We continued our research on how to use the internet to provide services adapted to diverse viewer environments.
These days, TV programs are distributed through various media, such as broadcasting and the internet, and viewed on diverse terminals including smartphones. Toward this backdrop, we began a study on a cloud-based media-unifying platform that automatically selects appropriate media and distribution sources for displaying programs in accordance with the viewer situation, and we prototyped a system. To realize the system, we investigated a link description scheme and conducted experiments to measure the reception status of broadcasting and broadband networks in living environments.
We conducted verification experiments on a system that synchronizes real-time data on broadcasting by using Hybridcast's high-accuracy synchronization function between broadcasting and telecommunications networks. For SHV multimedia broadcasting, we prototyped a receiver to verify a general data transport method standardized by ARIB for data multiplexed by MPEG Media Transport (MMT).
In our research on device linkage services, we investigated new service systems that link TV with IT technology. We prototyped a system that presents appropriate information based on viewing logs and a smartphone's positioning information. We also developed “8K Time into Space,” which displays a large number of videos on an 8K display and allows the viewer to select one by touching or gesture, and advanced “Augmented TV” that utilizes an augmented reality (AR) technology for TV. We also began a study on a TV-watching robot that provides company to people watching TV alone at home, for which we developed functions to detect the TV position and to generate utterances related to the program.
In our research on the utilization of program information, we are studying more convenient broadcast broadband services that bridge TV viewing with daily activity. We designed and prototyped a base system for linking TV with diverse smartphone applications and Internet of Things (IoT)-enabled devices, and developed extended functions of common companion application for Hybridcast.
For the effective utilization of broadcast data, we provided program data in Linked Data format, developed new educational and sports services using data structuring, and investigated entity linking that links person information contained in closed captions of programs with Wikipedia article headings.
In our research on technologies for promoting Hybridcast, we conducted a browser performance test at the IPTV Forum to improve receiver performance and investigated HbbTV in Europe to examine mutual operation with HbbTV.
In our research on internet delivery technology, we continued our work from FY 2015 by developing an MPEG-DASH player. Our player technologies were made available to the members of the IPTV Forum and have been widely used by commercial broadcasters and content providers, contributing to the creation of new delivery services. For more stable video distribution, we developed a delivery path control technology that carefully controls the delivery path of each viewer terminal in accordance with the congestion status and a transmission rate control technology that continues stable live video distribution even when the access connection increases.
Regarding security technologies, we made progress in research on attribute-based encryption that can restrict information access by service providers according to their attributes while protecting viewer information stored on cloud servers. We developed an encryption scheme that reduces the processing burden of the viewing terminal and an encryption scheme that can search encrypted data without decryption. We also developed lightweight symmetric encryption to conceal information securely in IoT-enabled devices and studied traitor tracing cryptography to prevent illegal copying of the receiver’s decryption key. Moreover, we began a survey on the cyber security of broadcasters.