甲藤 二郎

J-GLOBALへ         更新日: 19/10/05 17:13
 
アバター
研究者氏名
甲藤 二郎
 
カットウ ジロウ
eメール
kattowaseda.jp
URL
http://www.katto.comm.waseda.ac.jp/
所属
早稲田大学
部署
理工学術院 基幹理工学部
職名
教授
学位
博士(工学)(東京大学)
科研費研究者番号
70318765
ORCID ID
0000-0002-1671-2614

研究分野

 
 

経歴

 
1992年
 - 
1999年
NEC C&C研究所
 
1996年
 - 
1997年
米国プリンストン大学 客員研究員
 
1999年
 - 
2004年
早稲田大学 理工学部 助教授
 
2004年
 - 
2008年
早稲田大学 理工学部 教授
 
2004年
 - 
2008年
新エネルギー・産業技術総合開発機構 主任研究員
 

委員歴

 
2001年5月
 - 
2007年4月
電子情報通信学会 情報ネットワーク研究専門委員会  専門委員
 
2004年6月
 - 
2005年6月
映像情報メディア学会 論文部門委員会  論文委員
 
2005年6月
 - 
2009年5月
映像情報メディア学会編集委員会  編集委員
 
2007年4月
 - 
2009年3月
情報処理学会 AVM研究会  主査
 
2007年5月
 - 
2009年4月
電子情報通信学会 画像工学研究会  副委員長
 

受賞

 
2015年9月
電子情報通信学会 フェロー
 
2006年9月
電子情報通信学会 通信ソサイエティ 活動功労賞
 
1995年9月
電子情報通信学会 学術奨励賞
 
1991年11月
SPIE VCIP 1991, Best Student Paper Award
 

論文

 
Kanemitsu H, Kanai K, Katto J, Nakazato H.
IEEE International Conference on Cloud Computing, CLOUD   2019-July 193-195   2019年   [査読有り]
Kawakami W, Kanai K, Wei B, Katto J.
IEICE Transactions on Communications   E102B(4) 741-750   2019年   [査読有り]
Yasumaru M, Cheng Z, Yoloyama R, Knai K, Katto J.
2019 IEEE International Conference on Consumer Electronics, ICCE 2019      2019年   [査読有り]
Abobeah R, Torki M, Shoukry A, Katto J.
VISIGRAPP 2019 - Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications   5 583-589   2019年   [査読有り]
Hirao K, Cheng Z, Takeuchi M, Katto J.
2019 IEEE International Conference on Consumer Electronics, ICCE 2019      2019年   [査読有り]
Wei B, Song H, Wang S, Kanai K, Katto J.
IEEE Access   7 51346-51356   2019年   [査読有り]
Takeuchi M, Sakamoto Y, Yokoyama R, Sun H, Matsuo Y, Katto J.
IEEE Access   7 80146-80158   2019年   [査読有り]
Sakamoto Y, Yokoyama R, Takeuchi M, Matsuo Y, Katto J.
2019 IEEE International Conference on Consumer Electronics, ICCE 2019      2019年   [査読有り]
Ogawa K, Kanai K, Nakamura K, Kanemitsu H, Katto J, Nakazato H.
2019 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2019   419-422   2019年   [査読有り]
Sakamoto Y, Saika S, Takeuchi M, Nagashima T, Cheng Z, Kanai K, Katto J, Wei K, Zengwei J, Wei X.
Proceedings - 2018 IEEE International Symposium on Multimedia, ISM 2018   139-142   2019年   [査読有り]
Suphakit Awiphan, Kanin Poobai, Kenji Kanai, Jiro Katto
2018 3rd International Conference on Computer and Communication Systems, ICCCS 2018   187-191   2018年9月
© 2018 IEEE. Named Data Networking (NDN) has been recently introduced as a new network architecture. The implementation of adaptive bit-rate video streaming on NDN is one of the most challenging tasks. The in-network caching feature of NDN could m...
Zhengxue Cheng, Heming Sun, Masaru Takeuchi, Jiro Katto
2018 Picture Coding Symposium, PCS 2018 - Proceedings   253-257   2018年9月
© 2018 IEEE. Image compression has been investigated as a fundamental research topic for many decades. Recently, deep learning has achieved great success in many computer vision tasks, and is gradually being used in image compression. In this pape...
Masaru Takeuchi, Shintaro Saika, Yusuke Sakamoto, Tatsuya Nagashima, Zhengxue Cheng, Kenji Kanai, Jiro Katto, Kaijin Wei, Ju Zengwei, Xu Wei
2018 Picture Coding Symposium, PCS 2018 - Proceedings   179-183   2018年9月
© 2018 IEEE. We introduce a perceptual video quality driven video encoding solution for optimized adaptive streaming. By using multiple bitrate/resolution encoding like MPEG-DASH, video streaming services can deliver the best video stream to a cli...
Zhengxue Cheng, Masaru Takeuchi, Kenji Kanai, Jiro Katto
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences   E101A 1557-1566   2018年9月
© 2018 The Institute of Electronics, Information and Communication Engineers. Image quality assessment (IQA) is an inherent problem in the field of image processing. Recently, deep learning-based image quality assessment has attracted increased at...
Zhengxue Cheng, Heming Sun, Masaru Takeuchi, Jiro Katto
   2018年7月
Image compression has been investigated for many decades. Recently, deep
learning approaches have achieved a great success in many computer vision
tasks, and are gradually used in image compression. In this paper, we develop
three overall compress...
Bo Wei, Kenji Kanai, Wataru Kawakami, Jiro Katto
IEICE Transactions on Communications   E101B 1612-1624   2018年7月
Copyright © 2018 The Institute of Electronics, Information and Communication Engineers. Throughput prediction is one of the promising techniques to improve the quality of service (QoS) and quality of experience (QoE) of mobile applications. To add...
Kenji Kanai, Sakiko Takenaka, Jiro Katto, Tutomu Murase
IEICE Transactions on Communications   E101B 1635-1644   2018年7月
Copyright © 2018 The Institute of Electronics, Information and Communication Engineers. Because mobile users demand a high quality and energyfriendly video delivery service that efficiently uses wireless resources, we introduce an energy-efficient...
Airi Sakaushi, Mayuko Okano, Kenji Kanai, Jiro Katto
IEEE Wireless Communications and Networking Conference, WCNC   2018-April 1-6   2018年6月
© 2018 IEEE. In recent years, the system using acoustic communication is increasing. However, because acoustic communication uses low frequency, transmission rate is lower than radio wave communication. In wireless communication, MIMO-OFDM is prop...
Zhengxue Cheng, Heming Sun, Masaru Takeuchi, Jiro Katto
   2018年4月
Image compression has been investigated as a fundamental research topic for
many decades. Recently, deep learning has achieved great success in many
computer vision tasks, and is gradually being used in image compression. In
this paper, we present...
Yohei Hasegawa, Yohei Hasegawa, Jiro Katto
IEICE Transactions on Communications   E101B 1045-1054   2018年4月
© 2018 The Institute of Electronics, Information and Communication Engineers. This paper proposes a transmission control protocol (TCP) for long distance high-speed wireless communications, including free-space optical communications (FSOC). Extre...
Shintaro Saika, Masaru Takeuchi, Yasutaka Matsuo, Jiro Katto
2018 IEEE International Conference on Consumer Electronics, ICCE 2018   2018-January 1-2   2018年3月
© 2018 IEEE. For 8K UHDTV video, which has high spatial resolution, CU size has large influence to encoding efficiency. In addition, a moving object with random motion has also a large impact on encoding efficiency of inter prediction. In this pap...
Masaru Takeuchi, Shintaro Saika, Yusuke Sakamoto, Yasutaka Matsuo, Jiro Katto
2018 IEEE International Conference on Consumer Electronics, ICCE 2018   2018-January 1-2   2018年3月
© 2018 IEEE. In this paper, we consider a color space conversion method from BT.709 used for current HDTV (High Definition Television) broadcast to BT.2020 that will be used for UHDTV (Ultra HDTV) broadcast, with lost color information restoration...
Keigo Ogawa, Kenji Kanai, Masaru Takeuchi, Jiro Katto, Toshitaka Tsuda
CCNC 2018 - 2018 15th IEEE Annual Consumer Communications and Networking Conference   2018-January 1-6   2018年3月
© 2018 IEEE. To provide energy-efficient (i.e., longer lifetime of sensors) and network-friendly (i.e., reducing network traffic) field sensing, we propose an edge-centric field monitoring system which applies efficient sensors and camera control....
Kentaro Imagane, Kenji Kanai, Jiro Katto, Toshitaka Tsuda, Hidenori Nakazato
CCNC 2018 - 2018 15th IEEE Annual Consumer Communications and Networking Conference   2018-January 1-4   2018年3月
© 2018 IEEE. As mobile multimedia services have significantly evolved and diversified with the spread of smartphones and Internet of Things (IoT) devices, low-delay multimedia cloud computing is the need of the hour. To address this demand, in thi...
Kenji Kanai, Keigo Ogawa, Masaru Takeuchi, Jiro Katto, Toshitaka Tsuda
IEICE Transactions on Communications   E101B 688-697   2018年3月
© 2018 The Institute of Electronics, Information and Communication Engineers. To reduce the backbone video traffic generated by video surveillance, we propose an intelligent video surveillance system that offers multi-modal sensor-based event dete...
Kenji Kanai, Kentaro Imagane, Jiro Katto
ITE Transactions on Media Technology and Applications   6 46-52   2018年1月
Copyright © 2018 by ITE Transactions on Media Technology and Applications (MTA). Recently, to provide a low-latency mobile computing platform, Mobile Edge Computing (MEC) is proposed. In this paper, we first summarized the feature capabilities of ...
Zhengxue Cheng, Masaru Takeuchi, Jiro Katto
Proceedings - 2017 IEEE International Symposium on Multimedia, ISM 2017   2017-January 77-82   2017年12月
© 2017 IEEE. In recent years, various approaches have been investigated towards blind image quality assessment (IQA) with high accuracy and low complexity. In this paper we develop a pre-saliency map based blind IQA method, which takes advantage o...
Tatsuya Nagashima, Kenji Kanai, Jiro Katto
Proceedings - 2017 IEEE International Symposium on Multimedia, ISM 2017   2017-January 453-458   2017年12月
© 2017 IEEE. The increasing demand of mobile applications has brought large amount of mobile traffic. To meet users' requirements for high-quality video delivery, it is an urgent task to provide fair-quality video delivery for various users and si...
Bo Wei, Wataru Kawakami, Kenji Kanai, Jiro Katto
