JP2014230188A - Perception quality personalizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perception quality personalizing device capable of improving resource-effectiveness in service provision by enabling a service provider to grasp user-effectiveness, and capable of improving work efficiency by eliminating the need for a user to perform a setting change by himself/herself, a perception quality personalizing method and a perception quality personalizing program.SOLUTION: A perception quality personalizing device 91 comprises: an effectiveness function holding part 13 for holding an effectiveness function which determines, for each user, effectiveness digitizing a degree of satisfaction of the user with respect to a perception quality that may influence the perception of the user of a service provision destination in the quality of services provided using a communication network; a perception quality measuring part 12 for measuring the perception quality in the provision of the service from the communication network; and a personalizing control part 15 which refers to the effectiveness function to calculate effectiveness with respect to the perception quality and changes the perception quality for the user in accordance with the calculated effectiveness.

Description

  The present invention relates to a control device for personalizing the perceived quality of a service provided through a network so that the utility of a user is maximized.

  Currently, utility (satisfaction that a user obtains from a service) is widely known as a comprehensive evaluation index of the service. Services have different perceived qualities (the quality that users perceive from the service), and users have different values and preferences for different perceived qualities, so they received services with exactly the same perceived quality Even in this case, the utility obtained by each user is different.

  Here, considering the provision of commercial services using a network, there is a limitation in the amount of resources that can be used, such as bandwidth, due to problems such as cost, so that every user can obtain a sufficiently large utility at all times. It is difficult to continue to provide services with the highest perceived quality. Therefore, there are various technologies for providing services with greater utility within limited resources.

  One is a technology that uses limited resources more efficiently and improves perceived quality. For example, in Patent Document 1, in the streaming distribution service, when the packet loss rate at the user terminal is equal to or greater than a threshold, the quality of streaming transmitted from the distribution server is reduced. In streaming distribution services, if the bit rate on the transmission side is too high for the available bandwidth, the packet loss will increase and the perceived quality of the user will decrease significantly. Is effectively used to improve the perceived quality of the user.

  In addition, there is a technique for improving the utility of the entire user by providing a service with a perceptual quality adapted to the majority so that more users determine that the perceived quality is good. In Non-Patent Document 1, a plurality of users subjectively evaluate a call sound having various perceptual qualities (eg, call sound volume, call sound delay, etc.), and the average value is obtained. calculate. The overall perceived quality of call speech is improved using this average value as an evaluation index. In Non-Patent Document 2, an objective measurement value such as room noise, delay, and echo is used as a variable, and it is referred to as an R value as an evaluation index that integrates the perceived quality of call speech based on a predetermined relational expression. Calculate the value. In Non-Patent Document 3, as a study for clarifying the relationship between various perceptual quality and utility of services, perceived quality degradation affects the utility for each video genre (sports, news, etc.) in video viewing. Analyzing the degree of impact. In this method, the utility of an average user is improved by allocating more bands to perceived quality that is important for each genre of moving images. In this way, there is a technique for improving the utility by providing a service that many users consider as being of high perceptual quality on average considering the perceived quality of the user.

  Furthermore, even if the exact same service is received, because the utility obtained by the subjectivity is different, in Non-Patent Document 4, research on a personalized search method that changes information provided according to the preference of each individual user has been conducted, The utility is improved by fine-tuned control tailored to each individual user.

  As described above, in order to increase the utility of the user, the control of the perceptual quality is important, but the service has a plurality of types of perceptual quality, not a single perceptual quality. At this time, even if the plurality of types of perceived quality received by the user are exactly the same, the utility obtained by each user from the service differs depending on the user's values and preferences. Therefore, when maximizing the utility of each user in a limited resource, it is necessary to personalize various perceptual qualities according to the user's values and preferences.

  However, in the current service provision, only personalization that changes the provided content itself, such as recommendations in e-commerce services and search services, is performed, and perceived quality takes into account the influence of users on their utility. It is controlled by changing the setting value of the service. For example, in a video viewing service, the user himself / herself controls the perceived quality by using a function for changing the image quality setting within resource constraints such as bandwidth.

  As described above, personalization of perceptual quality is performed by the user, and the service provider does not have an index for grasping the relationship between the perceptual quality and the utility of the user, and cannot correctly grasp the utility of the user. Also, the perceived quality of services is not optimized for utility, so the utility of resources in providing services is low. And since the user takes time and effort to change the setting every time personalization of perceptual quality, work efficiency is low.

