Hemantha Kodikara Arachchi

BSc (Eng) (Moratuwa), MPhil (Moratuwa), DEng (AIT), MIEEE, MIET

Birds World, England
(c) H. Kodikara Arachchi, April 2007

Book chapters

  1. H. Kodikara Arachchi, "Future of 3DTV broadcasting: the MUSCADE perspective," 3D Future Internet Media, A. Kondoz and T. Dagiuklas, (Eds.), ISBN 978-1-4614-8372-4, Springer, pp ??-??, November, 2013.
  2. H. Kodikara Arachchi and S. Dogan, "Context Aware Content Adaptation for Personalised Social Media Access," Social Media Retrieval, R. van Zwol, J.-S. Lee, K. Cluver, and X.-S. Hua (Eds.), ISBN 978-1-4471-4554-7, Springer, London, pp 305-338, November 2012.
  3. H. Kodikara Arachchi, S. Nasir, S. Dogan, M. T. Andrade, V. Barbosa, A. Carreras, and J. Delgado, "Context-Based Visual Media Content Adaptation," Visual Media Coding and Transmission, A. M. Kondoz (Ed.), pp. 455-558, John Wiley & Sons Ltd., Chichester, United Kingdom, April, 2010.

Journal Publications

  1. V. De Silva, H. Kodikara Arachchi, E. Ekmekcioglu, and A.M. Kondoz, "Toward an Impairment Metric for Stereoscopic Video: A Full-Reference Video Quality Metric to Assess Compressed Stereoscopic Video", IEEE Transactions on Image Processing, , vol 22, no 9, pp 3392-3404, DOI 10.1109/TIP.2013.2268422, September 2013. (Full text)
  2. G. Nur, H. Kodikara Arachchi, S. Dogan, and A.M. Kondoz, "Seamless Video Access for Mobile Devices by Content-Aware Utility-Based Adaptation", Springer Journal Multimedia Tools and Applications (MTAP), Special Issue on Internet Multimedia Computing & Service, DOI 10.1007/s11042-012-1120-2, May 2012 (online publication date).
  3. G. Nur, H. Kodikara Arachchi, S. Dogan, and A.M. Kondoz, "Advanced Adaptation Techniques for Improved Video Perception," IEEE Transactions on Circuits and Systems for Video Technology, vol. 22, no. 2, pp. 225-240, February 2012.
  4. D. V. S. X. De Silva, W. A. C. Fernando, H. Kodikara Arachchi, S.T. Worrall, A.M. Kondoz, "A Depth Map Post-Processing Technique for 3D-TV Systems based on Compression Artifact Analysis," IEEE Journal of Selected Topics in Signal Processing, vol. 5, no. 8, DOI 10.1109/JSTSP.2011.2165274, November 2011.
  5. D. V. S. X. De Silva, W. A. C. Fernando, S.T.Worrall, H. Kodikara Arachchi and A.M. Kondoz, "Sensitivity Analysis of the Human Visual System for Depth Cues in Stereoscopic 3D Displays," IEEE Transactions on Multimedia, vol. 13, no. 3, June 2011.
  6. G. Nur, H. Kodikara Arachchi, S. Dogan, and A. M. Kondoz, "Modeling user perception of 3D video based on ambient illumination context for enhanced user centric media acceess and consumption," Multimedia Tools and Applications, DOI 10.1007/s11042-011-0824-z, June 2011, (online publication date)
  7. M. T. Andrade, S. Dogan, A. Carreras, V. Barbosa, H. Kodikara Arachchi, J. Delgado and A. M. Kondoz, "Advanced delivery of sensitive multimedia content for better serving user expectations in Virtual Collaboration applications," Multimedia Tools and Applications, vol. 51, no. 3, pp. 633-661, February 2011 (Full text)
  8. A. Carreras, E. Rodriguez, S. Dogan, H. Kodikara Arachchi, X. Perramon, J. Delgado, and A.M. Kondoz, "Architectures and Technologies for Adaptation of Secured Content in Governed Multimedia Applications," IEEE Multimedia, February 2011.