Proceedings - 2017 IEEE International Symposium on Multimedia, ISM 2017   2017-January 374-375   2017年12月
© 2017 IEEE. Throughput prediction is one of good solutions to improve quality of mobile applications (e.g., YouTube or Netflix) for video streaming delivery services in mobile networks. This is because such applications require monitoring the net...
Tatsuya Nagashima, Kenji Kanai, Jiro Katto
2017 IEEE 6th Global Conference on Consumer Electronics, GCCE 2017   2017-January 1-2   2017年12月
© 2017 IEEE. In this paper, we evaluate QoS (Quality of Service) and QoE (Quality of Experience) characteristics of 2K and 4K video distribution using MPEG-DASH (Dynamic Adaptive Streaming over HTTP). Evaluation results conclude that smaller playo...
Airi Sakaushi, Kenji Kanai, Jiro Katto, Toshitaka Tsuda
2017 IEEE 6th Global Conference on Consumer Electronics, GCCE 2017   2017-January 1-2   2017年12月
© 2017 IEEE. In this paper, to provide high-quality and high-visibility surveillance, we introduce video surveillance system equipped image enhancement system. Because quality of enhanced image heavily depends on encoding characteristic, we evalua...
Wataru Kawakami, Kenji Kanai, Bo Wei, Jiro Katto
2017 IEEE 6th Global Conference on Consumer Electronics, GCCE 2017   2017-January 1-2   2017年12月
© 2017 IEEE. In this paper, we performed human moving pattern recognition using communication quality: cellular download throughputs, Received Signal Strength Indicators (RSSIs) and cellular base station IDs. We apply three machine learning algori...
Sakiko Takenaka, Kenji Kanai, Jiro Katto, Tsutomu Murase
2017 14th IEEE Annual Consumer Communications and Networking Conference, CCNC 2017   2017-January 1-4   2017年7月
© 2017 IEEE. Because mobile users demand high quality and energy-friendly video delivery service that efficiently uses wireless resources, we introduce a green video delivery system using moving route navigation and playout buffer control based on...
Rintaro Harada, Shintaro Saika, Masaru Takeuchi, Kenji Kanai, Jiro Katto, Yasutaka Matsuo
Proceedings - 2016 IEEE International Symposium on Multimedia, ISM 2016   111-112   2017年1月
© 2016 IEEE. In this study, we propose a broadcasting and communication integrated platform that can retransmit 8K broadcasting contents from a TV receiving set to mobile devices. We then evaluate the QoS characteristics and the qualities of 8K co...
Kentaro Imagane, Kenji Kanai, Jiro Katto, Toshitaka Tsuda
2016 IEEE 5th Global Conference on Consumer Electronics, GCCE 2016      2016年12月
© 2016 IEEE. In order to analyze system latency of edge computing for multimedia data processing, we propose a model of system latency of two different distributed processing scenarios: pipeline and parallel processing. We validate the model by us...
Shintaro Saika, Saki Takahashi, Masara Takeuchi, Jiro Katto
2016 IEEE 5th Global Conference on Consumer Electronics, GCCE 2016      2016年12月
© 2016 IEEE. Nowadays, researches on accident prevention using train-mounted cameras had been progressing. Our proposed method considers temporal continuity between frames by using motion vectors in addition to conventional thresholding on similar...
Xin Qi, Zheng Wen, Toshitaka Tsuda, Wataru Kameyama, Jiro Katto, Takuro Sato, Kouichi Shibata
2016 IEEE Globecom Workshops, GC Wkshps 2016 - Proceedings      2016年1月
© 2016 IEEE. Urban surveillance systems are being applied in a rapid pace with mature but inefficient solutions. The inefficiency is revealed with two aspects, too concentrated bandwidth and processing requirement. To solve this problem, we propos...
Yasutaka Matsuo, Yasutaka Matsuo, Ryoki Takada, Shinya Iwasaki, Jiro Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   68    2014年1月
Image super-resolution quality is degraded by the noise component of an image. However the noise should not be eliminated because of its importance in high-definition impression for digital cinema. We therefore propose an image super-resolution me...
Jiro Katto
ITE Transactions on Media Technology and Applications   2 298   2014年1月
Yasutaka Matsuo, Yasutaka Matsuo, Ryoki Takada, Shinya Iwasaki, Jiro Katto
Proceedings - 2013 IEEE International Symposium on Multimedia, ISM 2013   279-282   2013年12月
We propose a novel image super-resolution method from digital cinema to 8K ultra high-definition television using registration of wavelet multi-scale components with affine transformation. The proposed method features that an original image is div...
Masatsugu Ichino, Hiroki Kasahara, Hideki Yoshii, Kazuhiro Tsurumaru, Naohisa Komatsu, Jiro Katto
2013 IEEE/ACIS 12th International Conference on Computer and Information Science, ICIS 2013 - Proceedings   11-16   2013年10月
The use of mobile terminals has been expanding dramatically in recent years as they evolve from a means of dispatching and gathering information to a highly functional tool that supports personal lifestyles and behavior. A mobile terminal is likel...
Suphakit Awiphan, Zhou Su, Jiro Katto
ITE Transactions on Media Technology and Applications   1 70-80   2013年1月
Copyright © 2013 by ITE Transactions on Media Technology and Applications (MTA). Application-layer multicast has been considered as a promising method for streaming live media to users in P2P networks. However, the inefficient bandwidth utilizatio...
Kenji Kawamoto, Masatsugu Ichino, Mitsuhiro Hatada, Yusuke Otsuki, Hiroshi Yoshiura, Jiro Katto
Studies in Computational Intelligence   443 1-11   2013年1月
Applications and malware affecting them are dramatically changing. It isn't certain whether the currently used features can classify normal traffic or malware traffic correctly. In this paper, we evaluated the features used in previous studies whi...
Shintaro Funasawa, Hiromi Ishizaki, Keiichiro Hoashi, Yasuhiro Takishima, Jiro Katto
Proceedings of the 11th International Society for Music Information Retrieval Conference, ISMIR 2010   63-68   2010年12月
In this paper, we propose a system which automatically generates slideshows for music, by utilizing images retrieved from photo sharing web sites, based on query words extracted from song lyrics. The proposed system consists of two major steps: (1...
Suphakit Awiphan, Su Zhou, Jiro Katto
2009 International Conference on Information Networking, ICOIN 2009      2009年12月
In this paper, we introduce a new mesh-based approach for data delivery which is organized over multiple treeshaped core routes. Given that both tree and mesh approaches have their own strong points, we simply combine them together. We evaluate th...
Sayaka Akioka, Junichi Ikeda, Takanori Ueda, Yuki Ohno, Midori Sugaya, Yu Hirate, Jiro Katto, Shigeki Goto, Yoichi Muraoka, Hayato Yamana, Tatsuo Nakajima
Proceedings - 1st International Workshop on Software Technologies for Future Dependable Distributed Systems, STFSSD 2009   32-37   2009年12月
The total amount of information to process or analyze is jumping sharply with the quick spread of computers and networks. Our project, «Highly scalable monitoring architecture for information explosion», develops a monitoring system allows observi...
Keiichiro Hoashi, Shuhei Hamawaki, Hiromi Ishizaki, Yasuhiro Takishima, Jiro Katto
Proceedings of the 10th International Society for Music Information Retrieval Conference, ISMIR 2009   207-212   2009年12月
This research presents a formal user evaluation of a typical visualization method for content-based music information retrieval (MIR) systems, and also proposes a novel interface to improve MIR usability. Numerous interfaces to visualize content-b...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
International Journal of Innovative Computing, Information and Control   5 4275-4282   2009年11月
In order to deliver multimedia contents to the end-users with low delay and acceptable quality, the pre-fetching technologies have been shown the efficiency if we can predict user's future requests and prefetch the data needed previously. However,...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
International Journal of Innovative Computing, Information and Control   5 821-828   2009年3月
Recently it has been shown that scalable (layered) image is appropriate for the Internet because of its better flexibility and functionality. At the same time, the prefetching technology also proves to be an efficient method to improve the perform...
Keiichiro Hoashi, Kazunori Matsumoto, Fumiaki Sugaya, Hiromi Ishizaki, Jiro Katto
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings   5    2006年12月
This paper proposes a feature space modification method for feature extraction of music, which is effective for the development of a content-based music information retrieval (MIR) system based on user preferences. The proposed method conducts clu...
Jiro Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   60 163-164   2006年1月
Jiro Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   60 47-49   2006年1月
Yusuke Sakurai, Jiro Katto
2004 International Workshop on Wireless Ad-Hoc Networks   63-67   2005年12月
This paper proposes a novel on-demand multipath routing protocol for a mobile ad hoc network. By applying a newly developed route update procedure with combined metrics of delay, hop count and disjointness, each intermediate node deliberately sele...
