WO2007029731A1 - 映像コミュニケーション品質推定装置、方法、およびプログラム - Google Patents
映像コミュニケーション品質推定装置、方法、およびプログラム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
Definitions
- Video communication quality estimation apparatus apparatus, method, and program
- the present invention relates to a communication quality estimation technique, and more particularly to a technique for estimating quality related to video communication in which audio media and video media are exchanged bidirectionally.
- Interactive multimodal services that combine audio media and video media, such as video communication services such as Z-conference and collaboration services, are attracting attention.
- the Internet used for such services is a V network that does not necessarily guarantee communication quality
- the communication path connecting user terminals If the usable bandwidth is narrow or the network is congested, the user experience quality experienced by the user at the receiving terminal will deteriorate for audio and video.
- the processing time at the time of audio media and video media signal transmission includes the code processing time and transmission buffer time of the audio media and video media.
- delay time in the network such as routers that make up the network Processing time, network physical distance between communicators, etc.
- the processing time when receiving audio and video media signals includes reception buffer time and decoding time of audio and video media.
- the present invention is for solving such problems, and can estimate with sufficient accuracy the quality related to video communication in which audio media and video media are combined and exchanged bidirectionally.
- the purpose is to provide a video communication quality estimation device, method, and program. Means for solving the problem
- the video communication quality estimation apparatus exchanges audio media and video media in a bidirectional manner between communication terminals connected via a network.
- This is a video communication quality estimation device that estimates quality related to video communication. It is an audio media quality evaluation value that is a quality evaluation value for audio media output from a communication terminal, and a quality evaluation value for video media output from a communication terminal.
- the multimodal quality estimation unit that estimates the multimodal quality value, which is the quality evaluation value of the composite media that combines audio media and video media, and the audio media Voice delay time, which is the delay time from input to output between communication terminals
- Delay quality degradation amount estimation that estimates the amount of delay quality degradation caused by the delay between audio media and video media based on the video delay time that is the delay time from input to output of video media between communication terminals
- a video communication quality estimation unit that estimates the quality of the video communication based on the multimodal quality value estimated by the multimodal quality estimation unit and the delay quality degradation amount estimated by the delay quality degradation amount estimation unit.
- the video communication quality estimation method is a video communication method for estimating quality related to video communication in which audio media and video media are exchanged bidirectionally between communication terminals connected via a network.
- a video communication quality estimation method used in a quality estimation device wherein a multimodal quality estimation unit outputs an audio media quality evaluation value, which is a quality evaluation value for audio media output from a communication terminal, and a communication terminal.
- Multimodal quality estimation that estimates the multimodal quality value, which is the quality evaluation value of composite media that combines audio media and video media, based on the video media quality evaluation value, which is the quality evaluation value for the recorded video media Step and delay quality degradation amount estimation unit , Based on the audio delay time, which is the delay time from when the audio media is input between the communication terminals until it is output, and the video delay time, which is the delay time from when the video media is input between the communication terminals until it is output.
- the absolute delay quality degradation amount estimation step for estimating the delay quality degradation amount caused by the delay between the audio media and the video media, and the video communication quality estimation unit
- a video communication quality estimation step for estimating the quality of video communication based on the multimodal quality value estimated by the multi-modal quality estimation unit and the delay quality degradation amount estimated by the delay quality degradation amount estimation unit.
- the program according to the present invention is a video communication quality for estimating quality related to video communication in which audio media and video media are interactively exchanged between communication terminals connected via a network.
- the multi-modal quality estimator receives the audio media quality evaluation value, which is the quality evaluation value for the audio media output from the communication terminal, and the quality evaluation value for the video media output from the communication terminal, by the multimodal quality estimation unit.
- a multimodal quality estimation step for estimating a multimodal quality value which is a quality evaluation value of a composite media composed of audio media and video media, and a delay quality degradation amount estimation unit Delay until media is input and output between communication terminals
- the amount of delay quality degradation caused by the delay between the audio media and the video media is calculated based on the audio delay time between the video media and the video delay time between the video media being input and output between the communication terminals.
- the video communication quality estimation unit, the multimodal quality value estimated by the multimodal quality estimation unit, and the delay quality degradation amount estimated by the delay quality degradation amount estimation unit Based on the absolute delay quality degradation amount estimation step to be estimated, the video communication quality estimation unit, the multimodal quality value estimated by the multimodal quality estimation unit, and the delay quality degradation amount estimated by the delay quality degradation amount estimation unit. And a video communication quality estimation step for estimating the quality of the video communication.
- the multimodal quality estimation unit estimates the multimodal quality value based on the audio quality evaluation value and the video quality evaluation value
- the delay quality degradation amount estimation unit estimates the audio delay time.
- the amount of delay quality degradation is estimated based on the video delay time
- the video communication quality estimation unit estimates the video communication quality value based on the multimodal quality value and the amount of delay quality degradation. Therefore, it is possible to estimate video communication quality values that take into account quality degradation due to delays in audio and video media, and to ensure sufficient accuracy for video communication in which audio and video media are exchanged in both directions. Can be estimated.
- FIG. 1 is a block diagram showing a configuration of a video communication quality estimation device that works on the first embodiment of the present invention.
- FIG. 2 is a flowchart showing an overall processing operation of the video communication quality estimation apparatus that is useful for the first embodiment of the present invention.
- FIG. 3 is a flowchart showing a multimodal quality estimation process of the video communication quality estimation apparatus which is useful for the first embodiment of the present invention.
- Fig. 4 shows an example of the characteristics of the multimodal quality estimation model.
- FIG. 5 is a flowchart showing delay quality degradation amount estimation processing of the video communication quality estimation apparatus according to the first embodiment of the present invention.
- FIG. 6 is a characteristic example of a delay quality degradation amount estimation model.
- FIG. 7 is a flowchart showing a video communication quality estimation process of the video communication quality estimation device according to the first embodiment of the present invention.
- FIG. 8 is a characteristic example of the video communication quality estimation model.
- FIG. 9 is a graph showing an estimation result of the estimated video communication quality obtained in the present embodiment.
- FIG. 10 is an explanatory diagram showing a configuration of a main part of a video communication quality estimation apparatus according to a second embodiment of the present invention.
- FIG. 11 is a flowchart showing delay quality degradation amount estimation processing of the video communication quality estimation apparatus according to the second embodiment of the present invention.
- FIG. 12 is an example of characteristics of the absolute delay quality degradation estimation.
- FIG. 13 is a characteristic example of relative delay quality degradation amount estimation.
- FIG. 14 is a characteristic example of delay quality degradation amount estimation.
- FIG. 15 is an explanatory diagram showing a configuration of a main part of a video communication quality estimation device according to a third embodiment of the present invention.
- FIG. 16 is a flowchart showing delay quality degradation amount estimation processing of the video communication quality estimation apparatus according to the third embodiment of the present invention.
- FIG. 17 is a characteristic example of the relative delay quality degradation amount estimation.
- FIG. 18 shows video communication quality estimations related to the fourth embodiment of the present invention. It is explanatory drawing which shows the structure of the principal part of a fixed apparatus.
- FIG. 19 is a flowchart showing a delay quality degradation amount estimation process of the video communication quality estimation apparatus according to the fourth embodiment of the present invention.
- FIG. 20 is a characteristic example of estimation of the relative delay quality degradation amount.
- FIG. 21 is a characteristic example of slope coefficient estimation.
- Fig. 22 is an explanatory diagram showing a configuration of a main part of a video communication quality estimation apparatus according to the fifth embodiment of the present invention.
- FIG. 23 is a flowchart showing delay quality degradation amount estimation processing of the video communication quality estimation apparatus according to the fifth embodiment of the present invention.
- FIG. 24 is a characteristic example of estimation of the relative delay quality degradation amount.
- FIG. 25 is a characteristic example of slope coefficient estimation.
- FIG. 26 is a characteristic example of the absolute delay quality degradation amount estimation model used in the video communication quality estimation apparatus according to the sixth embodiment of the present invention.
- FIG. 27 is a characteristic example of a relative delay quality degradation amount estimation model used in the video communication quality estimation device according to the seventh embodiment of the present invention.
- FIG. 28 is another characteristic example of the relative delay quality degradation amount estimation model used in the video communication quality estimation apparatus according to the seventh embodiment of the present invention.
- FIG. 29 is another characteristic example of the relative delay quality degradation amount estimation model used in the video communication quality estimation apparatus according to the seventh embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration of a video communication quality estimation apparatus according to the first embodiment of the present invention.