JP 2008-11177 A

ITU-TP 800, “Methods for Subjective Determining of Transmission Quality” ITU-T G. 107, “The E-model: a computational model for use in transmission planning”. Atsushi Honda, Yuka Kato, Katsuya Hakozaki, “Analysis of relationship between user satisfaction and video content for video quality degradation” IEICE Technical Report, Nov 2003. Jaime Teevan, Susan T. Dumais, Eric Horvitz, “Personalizing Search via Automated Analysis of Activities and Activities”, SIGIR, pp. 449-456, 2005.

  It is an object of the present invention to provide a perceptual quality personalization apparatus, a perceptual quality personalization method, and a perceptual quality personalization program capable of personalizing perceptual quality reflecting user subjective judgment and improving resource utilization. .

The perceptual quality personalization device of the present invention is:
A utility that holds utility functions that define the utility of each user for the perceived quality that can affect the perception of the service providing user among the quality of services provided using the communication network, for each user. A function holding unit;
A perceptual quality measuring unit that measures the perceptual quality at the time of providing the service from the communication network;
Obtaining a utility for the perceptual quality measured by the perceptual quality measurement unit with reference to the utility function, and changing the perceptual quality to the user according to the obtained utility;
Is provided.

In the perceptual quality personalization device of the present invention,
An available resource amount measuring unit that measures the available resource amount available for providing the service from the communication network;
A required resource amount holding unit that holds information about the amount of resources necessary for providing the service of the perceptual quality;
Further comprising
The personalization control unit acquires the perceptual quality necessary for realizing the obtained utility from the required resource amount holding unit, and approaches the available resource so as to approach the perceived quality acquired from the required resource amount holding unit. The perceptual quality for the user may be changed within the range of the available resource amount measured by the amount measuring unit.

The perceptual quality personalization method of the present invention is:
A utility that holds utility functions that define the utility of each user for the perceived quality that can affect the perception of the service providing user among the quality of services provided using the communication network, for each user. Function holding procedure,
A perceptual quality measurement procedure for measuring the perceptual quality at the time of providing the service from the communication network;
Obtaining a utility for the perceptual quality measured in the perceptual quality measurement procedure with reference to the utility function, and changing the perceptual quality to the user according to the obtained utility;
In order.

In the perceptual quality personalization method of the present invention,
In the utility function holding procedure, information on a resource amount necessary for providing the service of the perceptual quality is held in a required resource amount holding unit,
In the perceptual quality measurement procedure, the amount of available resources available for providing the service is measured from the communication network;
In the personalization control procedure, the perceived quality necessary for realizing the obtained utility is acquired from the required resource amount holding unit, and the available resources are approximated to the perceived quality acquired from the required resource amount holding unit. The perceptual quality for the user may be changed within the range of the available resource amount measured by the amount measurement procedure.

  The perceptual quality personalization program of the present invention is a program for causing a computer to execute a utility function holding procedure, a perceptual quality measurement procedure, and a personalization control procedure.

  According to the present invention, since the utility function is held, the service provider can grasp the utility of the user, and the resource utility in the service provision can be changed in order to change the perceived quality to the user according to the utility function of each user. Can be increased. Accordingly, the present invention provides a perceptual quality personalization device, a perceptual quality personalization method, and a perceptual quality personalization program that enables personalization of perceptual quality that reflects the subjective judgment of a user and can improve resource utilization. Can do.

It is the figure which showed schematic structure of the perceptual quality personalization apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows an example of the perceptual quality personalization control which concerns on this embodiment. An example of a resolution utility function is shown. An example of the utility function of the frame rate is shown. An example of the required resource amount required for providing a service is shown. An example of the utility obtained from the various perceived qualities of the service will be shown.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

  FIG. 1 is a diagram showing a schematic configuration of a perceptual quality personalization apparatus according to a first embodiment of the present invention. The perceptual quality personalization apparatus 91 according to the present embodiment receives information collected from the service-related system group 92 related to service provision, and personalizes perceptual quality so as to match each user's sense. The service is an arbitrary service provided using a communication network, for example, a moving image viewing service. The perceptual quality personalization apparatus 91 and the service related system group 92 are connected via a communication network used by the service to be provided. The perceptual quality personalization device 91 may be installed by a service provider or a third party who specializes in service personalization.