Tetsuya Kusumoto, Yohei Kunichika, Yohei Kunichika, Jiro Katto, Sakae Okubo
Proceedings of the Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services, ICAS/ICNS 2005   2005 17   2005年12月
The purpose of this study is to maintain efficient backup routes for restoring overlay trees. In most conventional methods, after a node leaves the trees, its children start searching for a new parent. In this reactive approach, it takes a lot of ...
Kazuya Ueki, Hiromitsu Komatsu, Satoshi Imaizumi, Kenichi Kaneko, Satoshi Imaizumi, Nobuhiro Sekine, Jiro Katto, Tetsunori Kobayashi
Proceedings - International Conference on Pattern Recognition   4 446-449   2004年12月
This paper presents a method of gender classification by integrating facial, hairstyle, and clothing images. Initially, input images are separated into facial, hairstyle and clothing regions, and independently learned PCAs and GMMs based on thousa...
Haruki Izumikawa, Haruki Izumikawa, Ichiro Yamaguchi, Ichiro Yamaguchi, Jiro Katto
2004 IEEE Wireless Communications and Networking Conference, WCNC 2004   2 647-652   2004年9月
TCP is a popular internet protocol for reliable end-to-end data delivery, but it cannot he directly applied to wireless networks in which packet loss may be induced by higher HER or handover than congestion. TCP assumes that such packet loss is ca...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
IEICE Transactions on Information and Systems   E87-D 2723-2732   2004年1月
CDN (Content Delivery Networks) improves end-user performance by replicating web contents on a group of geographically distributed servers. However, repeatedly keeping the entire replica of the original objects into many content servers consumes t...
Kazuhisa Yamagisi, Jiro Katto, Yasuhiko Yasuda
Picture Coding Symposium   87-91   2003年12月
In this paper, we propose a motion vector search algorithm that employs the Sum of Absolute Difference (SAD) minimization in DCT domain as a distortion measure. In addition, block based motion estimation is carried out with multiple modes in this ...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
Proceedings of the 5th ACM SIGMM International Workshop on Multimedia Information Retrieval, MIR 2003   255-261   2003年11月
Copyright 2003 ACM. CDN (Content Delivery Networks) improves end-user performance by replicating web contents on a group of geographically distributed content servers. Replication Algorithm plays an important role in helping users to retrieve Web ...
Zhou Su, Teruyoshi Washizawa, Jiro Katto, Yasuhiko Yasuda
IEICE Transactions on Communications   E86-B 2753-2763   2003年1月
The efficient distribution of stored information has become a major concern in the Internet. Since the web workload characteristics show that more than 60% of network traffic is caused by image documents, how to efficiently distribute image docume...
Z. Su, Jiro Katto, Takayuki Nishikawa, Munetsugu Murakami, Yasuhiko Yasuda
IEICE Transactions on Communications   E86-B 1859-1869   2003年1月
With the advance of high-speed network technologies, availability and popularity of streaming media contents over the Internet has grown rapidly in recent years. Because of their distinct statistical properties and user viewing patterns, tradition...
Zhou Su, Jiro Katto, Takayuki Nishikawa, Munetugu Murakami, Teruyoshi Washizawa, Yasuhiko Yasuda
Proceedings of the First International Conference on Information Technology and Applications (ICITA 2002)   693-698   2002年12月
The emergence of the Internet as a pervasive communication medium has led to the rise of many applications of streaming media. However, because of their distinct statistical properties and user viewing patterns, traditional delivery and caching sc...
Zhou Su, Teruyoshi Washizawa, Jiro Katto, Yasuhiko Yasuda
IEEE Region 10 Annual International Conference, Proceedings/TENCON   2 786-790   2002年12月
The efficient distribution of stored information has become a major concern in the Internet. Since the web workload characteristics shows that more than 60% of network traffic is caused by image documents, how to efficiently distribute image docum...
Zhou Su, Teruyoshi Washizawa, Jiro Katto, Yasuhiko Yasuda
IEEE Region 10 International Conference on Electrical and Electronic Technology   370-376   2001年12月
This paper presents a cache scheme for image databases, web browsers, proxies and other similar applications in Internet. The current cache system employs a hard strategy: either the image is stored in a cache or not even its data is quite big. We...
J. Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   55 810   2001年6月
J. Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   55 622   2001年5月
J. Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   55 521   2001年4月
Hiroyuki Katata, Yoichi Yagasaki, Toshiaki Watanabe, Jiro Katto
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   53 485-491   1999年1月
Takahiro Kimoto, Jiro Katto, Mutsumi Ohta
IEEE International Conference on Image Processing   2 326-330   1998年12月
A new wavelet coding method is presented to exploit both intra/inter-band correlations. While the traditional zerotree approach can exploit correlation between subbands, a wavelet decomposition has properties more suitable for the runlength coding...
Atsushi Marugame, Jiro Katto, Mutsumi Ohta
IEEE International Conference on Image Processing   2 851-854   1996年12月
This paper presents a novel framework for structure recovery utilizing a scaled orthographic view and perspective views simultaneously. Perspective views lead to precise recovery based on the triangulation principle; however, many parameters such ...
Jiro Katto, Mutsumi Ohta
IEEE International Conference on Image Processing   2 863-866   1996年12月
This paper presents novel algorithms exploiting multiple camera inputs and segmentation techniques, which can be applied to image fusion, disparity detection and object extraction. Differently focused images, stereo pairs and both of them are used...
Fabrice Rossetti, Jiro Katto, Mutsumi Ohta
Signal Processing: Image Communication   8 365-378   1996年1月
This paper describes novel methods to improve coding efficiency of the wavelet transform from the viewpoint of scanning techniques. Firstly, statistical properties of the wavelet transform are examined using real image sequences. They indicate ene...
Jiro Katto, Mutsumi Ohta
IEEE International Conference on Image Processing   2 555-558   1996年1月
This paper presents mathematical frameworks on temporal predictive processing in the MPEG video compression standard. Firstly, a coding gain is derived based on traditional prediction theories. The optimum ordering of three different picture types...
Jiro Katto, Mutsumi Ohta
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings   4 2189-2192   1995年1月
This paper presents a novel framework which proves the superiority of overlapped motion compensation. Window design problem is revised by introducing a statistical model of motion estimation process. The result clarifies relationship between the o...
Jiro Katto, Jun Ichi Ohki, Satoshi Nogaki, Mutsumi Ohta
IEEE Transactions on Circuits and Systems for Video Technology   4 328-338   1994年1月
This paper describes theories on overlapped motion compensation and their applications to a wavelet codec aimed for very low bit-rate environment below 64 kb/s. The theories are concerned with the evaluation of prediction efficiency improved by ov...
Jiro Katto, Kunitoshi Komatsu, Yasuhiko Yasuda
Proceedings of SPIE - The International Society for Optical Engineering   1818 735-746   1992年12月
This paper presents a filter design algorithm in order to realize high efficient image codec system based on subband decomposition, and also describes unified frameworks to interpret various image coding techniques. First, various image coding tec...
Jiro Katto, Yasuhiko Yasuda
Proceedings of SPIE - The International Society for Optical Engineering   1605 95-106   1991年12月
In this paper, two analytical methods to evaluate coding performance of subband coding are proposed, and optimization of its filter coefficients from the viewpoint of energy compaction property is considered. The first method is based on matrix re...
Jiro Katto, Katsumasa Onda, Yasuhiko Yasuda
Signal Processing: Image Communication   3 313-320   1991年1月
One of the merits with the introduction of variable bit-rate coding to moving pictures is the constancy of picture quality. However, considering the fact that conventional SNR cannot reflect the result of subjective assessment sufficiently, other ...
Jiro Katto, Yasuhiko Yasuda
Journal of Visual Communication and Image Representation   2 303-313   1991年1月
In this paper, two analytical methods for evaluating the coding efficiency of subband coding are proposed, and optimization of filter coefficients of the perfect reconstruction FIR filter banks is considered, based on a new performance measure cal...
Jiro Katto, Yasuhiko Yasuda
Electronics and Communications in Japan (Part I: Communications)   73 52-62   1990年1月
As a promising means of realizing broadband ISDN, the ATM (asynchronous transfer mode), which is based on fast packet switching, is considered interesting. In video communication by ATM, the constancy and improvement of picture quality by variable...