- the video communication quality estimation device 1 has the power of an information processing device that computes and outputs input information, and combines both audio media and video media between communication terminals connected via a network. Related to video communication Estimate quality.
- the video communication quality estimation apparatus 1 includes a multimodal quality estimation unit 11, a delay quality degradation amount estimation unit 12, and a video communication quality estimation unit 13 as main functional units.
- the multimodal quality estimation unit 11 uses the audio quality evaluation value 21A, which is a quality evaluation value for the audio media output from the communication terminal, and the quality evaluation for the video media output from the communication terminal. Based on the video quality evaluation value 21B, which is a value, the multimodal quality value 23A, which is the quality evaluation value of the composite media in which audio media and video media are combined, is estimated.
- the delay quality degradation amount estimation unit 12 receives the audio delay time 22A, which is the delay time until the audio media is input and output between the communication terminals, and the video media are input between the communication terminals. Based on the video delay time 22B, which is the delay time until output, the delay quality degradation amount 23B caused by the delay between the audio media and the video media is estimated.
- the video communication quality estimation unit 13 Based on the multimodal quality value 23A estimated by the multimodal quality estimation unit 11 1 and the delay quality degradation amount 23B estimated by the delay quality degradation amount estimation unit 12, the video communication quality estimation unit 13 The quality value 24 is estimated.
- each functional unit of the video communication quality estimation device 1 will be described in detail.
- the multimodal quality estimator 11 includes an audio quality evaluation value 21A, which is a quality evaluation value for audio media output from the communication terminal, and a video quality evaluation value, which is a quality evaluation value for the video media output from the communication terminal. Based on 21B, it has a function to estimate the multimodal quality value 23A, which is the quality evaluation value of composite media that combines audio and video media.
- the multimodal quality estimation unit 11 is provided with a storage unit 11A and a multimodal quality calculation unit 11B as main functional means.
- the storage unit 11A has a function of storing in advance a multimodal quality estimation model 31 indicating the relationship between the audio quality evaluation value 21A, the video quality evaluation value 21B, and the multimodal quality value 23A.
- the multimodal quality calculation unit 11B has a function of calculating a multimodal quality value 23A corresponding to the audio quality evaluation value 21A and the video quality evaluation value 21B based on the multimodal quality estimation model 31 of the storage unit 11A.
- the voice quality evaluation value 21A is a user experience that the user feels with respect to the reproduced audio media when the audio media transmitted also with one communication terminal power is received and reproduced with the other communication terminal.
- the video quality evaluation value 21B is a user experience quality that the user feels for the played back video media when the video media transmitted from one communication terminal is received and played back by the other communication terminal. It is.
- the delay quality degradation amount estimation unit 12 determines the delay time until the audio media is input between the communication terminals and output until the audio media is input and output between the communication terminals. Based on the video delay time 22B, which is the delay time, it has a function to estimate the delay quality degradation amount 23B caused by the delay between the audio media and the video media.
- the delay quality degradation amount estimation unit 12 is provided with a storage unit 12A and a delay quality degradation amount calculation unit 12B as main functional means.
- the storage unit 12A has a function of storing in advance a delay quality degradation amount estimation model 32 indicating the relationship between the audio delay time 22A and the video delay time 22B and the delay quality degradation amount 23B.
- Delay quality degradation amount calculation unit 12B Based on the delay quality degradation amount estimation model 32 of the storage unit 12A, it has a function of calculating the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B.
- the audio delay time 22A is a time when audio media is input from one communication terminal and the other communication This is the delay time until it is output at the communication terminal.
- the video delay time 22B is a delay time from when the video media is input at one communication terminal to when it is output at the other communication terminal.
- Specific delay times constituting the audio delay time 22A and the video delay time 22B include processing time when transmitting audio media and video media signals, network delay time, and further audio media and video media signals.
- the processing time at the time of audio media and video media signal transmission includes the encoding time and transmission buffer time of the audio media and video media.
- the delay time in the network includes the processing time of the routers that make up the network and the physical distance of the network between communicators.
- the processing time when receiving audio media and video media signals includes reception buffer time and decoding time of audio media and video media.
- a delay quality degradation amount estimation model 32 indicating the relationship between the audio delay time 22A and the video delay time 22B and the delay quality degradation amount 23B is derived in advance by a test and stored in the storage unit 12A.
- the delay quality degradation amount estimation unit 12 performs the delay quality degradation amount 23B corresponding to the newly measured audio delay time 22A and video delay time 22B based on the delay quality degradation amount estimation model 32 of the storage unit 12A. Is calculated.
- the video communication quality estimation unit 13 takes into account the interaction between the multimodal quality value 23A estimated by the multimodal quality estimation unit 11 and the delay quality degradation amount 23B estimated by the delay quality degradation amount estimation unit 12. It has a function to estimate the quality value 24 of video communication realized by the interactive multimodal service.
- the video communication quality estimation unit 13 includes a storage unit 13A and a video communication quality calculation unit 13B as main functional means.
- the storage unit 13A has a function of storing in advance a video communication quality estimation model 33 indicating the relationship between the multimodal quality value 23A, the delay quality degradation amount 23B, and the video communication quality value 24.
- the video communication quality calculation unit 13B is the video communication product of the storage unit 13A. Based on the quality estimation model 33, the video communication quality value 24 corresponding to the multimodal quality value 23A and the delay quality degradation amount 23B is calculated.
- the storage unit for various arithmetic processing data and programs is also configured with a storage device such as a memory and a hard disk.
- An arithmetic processing unit (computer) that performs various arithmetic processes is composed of a CPU and its peripheral circuits. By reading and executing a program (not shown) of the storage unit, the hardware and program To realize various functional means.
- the storage unit and the arithmetic processing unit of each functional unit may be provided individually for each functional unit or may be shared by each functional unit.
- FIG. 2 is a flowchart showing the overall processing operation of the video communication quality estimation apparatus according to the first embodiment of the present invention.
- audio quality evaluation value 21A, video quality evaluation value 21B, audio delay time 22A, and video delay time 22B are external devices
- a case will be described in which a quality value related to the video communication is estimated based on the quality information on the assumption that it is input from a recording medium, a communication network, or a keyboard (not shown).
- the video communication quality estimation device 1 starts the entire process of Fig. 2 triggered by an operator operation indicating the input of quality information or the start of execution.
- the video communication quality estimation device 1 performs a multimodal quality estimation step by the multimodal quality estimation unit 11, thereby performing multimodal quality corresponding to the audio quality evaluation value 21A and the video quality evaluation value 21B. Estimate the value 23A (step 100).
- the video communication quality estimation device 1 estimates the delay quality degradation amount.
- the unit 12 estimates the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B by executing the delay quality degradation amount estimation step (step 110).
- the video communication quality estimation apparatus 1 executes the video communication quality estimation step by the video communication quality estimation unit 13, thereby performing video communication corresponding to the multimodal quality value 23A and the delay quality degradation amount 23B.
- the quality value 24 is estimated (step 120), and the whole series of processing operations ends.
- the multimodal quality estimation step and the delay quality degradation amount estimation step may be executed in parallel as described above, or the steps may be executed in order.
- FIG. 3 is a flowchart showing the multimodal quality estimation process of the video communication quality estimation apparatus according to the first embodiment of the present invention.
- the multimodal quality estimation unit 11 of the video communication quality estimation apparatus 1 executes the multimodal quality estimation process of FIG. 3 in the multimodal quality estimation step of step 100 of FIG.
- the multimodal quality estimation unit 11 acquires the audio quality evaluation value 21A and the video quality evaluation value 21B input from the external force by the multimodal quality calculation unit 11B (step 101).
- the multimodal quality calculation unit 11B reads out the model coefficient indicating the storage unit 11A force multimodal quality estimation model 31 (step 102), and based on this multimodal quality estimation model 31, the speech quality evaluation value 21A And a multimodal quality value 23A corresponding to the video quality evaluation value 21B is calculated (step 103).
- FIG. 4 is a characteristic example of the multimodal quality estimation model.
- the quality in the case where quality degradation due to delay of video media and audio media is not taken into consideration is multi-valued.
- the modal quality value is 23A.
- the multimodal quality value 23A has a constant voice quality evaluation value MOSa. If the video quality evaluation value MOSv is increased, it increases monotonously. If the video quality evaluation value MOSv is constant, the audio quality evaluation value MOSa tends to increase monotonously.