  9. D. V. S. X. De Silva, W. Fernando, H. Kodikara Arachchi, S. Worrall, and A. Kondoz, "Adaptive sharpening of depth maps for 3D-TV," Electronics Letters, vol. 46, pp. 1546 -1548, 2010.
  10. G. Nur, H. Kodikara Arachchi, S. Dogan, and A. M. Kondoz, "Ambient illumination as context for video bit rate adaptation decision taking," IEEE Transactions on Circuits and Systems for Video Technology, vol. 20, no. 12, pp. 1887-1891, December 2010. (Abstract/Full text)
  11. A. Carreras, V. Barbosa, H. Kodikara Arachchi, J. Delgado, S. Dogan, M. T. Andrade, E. Rodríguez, and A. M. Kondoz, "Context-Aware and DRM-Enabled Content Adaptation Platform for Collaboration Applications," IEEE Multimedia, vol. 17, no. 2, pp. 74-89, April-June 2010. (Abstract/Full text)
  12. H. Kodikara Arachchi, X. Perramon, S. Dogan, and A. M. Kondoz, "Adaptation-aware encryption of scalable H.264/AVC video for content security," Elsevier Journal Signal Processing: Image Communication, Special Issue on Scalable coded media beyond compression, Vol. 24, No. 6, pp. 468-483, June 2009.
  13. M. B. Badem, W. A. C. Fernando, W. A. R. J. Weerakkody, H. Kodikara Arachchi, and A. M. Kondoz, "Transform Domain Unidirectional Distributed VideoCoding Using Dynamic Parity Allocation," IEICE Transactions on Fundamentals, Vol. E92-A, No. 3, April 2009.
  14. H. Kodikara Arachchi, W.A.C. Fernando, E.A. Edirisinghe, "Novel Scanning Order for Improving the Bit Rate Performance of ZTE Video Coding," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E89-A, No. 11, pp. 2977-2984, 2006.
  15. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, "Context based Motion and Disparity Vector Prediction Algorithm for H.264 Based Stereoscopic Video Coding," ELEX Electronics Letters, Vol. 4, No 9, Jun. 2006
  16. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, W.A.R.J. Weerakkody, "Sequential Motion Estimation Using Luminance and Chrominance Information for Distributed video coding of Wyner-Ziv frames," IEE Electronic Letters, Vol. 42, No. 7, pp. 379-433, Mar. 2006
  17. S. Sharma, W.A.C. Fernando, H. Kodikara Arachchi, "Adaptive Joint Source Channel Coding for Low Bit-Rate Conversational Video Communications with H.264 Video Codec," SPIE Optical Engineering Journal, Vol. 45, No. 9, Sep. 2006.
  18. H. Kodikara Arachchi, W.A.C. Fernando, "H.264/AVC in Mobile Environment: A Review," SPIE Optical Engineering Journal, Vol. 44, No. 9, Sep. 2005.
  19. H. Kodikara Arachchi, W.A.C. Fernando, "An Intelligent Rate Control Algorithm to Improve the Video Quality at Scene Transitions for off-line MPEG-1/2 Encoders", IEEE Trans. on Consumer Electronics, Feb. 2003.

Contributions to standardisation activities

  1. E. Ekmekcioglu, S.T. Worrall, H. Kodikara Arachchi, S. Dogan, B. Gunel, and A.M. Kondoz, "New Multi-view Test Sequences and Camera Parameters for 3DV Standardisation Work," Report, ISO/IEC JTC 1/SC 29/WG 11, MPEG2010/M20068, Geneva, Switzerland, March 2011.
  2. "Contribution to the Advanced Surveillance AF," Input Contribution to MPEG09, ISO/IEC JTC 1/SC 29/WG 11, m16159 and m16161, Lausanne, CH, February 2009.