Misc

 
Zhengxue Cheng, Heming Sun, Masaru Takeuchi, Jiro Katto
   2019年6月
In this paper, we provide a detailed description on our approach designed for
CVPR 2019 Workshop and Challenge on Learned Image Compression (CLIC). Our
approach mainly consists of two proposals, i.e. deep residual learning for
image compression an...
Zhengxue Cheng, Heming Sun, Masaru Takeuchi, Jiro Katto
   2019年6月
Compression has been an important research topic for many decades, to produce
a significant impact on data transmission and storage. Recent advances have
shown a great potential of learning image and video compression. Inspired from
related works,...
Zhengxue Cheng, Pinar Akyazi, Heming Sun, Jiro Katto, Touradj Ebrahimi
   2019年5月
Recently deep learning based image compression has made rapid advances with
promising results based on objective quality metrics. However, a rigorous
subjective quality evaluation on such compression schemes have rarely been
reported. This paper a...
Bo Wei, Kenji Kanai, Jiro Katto
2016 IEEE International Conference on Multimedia and Expo Workshop, ICMEW 2016      2016年9月
© 2016 IEEE. Throughput prediction contributes a lot to adaptive bitrate control, adjusting the quality of video streaming accordingly to offer smooth media transmission and save energy at the same time. To solve the problem of throughput predicti...
Kenji Kanai, Bo Wei, Zhengxue Cheng, Masaru Takeuchi, Jiro Katto
IEICE Transactions on Communications   E102B 1240-1247   2019年1月
Copyright © 2019 The Institute of Electronics, Information and Communication Engineers. This paper introduces recent trends in video streaming and four methods proposed by the authors for video streaming. Video traffic dominates the Internet as se...
Kenji Kanai, Takeshi Muto, Jiro Katto, Shinya Yamamura, Tomoyuki Furutono, Takafumi Saito, Hirohide Mikami, Kaoru Kusachi, Toshitaka Tsuda, Wataru Kameyama, Yong Jin Park, Takuro Sato
IEEE Journal on Selected Areas in Communications   34 2102-2114   2016年8月
© 1983-2012 IEEE. In order to provide high-quality and highly reliable video delivery services for mobile users, especially train passengers, we propose a proactive content caching scheme that uses transportation systems. In our system, we place c...
Bo Wei, Mayuko Okano, Kenji Kanai, Wataru Kawakami, Jiro Katto
2018 IEEE 7th Global Conference on Consumer Electronics, GCCE 2018   88-89   2018年12月
© 2018 IEEE. To ensure good quality of experience for user when transmitting video content, throughput prediction can contribute to the selection of proper bitrate. In this paper, we propose a throughput prediction method with recurrent neural net...
Masanori Kanda, Jiro Katto, Tutomu Murase
2016 13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016   335-338   2016年3月
© 2016 IEEE. With increase of mobile wireless LAN systems, frequency contamination by the overlapping basic service set (OBSS) becomes a critical issue. In this paper, we focus on HCF controlled channel access (HCCA) to alleviate the OBSS problem....
Zhengxue Cheng, Masaru Takeuchi, Kenji Kanai, Jiro Katto
2018 IEEE International Conference on Multimedia and Expo Workshops, ICMEW 2018      2018年11月
© 2018 IEEE. Image quality assessment (IQA) is an inherent research topic in image processing field for several decades. Recently, machine learning has achieved success in many multimedia tasks and can be applied in IQA. Especially, screen content...
Shota Orihashi, Rintaro Harada, Yasutaka Matsuo, Jiro Katto
Proceedings - 2015 IEEE International Symposium on Multimedia, ISM 2015   343-346   2016年3月
© 2015 IEEE. In this paper, we propose a method to control H.265/HEVC encoding for 8K UHDTV moving pictures by detecting amount or complexity of object motions. In 8K video, which has very high spatial resolution, motion has a big influence on enc...
Katsuhiko Hirao, Zhengxue Cheng, Masaru Takeuchi, Jiro Katto
9th International Conference on Information and Communication Technology Convergence: ICT Convergence Powered by Smart Intelligence, ICTC 2018   472-474   2018年11月
© 2018 IEEE. The popularity of high dynamic range (HDR) makes the inverse tone mapping become an important technique for HDR display. In this paper, we propose a convolutional neural network (CNN) based inverse tone mapping method to generate a hi...
Shota Orihashi, Rintaro Harada, Yasutaka Matsuo, Jiro Katto
2016 IEEE International Conference on Consumer Electronics, ICCE 2016   245-246   2016年3月
© 2016 IEEE. In this paper, we propose a method to improve H.265/HEVC encoding performance for 8K UHDTV moving pictures by detecting amount or complexity of object motions. In 8K video, which has high spatial resolution, motion has a big influence...
Wataru Kawakami, Kenii Kanai, Bo Wei, Jiro Katto
Proceedings - IEEE International Conference on Multimedia and Expo   2018-July    2018年10月
© 2018 IEEE. In order to recognize the transportation modes without any additional sensor devices, we propose a recognition method by using communication quality factors. In the proposed method, instead of Global Positioning System (GPS) and accel...
Sakiko Takenaka, Kenji Kanai, Jiro Katto
2015 IEEE 4th Global Conference on Consumer Electronics, GCCE 2015   541-542   2016年2月
© 2015 IEEE. Effective use of various wireless network interfaces is expected. In this paper, we evaluate Quality of Service characteristics of mobile 4K video using a radio communication quality map. We collect radio communication quality (e.g. t...
Airi Sakaushi, Kenji Kanai, Jiro Katto, Toshitaka Tsuda
2018 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018   651-656   2018年10月
© 2018 IEEE. In this paper, to sustain a high-quality 24-hour video surveillance (i.e., high reliability) and reduce redundant video traffic volume (i.e., network friendliness), we propose an edge-centric video surveillance system that provides fl...
Rintaro Harada, Kenji Kanai, Jiro Katto
2015 IEEE 4th Global Conference on Consumer Electronics, GCCE 2015   539-540   2016年2月
© 2015 IEEE. In this paper, we evaluate performances of 4K/2K video streaming using DASH-JS over 2.4/5GHz WiFi networks. We confirmed that fluctuation of reception quality was mainly caused by the minimum representation rate of MPEG-DASH contents ...
Suphakit Awiphan, Kanin Poobai, Jiro Katto
2018 22nd International Computer Science and Engineering Conference, ICSEC 2018      2018年7月
© 2018 IEEE. Adaptive rate video streaming on a novel Internet architecture, called Named Data Networking (NDN), appears to be a promising technology. However, given the source of content on NDN is unknown to the consumer, rate adaptation becomes ...
Suphakit Awiphan, Takeshi Muto, Zhou Su, Jiro Katto
2015 IEEE Conference on Standards for Communications and Networking, CSCN 2015   181-186   2016年1月
© 2015 IEEE. Content Centric Networking (CCN) has been emerged as a new networking paradigm. In CCN, adaptive video streaming is one of the most promising technologies. However, rate adaptation and outbound face selection are the primary concern s...
Kanin Poobai, Suphakit Awiphan, Jiro Katto
ACM International Conference Proceeding Series   75-80   2018年4月
© 2018 Association for Computing Machinery. Named Data Networking (NDN) has been recently introduced as a new future network architecture. The end-to-end throughput estimation for adaptive bit-rate video streaming on NDN is one of the most challen...
Yuya Ishizu, Kenji Kanai, Jiro Katto, Hidenori Nakazato, Marie Hirose
Proceedings - 2015 IEEE International Conference on Data Science and Data Intensive Systems; 8th IEEE International Conference Cyber, Physical and Social Computing; 11th IEEE International Conference on Green Computing and Communications and 8th IEEE Inte   318-324   2015年1月