- the multimodal quality value 23A can be expressed by a mathematical expression indicating the interaction between the audio quality evaluation value 21A and the video quality evaluation value 21B. If the audio quality evaluation value 21A is MOSa, the video quality evaluation value 21B is MOSv, ⁇ , ⁇ 1, y1, ⁇ 1 are constants, and the multimodal quality value 23 ⁇ is MOSmm, MOSmm is (1).
- MOSmm al ⁇ MOSa + ⁇ ⁇ MOSv + ⁇ 1 ⁇ MOSa-MOSv + ⁇
- MOSmm MoSmm Can be normalized by the following equation (2).
- the multimodal quality calculation unit 11B outputs the calculated multimodal quality value 23A to the video communication quality estimation unit 13 (step 104), and ends a series of multimodal quality estimation processes.
- FIG. 5 is a flowchart showing a delay quality degradation amount estimation process of the video communication quality estimation apparatus according to the first embodiment of the present invention.
- the delay quality degradation amount estimation unit 12 of the video communication quality estimation apparatus 1 performs the delay quality degradation amount estimation in FIG. 5 in the delay quality degradation amount estimation step in step 110 in FIG. Perform regular processing.
- the delay quality degradation amount estimation unit 12 acquires the audio delay time 22A and the video delay time 22B input from the outside by the delay quality degradation amount calculation unit 12B (step 111).
- the delay quality degradation amount calculation unit 12B reads the model coefficient indicating the delay quality degradation amount estimation model 32 from the storage unit 12A (step 112), and based on the delay quality degradation amount estimation model 32, the voice delay time 22A and A delay quality degradation amount 23B corresponding to the video delay time 22B is calculated (step 113).
- FIG. 6 is a characteristic example of the delay quality degradation amount estimation model.
- the quality degradation amount due to delay of video media and audio media is referred to as delay quality degradation amount 23B.
- the delay quality degradation amount Dav increases monotonously with the increase of the video delay time Dv to reach a predetermined maximum value, and further increases the video delay time Dv. It has a convex characteristic that monotonously decreases with an increase.
- the delay quality degradation amount Dav monotonously increases as the audio delay time Da increases to reach a predetermined maximum value, and monotonously as the audio delay time Da increases further.
- the delay quality degradation amount 23B can be expressed by a functional expression in which the audio delay time 22A and the video delay time 22B are variables.
- the audio delay time 22A is Da
- the video delay time 22B is Dv
- the function expression indicating the correspondence between the audio delay time 22A and the video delay time 22B and the delay quality degradation amount 23B is f (Da, Dv), a
- the function that selects the smallest value of b is min (a, b)
- the function that selects the larger value of a and b is max (a, b)
- the delay quality degradation amount 23B is
- Dav normalized to the MOS value range 1 to 5 can be estimated by the following equation (3).
- the delay quality degradation amount calculation unit 12B uses the calculated delay quality degradation amount 23 ⁇ as a video communication.
- the data is output to the case quality estimation unit 13 (step 114), and the series of delay quality deterioration amount estimation processing ends.
- FIG. 7 is a flowchart showing the video communication quality estimation process of the video communication quality estimation apparatus according to the first embodiment of the present invention.
- the video communication quality estimation unit 13 of the video communication quality estimation device 1 executes the video communication quality estimation process of FIG. 7 in the video communication quality estimation step in step 120 of FIG.
- the video communication quality estimation unit 13 uses the video communication quality calculation unit 13B to determine the multimodal quality value 23 A estimated by the multimodal quality estimation unit 11 and the delay estimated by the delay quality degradation amount estimation unit 12. Acquire quality degradation amount 23B (step 121).
- the video communication quality calculation unit 13B reads the model coefficient indicating the video communication quality estimation model 33 from the storage unit 13A (step 122), and based on the video communication quality estimation model 33, the multimodal quality value is read.
- Video communication quality value 24 corresponding to 23A and delay quality degradation amount 23B is calculated (step 123).
- FIG. 8 is a characteristic example of the video communication quality estimation model.
- the quality considering the amount of quality degradation due to delay of video media and audio media is used for video communication.
- the quality value is 24.
- the video communication quality value MOSall decreases monotonously as the delay quality degradation amount Dav increases when the multimodal quality value MOSmm is constant, and when the delay quality degradation amount Dav remains constant. Multimodal quality value tends to increase monotonically as MOSmm increases.
- the video communication quality value 24 can be expressed by a mathematical expression indicating the interaction between the multimodal quality value 23A and the delayed quality degradation amount 23B.
- Multimodal product When quality value 23A is MOSmm, delay quality inferiority quantity 23B is Dav, a2, ⁇ 2, ⁇ 2, ⁇ 2 are constants, and video communication quality value 24 is MOSall, MOSall is given by It can be estimated by (4).
- MOSall ⁇ 2 ⁇ MOSmm + ⁇ 2 ⁇ Dav + ⁇ 2 ⁇ MOSmm- Dav + 62...
- a normalization process is performed for the video communication quality value 24 to indicate a standard MOS value that takes a numerical value of 1 to 5.
- MOSall It can be normalized by equation (5).
- the video communication quality calculation unit 13B outputs the calculated video communication quality value 24 to the outside of the apparatus, a recording medium, a communication network, a storage unit, or a display screen (not shown) (step 124). ), A series of video communication quality estimation processing ends.
- the multimodal quality estimation unit 11 estimates the multimodal quality value 23A based on the audio quality evaluation value 21A and the video quality evaluation value 21B, and estimates the delay quality degradation amount.
- Unit 12 estimates delay quality degradation amount 23B based on audio delay time 22A and video delay time 22B, and video communication quality estimation unit 13 estimates video based on multimodal quality value 23A and delay quality degradation amount 23B. Since the communication quality value 24 is estimated, the quality evaluation value of individual media for audio media and video media and the video communication quality value 24 considering quality degradation due to delay of audio media and video media are estimated.
- the quality of video communication which is a two-way exchange of audio and video media, is sufficient. It can be estimated in degrees.
- the audio delay time and the video delay time The delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B is estimated based on the delay quality degradation amount estimation model 32 that shows the relationship with the delay quality degradation amount.
- the amount of quality degradation 23B can be estimated.
- FIG. 9 is a graph showing the estimation result of the video communication quality estimation value obtained in the present embodiment.
- the horizontal axis represents the video communication quality estimate (MOS value) obtained in this embodiment, and the vertical axis represents the result of actual opinion evaluation for each video communication target to be estimated.
- a certain video communication quality measurement (MOS value) is shown.
- the estimated video communication quality value and the actual measurement value obtained in this embodiment are plotted on the diagonal line of the graph.
- the coefficient of determination is 0.91, indicating that a high correlation is obtained.
- the average value of the 95% confidence interval of the measured value is 0.31
- the estimated root mean square error (RMSE) is 0.16, which is a practically sufficient estimate. The fact that it has accuracy is remarkable.
- the delay quality degradation amount estimation model 32 when the audio delay time Da is constant, the delay quality degradation amount Dav monotonously increases with the increase of the video delay time Dv and reaches a predetermined maximum value.
- the delay quality degradation amount Dav increases monotonously according to the increase of the audio delay time Da, and is predetermined.
- the convex characteristic that monotonously decreases as the audio delay time Da further increases is used, so that it depends on human visual and auditory characteristics related to quality degradation due to delays in audio and video media. The amount of quality degradation can be estimated accurately and easily.
- FIG. 10 is an explanatory diagram showing the configuration of the main part of the video communication quality estimation apparatus according to the second embodiment of the present invention.
- the delay quality degradation amount estimation unit 12 estimates the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B
- the audio delay time Delay quality degradation amount estimation model showing the relationship between video delay time and delay quality degradation amount
- the absolute delay quality degradation amount indicating the quality degradation due to the absolute delay between the audio media and the video media from the audio delay time 22A and the video delay time 22B, the absolute delay quality degradation amount indicating the quality degradation due to the absolute delay between the audio media and the video media, and the relative relationship between the audio media and the video media.
- An example will be described in which a relative delay quality degradation amount indicating quality degradation due to a typical delay is obtained and the delay quality degradation amount 23 B is indirectly estimated from the absolute delay quality degradation amount and the relative delay quality degradation amount.
- the delay quality degradation amount estimation unit 12 has a storage unit as a main functional means.
- a delay quality degradation amount calculation unit 12B a delay quality degradation amount calculation unit 12B, an absolute delay quality degradation amount calculation unit 12C, and a relative delay quality degradation amount calculation unit 12D are provided.