Conference Publications

  1. C. De Alwis, V. De Silva, H. Kodikara Arachchi, A. Fernando, A. Kondoz, "On the multicast of delay sensitive data in erasure networks using proactical network coding", IEEE International Conference on Consumer Electronics (ICCE 2014), Las Vegas, USA, 10-13 Juanuary 2014. (accepted)
  2. C. De Alwis, V. De Silva, H. Kodikara Arachchi, A. Fernando, A. Kondoz, "Network Coding For Error Resilient Transmission of Stereoscopic 3D Video", International Conference on Communications (ICC 2013), Budapest, Hungary, 9-13 June 2013.
  3. C. De Alwis, H. Kodikara Arachchi, A. Fernando, A. Kondoz, "Towards minimising the coefficient vector overhead in random linear network coding", 38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013), Vancouver, Canada, 26-31 May 2013.
  4. C. De Alwis, H. Kodikara Arachchi, V. De Silva, A. Fernando, A. Kondoz, "Robust Video Communication using Random Linear Network Coding with Pre-Coding and Interleaving", Proceedings of the International Conference on Image Processing (ICIP 2012), Florida, USA, 30 Sep.-03 Oct. 2012.
  5. D.V.S.X. De Silva, H. Kodikara Arachchi, E. Ekmekcioglu, A. Fernando, S. Dogan, A. Kondoz, and S. Savas, "Psycho-physical Limits of Interocular Blur Suppression and its Application to Asymmetric Stereoscopic Video Delivery", Proceedings of the 19th IEEE International Packet Video Workshop (PV 2012), Munich, Germany, 10-11 May 2012.
  6. E. Ekmekcioglu, H. Kodikara Arachchi, A. Kondoz, G. Gurler, and S. Savas, "Content Aware Delivery of Visual Attention based Scalable Multi-View Video over P2P", Proceedings of the 19th IEEE International Packet Video Workshop (PV 2012), Munich, Germany, 10-11 May 2012.
  7. G. Nur, D.V.S.X. De Silva, H. Kodikara Arachchi, A. Kondoz, W. Fernando, M.O. Martinez-Rach, and S. Dogan, "Sensitivity of the HVS for Binocular Disparity Cue in 3D Displays under Different Ambient Illumination Conditions," Proceedings of the 30th IEEE International Conference on Consumer Electronics (ICCE 2012), Las Vegas, NV, USA, 13-16 January 2012.
  8. M.O. Martínez-Rach, D.V.S.X. De Silva, W.A.C. Fernando, H. Kodikara Arachchi, O.L. Granado, M. Malumbres, "A low complexity wavelet based depth map encoder for low bit rate 3D video applications," Proceedings of the 30th IEEE International Conference on Consumer Electronics (ICCE 2012), Las Vegas, NV, USA, 13-16 January 2012.
  9. G. Nur, S. Dogan, H. Kodikara Arachchi, and A.M. Kondoz, "Extended VQM model for predicting 3D video quality considering ambient illumination context," Proceedings of the 3DTV-CON'11: The true vision, capture, transmission and display of 3D video, Antalya, Turkey, 16-18 May, 2011.
  10. D.V.S.X. De Silva, W.A.C. Fernando, H. Kodikara Arachchi, S.T. Worrall and A.M. Kondoz, "Improved depth map filtering for 3D-TV systems," Proceedings of the IEEE International Conference on Consumer Electronics (ICCE 2011), Las Vegas, NV, USA, 9-12 January 2011. (Full paper)
  11. G. Nur, S. Dogan, H. Kodikara Arachchi, and A.M. Kondoz, "Assessing the Effects of Ambient Illumination Change in Usage Environment on 3D Video Perception for User Centric Media Access and Consumption", Proceedings of the 2nd ICST International Conference on User Centric Media (UCMedia 2010), Palma de Mallorca, Spain, 1-3 September 2010. (Best paper award winner)