© 2015 IEEE. In wireless networks, it is important to realize energy-efficient video delivery. To do this, we introduce energy-efficient video streaming over named data networking (NDN). In our proposed approach, we focus on two areas, namely, to ...
Bo Wei, Wataru Kawakami, Kenji Kanai, Jiro Katto, Shangguang Wang
2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings      2018年1月
© 2018 IEEE. Throughput prediction is essential for ensuring high quality of service for video streaming transmissions. However, current methods are incapable of accurately predicting throughput in mobile networks, especially for moving user scena...
Kenji Kanai, Konishi Hidenori, Yuya Ishizu, Jiro Katto
2015 12th Annual IEEE Consumer Communications and Networking Conference, CCNC 2015   677-682   2015年1月
© 2015 IEEE. Providing robust video streaming along with efficient wireless resource usage is necessary for mobile users, especially on subway, and mobile carriers. To achieve this, we propose a highly-reliable buffer strategy based on long-term t...
Kazumasa Ishikura, Aiko Uemura, Jiro Katto
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   8935 408-417   2015年1月
© Springer International Publishing Switzerland 2015. This paper presents a live version music identification system by modifying the conventional cover song identification system. The proposed system includes two stages: a live version identifica...
Kenji Kanai, Takeshi Muto, Jiro Katto, Wataru Kameyama, Yong Jin Park, Takuro Sato, Takafumi Saito, Hirohide Mikami, Kaoru Kusachi, Toshitaka Tsuda, Shinya Yamamura, Tomoyuki Furutono
2015 IEEE Globecom Workshops, GC Wkshps 2015 - Proceedings      2015年1月
© 2015 IEEE. Providing robust content delivery service, such as Video on Demand, with efficient wireless resource usage is important for mobile users. To achieve this, we have proposed a proactive content caching scheme utilizing transportation sy...
Ryoki Takada, Shota Orihashi, Yasutaka Matsuo, Jiro Katto
2015 IEEE International Conference on Consumer Electronics, ICCE 2015   58-59   2015年1月
© 2015 IEEE. Block-based Motion Estimation (ME) has been widely used in various video coding standards to remove temporal redundancy. However, this ME has limitation that it can only compensate for a parallel translation. Various methods have been...
Takeshi Muto, Kenji Kanai, Jiro Katto
2015 IEEE Wireless Communications and Networking Conference, WCNC 2015   2239-2244   2015年1月
© 2015 IEEE. Proactive content caching scheme utilizing transportation systems, especially on trains, was proposed in order to provide a robust content delivery with efficient wireless resource usage. This system requires content servers with NDN ...
Jun Ichi Kimura, Naohisa Komatsu, Jiro Katto, Mei Kodama
ITE Transactions on Media Technology and Applications   3 58-66   2015年1月
© 2015 by ITE Transactions on Media Technology and Applications (MTA). An accurate (reliable) motion estimation (ME) algorithm using block matching for sequences including spatially periodic patterns is proposed and evaluated in comparison to conv...
Masatsugu Ichino, Hiroshi Yoshiura, Jiro Katto
2015 IEEE International Conference on Consumer Electronics, ICCE 2015   118-119   2015年1月
© 2015 IEEE. A system is proposed that uses content-centric networking to deliver content to mobile users. It uses sensor data obtained from the device they are using to identify their means of transport. The content is then delivered in a manner ...
Ryo Kato, Jiro Katto
2015 IEEE Wireless Communications and Networking Conference, WCNC 2015   1753-1758   2015年1月
© 2015 IEEE. In recent years, researches of underwater sensor networks have continued to investigate environment and resources of the sea. Acoustic waves are used instead of radio waves for wireless communication in underwater. However, dedicated ...
Hiroto Kisara, Sayo Kurokawa, Kenji Kanai, Jiro Katto
2015 IEEE Globecom Workshops, GC Wkshps 2015 - Proceedings      2015年1月
© 2015 IEEE. In order to tackle recent mobile traffic explosion, content offloading using Wifi access points from cellular network is deployed but the Wifi system itself is sometimes heavily congested. In this paper, we propose a content offloadin...
Daiki Aoki, Sakiko Takenaka, Kenji Kanai, Jiro Katto, Hidenori Nakazato, Marie Hirose
Proceedings - 2015 IEEE International Conference on Data Science and Data Intensive Systems; 8th IEEE International Conference Cyber, Physical and Social Computing; 11th IEEE International Conference on Green Computing and Communications and 8th IEEE Inte   390-395   2015年1月
© 2015 IEEE. Information Centric Networking (ICN) is a new networking paradigm in which the network provides users with named content, instead of communication channels between hosts. However, many issues, such as naming, routing, resource control...
Kenji Kanai, Takeshi Muto, Hiroto Kisara, Jiro Katto, Toshitaka Tsuda, Wataru Kameyama, Yong Jin Park, Takuro Sato
2014 IEEE Global Communications Conference, GLOBECOM 2014   1382-1387   2014年2月
© 2014 IEEE. Providing robust content delivery along with efficient wireless resource usage is important for next generation wireless networks. To achieve this, we propose a proactive content caching scheme utilizing transportation systems, especi...
Aiko Uemura, Kazumasa Ishikura, Jiro Katto
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   8326 LNCS 345-352   2014年2月
Feature analysis of audio compression is necessary to achieve high accuracy in musical content recognition and content-based music information retrieval (MIR). Bit rate differences are expected to adversely affect musical content analysis and cont...
Chihiro Noguchi, Jiro Katto, Kenji Ohyama
2014 IEEE 3rd Global Conference on Consumer Electronics, GCCE 2014   221-222   2014年2月
© 2014 IEEE. Height data is very important not only as an indicator of growth in low birth weight infants, newborn, infants (infants below), but also for early detection of disease such as dwarfism. In this paper, we consider height estimation by ...
Ryoki Takada, Jiro Katto
2014 IEEE 3rd Global Conference on Consumer Electronics, GCCE 2014   416-418   2014年2月
© 2014 IEEE. Traffic sign recognition contributes to the safety of drivers and people around the car. The system analyzes the road ahead images taken by on-vehicle camera, but blurred and distorted images make it difficult to recognize correct tra...
Kenji Kanai, Hidenori Konishi, Jiro Katto, Tutomu Murase
2014 IEEE 3rd Global Conference on Consumer Electronics, GCCE 2014   547-548   2014年2月
© 2014 IEEE. Extending battery life for smartphones while using wireless networks is important. In this paper, we propose Comfort Route for Energy Saving (CRFES), which helps users extend the battery life of their smartphones by navigating to thei...
Hidenori Konishi, Kenji Kanai, Jiro Katto
2014 IEEE 3rd Global Conference on Consumer Electronics, GCCE 2014   749-750   2014年2月
© 2014 IEEE. With the increasing demand for video streaming in mobile environment, we have been tackling a research on throughput prediction based on the measurement history data in order to improve service quality[1][2]. Since throughput fluctuat...
Takahiro Kumekawa, Masahiro Wakabayashi, Jiro Katto, Naofumi Wada
ITE Transactions on Media Technology and Applications   2 353-361   2014年1月
© 2014 by ITE Transactions on Media Technology and Applications (MTA). The peak signal-to-noise ratio (PSNR) used as an index of image quality usually requires original images, but this is difficult for consumer generated content such as videos on...
Tutomu Murase, Gen Motoyoshi, Kazuhide Sonoda, Jiro Katto
ITE Transactions on Media Technology and Applications   2 345-352   2014年1月
© 2014 by ITE Transactions on Media Technology and Applications (MTA). It is important for multimedia mobile users to obtain sufficient resources and a stable capacity of resources. Network resources such as available bandwidth for mobile users, h...