  The perceptual quality is a quality that can influence the perception of the service providing user among the quality of the service. When the service is a video viewing service, the perceptual quality is, for example, a resolution or a frame rate that can affect the user's vision, or a bit rate of sound that can affect the user's hearing. Since the resolution or the frame rate has a great influence on the amount of available resources, it is preferable that the perceptual quality includes at least one of the resolution and the frame rate. Information related to service provision is, for example, packet loss rate, RTT (Round-Trip Time), CPU (Central Processing Unit) usage rate, and user terminal application information.

  The service-related system group 92 is an arbitrary apparatus group related to service provision, and includes a user terminal under the management of the user who receives the service, a network apparatus constituting the communication network, and a terminal under the management of the service provider. . The terminals under the management of the service provider include a service server used by the service provider, a distribution server that distributes moving image content, and a service control device that controls a distribution service of moving image content.

  The perceptual quality personalization device 91 according to this embodiment is a perceptual quality personalization device 91 that performs personalization of a service provided using a network. A measurement unit 12 and a utility function holding unit 13 that holds a utility function representing utility obtained from a certain perceptual quality are provided.

  The perceptual quality personalization apparatus 91 according to the present embodiment further includes an available resource amount measuring unit 11 that measures an available available resource amount related to service provision, and a necessary resource amount necessary to realize a certain perceptual quality. Necessary resource amount holding unit 14 having the above information, and perception quality measuring unit 12, utility function holding unit 13, available resource amount measuring unit 11 and necessary resource amount holding unit 14 are used as input for perception quality personalization. And a personalization control unit 15 for determining the control contents to be output to the outside of the perceptual quality personalization device 91, and automatically perceiving the perceived quality of the service.

  FIG. 2 is a flowchart showing an example of the perceptual quality personalization method according to the present embodiment. The perceptual quality personalization method according to the present embodiment is a perceptual quality personalization control method for controlling the perceptual quality for each user to whom a service is provided.A utility function holding procedure, a perceptual quality measurement procedure, a personalization control procedure, In order. In the utility function holding procedure, step S101 is executed. In the perceptual quality measurement procedure, step S104 is executed. In the personalization control procedure, steps S105 to S107 are executed.

Step S101 is executed in advance before viewing the moving image. In step S101, the utility function holding unit 13 and the necessary resource amount holding unit 14 are operated.
The utility function holding unit 13 holds a utility function that represents the utility obtained from a certain perceptual quality as a numerical value. The utility function is a function obtained by quantifying the utility obtained by the user with respect to the setting of the perceptual quality.
The required resource amount holding unit 14 holds information about the required resource amount necessary for realizing a certain perceptual quality in service provision. The required resource amount is an amount of resource necessary for providing a service with a predetermined perceptual quality. The required resource amount is, for example, a band necessary for providing a moving image with HD resolution and a frame rate of 30 fps.

  When there is a request to start a service from the user terminal (step S102), the service provider's terminal in the service related system group 92 inquires the perceptual quality personalization device 91 for the control content (step S103).

In step S104, the available resource amount measuring unit 11 and the perceptual quality measuring unit 12 are operated.
The available resource amount measuring unit 11 collects information measured by a terminal, server, network control device, etc. connected to the communication network in the service related system group 92 via the communication network, and provides a service from the collected information. Measure the state of the resources involved. The resource state is, for example, an available bandwidth at a network bottleneck.
The perceptual quality measuring unit 12 measures the perceptual quality at the time of service provision from the service related system group 92. For example, the perceptual quality measurement unit 12 collects information measured by a terminal, a server, a network control device, or the like connected to a communication network in the service-related system group 92 via the communication network, and a user is obtained from the collected information. Measure the perceived quality of the service.

  In step S105, the personalization control unit 15 refers to the utility function to obtain the utility for the perceptual quality measured by the perceptual quality measurement unit 12, and changes the perceived quality to the user according to the obtained utility. At this time, the personalization control unit 15 obtains the perceptual quality that maximizes the utility of the user, and outputs a notification to the service related system group 92.

