「端末バッファリングサイズ情報のしきい値」などで構成される品質劣化要因に関連する物理的な品質管理パラメータ群のしきい値データ200Bで構成される。この品質制御情報200は、品質情報100に含まれる品質管理パラメータ群100Dのしきい値を示すものであり、映像受信端末5において映像受信中に生成される品質情報と比較判定して品質劣化を検出するために用いる。
図6は、実施の形態1による映像品質管理システムの動作を示すシーケンス図である。
映像配信装置1は、映像受信端末5に対して映像コンテンツを配信する(ステップST1)。映像受信端末5は、ステップST1において配信された映像コンテンツを受信し、当該映像コンテンツから損失パケット数や回復パケット数といった各種の品質管理パラメータを取得し、必要に応じて計測および演算することにより品質情報を生成する(ステップST2)。さらに映像受信端末5は品質管理パラメータ群100Dの値と、品質制御情報管理部73に予め設定および記憶されている品質制御情報のしきい値データ200Bの値とを比較し、映像コンテンツに品質劣化が発生しているか否か判定を行う(ステップST3)。
このように、一時的に品質制御情報のしきい値データ200Bの値を下げることが可能となり、ステップST3において品質情報と品質制御情報に基づく品質劣化が発生したか否かの比較判定の結果の送信頻度を高めることができる。
図7は、実施の形態1による映像品質管理システムにおける映像受信端末の動作を示すフローチャートである。
映像受信端末5において映像通信サービスのパケットの受信が開始されると、映像パケット受信制御部51は映像配信装置から配信される映像音声パケットを受信し(ステップST11)、当該映像音声パケットのヘッダ情報などを参照して品質管理パラメータを取得し、品質情報生成部54に出力する(ステップST12)。品質情報生成部54は、ステップST12において入力された品質管理パラメータに基づき図4で示したデータテーブルの品質情報を生成し、品質情報判定部55に出力する(ステップST13)。
品質情報受信部71は、通信I/F部70を介して映像受信端末5から入力される品質情報を受信し、品質推定部72に出力する(ステップST21)。品質推定部72は、ステップST21において入力された品質情報から特定のアルゴリズムを用いて品質評価値(QoE値)を推定し(ステップST22)、推定した品質評価値を品質制御情報管理部73に格納する(ステップST23)。
上記実施の形態1では、品質管理パラメータ群のしきい値データ200Bを定義した品質制御情報を受け渡しすることにより品質情報の送信制御を行う構成を示したが、この実施の形態2では、品質制御情報において品質情報の送信時間周期または送信時刻を定義し、当該品質制御情報を受け渡しすることにより品質情報の送信制御を行う構成について示す。
品質情報蓄積部59は、品質情報生成部54において生成された品質情報を一定時間、記憶領域に蓄積する。品質制御情報管理部58は、記憶している品質制御情報の送信タイミング時間に基づき送信タイマを設定し、送信タイミングに達すると品質情報送信部56に対して品質情報の読み出しおよび出力といった制御指示を出力する。品質情報送信部56は、品質制御情報管理部58から入力される制御指示に基づき、品質情報蓄積部59の記憶領域から品質情報を読み出し、品質管理装置7へ出力する。
この実施の形態2において、品質制御情報は映像受信端末5が品質情報を送信する際の時間的タイミングを指定するために用いる。図10に示すように、品質制御情報200は例えば映像受信端末・識別情報200A、「品質情報の送信時間周期」あるいは「品質情報の送信時刻」などで構成される品質情報の時間パラメータ群200Cで構成される。
品質情報生成部54は、ステップST12において入力された品質管理パラメータに基づき図4で示したデータテーブルの品質情報を生成し、品質情報蓄積部59に出力する(ステップST31)。品質情報蓄積部59は、ステップST31において入力された品質情報を記憶領域に蓄積する(ステップST32)。
なお、品質制御情報提示部75に提示される情報は実施の形態1と異なる。この実施の形態2では、品質制御情報提示部75により品質制御情報として品質情報の送品時間周期あるいは送信時刻がユーザに提示され、ユーザがこれらの品質制御情報を手動で変更する。
