Nippon Telegraph and Telephone Corporation

Kazuhisa Yamagishi

Takanori Hayashi

Yuichiro Urata

Masanori Koike

Taichi Kawano

Jun Okamoto

Shoko Takahashi

Daisuke Kobayashi

Ken Nakamura

Yoichi Matsuo

Takuto Kimura

Noritsugu Egi

Noriko Yoshimura

Hideaki Kinsho

Kimiko Kawashima

Pierre Lebreton

An information processing apparatus including: an experience quality estimation unit that estimates an experience quality value by replacing a plurality of index values included in viewing history data of an image with an index value corresponding to a case other than any one of a plurality of predetermined bit rates; a contribution degree calculation unit that calculates a contribution degree of each bit rate included in the plurality of bit rates to an experience quality value on the basis of the estimated experience quality value; and a contribution degree output unit that outputs information indicating the contribution degree.

Information processing apparatus, analysis method and program

A video quality estimation device for estimating quality to be experienced by a user during viewing of a video includes a video quality estimation unit that calculates a video quality estimation value based on a parameter related to video quality of a high image quality region in the video, a parameter related to video quality of a low image quality region in the video, and a parameter related to a time for switching from a low image quality display state to a high image quality display state.

Video quality estimation apparatus, video quality estimation method and program

A VR video encoding parameter calculation device includes a quality estimation unit configured to calculate an overall quality estimation value of a VR video for an individual encoding parameter of a plurality of encoding parameters and a VR video parameter extraction unit configured to extract an encoding parameter corresponding to the overall quality estimation value that satisfies given target quality from the plurality of encoding parameters.

VR video encoding parameter calculation apparatus, VR video encoding parameter calculation method and program

A coded data generation method of generating coded data of a plurality of bit rates in which an image is encoded includes the steps of: acquiring an evaluated value at distribution destinations of the generated coded data when the coded data is reproduced; and changing the bit rate of the coded data to be generated based on a distribution of the acquired evaluated value in all channels.

Encoding data generation method, encoding data generation apparatus and program

A mathematical model deriving apparatus includes an encoding unit that generates a plurality of deteriorated videos after encoding an original video, in accordance with a plurality of combinations of a plurality of encoding parameters for a codec setting, a quality estimation unit that calculates a quality estimation value of each of the plurality of deteriorated videos, and a deriving unit that outputs video quality in response to the plurality of encoding parameters as input and derives a coefficient of a mathematical model in accordance with the quality estimation value and the plurality of combinations of the plurality of encoding parameters. This allows for deriving a mathematical model capable of evaluating quality according to a codec setting.

Mathematical model derivation apparatus, mathematical model derivation method and program

An engagement estimation apparatus includes an acquisition unit configured to acquire, for each measurement section after an instruction of a start of a view of an video delivered through a network, any of a parameter related to a coding quality of the video in the measurement section and a parameter related to a viewing state of the video in the measurement section, and an estimation unit configured to calculate an estimation value of an index for evaluation of engagement for each measurement section based on a parameter acquired by the acquisition unit in the measurement section. Thus, it is possible to estimate engagement based on parameters that can be observed in a terminal.

Engagement estimation apparatus, engagement estimation method and program

A viewing abandonment factor estimation device includes a memory; and a processor configured to include an estimation model for estimating a factor, the estimation model including a plurality of feature quantities measurable for viewing of a video relevant to an adaptive bit rate video distribution as inputs and the factor of the viewing abandonment in the viewing as an output.

Cause-of-viewer-disengagement estimating apparatus, cause-of-viewer-disengagement estimating method and program

A video streaming device that divides a video in which a plurality of viewing directions are defined into divided data pieces and distributes each of the divided data pieces in a chronological order. The video streaming device includes: a prediction unit that refers to information indicating the viewing direction of a viewer for each of the divided data pieces with respect to multiple views of the video in the past, and predicts, for a terminal playing the video, the viewing direction of a user of the terminal in a first divided data piece that is undistributed; and a streaming unit that distributes the first divided data piece to the terminal by setting an area corresponding to the viewing direction predicted by the prediction unit to be in a relatively high image quality among selectable image qualities. Thereby, probability of viewing the video of a low image quality is decreased.