The behavior of each functional unit will be described in detail.
The utility function holding unit 13 creates and holds a utility function in advance by, for example, a service provider conducting a questionnaire to the user before watching a moving image. The utility function acquires the perceived quality by the service provider conducting a questionnaire to the user and the like, and inputs it to the utility function holding unit 13. The utility function holding unit 13 creates a utility function using the input perceptual quality.

  For example, when the perceptual quality is resolution and frame rate, the utility function holding unit 13 creates the utility function as follows. The service provider prepares a plurality of sample moving images having different resolutions and frame rates, allows the user to view the questionnaire, and takes a questionnaire about the perceived quality of each resolution and frame rate. Here, the perceived quality of taking a questionnaire is, for example, the lowest quality and the highest quality. The minimum quality is a perceived quality that is expected at a minimum in future service use. The highest quality is the perceived quality above which it feels satisfactory. The lowest quality is a point at which the user feels dissatisfied at a lower perceptual quality, and the utility is drastically reduced, and the highest quality is a point at which the utility does not become larger even if the perceptual quality is further improved. Therefore, in the setting of the utility function, the utility function holding unit 13 sets the utility to −1 for the perceived quality less than the minimum quality, sets the utility to 1 if it is the highest quality or higher, and sets the utility to 1 if the highest quality is lower than the highest quality. The utility is increased linearly in the range of 0-1. In this way, a utility function for quantifying the utility obtained by the user from a certain perceptual quality is obtained.

  3 and 4 show examples of utility functions of resolution and frame rate. The utility function of resolution is divided into a positive utility and a negative utility at 540p, and is 1 at a resolution of 720p or higher. The frame rate utility function is divided into a positive utility and a negative utility at 30 fps, and is 1 at a frame rate of 60 fps or higher.

  In FIGS. 3 and 4, the quality is expressed using numerical values such as 1080p for the resolution and 60 fps for the frame rate. However, the utility function only needs to be able to associate the perceived quality with the utility. The perceptual quality may be expressed as 1 (low), 2 (slightly low), 3 (normal), 4 (slightly high), or 5 (high). The function need not take a continuous value, and the service provider may set the utility function by analyzing the service usage history of the user without using a questionnaire or the like.

  The required resource amount holding unit 14 holds the required resource amount necessary for providing the service in each combination of perceived quality that can be taken by the service that is the domain of the utility function. The required resource amount is, for example, a bandwidth necessary for transmitting a moving image having a set resolution at a set frame rate. FIG. 5 shows the average bandwidth required to provide the perceptual quality shown in FIGS. 3 and 4 by encoding the viewing video in advance and dividing the file size by the video time. . The required resource amount does not necessarily have to be pre-calculated and held in advance, and may be obtained by performing sequential calculation or measurement using collected information.

  When there is a request to start the service from the user terminal (step S102), the service provider inquires the perceptual quality personalization device 91 for the control contents (step S103). When there is an inquiry about the control content from the service provider, the available resource amount measuring unit 11 measures the available resource amount that is a resource related to the service provision at the start of video viewing or at a regular timing during viewing ( S104). For example, the RTT value collection and the estimation method of the bottleneck available bandwidth using the value are used between the video distribution server and the user terminal, the distribution server measures the available resource amount, and the measurement result is used as the available resource amount. Acquired by the measurement unit 11. When the service-related system group 92 includes a terminal that monitors the available resource amount, the available resource amount measurement unit 11 may directly acquire the available resource amount from the terminal. Further, when it is desired to use a more detailed available resource amount, the available resource amount measurement unit 11 collects or measures information such as the usage rate of the user terminal CPU and free memory necessary for accurately rendering the moving image. It is preferable to do.

The personalization control unit 15 obtains the utility function represented by the formula (1) from the utility function holding unit 13 and starts the service represented by the required resource amount holding unit 14 by the formula (2) at the start of the video viewing. A function representing the correspondence with the resource amount required for providing with a certain perceptual quality is acquired, and the available resource amount R _ava = (R _1ava , R _2ava ,..., R _mava from the available resource amount measurement unit 11. ) To get.

(Equation 1)
S _i = f _i (Q _i ) Equation (1)
However, i = 1, 2,..., N.
(Equation 2)
Q _i = g _i (R _i1 , R _i2 ,..., R _im ) Equation (2)

Then, the personalization control unit 15 determines the optimum perceptual quality of the service to be provided by solving the equation (3), and notifies the service related system group 92 of the control content (S105).
(Equation 3)
max: S = (S ₁ , S ₂ ,..., S _n ) Equation (3)
Here, s. t. R _ava > R _total .