Shinya Iwasaki, Ryoki Takada, Yasutaka Matsuo, Yasutaka Matsuo, Jiro Katto
Digest of Technical Papers - IEEE International Conference on Consumer Electronics   105-106   2014年1月
In recent years, video sequence with a depth map can be taken by a camera with RGB-D (depth) sensor like Kinect. On the other hand, quality degradation at occluded regions is inevitable when conventional 2-D video coding is applied. In this paper,...
Kenji Kanai, Jiro Katto, Tutomu Murase
ITE Transactions on Media Technology and Applications   2 327-335   2014年1月
© 2014 by ITE Transactions on Media Technology and Applications (MTA). To improve Quality of Service in wireless networks while mobile users travel, we introduce Comfort Route Navigation (CRN) which is a navigation system based on a user centric m...
Kenji Kanai, Jiro Katto, Tutomu Murase
APNOMS 2014 - 16th Asia-Pacific Network Operations and Management Symposium      2014年1月
© 2014 IEEE. Improving Quality of Service (QoS) in wireless networks is important and necessary for mobile users. We have previously proposed Comfort Route (CR) Navigation, which navigates users to their destinations using high QoS communication a...
Haruki Izumikawa, Jiro Katto
IEEE Wireless Communications and Networking Conference, WCNC   2196-2201   2013年8月
We present a robust cellular network (RoCNet) that combines a cellular and an opportunistic networks for spatial uplink mobile data offloading, which focuses on the spatial difference of the traffic load among areas (e.g., business district and re...
Suphakit Awiphan, Takeshi Muto, Yu Wang, Zhou Su, Jiro Katto
2013 Computing, Communications and IT Applications Conference, ComComAp 2013   19-24   2013年8月
Most network applications nowadays are related to the distribution of contents from a source to a number of users. Several developments such as CDN and P2P networking have been used to provide access to contents at the network edges. However, they...
Yasutaka Matsuo, Yasutaka Matsuo, Shinya Iwasaki, Yuta Yamamura, Jiro Katto
Digest of Technical Papers - IEEE International Conference on Consumer Electronics   159-160   2013年4月
Quality of image super-resolution (SR) degrades by noise component. However it should not be eliminated because it is important for high definition impression for digital cinema. Therefore we propose an image SR method by synthesis of resolution-e...
Yuta Yamamura, Shinya Iwasaki, Yasutaka Matsuo, Yasutaka Matsuo, Jiro Katto
Digest of Technical Papers - IEEE International Conference on Consumer Electronics   494-495   2013年4月
Objective picture quality measures cannot estimate the effect of blocking artifacts caused by video compression sufficiently. In this paper, we apply cepstrum analysis to quantify the blocking artifacts. We show experimental results for some test ...
Kazumine Ogura, Jiro Katto, Mineo Takai
2013 IEEE 10th Consumer Communications and Networking Conference, CCNC 2013   745-748   2013年4月
In vehicle-to-vehicle communication, a message named BSM (Basic Safety Message) has a major role to inform a driver about surrounding condition. A vehicle periodically sends the BSM which includes the information of itself. Traffic load issues cau...
Kazuhide Sonoda, Kazumine Ogura, Jiro Katto
2013 IEEE 10th Consumer Communications and Networking Conference, CCNC 2013   753-756   2013年4月
This paper presents a TCP differentiation based on TCP version identification and IEEE 802.11e EDCA for low delay multimedia streaming over wireless LAN. It has been known that delay-based TCP can achieve low delay transport as long as it does not...
Yohei Nemoto, Kazumine Ogura, Jiro Katto
2013 IEEE 10th Consumer Communications and Networking Conference, CCNC 2013   178-183   2013年4月
This paper presents an RTT-fair TCP congestion control using ACK interval measurement and extends the approach to have inter-protocol friendliness, especially with CUBIC TCP. In the previous RTT-fair TCP congestion control, including ours, estimat...
Tutomu Murase, Gen Motoyoshi, Kzuhide Sonoda, Jiro Katto
Proceedings of the 7th International Conference on Ubiquitous Information Management and Communication, ICUIMC 2013      2013年4月
Network resources for mobile users such as available bandwidth fluctuate depending on the level of background traffic. The deployment of many access points enables mobile users to access more network resources on their way to their destination by ...
Suphakit Awiphan, Zhou Su, Jiro Katto
ITE Transactions on Media Technology and Applications   1 167-177   2013年1月
© 2013 by ITE Transactions on Media Technology and Applications (MTA). In Peer-to-Peer (P2P) networks, an incentive mechanism is a necessary component to deal with the free-riding behavior. The challenge is that direct reciprocal incentives; e.g.,...
Kazuhisa Yamagishi, Taichi Kawano, Takanori Hayashi, Jiro Katto
IEICE Transactions on Communications   E96-B 410-418   2013年1月
Three-dimensional (3D) video service is expected to be introduced as a next-generation television service. Stereoscopic video is composed of two 2D video signals for the left and right views, and these 2D video signals are encoded. Video quality b...
Aiko Uemura, Jiro Katto, Kyota Higa, Masumi Ishikawa, Toshiyuki Nomura
Proceedings - 2012 IEEE International Symposium on Multimedia, ISM 2012   32-35   2012年12月
This paper presents a music part detection method incorporating chroma vector analysis for use with music TV programs. Results show that envelopes of chroma components of music signals tend to have horizontal (i.e. temporal) correlation in time-fr...
Yasutaka Matsuo, Yasutaka Matsuo, Shinya Iwasaki, Yuta Yamamura, Jiro Katto
2012 IEEE Visual Communications and Image Processing, VCIP 2012      2012年12月
We propose a novel wavelet domain image super-resolution method from digital cinema to ultrahigh definition television considering cinema noise component. The proposed method features that spatial resolution of an original image is expanded by syn...
Tomoaki Yamazaki, Tetsuya Fujikawa, Jiro Katto
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings   945-948   2012年10月
Feature extraction of images can be applied to image matching, image searching, object recognition, image tracking etc. One of the effective methods to extract features of images is Scale-Invariant Feature Transform (SIFT) [1], In this paper, we i...
Aiko Uemura, Jiro Katto
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings   449-452   2012年10月
This paper presents a chord recognition method from music signals using chroma vectors and musical knowledge known as "Doubly Nested Circle of Fifths (DNCOF)". DNCOF represents the relationships of major and minor chords where the neighboring two ...
Masaru Takeuchi, Yasutaka Matsuo, Yasutaka Matsuo, Yuta Yamamura, Jiro Katto, Kazuhisa Iguchi
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings   1373-1376   2012年10月
Bit-depth scalable coding method is an approach that generates multiplexed bit-streams that can be decoded to two video sequences, for Standard Dynamic Range (SDR) environment and for High Dynamic Range (HDR) environment. This paper presents a bit...
Haruki Izumikawa, Suphakit Awiphan, Jiro Katto
Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM   33-38   2012年9月
The growing popularity of mobile data communication has been leading a growing lack of radio resource on a cellular network. Therefore, to avoid the data traffic from exceeding the capacity limit of a cellular base station (BS), cellular operators...
Suphakit Awiphan, Zhou Su, Jiro Katto
2012 19th International Packet Video Workshop, PV 2012   13-18   2012年8月
In Peer-to-Peer (P2P) networks, a great number of peers are reluctant to contribute to the system. An incentive mechanism thus becomes a necessary component to motivate the cooperation of peers. Moreover, due to the continuous nature of data trans...
