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Members

Name

OKAMOTO, Jun

Publication

[Journals]

  1. Seiichiro HANGAI,Jun Okamoto and Kazuhiro Miyauchi, "Improvement in Picture Evaluation Measure WSNR for Monochrome Still Picture Considering Local Entropy," ITE, Vol.49,No.8,pp.1078-1086,1995.
  2. Jun Okamoto, Takanori Hayashi, Akira Takahashi, and Takaaki Kurita, "Proposal for an Objective Video Quality Assessment Method that Takes Temporal and Spatial Information into Consideration,'' IEICE Trans. on Commun.,,Vol.J88-B, No.4, pp. 813-823, April 2005.
  3. Takanori Hayashi, Ginga Kawaguchi, Jun Okamoto, and Akira Takahashi, "Subjective Quality Estimation Model for Video Streaming Services with Dynamic Bit-Rate Control," IEICE Trans. on Commun., Vol.E89-B No.2 pp.297-303, Feb. 2006.
  4. Keishiro Watanabe, J. Okamoto, and Takaaki Kurita, "An Objective Video Quality Assessment Method for Freeze Distortion in Video Communication Services, " IEICE Trans. on Commun., Vol.J90-B, No.10, pp. 1036-1044, Oct. 2007.
  5. Kazuhisa Yamagishi, Jun Okamoto, Takanori Hayashi, and Akira Takahashi, "No Reference Video-Quality-Assessment Model for Monitoring Video Quality of IPTV Services," IEICE Trans. Commun. Vol.E95-B, No.2, pp.435-448, Feb. 2012.
  6. Toshiko Tominaga, Masataka Masuda, Jun Okamoto, Akira Takahashi, and Takanori Hayashi, "Performance Comparisons of Subjective Quality Assessment Methods for Video," IEICE Trans. Commun. Vol.E97-B, No.1, Jan. 2014.
  7. N. Egi, J. Okamoto, A. Takahashi , T. Hayashi, "Subjective test method for quantifying speaker identification accuracy of bandwidth-limited speech," IEICE Communications Express, Vol. 5, No. 10, pp. 387-393, 2016.

[International Conferences]