- the storage unit 12A includes an absolute delay quality degradation amount estimation model 32A indicating the relationship between the delay time sum of the audio delay time 22A and the video delay time 22B and the absolute delay quality degradation amount 26, and the audio delay time 22A and the video delay. And a relative delay quality degradation amount estimation model 32B showing a relationship between the delay time difference from the time 22B and the relative delay quality degradation amount 27.
- the absolute delay quality degradation amount calculation unit 12C calculates the absolute delay quality degradation amount corresponding to the delay time sum of the audio delay time 22A and the video delay time 22B. It has a function to calculate.
- the relative delay quality degradation amount calculation unit 12D Based on the relative delay quality degradation amount estimation model 32B in the storage unit 12A, the relative delay quality degradation amount calculation unit 12D performs relative delay quality degradation corresponding to the delay time difference between the audio delay time 22A and the video delay time 22B. It has a function to calculate the quantity 27.
- the delay quality degradation amount calculation unit 12B includes the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount 27 calculated by the relative delay quality degradation amount calculation unit 12D. Based on audio delay time 22A and video delay time 22B It has a function to calculate the delay quality degradation amount 23B.
- the absolute delay quality degradation amount is a quality degradation amount caused by the absolute delay between the audio media and the video media.
- the relative delay quality degradation amount is a quality degradation amount caused by a relative delay difference between the audio media and the video media.
- the absolute delay quality degradation amount 26 is defined as the absolute delay quality degradation amount 26, and the absolute delay quality degradation amount monotonously increases as the delay time sum of the audio delay time and the video delay time increases.
- the absolute delay quality degradation amount calculation unit 12C estimates the absolute delay quality degradation amount 26.
- the relative delay that occurs between the communication terminals is defined as a relative delay quality degradation amount 27, and the relative delay quality degradation amount monotonously increases as the delay time difference between the audio delay time and the video delay time increases.
- the relative delay quality degradation amount 27 is estimated.
- the storage unit for various arithmetic processing data and programs is also configured with a storage device such as a memory and a hard disk.
- An arithmetic processing unit (computer) that performs various arithmetic processes is composed of a CPU and its peripheral circuits. By reading and executing a program (not shown) of the storage unit, the hardware and program To realize various functional means.
- the storage unit and the arithmetic processing unit of each functional unit may be provided individually for each functional unit or may be shared by each functional unit.
- FIG. 11 is a flowchart showing the delay quality degradation amount estimation processing of the video communication quality estimation apparatus according to the second embodiment of the present invention. Note that the operation of the video communication quality estimation apparatus 1 that contributes to the present embodiment differs from the first embodiment only in the delay quality degradation amount estimation operation. Other processing operations are the same as those in the first embodiment, and a detailed description thereof is omitted here.
- the delay quality degradation amount estimation unit 12 of the video communication quality estimation device 1 executes the delay quality degradation amount estimation process of FIG. 11 in the delay quality degradation amount estimation step of step 110 of FIG.
- the delay quality degradation amount estimation unit 12 acquires the audio delay time 22A and the video delay time 22B input from the outside by the delay quality degradation amount calculation unit 12B (step 211).
- the delay quality degradation amount estimation unit 12 reads the model coefficient indicating the absolute delay quality degradation amount estimation model 32A from the storage unit 12A by the absolute delay quality degradation amount calculation unit 12C (step 212).
- an absolute delay quality degradation amount 26 corresponding to the delay time sum of the audio delay time 22A and the video delay time 22B is calculated (step 213).
- FIG. 12 is a characteristic example of the absolute delay quality degradation amount estimation.
- quality degradation components that change according to the sum of the delay times of the audio delay time 22A and the video delay time 22B out of the quality related to video communication in which audio media and video media are exchanged bidirectionally are combined.
- the amount of absolute delay quality degradation is 26.
- the absolute delay quality degradation amount 26 tends to monotonously increase as the delay time sum Dr of the audio delay time Da and the video delay time Dv increases.
- the absolute delay quality degradation amount 26 can be expressed by a linear function expression using, for example, the delay time sum of the audio delay time 22A and the video delay time 22B as a variable. If audio delay time 2 2A is Da, video delay time 22B is Dv, and sum of delay times is Dr, Dr is obtained by the following equation (6).
- Dr Da + Dv '(6) [0081] Further, when ⁇ 3,
- R (Dr) can be estimated by the following equation (7).
- the delay quality degradation amount estimation unit 12 reads the model coefficient indicating the relative delay quality degradation amount estimation model 32 ⁇ from the storage unit 12A by the relative delay quality degradation amount calculation unit 12D (step 214). Based on the delay quality degradation amount estimation model 32 ⁇ , a relative delay quality degradation amount 27 corresponding to the delay time difference between the audio delay time 22 ⁇ and the video delay time 22 ⁇ is calculated (step 215).
- FIG. 13 is a characteristic example of relative delay quality degradation amount estimation.
- quality degradation components that change in accordance with the delay time difference between audio delay time 22 mm and video delay time 22 mm are relative to each other.
- the amount of delay quality degradation is 27.
- the relative delay quality degradation amount 27 shows zero until the delay time difference Ds between the audio delay time Da and the video delay time Dv reaches a predetermined value, and decreases monotonously as the delay time difference Ds further increases. Tend to.
- the relative delay quality degradation amount 27 can be expressed by a linear function expression using, for example, the delay time difference between the audio delay time 22A and the video delay time 22B as a variable. If the audio delay time 22A is Da, the video delay time 22B is Dv, and the delay time difference is Ds, Ds can be calculated by the following equation (8).
- the delay quality degradation amount estimation unit 12 uses the delay quality degradation amount calculation unit 12B to calculate the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount calculation unit. Based on the relative delay quality degradation amount 27 calculated in 12D, the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B is calculated (step 216).
- FIG. 14 is a characteristic example of delay quality degradation amount estimation. As shown in FIG. 14, the delay quality degradation amount 23B tends to monotonously increase as the sum of the absolute delay quality degradation amount R (Dr) and the relative delay quality degradation amount S (Ds) increases.
- the delay quality degradation amount 23B can be expressed, for example, by the sum of the absolute delay quality degradation amount R (Dr) and the relative delay quality degradation amount S (Ds).
- the absolute delay quality degradation amount 26 is R (Dr)
- the delay quality degradation amount 23B is Dav
- the function that selects the smaller one of a and b is min (a, b)
- the function that selects the larger value is max (a, b)
- Dav normalized to the MOS value range 1 to 5 is obtained by the following equation (10).
- Dav min [5, max ⁇ i? (L) r I + 5 ( ⁇ ) 5), ⁇ ]... hi. )
- the delay quality degradation amount calculation unit 12B outputs the calculated delay quality degradation amount 23 ⁇ to the video communication quality estimation unit 13 (step 217), and ends the series of delay quality degradation amount estimation processing. To do.
- the audio delay time is calculated by the absolute delay quality degradation amount calculation unit 12C.
- the absolute delay quality degradation corresponding to the sum of the delay time of the audio delay time and the video delay time based on the absolute delay quality degradation characteristic that the absolute delay quality degradation amount monotonously increases as the delay time sum of the video delay time increases. Since the amount is estimated, the absolute delay quality degradation amount considering the human perceptual characteristic that the degradation of video communication quality is felt due to the absolute delay from the input to the output of each media is simplified. Can be estimated with high accuracy.
- the relative delay quality degradation amount calculation unit 12D causes the relative delay quality degradation amount in which the relative delay quality degradation amount monotonously decreases as the delay time difference between the audio delay time and the video delay time increases. Since the absolute delay quality degradation amount corresponding to the delay time difference between the audio delay time and the video delay time is estimated based on the characteristics, the video communication is caused by the relative delay time between media, that is, the loss of synchronization. It is possible to accurately estimate the amount of relative delay quality degradation that takes into account human perception characteristics of feeling quality degradation with simple processing.
- FIG. 15 is an explanatory diagram showing the configuration of the main part of the video communication quality estimation device according to the third embodiment of the present invention.
- This embodiment is based on the magnitude relationship between the audio delay time 22A and the video delay time 22B.
- the delay quality degradation amount estimation unit 12 includes, as main functional means, a storage unit 12A, a delay quality degradation amount calculation unit 12B, an absolute delay quality degradation amount calculation unit 12C, and a relative delay quality degradation amount.