Kenji Kanai, Yuri Akamatsu, Jiro Katto, Tutomu Murase
2012 IEEE International Conference on Pervasive Computing and Communications Workshops, PERCOM Workshops 2012   419-422   2012年6月
Previous our research has introduced an optimal longcut route problem and a number of solutions to this problem. However, to date, the literature has only presented evaluations based on a single theoretical radio propagation model. Because through...
Kazumine Ogura, Yohei Nemoto, Zhou Su, Jiro Katto
IEICE Transactions on Information and Systems   E95-D 523-531   2012年1月
This paper focuses on RTT-fairness of multiple TCP flows over the Internet, and proposes a new TCP congestion control named "HRF (Hybrid RTT-Fair)-TCP". Today, it is a serious problem that the flows having smaller RTT utilize more bandwidth than o...
Kazumine Ogura, Zhou Su, Jiro Katto
2010 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2010      2010年12月
This paper proposes a new TCP congestion control supporting loss-fairness, which also contributes to improving RTT fairness. It has been well known that smaller RTT flows grab more bandwidth than larger ones when they compete on the shared link. T...
Zhou Su, Pinyi Ren, Rongtao Xu, Jiro Katto, Yasuhiko Yasuda
IEEE Vehicular Technology Conference      2010年12月
With the development of recent vehicular communication technologies, distributing multimedia contents in the vehicular communication networks (VCNs) has become more and more popular, to provide conveniences and entertainment services during the ti...
Suphakit Awiphan, Zhou Su, Jiro Katto
PV 2010 - 2010 18th International Packet Video Workshop   118-125   2010年12月
Service capacity and contribution of the peers have been proven to be the important factors for selecting a serving peer in the P2P overlay networks. In this paper, we study how to design a multi-parent overlay network in a contribution aware mann...
Tomoki Fujikawa, Yosuke Takishima, Hiroyuki Ujikawa, Kazumine Ogura, Jiro Katto, Haruki Izumikawa
PV 2010 - 2010 18th International Packet Video Workshop   134-141   2010年12月
This paper presents a hybrid congestion control algorithm supporting throughput efficiency, TCP friendliness and RTT fairness, in order to provide highly smart multimedia streaming over the Internet. Recent studies on TCP and TFRC are evolving to ...
Zhou Su, Masato Oguro, Yohei Okada, Jiro Katto, Sakae Okubo
IEEE Transactions on Consumer Electronics   56 1957-1962   2010年8月
With the development of broadband technologies, more and more multimedia contents such as video or bulk file are being distributed over the Internet. However, an important issue to be resolved is how to construct an efficient overlay to provide us...
Zhou Su, Suphakit Awiphan, Kazumine Ogura, Jiro Katto, Yasuhiko Yasuda
2010 7th IEEE Consumer Communications and Networking Conference, CCNC 2010      2010年4月
The hybrid Application Layer Multicast (ALM) has been shown its efficiency by leveraging the conventionally main structures of application layer multicast, tree-based and mesh-based. However, how to select the proper node to construct the overlay ...
Suphakit Awiphan, Zhou Su, Jiro Katto
2010 7th IEEE Consumer Communications and Networking Conference, CCNC 2010      2010年4月
In this paper, we introduce a hybrid approach for overlay construction and data delivery in an application-layer multicast. We combine the strong points of a tree-based structure and a mesh-based data delivery to form ToMo, a two-layer hybrid over...
Suphakit Awiphan, Su Zhou, Jiro Katto
Proceedings of the 2009 IEEE International Symposium on Object/Component/Service-Oriented Real-Time Distributed Computing, ISORC 2009   181-187   2009年11月
In this paper, we introduce a new mesh-based approach for data delivery which is organized over multiple tree-shaped core routes. Given that both tree and mesh approaches for multicast overlay construction have their own strong points, we simply c...
Kazumine Ogura, Tomoki Fujikawa, Su Zhou, Jiro Katto
2009 IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR 2009      2009年10月
This paper presents TCP-Fusion supporting RTT (Round Trip Time) fairness in addition to throughput efficiency and friendliness to TCP-Reno. When multiple TCP flows having different RTT values compete, more bandwidth is unfairly allocated to the fl...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
IEEE Wireless Communications and Networking Conference, WCNC      2009年9月
With the growing use of dynamic content by mobile content distribution systems, how to manage dynamically changing files has become an important issue, since the cached replicas on different mobile sites must be updated if the originals have been ...
Zhou Su, Masato Oguro, Yohei Okada, Jiro Katto, Sakae Okubo
2009 6th IEEE Consumer Communications and Networking Conference, CCNC 2009      2009年4月
Awiphan Suphakit, Su Zhou, Katto Jiro
電子情報通信学会ソサイエティ大会講演論文集   2010(2) "S-65"-"S-66"   2010年8月
The presence of free-riding peers has been known as a serious threat in the peer-to-peer networks as it may lead to the degradation of overall service quality. In this paper, we study a method to construct the push-based multicast overlay in a con...
Shuhei Hamawaki, Shintaro Funasawa, Jiro Katto, Hiromi Ishizaki, Keiichiro Hoashi, Yasuhiro Takishima
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   5371 LNCS 298-309   2009年2月
In order to achieve highly accurate content-based music information retrieval (MIR), it is necessary to compensate the various bit rates of encoded songs which are stored in the music collection, since the bit rate differences are expected to appl...
Takahito Inoshita, Jiro Katto
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)   5371 LNCS 287-297   2009年2月
This paper presents a novel key estimation method of sound sources based on the music theory known as "circle of fifths". We firstly overview music theory and formulate the musical key analysis by vector operations. In detail, we separate music so...
Jiro Katto, Kazumine Ogura, Yuki Akae, Tomoki Fujikawa, Kazumi Kaneko, Su Zhou
GLOBECOM - IEEE Global Telecommunications Conference   1387-1392   2008年12月
This paper presents simple analytical models of hybrid TCP congestion controls, which switch loss-based mode and delay-based mode adaptively, and tries their performance tuning. We firstly present ideal behavior models of three kinds of TCP conges...
Zhou Su, Jiro Katto, Yasuhiko Yasuda, Yu Chen
3rd International Conference on Communications and Networking in China, ChinaCom 2008   1130-1134   2008年12月
With the development whereby mobile content distribution systems can manage dynamically changing files, an important issue to be resolved is consistency management, which means the cached replicas on different mobile sites must be updated if the o...
AWIPHAN Suphakit, SU Zhou, KATTO Jiro
全国大会講演論文集   72(0) 103-104   2010年3月
In this paper, we introduce a hybrid approach for overlay construction in an application-layer multicast and its application to a distributed data center management. We combine the good features of a tree-based structure and a mesh-based data deli...
Jiro Katto, Junya Suzuki, Shusei Itagaki, Shinichi Sakaida, Kazuhisa Iguchi
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings   1393-1396   2008年9月
This paper presents a denoising method of intra-coded pictures using motion estimation and pixel shift. Firstly, we show that pixel-aligned mixture of distorted images which are spatially shifted and differently encoded brings reduction of quantiz...
Su Zhou, Awiphan Suphakit, 甲藤 二郎, YASUDA Yasuhiko
電子情報通信学会技術研究報告. NS, ネットワークシステム   109(448) 497-500   2010年2月