実施の形態3では、映像配信装置が品質管理装置7に対して予め送信するコンテンツ符号化情報に基づいて品質制御情報の変更を決定し、当該品質制御情報を受け渡しすることにより品質情報の送信制御を行う構成について示す。なお、この実施の形態3の構成は、上述した実施の形態1および実施の形態2に適用することができる。
符号化情報受信部76は、図1において示した映像配信装置1から広域ネットワーク2を介して送信される符号化情報を受信する。符号化情報は、例えば符号化方式、フレームレートおよび映像フォーマットなどで構成されている。符号化情報蓄積部77は、符号化情報受信部76が受信した符号化情報を蓄積し、品質推定部72および品質制御情報管理部73に提供する。
まず、映像通信サービスの品質管理を開始する前に、品質管理装置7の符号化情報受信部76は、映像配信装置1から送信された符号化情報を受信し(ステップST41)、符号化情報蓄積部77に蓄積する(ステップST42)。その後、映像通信サービスの品質管理が開始されると、品質情報受信部71は、映像受信端末5から入力される品質情報を受信し、品質推定部72に出力する(ステップST21)。
Claims (10)
- 映像配信装置から配信される映像コンテンツを受信する受信端末と、前記受信端末における映像コンテンツの品質管理を行う品質管理装置とがネットワークを介して接続された映像品質管理システムにおいて、
前記受信端末は、前記映像コンテンツから品質劣化の要因に関連するパラメータを取得する受信部と、前記パラメータに基づき品質情報を生成する品質情報生成部と、前記パラメータのしきい値で構成される品質制御情報をあらかじめ記憶すると共に、前記品質管理装置から変更された品質制御情報が入力されると当該変更後の品質制御情報に更新して記憶する第1品質制御情報管理部と、前記品質情報のパラメータの値と、前記第1品質制御情報管理部に記憶された品質制御情報のパラメータのしきい値とを比較し、前記パラメータの値が前記しきい値を超過した場合に、前記品質情報の送信制御を行う品質情報判定部と、前記品質情報判定部の送信制御指示に基づき前記品質情報を前記品質管理装置に送信する品質情報送信部とを備え、
前記品質管理装置は、前記品質情報送信部から送信された品質情報を受信する品質情報受信部と、前記品質情報受信部が受信した品質情報から品質評価値を推定する品質推定部と、前記品質評価値が所定の品質レベルを満たしていないと判断すると、前記品質制御情報を変更する第2品質制御情報管理部と、前記第2品質制御情報管理部において変更された品質制御情報を指定された映像受信端末へ送信する品質制御情報送信部とを備えたことを特徴とする映像品質管理システム。 - 前記品質管理装置は、品質制御情報をユーザに提示し、前記品質制御情報の設定変更の操作を受け付ける品質制御情報提示部を備え、
前記第2品質制御情報管理部は、前記品質制御情報提示部により設定変更された品質制御情報を格納することを特徴とする請求項1記載の映像品質管理システム。 - 映像配信装置から配信される映像コンテンツを受信する受信端末と、前記受信端末における映像コンテンツの品質管理を行う品質管理装置とがネットワークを介して接続された映像品質管理システムにおいて、
前記受信端末は、前記映像コンテンツから品質劣化の要因に関連するパラメータを取得する受信部と、前記パラメータに基づき品質情報を生成する品質情報生成部と、前記品質情報を記憶領域に蓄積する品質情報蓄積部と、前記品質情報の送信タイミング情報を有する品質制御情報をあらかじめ記憶すると共に、前記品質管理装置から変更された品質制御情報が入力されると当該変更後の品質制御情報に更新して記憶し、前記送信タイミング情報が有する送信タイミングに達すると前記品質情報の送信制御を行う第1品質制御情報管理部と、前記第1品質制御情報管理部の送信制御指示に基づき前記品質情報蓄積部に蓄積された品質情報を前記品質管理装置へ送信する品質情報送信部とを備え、
前記品質管理装置は、前記品質情報送信部から送信された品質情報を受信する品質情報受信部と、前記品質情報受信部が受信した品質情報から品質評価値を推定する品質推定部と、前記品質評価値が所定の品質レベルを満たしていないと判断すると、前記品質制御情報を変更する第2品質制御情報管理部と、前記第2品質制御情報管理部において変更された品質制御情報を指定された映像受信端末へ送信する品質制御情報送信部とを備えたことを特徴とする映像品質管理システム。 - 前記送信タイミング情報は、品質情報の送信時間周期または送信時刻であることを特徴とする請求項3記載の映像品質管理システム。