  1. Jun Okamoto,Seiichiro HANGAI,Kazuhiro MIYAUCHI,``A Study on Subjective and Objective Evaluation Method for Coded Moving Picture Quality,'' Proc. of PCS'96, Vol.2, pp.519-523,Mar. 1996.
  2. Jun Okamoto, Takanori Hayashi, Akira Takahashi, Takaaki Kurita "An Objective Quality Assessment Method For Arbitrary Video Streams," Proc. of PCS2004, Dec. 2004.
  3. Jun Okamoto, Takanori Hayashi, Akira Takahashi, Takaaki Kurita "Verification of Objective Quality Assessment Method for Arbitrary Video Streams," Proc. of IMQA2005, pp. 186-190 Sept. 2005.
  4. Keishiro Watanabe, Jun Okamoto and Takaaki Kurita, "Objective video quality assessment method for freeze distortion based on freeze aggregation," Proc. of SPIE, Image quality and system performance III , Proc. Vol., 6059, Jan. 2006.
  5. Keishiro Watanabe, Jun Okamoto and Takaaki Kurita, "Objective video quality assessment method for evaluating effects of freeze distortion in arbitrary video scenes," Proc. of SPIE, Image Quality and System Performance IV, Proc. Vol., 6494, Jan. 2007.
  6. Jun Okamoto, Keishiro Watanabe, Takaaki Kurita "Objective Video Quality Assessment Method for Video Streams Spatially Distorted by Coding and Packet Loss," Proc. of SIP, 576-091, pp.271-276, Aug. 2007.
  7. Keishiro Watanabe, Kazuhisa Yamagishi, Jun Okamoto, and Akira Takahashi, "Proposal of new QoE assessment approach for quality management of IPTV services," Proc. of IEEE ICIP, no. 1815, pp.2060-2063, Oct. 2008.
  8. Jun Okamoto, Keishiro Watanabe, Masato Uchida, Aoi Honda, and Seiichiro Hangai, "HDTV OBJECTIVE VIDEO QUALITY ASSESSMENT METHOD APPLIED FUZZY MEASURE," Proc. of QoMEX2009, pp. XXX-XXX, July 2009.
  9. Toshiko Tominaga, Takanori Hayashi, Jun Okamoto, and Akira Takahashi, "Performance Comparisons of Subjective Quality Assessment Methods for Mobile Video,"Proc of QoMEX2010, pp. XXX-XXX, June 2010.
  10. Aoi Honda and Jun Okamoto, "Inclusion-exclusion integral and its application to subjective video quality estimation," Proc. of IPMU 2010, June 2010.
  11. Taichi Kawano, Kazuhisa Yamagishi, Keishiro Watanabe, and Jun Okamoto, "No Reference Video-Quality-Assessment Model for Video Streaming Services," the 18th International Packet Video Workshop (PV2010), Dec. 2010.
  12. Mario Köppen, Jun Okamoto and Aoi Honda, "Fuzzy Fusion Fairness Relations for the Evaluation of User Preference," Proceedings of 2011 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2011), pp.2566-2574, Taipei, Taiwan, June 2011.
  13. Kazuhisa Yamagishi, Lina Karam, Jun Okamoto, and Takanori Hayashi, "Subjective Characteristics for Stereoscopic High Definition Video," Proc. of QoMEX2011, pp.37-42, Sept. 2011.
  14. K. Kawashima, J. Okamoto, K. Ishikawa, and K. Negishi, "Parameter comparison of assessing visual fatigue induced by stereoscopic," VAMR/HCII 2013, Part I, LNCS 8021, pp. 175-183, July 2013.
  15. K. Kawashima, J. Okamoto, T. Hayashi, “Verification on Stability and Reproducibility of DSCQS Method for Assessing 4K Ultra-HD Video Quality," Sixth International Workshop on Quality of Multimedia Experience (QoMEX 2014), pp.214-219, Sep. 2014
  16. Pierre Lebreton, Kimiko Kawashima, Kazuhisa Yamagishi, and Jun Okamoto, " Study on viewing time with regards to quality factors in adaptive bitrate video streaming," IEEE MMSP 2018, ID(18), Aug. 2018.
  17. S. Takahashi, K. Yamagishi, P. Lebreton, J. Okamoto, "Impact of Quality Factors on Users' Viewing Behaviors in Adaptive Bitrate Streaming Services," in Proc. International Conference on Quality of Multimedia Experience (QoMEX), June 2019.
  18. S. Takahashi, K. Yamagishi, J. Okamoto, "Classification of Viewing Abandonment Reasons for Adaptive Bitrate Streaming," in Proc. International Conference on Quality of Multimedia Experience (QoMEX), May 2020.
  19. Y. Urata, M. Koike, K. Yamagishi, N. Egi, and J. Okamoto, "Extension of ITU-T P.1203 model to tile-based omnidirectional video streaming," in Proc. of Electronic Imaging 2021, pp. 1611-1616, Jan. 2021.

[Contributions]