To improve driving comfort and provide entertainment services, vehicular communication networks (VCDNs) have appeared as an emerging solution, which consists of road-side units (RSUs) and on-board units (OBUs) to distribute multimedia contents. Ho...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
International Journal of Innovative Computing, Information and Control   3 1743-1754   2007年12月
A robust replication algorithm is very important to retrieve Web objects from the Content delivery network (CDN), where both the network topology and Web access are changed dynamically. However, current replica strategies in CDN are to statically ...
Zhou Su, Jiro Katto, Yasuhiko Yasuda, Yasuhiko Yasuda
IEEE International Conference on Communications   1728-1733   2007年12月
Content Delivery Overlays improves end-user performance by replicating Web contents on a group of geographically distributed sites interconnected over the Internet. However, with the development whereby overlay systems can manage dynamically chang...
Tetsuya Kusumoto, Su Zhou, Jiro Katto, Sakae Okubo
PACKET VIDEO 2007 - 16th International Packet Video Workshop      2007年12月
The purpose of this study is to construct a robust and stable overlay tree of ALM (Application Layer Multicast) for real-time video transmission. Firstly, we propose a proactive route maintenance which enables fast recovery of the overlay tree aga...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
Proceedings - 9th IEEE International Symposium on Multimedia, ISM 2007   291-295   2007年12月
With the development whereby mobile content distribution systems can manage dynamically changing files, an important issue to be resolved is consistency management, which means the cached replicas on different mobile sites must be updated if the o...
Zhou Su, Masato Oguro, Jiro Katto, Yasuhiko Yasuda
IEICE Transactions on Communications   E90-B(10) 2729-2737   2007年1月
Content delivery network improves end-user performance by replicating Web contents on a group of geographically distributed sites interconnected over the Internet. However, with the development whereby content distribution systems can manage dynam...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
IEEE 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE   171-173   2006年12月
This paper is to design an integrated consistency-control algorithm for mobile contents delivery network (M-CDN) to enhance the efficient utilization of network resource and support the client mobility. Firstly, by carrying out an analysis of mobi...
Su Zhou, Suphakit Awiphan, Katto Jiro, Yasuda Yasuhiko
電子情報通信学会ソサイエティ大会講演論文集   2008(2) "S-150"-"S-151"   2008年9月
This paper is to design an integrated consistency-control algorithm for mobile contents delivery network (M-CDN) to enhance the efficient utilization of network resource and support the client mobility. Firstly, by carrying out an analysis of mobi...
Yusuke Ikeda, Sakae Okubo, Jiro Katto, Kenta Kimura
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers   60 1789-1795   2006年11月
The current video switching/composition scheme employed is fundamentally subject to a variable delay of 0-1 frame at each stage due to the use of a frame synchronizer. We can fix and minimize this variable delay by controlling the video sync phase...
SU Zhou, TAKAGI Kunitaka, SUPHAKIT Awiphan, KATTO Jiro, YASUDA Yasuhiko
電子情報通信学会総合大会講演論文集   2008(2)    2008年3月
Kenta Taniyama, Takeshi Morii, Shinya Koizumi, Kazuhiro Noguchi, Yukihiro Kotani, Jiro Katto
Journal of Zhejiang University: Science   7 145-150   2006年5月
We propose an on-demand multipath routing algorithm in a mobile ad hoc network for video transmission and evaluate its real world performance in video streaming application. There have been a number of multipath routing protocols extended from AOD...
Tetsuya Kusumoto, Jiro Katto, Sakae Okubo
IEICE Transactions on Information and Systems   E89-D 2856-2866   2006年1月
The purpose of this study is to maintain efficient backup routes for reconstructing overlay trees quickly. In most conventional methods, after a node leaves the trees, its child nodes start searching for the new parents. In this reactive approach,...
Su Zhou, Jiro Katto, Yasuhiko Yasuda
Proceedings - IEEE International Conference on Cluster Computing, ICCC      2005年12月
Su Zhou, Kusumoto Tetsuya, Takagi Kunitaka, Katto Jiro, Yasuda Yasuhiko
電子情報通信学会総合大会講演論文集   2007(2) "S-103"-"S-104"   2007年3月
This paper is to design an integrated consistency-control algorithm for mobile contents delivery network (M-CDN) to enhance the efficient utilization of network resource and support the client mobility. Firstly, by carrying out an analysis of mobi...
Kazumi Kaneko, Jiro Katto
Proceedings of the Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services, ICAS/ICNS 2005   2005 15   2005年12月
TCP Reno versions are widely used in current network, however it has been actualized that their throughput deteriorates in high-speed network and wireless environments. To overcome these problems of TCP Reno versions, a number of protocols have be...
Yohei Okada, Masato Oguro, Jiro Katto, Sakae Okubo
Proceedings of the Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services, ICAS/ICNS 2005   2005 12   2005年12月
This paper presents a novel approach for efficient tree construction in ALM (Application Layer Multicast) using layered video coding. This system is suitable for the users in heterogeneous environment such as xDSL and CATV, where upload and downlo...
Zhou Su, Jiro Katto, Yasuda Yasuhiko
Proceedings - IEEE International Conference on Cluster Computing, ICCC      2005年12月
Content Distribution Overlays improves end-user performance by replicating Web contents on a group of geographically distributed sites interconnected over the Internet. However, with the development whereby overlay systems, can manage dynamically ...
Zhou Su, Jiro Katto, Yasuhiko Yasuda
Proceedings of the Joint International Conference on Autonomic and Autonomous Systems and International Conference on Networking and Services, ICAS/ICNS 2005   2005 64   2005年12月
Content Distribution Overlays improves end-user performance by replicating Web contents on a group of geographically distributed sites interconnected over the Internet. However, with the development whereby overlay systems can manage dynamically c...
Tetsuya Kusumoto, Yohei Kunichika, Yohei Kunichika, Jiro Katto, Sakae Okubo
P2PMMS 2005 - Proceedings of the ACM Workshop on Advances in Peer-to-Peer Multimedia Streaming, co-located with ACM Multimedia 2005   49-58   2005年11月
© 2005 ACM. The purpose of this study is to maintain efficient backup routes for reconstructing overlay trees quickly. In most conventional methods, after a node leaves the trees, its children start searching for a new parent. In this reactive app...
KOIZUMI Shinya, TANIYAMA Kenta, MORII Takeshi, KOTANI Yukihiro, NOGUCHI Kazuhiro, KATTO Jiro
電子情報通信学会総合大会講演論文集   2006(2) "SE-23"-"SE-24"   2006年3月
Yohei Okada, Masato Oguro, Jiro Katto, Sakae Okubo
P2PMMS 2005 - Proceedings of the ACM Workshop on Advances in Peer-to-Peer Multimedia Streaming, co-located with ACM Multimedia 2005   59-68   2005年11月
© 2005 ACM. This paper presents a novel approach for efficient tree construction in ALM (Application Layer Multicast) using layered video coding. This mechanism is suitable for the users in heterogeneous environment such as xDSL and CATV, where up...

書籍等出版物

 
IT Text: インターネットプロトコル
分担
オーム社   2005年10月   
ディジタル放送教科書
分担
IDGジャパン   2003年2月   
H.323/MPEG-4教科書
分担
IEインスティチュート   2001年4月   

競争的資金等の研究課題

 
マルチメディア情報検索
次世代情報ネットワーク
次世代画像符号化
世界最高水準のモバイルICT環境を実現する次世代情報通信基盤と応用実証
科学研究費助成事業(早稲田大学): 科学研究費助成事業(基盤研究(A))
ソフトウェア無線・音響統合プラットフォームの開発と動画像配信実験
科学研究費助成事業(早稲田大学): 科学研究費助成事業(挑戦的萌芽研究)

特許

 
佐藤 拓朗, 津田 俊隆, 亀山 渉, 甲藤 二郎, フェンテス ナカリノ ハイロ エドアルド ロペス
朴 容震, 佐藤 拓朗, 津田 通隆, 甲藤 二郎, 金子 大希, 亀山 渉
山田 一久, 南 勇貴, 津田 俊隆, 佐藤 拓朗, 亀山 渉, 甲藤 二郎
甲藤 二郎, 佐藤 拓朗, 津田 俊隆, 亀山 渉, 金井 謙治