Here, S _i is the utility that the user obtains from the perceptual quality Q _i , S _i = f _i (Q _i ) is the utility function of the perceptual quality Q _i , and R _ij (j = 1, 2,..., M) is the perception. required resource amount that is required when providing service quality _{Q i, Q i = g i} (R i1, R i2, ......, R im) provides services in perceptual quality _{Q i} and perceptual quality _{Q i} A function that expresses the relationship with the required resource amount at the time, R _ava provides the available resource amount at the time of measuring the resource amount, and R _total provides the service with perceived quality (Q ₁ , Q ₂ ,..., Q _n ). S is a total value of necessary resource amount required for the service, and S is a utility (hereinafter referred to as a service utility) obtained from the various perceived qualities possessed by the user. _{R ava>} R _total all resources _{(R 1, R 2, ......} , R m) indicates that resource requirements against falls below the amount of available resources.

For example, when the utility of the service is a simple sum such as S = S ₁ + S ₂ ... + S _i , the combination of the perceptual qualities as shown in FIG. 6 is obtained from the utility function shown in FIGS. The utility of the service in each case is obtained. The utility of the service may be obtained by weighting the utility obtained from each perceptual quality depending on the genre of the moving image, or ignoring the utility obtained from a certain perceptual quality under a specific situation.

  The perceptual quality measurement unit 12 measures the perceptual quality of the target service using the information acquired from the service related system group 92 (S106). For example, the feedback from the user terminal, the resolution and frame rate setting of the video transferred from the distribution server, the packet loss rate in the network device, the packet transfer jitter, and the resolution of the video actually received by the user terminal Measure the frame rate.

  Since the perceived quality is the quality that the user actually perceives, in advanced measurement, whether or not the user is moving away from the display and listening to the sound is working. Alternatively, the determination may be made using an image captured by a camera installed in a room where a display is installed. In this case, since the perceptual quality of the moving image is the perceptual quality that does not affect the utility, the perceptual quality measuring unit 12 measures only the perceived quality of the sound.

During video viewing, personalized control unit 15 periodically from perceptual quality measurement unit 12, a perceptual quality which the user is receiving at the time of perceived quality measurement _{Q now (Q now = Q 1now} , Q 2now, ...... , _Qnow ) and obtain the utility of the user who is viewing the moving image using the utility function. Then, the personalization control unit 15 confirms whether the obtained utility is equal to or more than a threshold value determined by the user or the service provider (S107).

If the value is below the threshold value (Yes in S107), the service provider is notified again of the control content to the optimum perceptual quality so as to be equal to or higher than the threshold value (S104 and S105). The terminal of the service provider that has received this control content improves the resolution of the moving image provided to the user or increases the frame rate.
On the other hand, if it is equal to or greater than the threshold (No in S107), the process proceeds to step S106.
In this way, the utility of the user who is viewing the moving image is monitored, and step S106 or steps S104 to S106 are repeated according to the threshold value.

  As described above, optimal perceptual quality control can be performed by performing the perceptual quality personalization control shown in FIG. Note that FIG. 2 shows a flow in which step S106 or steps S104 to S106 are repeated, but the present invention is not limited to this. For example, in the case of a moving image viewing service, the perceptual quality personalization control is terminated when the service provision is terminated by the user's playback termination process or the like.

According to the perceptual quality personalization apparatus 91 of the present embodiment, the following operational effects are achieved.
By creating and holding a perceptual quality utility function to be controlled for each user in the utility function holding unit 13, the service provider obtains each user from various perceptual qualities of the service such as resolution and frame rate. It provides a means to grasp the utility numerically.
In the utility function holding unit 13, by setting the utility function variable to the perceptual quality, it can be set based on the intuitive perceptual quality of the user. As a result, the user can make a more intuitive judgment and answer as compared with a case where an index such as Mbps, which is a network quality index, is used as a reference.

  In the necessary resource amount holding unit 14, personalization control can be quickly performed by linking with the combination of the perceived qualities before starting the service provision and holding the resource amount necessary for providing the perceived quality. For example, in a moving image viewing service, encoding is performed by specifying a resolution and a frame rate, so that the processing in the personalization control unit can be reduced by holding the bit rate information obtained at that time.