- a calculation unit 12D is provided.
- the storage unit 12A includes an absolute delay quality degradation amount estimation model 32A showing the relationship between the delay time sum of the audio delay time 22A and the video delay time 22B and the absolute delay quality degradation amount 26, and the audio delay time 22A and the video delay time 22B. It has a function of storing a plurality of different relative delay quality degradation amount estimation models 32B and 32C according to the magnitude relationship in advance.
- the absolute delay quality degradation amount calculation unit 12C calculates the absolute delay quality corresponding to the sum of the delay times of the audio delay time 22A and the video delay time 22B based on the absolute delay quality degradation amount estimation model 32A of the storage unit 12A. It has a function to calculate the amount of deterioration 26.
- the relative delay quality degradation amount calculation unit 12D has a function to select a relative delay quality degradation amount estimation model from the storage unit 12A according to the magnitude relationship between the audio delay time 22A and the video delay time 22B, and the selected relative delay quality degradation amount estimation. Based on the model, it has a function of calculating the relative delay quality degradation amount 27 corresponding to the delay time difference between the audio delay time 22A and the video delay time 22B.
- the delay quality degradation amount calculation unit 12B includes the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount calculated by the relative delay quality degradation amount calculation unit 12D. 27, the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B is calculated.
- a relative delay quality degradation amount estimation model is selected according to the magnitude relationship between the audio delay time and the video delay time, and based on the selected relative delay quality degradation amount estimation model.
- the relative delay quality degradation amount calculation unit 12D estimates the relative delay quality degradation amount 27.
- the storage unit for various arithmetic processing data and programs is also configured with a storage device such as a memory and a hard disk.
- An arithmetic processing unit (computer) that performs various arithmetic processes is composed of a CPU and its peripheral circuits. By reading and executing a program (not shown) of the storage unit, the hardware and program To realize various functional means.
- the storage unit and the arithmetic processing unit of each functional unit may be provided individually for each functional unit or may be shared by each functional unit.
- FIG. 16 is a flowchart showing the delay quality degradation amount estimation process of the video communication quality estimation apparatus according to the third embodiment of the present invention. Note that the operation of the video communication quality estimation apparatus 1 that contributes to the present embodiment differs from the second embodiment only in the delay quality degradation amount estimation operation. Other processing operations are the same as those in the second embodiment, and a detailed description thereof is omitted here.
- the delay quality degradation amount estimation unit 12 of the video communication quality estimation apparatus 1 executes the delay quality degradation amount estimation process in FIG. 16 in the delay quality degradation amount estimation step in step 110 in FIG.
- the delay quality degradation amount estimation unit 12 obtains the audio delay time 22A and the video delay time 22B input from the outside by the delay quality degradation amount calculation unit 12B (step 311).
- the delay quality degradation amount estimation unit 12 reads the model coefficient indicating the absolute delay quality degradation amount estimation model 32A from the storage unit 12A by the absolute delay quality degradation amount calculation unit 12C (step 312).
- an absolute delay quality degradation amount 26 corresponding to the delay time sum of the audio delay time 22A and the video delay time 22B is calculated (step 313).
- the delay quality degradation amount estimation unit 12 uses the relative delay quality degradation amount calculation unit 12D to A relative delay quality degradation estimation model is selected according to the magnitude relationship between the voice delay time 22A and the video delay time 22B (step 314). Then, the model coefficient indicating the selected relative delay quality degradation amount estimation model is read from the storage unit 12A (step 315), and based on this relative delay quality degradation amount estimation model, the audio delay time 22A and the video delay time 22B are delayed. Relative delay quality degradation amount 27 corresponding to the time difference is calculated (step 316).
- FIG. 17 is a characteristic example of relative delay quality degradation amount estimation.
- the relative delay quality degradation characteristic perceived by the user is related to the magnitude relationship between the audio delay time 22A and the video delay time 22B.
- the audio delay time 22A is greater or smaller than the video delay time 22B.
- Two relative delay quality degradation amount estimation models 32 B and 32 C are stored in advance in the storage unit 12 A according to the sign of the delay time difference Ds.
- the relative delay quality degradation amount estimation model 32B is applied when the audio delay time 22A is greater than or equal to the video delay time 22B, and the relative delay quality degradation amount estimation model 32C has an audio delay time 22A of video delay. Applicable when the time is less than 22B.
- the relative delay quality degradation amount 27 is the delay time difference Ds between the audio delay time Da and the video delay time Dv being a predetermined value. It shows zero until the value is reached, and tends to monotonously decrease as the delay time difference Ds further increases.
- the relative delay quality degradation amount 27 indicates zero until the delay time difference D s between the audio delay time Da and the video delay time Dv reaches a predetermined value. There is a tendency to monotonously decrease with further decrease in Ds.
- the delay quality degradation amount estimation unit 12 uses the delay quality degradation amount calculation unit 12B to calculate the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount calculation unit. Based on the relative delay quality degradation amount 27 calculated in 12D, the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B is calculated (step 317). This step 317 is the same as step 216 of FIG. 11 described above, and detailed description thereof is omitted here.
- the delay quality degradation amount calculation unit 12B outputs the calculated delay quality degradation amount 23B to the video communication quality estimation unit 13 (step 318), and ends a series of delay quality degradation amount estimation processing.
- a plurality of relative delay quality degradation amount estimation models 32B and 32C corresponding to the magnitude relationship between the audio delay time 22A and the video delay time 22B are stored in the storage unit 12A.
- the delay quality degradation amount calculation unit 12D selects a relative delay quality degradation amount estimation model according to the magnitude relationship between the audio delay time 22A and the video delay time 22B, and based on the selected relative delay quality degradation amount estimation model, Since the relative delay quality degradation amount 27 corresponding to the delay time difference between the delay time 22A and the video delay time 22B is calculated, the degree to which the relative delay quality degradation is felt depends on the relationship between the audio delay time and the video delay time. It is possible to accurately estimate the amount of relative delay quality degradation that takes into account human perception characteristics of changes with simple processing.
- FIG. 18 is an explanatory diagram showing the configuration of the main part of the video communication quality estimation apparatus according to the fourth embodiment of the present invention, where the same reference numerals are given to the same or equivalent parts as in FIG. .
- the video media frame rate 22C is used, and the relative delay quality corresponding to the audio delay time 22A, the video delay time 22B, and the frame rate 22C is used.
- the frame rate is the transfer rate of the frames constituting the video media and is represented by the number of frames transmitted per unit time.
- the configuration of the video communication quality estimation device 1 that works in the present embodiment is different from that of the second embodiment (see FIG. 10) in that the storage unit 12A of the delay quality degradation amount estimation unit 12 Only the relative delay quality degradation amount calculation unit 12D is different, and the slope coefficient calculation unit 12E is newly added.
- Other configurations are the same as those in the second embodiment, and a detailed description thereof is omitted here.
- the delay quality degradation amount estimation unit 12 includes, as main functional means, a storage unit 12A, a delay quality degradation amount calculation unit 12B, an absolute delay quality degradation amount calculation unit 12C, and a relative delay quality degradation amount calculation.
- a section 12D and an inclination coefficient calculation section 12E are provided.
- the storage unit 12A includes an absolute delay quality degradation amount estimation model 32A indicating the relationship between the delay time sum of the audio delay time 22A and the video delay time 22B and the absolute delay quality degradation amount 26, and the audio delay time 22A and the video delay.
- the relationship between the delay time difference from time 22B and the relative delay quality degradation amount 27 A function for preliminarily storing a relative delay quality degradation amount estimation model 32B shown in FIG. 5 and a slope coefficient estimation model 32D showing a relationship between a frame rate 22C and a slope coefficient showing the slope of the relative delay quality degradation amount estimation model 32B. is doing.
- the absolute delay quality degradation amount calculation unit 12C calculates the absolute delay quality corresponding to the sum of the delay times of the audio delay time 22A and the video delay time 22B. It has a function to calculate the amount of deterioration 26.
- the inclination coefficient calculation unit 12E has a function of calculating an inclination coefficient indicating the inclination of the relative delay quality degradation amount estimation model 32B based on the inclination coefficient estimation model 32D of the storage unit 12A.
- Relative delay quality degradation amount calculation unit 12D identifies the slope of the relative delay quality degradation amount estimation model 32B of storage unit 12A based on the slope coefficient calculated by slope coefficient calculation unit 12E and the slope. Based on the relative delay quality degradation amount estimation model 32B, a function of calculating the relative delay quality degradation amount 27 corresponding to the delay time difference between the audio delay time 22A and the video delay time 22B is provided.
