Nippon Telegraph and Telephone Corporation

Yuichiro Urata

Kazuhisa Yamagishi

Masanori Koike

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 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 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.

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Musashino, Japan

Yuichiro Urata