  1. A. Takahashi, J. Okamoto, "Performance evaluation of E-model and proposed modifications," ITU-T SG12 WP2, COM12-D146-E, Sep. 2003.
  2. J. Okamoto, A. Takahashi, "Comments on the scope of MM objective models," ITU VQEG meeting in Boulder, 26 Jan. 2004.
  3. J. Okamoto, T. Hayashi, A. Takahashi, T. Kurita, "Proposed ranges of packet-loss rate for various video codecs," ITU VQEG meeting in Roma, 14 June 2004.
  4. J. Okamoto, T. Hayashi, A. Takahashi, T. Kurita, "Results of preliminary tests at NTT and proposed subjective assessment method," ITU VQEG meeting in Seoul, 18 Oct. 2004.
  5. J. Okamoto, T. Hayashi, A. Takahashi, T. Kurita, "Proposed video capturing system for subjective assessment of VQEG," ITU VQEG meeting in Seoul, 18 Oct. 2004.
  6. J. Okamoto, T. Kurita, "Proposal of rule for choosing reference and distorted video sequences," ITU VQEG meeting in Phoenix, 25 April 2005.
  7. T. Kurita, J. Okamoto, "NTT_proposal of adjustment procedure," ITU VQEG meeting in Phoenix, 25 April 2005.
  8. J. Okamoto, T. Kurita, "Proposal to include additional reference sequence making method," ITU VQEG meeting at audio call, 26 May 2005.
  9. J. Okamoto, T. Kurita, "Proposal to increase limit of video expansion and contraction time," ITU VQEG meeting at audio call, 30 June 2005.
  10. J. Okamoto, T. Kurita, "HRCs that NTT can create," ITU VQEG meeting at audio call, 30 May 2005.
  11. J. Okamoto, T. Kurita, "Proposal of adding deinterlace filter," ITU VQEG meeting in Stockholm, 25 Sep. 2005.
  12. J. Okamoto, T. Kurita, "Proposal of screening low quality reference video sequences," ITU VQEG meeting in Boston, 24 April 2006.
  13. J. Okamoto, T. Kurita, "Proposal of using anchor video sequences to make processed video sequences," ITU VQEG meeting in Boston, 24 April 2006.
  14. J. Okamoto, K. Watanabe, T. Kurita,"Proposal to add the packet-loss condition in HDTV test plan," ITU VQEG meeting in Tokyo, 25 Sep. 2006.
  15. K. Watanabe, J. Okamoto, "Proposal of scope of hybrid - perceptual / bitstream project," ITU VQEG meeting in Paris, 7 May 2007.
  16. K. Watanabe, J. Okamoto, "Proposal of solution for problems of Hybrid - Perceptual Bitstream Project," ITU VQEG meeting in Ottawa, 10 Sep. 2007.
  17. K. Watanabe, J. Okamoto, "Performance of parametric bitstream model using ES layer information," ITU VQEG meeting in Ottawa, 20070910.
  18. K. Watanabe, K. Yamagishi, J. Okamoto, "Performance of bitstream layer model using ES layer information, " ITU-T SG12 Q14 Rapporteur's meeting in Shenzhen, March 2008.
  19. J. Okamoto, K. Watanabe, "Brief description of NTT's model on J.mmvofr "Objective perceptual multimedia video quality measurement in the presence of a full reference"," ITU-T SG9, WG5, COM9-C144-E, May 2008.
  20. J. Okamoto, K. Watanabe, "Performance indices and evaluation results for objective video quality models," ITU-T SG9, WG5, COM9-C145-E, May 2008.
  21. A. Takahashi, J. Okamoto, "Proposal on standardization of J.mmvofr "Objective perceptual multimedia video quality measurement in the presence of a full reference"," ITU-T SG9, WG5, COM9-C146-E, May 2008.
  22. J.247 Annex A , "Objective perceptual multimedia video quality measurement in the presence of a full reference," ITU-T Recommendation J.247, Aug. 2008.
  23. J. Okamoto, A. Takahashi, " OBJECTIVE PERCEPTUAL VIDEO QUALITY MEASUREMENT TECHNIQUES FOR BROADCASTING APPLICATIONS USING LOW DEFINITION TELEVISION IN THE PRESENCE OF A FULL REFERENCE," ITU-R Q44/WP6C, April 2009.
  24. J. Okamoto, K. Watanabe," Merger of Hybrid NR and Bitstream 2," ITU VQEG meeting in Berlin, June. 2009.
  25. T. Kawano, K. Yamagishi, and J. Okamoto, "Input information for hybrid perceptual model," ITU VQEG meeting in Berlin, June 2009.
  26. K. Watanabe, J. Okamoto, " Revision proposal of draft Terms of Reference (ToR) for P.NBAMS, " ITU-T SG12 Q14/WP2, Nov. 2009.
  27. T. Tominaga, T. Hayashi, J. Okamoto, and A. Takahashi, "Performance Comparisons of Subjective Quality Assessment Methods," ITU VQEG meeting in Boulder, Jan. 2010.
  28. T. Kawano, J. Okamoto, and A. Takahashi, "Expansion of scope of ITU-T Recommendation J.vqhdtv," ITU VQEG meeting in Boulder, Jan. 2010.
  29. T. Tominaga, H. Hayashi, J. Okamoto, and A. Takahashi, "Performance Evaluation of Subjective Assessment Methods on Video Quality," ITU-T Contribution SG12-1003-Q13-05, March 2010.
  30. T. Tominaga, H. Hayashi, J. Okamoto, and A. Takahashi, "Performance Evaluation of Subjective Assessment Methods on Video Quality," ITU-T Contribution, COM12- C102 , May 2010.
  31. J. Okamoto, "Proposal for 3D evaluation test plan in VQEG," ITU VQEG meeting in Korea, June. 2011.
  32. J. Okamoto, "Distribution of 3D standard contents," ITU VQEG meeting in Korea, June. 2011
  33. J. Okamoto, "Test Plan for Investigation of Subjective Assessment Methods with Stereoscopic Three-Dimensional Television," ITU VQEG meeting in Hillsboro, Dec. 2011.
  34. J. Okamoto, and T. Kawano, "Proposal for subjective test plan of stereoscopic three-dimensional video," ITU VQEG meeting in Korea, June 2012.