- the delay quality degradation amount calculation unit 12B includes the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount 27 calculated by the relative delay quality degradation amount calculation unit 12D. Based on this, it has a function of calculating the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B.
- the degree of relative delay quality degradation depends on the frame rate of the video media. For example, when the frame rate is low, even if there is a relative deviation between the audio media and the video media, no significant quality degradation is perceived, but as the frame rate increases, the quality degradation becomes significant. Also, as seen in videophone services using mobile phones in recent years, a frame rate of 30 [frame / sec] cannot be realized! /, There are many systems, and the frame rate changes It is a very important issue to consider comprehensive multimodal quality in consideration.
- the relative delay quality degradation amount calculation unit 12D uses a linear function as the relative delay quality degradation amount estimation model 32B, and the slope coefficient of this linear function is a logarithmic function as the frame rate increases. Characteristic, that is, the slope coefficient estimation model Based on 32D, the slope coefficient calculation unit 12E calculates the slope coefficient of the linear function corresponding to the frame rate. Thereby, it is possible to estimate the relative delay quality deterioration amount of the video communication in consideration of the change of the frame rate.
- the storage unit for various arithmetic processing data and programs is also configured with a storage device such as a memory and a hard disk.
- An arithmetic processing unit (computer) that performs various arithmetic processes is composed of a CPU and its peripheral circuits. By reading and executing a program (not shown) of the storage unit, the hardware and program To realize various functional means.
- the storage unit and the arithmetic processing unit of each functional unit may be provided individually for each functional unit or may be shared by each functional unit.
- FIG. 19 is a flowchart showing the delay quality degradation amount estimation processing of the video communication quality estimation apparatus according to the fourth embodiment of the present invention. Note that the operation of the video communication quality estimation apparatus 1 that contributes to the present embodiment differs from the second embodiment only in the delay quality degradation amount estimation operation. Other processing operations are the same as those in the second embodiment, and a detailed description thereof is omitted here.
- the delay quality degradation amount estimation unit 12 of the video communication quality estimation device 1 executes the delay quality degradation amount estimation process of FIG. 19 in the delay quality degradation amount estimation step of step 110 of FIG.
- the delay quality degradation amount estimation unit 12 obtains the audio delay time 22A, the video delay time 22B, and the frame rate 22C input from the outside by the delay quality degradation amount calculation unit 12B (step 411).
- the delay quality degradation amount estimation unit 12 reads out the model coefficient indicating the absolute delay quality degradation amount estimation model 32A from the storage unit 12A by the absolute delay quality degradation amount calculation unit 12C (step 412).
- an absolute delay quality degradation amount 26 corresponding to the delay time sum of the audio delay time 22A and the video delay time 22B is calculated (step 413).
- the delay quality degradation amount estimation unit 12 reads out the model coefficient indicating the gradient coefficient estimation model 32D from the storage unit 12A by the gradient coefficient calculation unit 12E (step 414), and based on the gradient coefficient estimation model 32D. Accordingly, a slope coefficient indicating the slope of the relative delay quality degradation amount estimation model 32B is calculated (step 415).
- Fig. 20 shows an example of the characteristics of the relative delay quality degradation estimation.
- the relative delay quality degradation amount 27 shows zero until the delay time difference Ds between the audio delay time Da and the video delay time Dv reaches a predetermined value, and monotonously increases as the delay time difference Ds further increases. There is a tendency to decrease.
- the slope ⁇ 4 of the relative delay quality degradation amount estimation model 32B tends to be gentle as the frame rate 22C decreases.
- Fig. 21 shows an example of the characteristics of slope coefficient estimation. As shown in Fig. 21, the slope ⁇ 4 of the relative delay quality degradation estimation model 32 ⁇ tends to monotonously decrease as the logarithmic value of the frame rate 22C increases.
- the slope coefficient ⁇ 4 can be expressed by a linear function expression using, for example, a logarithmic value of the frame rate 22C as a variable. If the frame rate 22C is F, the logarithmic value is log (F), «41, ⁇ 41 are constants, and the relative delay quality degradation estimation model 32 ⁇ is the slope coefficient ⁇ 4, then ⁇ 4 is It is obtained by equation (13).
- the delay quality degradation amount estimation unit 12 reads the model coefficient indicating the relative delay quality degradation amount estimation model 32B from the storage unit 12A by the relative delay quality degradation amount calculation unit 12D (step 416).
- the slope of the relative delay quality degradation amount estimation model 32B is specified by including the slope coefficient a4 calculated by the slope coefficient calculation unit 12E in this model coefficient (step 417).
- a relative delay quality degradation amount 27 corresponding to the delay time difference between the audio delay time 22A and the video delay time 22B is calculated (step 418).
- the delay quality degradation amount estimation unit 12 uses the delay quality degradation amount calculation unit 12B to calculate the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount calculation unit.
- the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B is calculated (step 419).
- the delay quality degradation amount calculation unit 12B outputs the calculated delay quality degradation amount 23B to the video communication quality estimation unit 13 (step 420), and ends the series of delay quality degradation amount estimation processing.
- linear functions are used as the relative delay quality degradation amount estimation model 32B, and the slope coefficient calculation unit 12E causes the slope coefficient of the linear function to be logarithmized as the frame rate increases.
- the slope coefficient estimation model that increases functionally, the slope coefficient of the linear function corresponding to the frame rate is estimated, and based on the relative delay quality degradation amount estimation model 32B specified by this slope coefficient, speech Since the relative delay quality degradation amount 27 corresponding to the delay time difference between the delay time 22A and the video delay time 22B is calculated, the degree of feeling the relative delay quality degradation changes according to the frame rate of the video media. Relative delay quality degradation considering human perception characteristics can be accurately estimated with simple processing.
- FIG. 22 is an explanatory diagram showing the configuration of the main part of the video communication quality estimation apparatus according to the fifth embodiment of the present invention, where the same or equivalent parts as those in FIG. .
- one relative delay quality degradation estimation model that is a linear function force.
- the slope of 32B is specified by the slope coefficient that also calculates the frame rate 22C force of the video media, and it corresponds to the delay time difference between audio delay time 22A and video delay time 22B based on the specified relative delay quality degradation amount estimation model 32B As an example, the relative delay quality degradation amount of 27 is calculated. In the present embodiment, a case will be described in which the relative delay quality degradation amount estimation model used for estimating the relative delay quality degradation amount 27 is selected based on the magnitude relationship between the audio delay time 22A and the video delay time 22B.
- the configuration of the video communication quality estimation device 1 that works for this embodiment is different from that of the second embodiment (see FIG. 10) in the storage unit 12A of the delay quality degradation amount estimation unit 12. Only the relative delay quality degradation amount calculation unit 12D is different. Other configurations are the same as those in the fourth embodiment, and a detailed description thereof is omitted here.
- the delay quality degradation amount estimation unit 12 includes, as main functional means, a storage unit 12A, a delay quality degradation amount calculation unit 12B, an absolute delay quality degradation amount calculation unit 12C, and a relative delay quality degradation amount calculation.
- a section 12D and an inclination coefficient calculation section 12E are provided.
- the storage unit 12A includes an absolute delay quality degradation amount estimation model 32A indicating the relationship between the delay time sum of the audio delay time 22A and the video delay time 22B and the absolute delay quality degradation amount 26, and the audio delay time 22A and the video delay.
- an absolute delay quality degradation amount estimation model 32A indicating the relationship between the delay time sum of the audio delay time 22A and the video delay time 22B and the absolute delay quality degradation amount 26, and the audio delay time 22A and the video delay.
- the absolute delay quality degradation amount calculation unit 12C calculates the absolute delay quality corresponding to the sum of the delay times of the audio delay time 22A and the video delay time 22B based on the absolute delay quality degradation amount estimation model 32A of the storage unit 12A. It has a function to calculate the amount of deterioration 26.
- the slope coefficient calculation unit 12E is based on the function of selecting the slope coefficient estimation model corresponding to the magnitude relationship between the audio delay time 22A and the video delay time 22B from the storage part 12A and the selected slope coefficient estimation model 32D.
- Relative delay quality degradation estimation model It has a function to calculate the slope coefficient indicating the slope of 32B.
