Published Papers - NAKACHI Takayuki

Privacy-preserving Network BMI Decoding of Covert Spatial Attention

Takayuki Nakachi, Hiroyuki Ishihara, Hitoshi Kiya

IEEE International Conferences on Signal Processing and Communication Systems (ICSPCS2018)     2018.12 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

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Privacy-preserving SVM Computing by using Random Unitary Transformation

Takahiro Maekawa, Takayuki Nakachi, Sayaka Shiota, Hitoshi Kiya

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2018)     2018.11 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

Practical Secure OMP Computation and Its Application to Image Modeling

Takayuki Nakachi, Hitoshi Kiya

ACM International Conference on Information Hiding and Image Processing (IHIP2018)     2018.09 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

Joint Attention Estimation from Object-wise 3D Gaze Concurrences in Multiple First Person Videos and Gazes

Hiroyuki Ishihara, Takayuki Nakachi, Masanori Ogawara, Takahiro Yamaguchi

Springer European Conference on Computer Vision (ECCV2018)     2018.09 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

Slepian-Wolf Video Coding with Resolution-progressive Transmission

Takayuki Nakachi, Shinya Ishihara

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2017) ( Institute of Electrical and Electronics Engineers Inc. )  2017   170 - 175   2017.11 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

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In this paper, we propose a new Slepian-Wolf (SW) video coding that supports resolution-progressive transmission. It can realize low-delay low-resolution real time streaming as well as high lossless coding efficiency. Intra-frame video coding is performed as the base layer coder for down-sampled input video and a SW coder is used as the enhancement layer coder for lossless archiving. In order to improve SW lossless coding efficiency, we introduce inter-layer prediction between the base layer and the enhancement layer. It uses inter-layer prediction to increase the accuracy of Motion Estimation (ME). Simulations show that the proposed scheme gives higher coding performance better than the JPEG2000 lossless mode.

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[Invited] MPEG Media Transport Technologies and Its Application to Immersive Media Communication Services

Takayuki Nakachi

IEEE International Conference on Integrated Circuits, Design, and Verification (ICDV2017)     2017.10 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

Rate-Adaptive FF-LDGM Code with Selective Inter-leaving Scheme

Takayuki Nakachi, Tatsuya Fujii

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2016) ( IEEE )    116 - 121   2016.10 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

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This paper introduces a rate-adaptive FireFort-LDGM (FF-LDGM) code for MMT adaptive Application Layer FEC (AL-FEC). The FF-LDGM code is an ISO/IEC MPEG international standard issued in Feb. 2015. It can handle a wade range of block lengths from a small number of packets to several thousands of packets. Especially, it is useful for real-time UHD video transmission. In this paper, we focus on recent advances in the rate adaptive FF-LDGM code. It provides a rate adaptive function that allows the coding rate to be adaptively changed to suit the network characteristic. We improve the error recovery performance of the rate-adaptive scheme by using selective interleaving. Simulation results demonstrate its superior adaptive performance.

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[Best Paper Award] Layered Lossless Video Coding based on Slepian-Wolf Theorem

Takayuki Nakachi, Tatsuya Fujii

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS 2015)     652 - 657   2015.11 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

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Robust UHD Video Transmission using MMT FireFort-LDGM Code

Takayuki Nakachi, Yoshihide Tonomura, Daisuke Shirai, Takahiro Yamaguchi, Tatsuya Fujii

2015 IEEE International Conference on Multimedia and Expo Workshops (ICMEW 2015) ( Institute of Electrical and Electronics Engineers Inc. )    2015.07 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

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This paper introduces a FireFort-LDGM (FF-LDGM) code that is part of ISO/IEC 23008-10 (MMT AL-FEC codes) and its application to robust Ultra High Definition (UHD) video transmission. It is especially useful for UHD real-time video streaming because that it can easily handle contiguous streams containing over several thousand packets. Simulation results show its high error recovery performance with low-complexity. We also show a robust UHD video transmission scheme that uses the FF-LDGM code and its feasibility via 8K Super High-Vision live streaming over global shared IP networks at FIFA World Cup 2014 Brazil.

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Robust UHD Video Transmission using MMT FireFort-LDGM Code

Takayuki Nakachi, Yoshihide Tonomura, Daisuke Shirai, Takahiro Yamaguchi, Tatsuya Fujii

IEEE International Conference on Multimedia and Expo Workshops (ICMEW 2015)     2015.07 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

A Failure-tolerant and Spectrum-efficient Wireless Data Center Network Design for Improving Performance of Big Data Mining

Katsuya Suto, Hiroki Nishiyama, Nei Kato, Takayuki Nakachi, Toshikazu Sakano, Atsushi Takahara

IEEE Vehicular Technology Conference (VTC2015 Spring) ( IEEE )    2015.05 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

An MDRU Distributed Storage System Using Layered LDGM Codes

Takayuki Nakachi, Atsushi Okada, Tatsuya Fujii

International Symposium on signal, Image, Video and Communications (ISIVC2014)     2014.11 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

MMT AL-FEC Codes for Networked Distributed Storage

Takayuki Nakachi, Atsushi Okada, Tatsuya Fujii

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2014) ( IEEE )    2014.11 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

Toward Integrating Overlay and Physical Networks for Robust Parallel Processing Architecture

Katsuya Suto, Hiroki Nishiyama, Nei Kato, Takayuki Nakachi, Tatsuya Fujii, Atsushi Takahara

IEEE Network ( IEEE )    2014.07 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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An Overlay Network Construction Technique for Minimizing the Impact of Physical Network Disruption in Cloud Storage Systems

Katsuya Suto, Hiroki Nishiyama, Nei Kato, Takayuki Nakachi, Tatsuya Fujii, Atsushi Takahara

IEEE International Conference on Computing, Networking and Communications (ICNC2014) ( IEEE )    2014.02 [ Peer Review Accepted ]

Type of publication: Research paper (international conference proceedings)

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