[Others]

  1. Kenji Sugiyama, Osamu Sugimoto, and Jun Okamoto, "High Quality Image Coding and Its Evaluation Technology," Journal of IEICE, Vol.91, No.4, pp. 267-274, April 2008.
  2. Jun Okamoto, Keishiro Watanabe, and Akira Takahashi, "Media-layer Objective Video Quality Assessment Technology for Video Communication Services (IUT-T J.247)," NTT Technical Review, Vol. 7 No. 4, Apr. 2009.
  3. Jun Okamoto, Takanori Hayashi, "Latest trends in Image Media Quality Assessment Technologies," IEICE Fundamentals Review, Vol.6, No.4, pp.276-284, April 2013.
  4. Tatsuya Yamazaki, Hiroyuki Oosaki, Takefumi Hiraguri, Tooru Hasegawa, Jun Okamoto, and Hideyuki Shimonishi, "Forefront of Communication Quality," Journal of IEICE, Vol.96, No.7, pp. 507-511, July 2012.
  5. K. Kawashima, J. Okamoto, "Assessment Methodologies for 4K Video Services," NTT Technical Review, vol.12, no.5, May 2014.
  6. Jun OKAMOTO, Ryogo KUBO, Sho TSUGAWA, Takefumi HIRAGURI, Takahiro MATSUDA, "Quality Assessment, Design, and Control of Communications Networks," Journal of IEICE, Vol.100, No.8, pp. 831-836, Aug. 2017.
  7. D. Ikegami, J. Okamoto, "Traffic Prediction and Quality Evaluation for Improving Communication Quality during Major Events," NTT Technical Review, Vol. 16 No. 6, June. 2018.
  8. N. Egi, D. Ikegami, T. Satake, N. Yosimura, S. Kikuchi, R. Tagyo, J. Okamoto, " QoE visualization and prediction model for QoE improvement," NTT Technical Review, Vol.16 No.10, Oct. 2018.
  9. J. Okamoto,” (Invited Speach) AI-based Intelligent Operation for Innovative Optical and Wireless Network (IOWN®),” The 24th Asia-Pacific Network Operations and Management Symposium(APNOMS2023), September 8, 2023.
  10. Jun Okamoto, Tomoko Shibata, Mitsuho Tahara, Masakatsu Fujiwara, and Masataka Masuda, " Operation to Achieve Robust Networks," NTT Technical Review, Vol. 21 No.12, pp.17–23, Dec. 2023.
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