- the relative delay quality degradation amount calculation unit 12D has a function of selecting a relative delay quality degradation amount estimation model from the storage unit 12A according to the magnitude relationship between the audio delay time 22A and the video delay time 22B, and the selected relative delay quality. Function to calculate relative delay quality degradation amount 27 corresponding to the delay time difference between audio delay time 22A and video delay time 22B based on the degradation amount estimation model have.
- the delay quality degradation amount calculation unit 12B includes the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount 27 calculated by the relative delay quality degradation amount calculation unit 12D. Based on this, it has a function of calculating the delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B.
- an inclination coefficient estimation model and a relative delay quality degradation amount estimation model are selected according to the relationship between the audio delay time and the video delay time, respectively, and based on the selected inclination coefficient estimation model, Then, the inclination coefficient corresponding to the frame rate of the video media is calculated by the inclination coefficient calculation unit 12E, and the inclination of the selected relative delay quality degradation amount estimation model is specified by the inclination coefficient, and this relative delay quality degradation amount estimation model is determined. Therefore, the relative delay quality degradation amount 27 is estimated by the relative delay quality degradation amount calculation unit 12D.
- the storage unit for various arithmetic processing data and programs is also configured with a storage device such as a memory and a hard disk.
- An arithmetic processing unit (computer) that performs various arithmetic processes is composed of a CPU and its peripheral circuits. By reading and executing a program (not shown) of the storage unit, the hardware and program To realize various functional means.
- the storage unit and the arithmetic processing unit of each functional unit may be provided individually for each functional unit or may be shared by each functional unit.
- FIG. 23 is a flowchart showing delay quality deterioration amount estimation processing of the video communication quality estimation apparatus according to the fifth embodiment of the present invention. Note that this embodiment The operation of the powerful video communication quality estimation device 1 differs from the fourth embodiment only in the delay quality degradation amount estimation operation. Other processing operations are the same as those in the fourth embodiment, and a detailed description thereof is omitted here.
- the delay quality degradation amount estimation unit 12 of the video communication quality estimation device 1 executes the delay quality degradation amount estimation process of FIG. 23 in the delay quality degradation amount estimation step of step 110 of FIG.
- the delay quality degradation amount estimation unit 12 obtains the audio delay time 22A, the video delay time 22B, and the frame rate 22C input from the outside by the delay quality degradation amount calculation unit 12B (step 511).
- the delay quality degradation amount estimation unit 12 reads out the model coefficient indicating the absolute delay quality degradation amount estimation model 32A from the storage unit 12A by the absolute delay quality degradation amount calculation unit 12C (step 512).
- an absolute delay quality degradation amount 26 corresponding to the sum of the delay times of the audio delay time 22A and the video delay time 22B is calculated (step 513).
- the delay quality degradation amount estimation unit 12 selects the gradient coefficient estimation model according to the magnitude relationship between the audio delay time 22A and the video delay time 22B by the gradient coefficient calculation unit 12E (step 514). . Then, the model coefficient indicating the selected inclination coefficient estimation model 32D is also read out from the storage unit 12A force (step 515). Is calculated (step 516).
- FIG. 24 is a characteristic example of the relative delay quality degradation amount estimation.
- the relative delay quality degradation characteristic perceived by the user is related to the magnitude relationship between the audio delay time 22A and the video delay time 22B.
- the audio delay time 22A is larger or smaller than the video delay time 22B.
- two relative delay quality degradation amount estimation models 32B and 32C are stored in the storage unit 12A in advance according to the sign of the delay time difference Ds.
- the relative delay quality degradation amount estimation model 32B is applied when the audio delay time 22A is greater than or equal to the video delay time 22B
- the relative delay quality degradation amount estimation model 32C is applied to the audio delay time 22A. 2 Applicable when less than 2B.
- the relative delay quality degradation amount 27 shows zero until the delay time difference Ds between the audio delay time Da and the video delay time Dv reaches a predetermined value, and tends to monotonously decrease as the delay time difference Ds further increases.
- the relative delay quality degradation amount 27 indicates zero until the delay time difference D s between the audio delay time Da and the video delay time Dv reaches a predetermined value. There is a tendency to monotonously decrease with further decrease in Ds.
- Fig. 25 is an example of the characteristics of slope coefficient estimation. As shown in Fig. 25, the slope a5 of the relative delay quality degradation estimation model 32 ⁇ tends to monotonously decrease as the logarithmic value of the frame rate 22C increases. In addition, the slope ⁇ 6 of the relative delay quality degradation estimation model 32C tends to increase monotonically as the logarithmic value of the frame rate 22C increases.
- the slope coefficients ⁇ 5 and ⁇ 6 can be expressed by a linear function expression using, for example, a logarithmic value of the frame rate 22C as a variable.
- the logarithmic value is log (F)
- «51, j8 51 are constants
- the slope coefficient of the relative delay quality degradation estimation model 32B is ⁇ 5
- a 5 is It can be obtained from equation (14).
- the frame rate 22C is F
- the logarithmic value is log (F)
- a61 and j861 are constants
- the slope coefficient of the relative delay quality degradation estimation model 32C is oc6.
- a 6 is obtained by the following equation (15).
- the delay quality degradation amount estimation unit 12 selects a relative delay quality degradation amount estimation model according to the magnitude relationship between the audio delay time 22A and the video delay time 22B by the relative delay quality degradation amount calculation unit 12D. (Step 517). Then, a model coefficient indicating the selected relative delay quality degradation amount estimation model is read from the storage unit 12A (step 518), and this model coefficient is read out. Is included with the slope coefficient a5 or a6 calculated by the slope coefficient calculation unit 12E to identify the slope of the selected relative delay quality degradation amount estimation model (step 519).
- the relative delay quality degradation amount 27 corresponding to the delay time difference between the audio delay time 22A and the video delay time 22B is calculated (step 520).
- the delay quality degradation amount estimation unit 12 uses the delay quality degradation amount calculation unit 12B to calculate the absolute delay quality degradation amount 26 calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount calculation unit. Based on the relative delay quality degradation amount 27 calculated in 12D, a delay quality degradation amount 23B corresponding to the audio delay time 22A and the video delay time 22B is calculated (step 521).
- steps 517 and 518 are equivalent to steps 314 and 315 in FIG. 16 described above
- step 519 is equivalent to step 417 in FIG. 19 described above
- steps 520 and 521 are the same as steps 215 and 215 in FIG. This is equivalent to 216, and a detailed description thereof is omitted here.
- the delay quality degradation amount calculation unit 12B outputs the calculated delay quality degradation amount 23B to the video communication quality estimation unit 13 (step 522), and ends a series of delay quality degradation amount estimation processing.
- the slope coefficient estimation model and the relative delay quality degradation amount estimation model are selected according to the magnitude relationship between the audio delay time and the video delay time, and the selected slope coefficient estimation model is selected.
- the inclination coefficient corresponding to the frame rate of the video media is calculated by the inclination coefficient calculation unit 12E, and the inclination of the selected relative delay quality degradation amount estimation model is specified by the inclination coefficient, and this relative delay is determined.
- the relative delay quality degradation amount calculation unit 12D estimates the relative delay quality degradation amount 27 based on the quality degradation amount estimation model, the degree to which the relative delay quality degradation is felt according to the frame rate of the video media.
- the human perception characteristics that change, and the human perception characteristic that the degree of relative delay quality degradation changes according to the relationship between the audio delay time and the video delay time.
- the relative delay quality degradation amount in consideration of both, can be accurately estimated by simple processing.
- FIG. 26 is a characteristic example of the absolute delay quality degradation amount estimation model used in the video communication quality estimation apparatus according to the sixth embodiment of the present invention.
- the absolute delay quality degradation corresponding to the sum of the delay times of the audio delay time 22A and the video delay time 22B in the absolute delay quality degradation amount calculation unit 12C of the delay quality degradation amount estimation unit 12 In the case of calculating the quantity 26, the case where the absolute delay quality degradation amount estimation model 32A is modeled by a linear function has been described as an example.
- the absolute delay quality degradation amount estimation model 32A varies to some extent depending on the environment for video communication to be evaluated. Therefore, there are cases where the estimation accuracy is improved by modeling with the nonlinear function rather than modeling the absolute delay quality degradation amount estimation model 32A with the linear function.
- R (Dr) can be estimated by the following equation (16).
- the absolute delay quality degradation amount estimation model 32A is modeled by the nonlinear function, so that the estimation accuracy can be improved. Furthermore, when the exponential function is used, the absolute delay quality degradation amount estimation model 32A can be modeled with a simple function expression. Note that this embodiment can be applied to the third to fifth embodiments, which are not limited to the second embodiment, and the same effects can be obtained.