- 前記品質管理装置は、品質制御情報をユーザに提示し、品質情報の送信時間周期または送信時刻の設定変更の操作を受け付ける品質制御情報提示部を備え、
前記第2品質制御情報管理部は、前記品質情報提示部により設定変更された品質制御情報を格納することを特徴とする請求項4記載の映像品質管理システム。 - 前記送信タイミング情報は、任意の指定条件であることを特徴とする請求項3記載の映像品質管理システム。
- 前記品質管理装置は、映像配信装置から配信されるコンテンツ符号化情報を受信する符号化情報受信部と、前記符号化情報受信部が受信したコンテンツ符号化情報を蓄積する符号化情報蓄積部とを備え、
前記第1品質制御情報管理部は、前記コンテンツ符号化情報を加味して品質評価値が所定の品質レベルを満たしているか判断することを特徴とする請求項1記載の映像品質管理システム。 - 前記品質管理装置は、映像配信装置から配信されるコンテンツ符号化情報を受信する符号化情報受信部と、前記符号化情報受信部が受信したコンテンツ符号化情報を蓄積する符号化情報蓄積部とを備え、
前記第1品質制御情報管理部は、前記コンテンツ符号化情報を加味して品質評価値が所定の品質レベルを満たしているか判断することを特徴とする請求項3記載の映像品質管理システム。 - 前記受信端末の品質情報送信部は、送信する品質情報を圧縮および暗号化し、
前記品質管理装置の品質情報受信部は、受信した品質情報を解凍および復号化することを特徴とする請求項1記載の映像品質管理システム。 - 前記受信端末の品質情報送信部は、送信する品質情報を圧縮および暗号化し、
前記品質管理装置の品質情報受信部は、受信した品質情報を解凍および復号化することを特徴とする請求項3記載の映像品質管理システム。
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- 2011-05-19 WO PCT/JP2011/002799 patent/WO2012004924A1/ja active Application Filing
- 2011-05-19 CN CN201180033187XA patent/CN102972042A/zh active Pending
- 2011-05-19 US US13/808,436 patent/US20130111538A1/en not_active Abandoned
- 2011-05-19 JP JP2012523505A patent/JP5562420B2/ja not_active Expired - Fee Related
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CN103067778B (zh) * | 2013-01-06 | 2015-12-23 | 北京华兴宏视技术发展有限公司 | 数据监测系统和数据监测方法 |
WO2020090810A1 (ja) * | 2018-10-30 | 2020-05-07 | 日本電信電話株式会社 | 品質情報収集システム、品質情報収集方法、及びプログラム |
JP2020072347A (ja) * | 2018-10-30 | 2020-05-07 | 日本電信電話株式会社 | 品質情報収集システム、品質情報収集方法、及びプログラム |
JP7074023B2 (ja) | 2018-10-30 | 2022-05-24 | 日本電信電話株式会社 | 品質情報収集システム、品質情報収集方法、及びプログラム |
Also Published As
Publication number | Publication date |
---|---|
JP5562420B2 (ja) | 2014-07-30 |
JPWO2012004924A1 (ja) | 2013-09-02 |
CN102972042A (zh) | 2013-03-13 |
EP2592829A4 (en) | 2014-09-17 |
EP2592829A1 (en) | 2013-05-15 |
US20130111538A1 (en) | 2013-05-02 |
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