Video distribution apparatus, video distribution method and program

A control apparatus includes an acquisition unit that acquires application information related to at least one of a plurality of sessions at a plurality of timings for each of the plurality of sessions related to a plurality of types of applications that are communicating in a network, a search unit that searches for an allocation band of each of the plurality of sessions at the plurality of timings based on a QoE prediction value of each of the plurality of sessions derived from the application information and a condition for a band of the network, and a control unit that controls allocation of a band for each of the plurality of sessions at the plurality of timings based on the allocation band searched by the search unit.

Control apparatus, control method and program

A video quality estimation device for estimating a quality experienced by a user in a tile-based video distribution service in which a video is divided into tiles and distributed includes a video quality parameter extraction unit that extracts a first parameter representing a quality of a first tile and a second parameter representing qualities of one or more second tiles, from a received tile-based video; and a video quality estimation unit that estimates a quality of the tile-based video by using the first parameter and the second parameter.

A watching behavior estimation device includes an input unit to which a value of a first index indicating a playback state of a video distributed via a network is input, and a calculation unit configured to calculate, by applying the value which is input to the input unit to a function indicating a relationship between the first index, and a second index regarding a behavior of a viewer of the video, an estimated value of the second index, thereby making it possible to estimate the behavior of the viewer of the video distributed via the network.

Viewer behavior estimation apparatus, viewer behavior estimation method and program

This streaming design assistance method assists in the selection of an encoding condition for increasing the watching time in adaptive bitrate video streaming by causing a computer to execute: estimating a relationship between a watching time or an abandonment rate and an application quality index according to a mathematical model on the basis of an actual value of a watching time of each of a plurality of first sessions related to video streaming and an actual value of an application quality index of each of the sessions; estimating the application quality index of each of the sessions for each of a plurality of encoding conditions related to video streaming on the basis of the plurality of encoding conditions and an actual value of time-series throughput of each of a plurality of second sessions; and applying the application quality index estimated under each of the encoding conditions to the relationship to estimate an average watching time of the plurality of second sessions.

Distribution design support method, distribution design support apparatus and program

An engagement estimation apparatus includes: an acquisition unit configured to acquire a value of a parameter affecting a quality of video streaming in a certain period; and a calculation unit configured to substitute the value of the parameter acquired by the acquisition unit in an equation representing a relation between the parameter indicative of the quality and engagement with the video streaming to calculate a value of an index indicative of the engagement, thereby enabling estimation of the engagement with the video streaming.

An audio-visual quality estimation device includes: an audio quality estimator to estimate audio quality for each unit time starting from a playback start time of an audio-visual content, based on a parameter affecting audio quality among parameters related to the content; a video quality estimator to estimate video quality for each unit time, based on a parameter affecting video quality among the parameters related to the content; a unit time quality estimator to unify the audio quality and video quality for each unit time, to estimate audio-visual quality for each unit time; an encoding quality estimator to unify the audio-visual quality for the unit times into one value, to estimate audio-visual encoding quality with respect to encoding degradation, considering temporal quality fluctuation; and an audio-visual quality estimator to estimate the audio-visual quality perceived by a viewer after an end of the content, based on the audio-visual encoding quality.

Audio-visual quality estimation device, method for estimating audio-visual quality, and program

A video quality evaluation apparatus for evaluating a video quality that a user experiences for a service in which a 3D video is used, the video quality evaluation apparatus including: a 2D video quality derivation unit configured to derive, from input 3D video data, a left eye video quality that is a quality of a left eye video that is included in the 3D video data and a right eye video quality that is a quality of a right eye video that is included in the 3D video data; and a 3D video quality derivation unit configured to derive a quality of the 3D video from the left eye video quality and the right eye video quality.

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Musashino, Japan

Kazuhisa Yamagishi