  The personalization control unit 15 collects utility function information, necessary bit rate information, and usable bandwidth information from the utility function storage unit 13, required resource amount storage unit 14, and available resource amount measurement unit 11, respectively, and solves the optimization problem. It is possible to automatically determine the setting value of the perceptual quality that maximizes the utility of the user. The service provider can provide a moving image with higher utility according to the preference of each individual user using the obtained setting value.

  Since the personalization control unit 15 optimizes the resource utility, less resources are consumed even when the same utility is provided, so that the required investment in the resources of the service provider and the network provider is reduced. .

  The perceived quality measurement unit 12 periodically monitors the perceived quality of the user while providing the service, so that the service provider can determine whether the user is satisfied with the service along with the utility function held. You can judge whether you are not feeling.

  In the perceptual quality measuring unit 12, by measuring detailed information such as the user listening to only the sound without viewing the video and watching the video, the image quality is lowered, and more resources are allocated for improving the sound quality. It is possible to further increase resource effectiveness.

  The perceptual quality personalization device 91 includes the perceptual quality measuring unit 12 and the utility function holding unit 13 to provide means for grasping the utility obtained by the user from the perceived quality of the service. This enables the personalization control unit 15 to personalize perceptual quality that reflects the subjective judgment of the user, improving the resource effectiveness and increasing the utility obtained by the user compared to services that are not personalized. .

  Furthermore, since the perceptual quality personalization device 91 includes the available resource amount measuring unit 11, the necessary resource amount holding unit 14, and the personalization control unit 15, automatic personalization becomes possible, the burden on the user is reduced, and the resource status of the user is reduced. Compared with personalization without grasping the system, the work efficiency and effect of maximizing the utility are improved.

  The apparatus of the present invention can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.

  The present invention can be applied to the information communication industry.

11: Available resource amount measuring unit 12: Perceptual quality measuring unit 13: Utility function holding unit 14: Necessary resource amount holding unit 15: Personalization control unit 91: Perceptual quality personalization device 92: Service related system group

Claims (5)

A utility that holds utility functions that define the utility of each user for the perceived quality that can affect the perception of the service providing user among the quality of services provided using the communication network, for each user. A function holding unit;
A perceptual quality measuring unit that measures the perceptual quality at the time of providing the service from the communication network;
Obtaining a utility for the perceptual quality measured by the perceptual quality measurement unit with reference to the utility function, and changing the perceptual quality to the user according to the obtained utility;
Perceptual quality personalization device comprising. An available resource amount measuring unit that measures the available resource amount available for providing the service from the communication network;
A required resource amount holding unit that holds information about the amount of resources necessary for providing the service of the perceptual quality;
Further comprising
The personalization control unit acquires the perceptual quality necessary for realizing the obtained utility from the required resource amount holding unit, and approaches the available resource so as to approach the perceived quality acquired from the required resource amount holding unit. Changing the perceived quality to the user within the range of the available resource amount measured by the quantity measuring unit;
The perceptual quality personalization apparatus according to claim 1. A utility that holds utility functions that define the utility of each user for the perceived quality that can affect the perception of the service providing user among the quality of services provided using the communication network, for each user. Function holding procedure,
A perceptual quality measurement procedure for measuring the perceptual quality at the time of providing the service from the communication network;
Obtaining a utility for the perceptual quality measured in the perceptual quality measurement procedure with reference to the utility function, and changing the perceptual quality to the user according to the obtained utility;
A perceptual quality personalization method comprising: In the utility function holding procedure, information on a resource amount necessary for providing the service of the perceptual quality is held in a required resource amount holding unit,
In the perceptual quality measurement procedure, the amount of available resources available for providing the service is measured from the communication network;
In the personalization control procedure, the perceived quality necessary for realizing the obtained utility is acquired from the required resource amount holding unit, and the available resources are approximated to the perceived quality acquired from the required resource amount holding unit. Changing the perceived quality to the user within the range of available resources measured by the quantity measurement procedure;
The perceptual quality personalization method according to claim 3.   A perceptual quality personalization program for causing a computer to execute the utility function holding procedure, the perceptual quality measurement procedure, and the personalization control procedure according to claim 3 or 4.

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