- the relative delay quality degradation amount estimation model used for estimating the relative delay quality degradation amount 27 is based on the magnitude relationship between the audio delay time 22A and the video delay time 22B. A plurality of these models can be used to model these relative delay quality degradation estimation models using nonlinear functions.
- FIG. 27 is a characteristic example of the relative delay quality degradation amount estimation model used in the video communication quality estimation apparatus according to the seventh embodiment of the present invention.
- the relative delay quality degradation amount corresponding to the delay time difference between the audio delay time 22A and the video delay time 22B in the relative delay quality degradation amount calculation unit 12D of the delay quality degradation amount estimation unit 12 When calculating 27, the case where the relative delay quality degradation amount estimation model 32B is modeled by a linear function has been described as an example.
- the relative delay quality degradation amount estimation model 32B varies to some extent depending on the environment for video communication to be evaluated. Therefore, there are cases where the estimation accuracy is improved by modeling with the nonlinear function rather than modeling the absolute delay quality degradation amount estimation model 32A with the linear function.
- S (Ds) can be estimated by the following equation (17).
- the relative delay quality degradation amount estimation model 32B When the relative delay quality degradation amount estimation model 32B is modeled by a non-linear function, the audio delay time 22A and the video image are similar to the equations (11) and (12) described in the third embodiment.
- Two relative delay quality degradation amount estimation models 32B corresponding to the magnitude relationship of the delay time 22B are stored in the storage unit 12A, and the relative delay quality is determined based on the magnitude relationship between the audio delay time 22A and the video delay time 22B. Select the relative delay quality degradation estimation model 3 2B used to estimate degradation 27.
- FIG. 28 is another characteristic example of relative delay quality degradation amount estimation.
- the relative delay quality degradation amount 27 starts from zero until the delay time difference Ds between the audio delay time Da and the video delay time Dv reaches a predetermined value. It tends to decrease little by little and monotonously decrease as the delay time difference Ds further increases.
- the relative delay quality degradation amount 27 decreases the zero force little by little until the delay time difference Ds between the audio delay time Da and the video delay time Dv reaches a predetermined value. As the delay time difference Ds further decreases, it tends to monotonously decrease.
- the quality degradation amount 27 can be expressed by, for example, a logistic function equation in which the delay time difference between the audio delay time 22A and the video delay time 22B is a variable.
- Ds the delay time difference between the audio delay time 22A and the video delay time 22B
- ⁇ ⁇ , ⁇ 10, DslO are constants
- S (Ds) S (Ds) can be estimated by the following equation (19).
- the relative delay quality degradation amount 27 tends to converge to the coefficients ⁇ 8 to 10 at the end of the characteristic example.
- the delay quality degradation amount 23 ⁇ is normally set to the MOS value range 1 to 5, so when estimating the actual relative delay quality degradation amount 27, the above trend part at the end of the characteristic example is Not used.
- Equations (17) to (19) described above can be expressed by exponential functions.
- Equation (17) the delay time difference between the audio delay time Da and the video delay time Dv is Ds, all, j811, and Dsll are constants, and the relative delay quality degradation amount 27 is S (D In the case of s), S (Ds) can be estimated by the following equation (20).
- Ds is the delay time difference between audio delay time Da and video delay time Dv, and a 13, ⁇ ⁇ 3,
- S (Ds) can be estimated by the following equation (22).
- the video frame rate can be changed according to the setting parameters of the video communication application.
- video communication is performed between communication terminals according to the above assumed scene by changing the audio quality, the video quality including the video frame rate, and the delay time of the audio 'video in various states. Evaluate video communication quality with comprehensive consideration of quality factors using a five-level quality scale.
- MOS value Mean Opinion Score
- MOS score is 5 to 1 for each of the five grades of quality rating: “very good”, “good”, “normal”, “bad”, “very bad”, and the score given by the evaluator The average value is obtained.
- audio quality evaluation values video products The quality evaluation value is obtained in the same way. Details of the subjective evaluation experiment method are described in ITU-T recommendation P.911.
- the audio quality evaluation value and the video quality evaluation value may be values derived by applying an objective quality estimation technique such as ITU-T recommendation P.862 or ITU-T recommendation J.144 described above.
- each communication terminal that performs video communication using a multimodal service has symmetry between the audio quality evaluation value and the video quality evaluation value.
- the explanation assumes that equal audio quality evaluation values and video quality evaluation values can be obtained.
- the multimodal quality estimation unit 11 Both The multimodal quality value 23A may be calculated by combining the multimodal quality of the communication terminals.
- the multimodal quality estimator 11 estimates individual multimodal quality values 23A for each communication terminal, and the video communication quality estimator 13 estimates the multimodal quality values 23A and the delay quality degradation amount 23B. Therefore, the video communication quality value 24 may be estimated.
- the delay quality degradation amount calculation unit 12B calculates the delay quality degradation amount Dav corresponding to the audio delay time 22A and the video delay time 22B
- the absolute delay quality degradation amount R (Dr) calculated by the absolute delay quality degradation amount calculation unit 12C
- the relative delay quality degradation amount calculated by the relative delay quality degradation amount calculation unit 12D As shown in (10), the absolute delay quality degradation amount R (Dr) calculated by the absolute delay quality degradation amount calculation unit 12C and the relative delay quality degradation amount calculated by the relative delay quality degradation amount calculation unit 12D.
- S (Ds) and the sum of forces are also calculated for Dav has been described as an example, but is not limited to this.
- Dav can be estimated by the following equation (23), and the interaction between R (Dr) and S (Ds) is taken into account. Can be estimated.
- Dav a-R (Dr) + ⁇ 14- S (DS) + Y -R (Dr)-S ⁇ Ds) + ⁇ 14--(23)
- Parameters that influence the video communication environment include, for example, a communication type parameter indicating the communication type of the video communication service, a playback performance parameter indicating the playback performance of the terminal that plays back the video media, and a certain! There is a playback environment parameter indicating the playback environment.
- the communication type parameter there is a "task" indicating the communication type performed in the video communication service to be evaluated.
- playback performance parameters include the “encoding method” In addition to “Formula”, “Video Format”, and “Key Frame”, there are “Monitor Size” and “Monitor Resolution” related to media playback functions on the terminal.
- playback environment parameters include “room illuminance” during media playback on the terminal.
- the function form of the estimation model and its coefficients are stored in the storage unit for each combination of such parameters, and the function form of the estimation model or the The coefficient may be selected.
- the quality value represented by the MOS value has been described as a case where the calculated quality value is normalized so that the MOS value can be in the range of 1 to 5. If the calculated quality value falls within the range of 1 to 5, normalization processing may be omitted.
- functions such as min () and max O are given as specific examples of normalization. As an example, the case of using is described, but normal function may be performed using other functions.
- estimation model is modeled by a linear function or a nonlinear function
- these estimation models are not limited to functions. Models other than functions are used. May be.
- it may be a tabular database that defines the input / output relationship of the estimation model.
- a black box model in which only input / output characteristics are specified such as a neural network or a case base, may be used.
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- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
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- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
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Abstract
Description
Claims
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US11/990,256 US8405773B2 (en) | 2005-09-06 | 2006-09-06 | Video communication quality estimation apparatus, method, and program |
JP2007534445A JP4486130B2 (ja) | 2005-09-06 | 2006-09-06 | 映像コミュニケーション品質推定装置、方法、およびプログラム |
CA2617893A CA2617893C (en) | 2005-09-06 | 2006-09-06 | Video communication quality estimation device, method, and program |
CN200680030787XA CN101248679B (zh) | 2005-09-06 | 2006-09-06 | 视频通信品质推测装置、方法 |
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CA2617893C (en) | 2011-05-03 |
US8405773B2 (en) | 2013-03-26 |
EP1924101A4 (en) | 2011-09-14 |
JP4486130B2 (ja) | 2010-06-23 |
CN101248679B (zh) | 2010-07-14 |
CN101248679A (zh) | 2008-08-20 |
JPWO2007029731A1 (ja) | 2009-03-19 |
KR100947275B1 (ko) | 2010-03-11 |
CA2617893A1 (en) | 2007-03-15 |
EP1924101A1 (en) | 2008-05-21 |
US20090096874A1 (en) | 2009-04-16 |
KR20080028483A (ko) | 2008-03-31 |
EP1924101B1 (en) | 2013-04-03 |
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