  12. G. Nur, S. Dogan, H. Kodikara Arachchi, and A.M. Kondoz, "Impact of Depth Map Spatial Resolution on 3D Video Quality and Depth Perception", Proceedings of the 4th IEEE 3DTV Conference (3DTV-CON 2010), Tampere, Finland, 7-9 June 2010.
  13. F. Lopez, G. Nur, S. Dogan, H. Kodikara Arachchi, M. Mrak, J.M. Martinez, N. Garcia, and A. Kondoz, "Improving Scalable Video Adaptation in a Knowledge-Based Framework", Proceedings of the 11th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2010), Desenzano Del Garda, Italy, 12-14 April 2010.
  14. G. Nur, H. Kodikara Arachchi, S. Dogan, and A.M. Kondoz, "A Novel Scalability Adaptation Concept for Higher R-D Performances of Scalable Video", Proceedings of the ICT Mobile and Wireless Communications Summit (ICT-MobileSummit 2009), Santander, Spain, 10-12 June 2009.
  15. A. Carreras, M. T. Andrade, T. Masterton, H. Kodikara Arachchi, V. Barbosa, S. Dogan, J. Delgado, A. M. Kondoz, "Contextual information in virtual collaboration systems beyond current standards," Proceedings of the International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS'09), London, UK, May 2009.
  16. G. Nur, H. Kodikara Arachchi, S. Dogan, and A. M. Kondoz, "Evaluation of quality scalability layer selection for content-aware scalable bit rate adaptation," Proceedings of the International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS'09), London, UK, May 2009.
  17. A. Carreras, R. Tous, E. Rodríguez, J. Delgado, G. Cordara, G. Francini, S. Lepsoy, S. Dogan, and H. Kodikara Arachchi, "Enriching search and retrieval of multimedia information with DRM services and context-based content adaptation" , in Proceedings of 2nd International Workshop on Multimedia Data Mining and Management (MDMM 2008), Turin, Italy , September 2008.
  18. H. Kodikara Arachchi, C. T. E. R. Hewage, S. Dogan, M. Mrak, V. Barbosa, M. T. Andrade, and A. M. Kondoz, “Scalability adaptation for optimisation of SVC-based video coding efficiency”, in Proceedings of 50th IEEE Int. Symposium ELMAR-2008, Zadar, Croatia, 10-13 Sep. 2008.
  19. V. Barbosa, A. Carreras, H. Kodikara Arachchi, S. Dogan, M. T. Andrade, J. Delgado, A. M. Kondoz, “A scalable platform for context-aware and DRM-enabled adaptation of multimedia content”, in Proceedings of ICT Mobile and Wireless Communications Summit (ICT-MobileSummit 2008), Stockholm, Sweden, 10-12 Jun. 2008.
  20. H. Kodikara Arachchi, S. Dogan, H. Uzuner and A.M. Kondoz, "Utilising Macroblock SKIP Mode Information to Accelerate Cropping of an H.264/AVC Encoded Video Sequence for User Centric Content Adaptation", in Proceedings of the 3rd International Conference on Automated Production of Cross Media Content for Multi-Channel Distribution (AXMEDIS'2007), Barcelona, Spain, 28-30 November 2007. (Abstract/Full Text)
  21. M.T. Andrade, H. Kodikara Arachchi, S. Nasir, S. Dogan, H. Uzuner, A.M. Kondoz, J. Delgado, E. Rodriguez, A. Carreras, T. Masterton and R. Craddock, "Using Context to Assist the Adaptation of Protected Multimedia Content in Virtual Collaboration Applications", in Proceedings of the 3rd IEEE International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom'2007), New York, NY, USA, 12-15 November 2007. (Full Paper)
  22. M.B. Badem, S.T. Worrall, H. Kodikara Arachchi, A. Kondoz, "Transform Domain Residual Coding Technique for Distributed Video Coding," in Proceedings of Picture Coding Symposium (PCS’2007), Lisbon, Portugal, November 2007.
  23. C.T.E.R. Hewage, S. Worrall, S. Dogan, H. Kodikara Arachchi, A.M. Kondoz "Stereoscopic TV over IP," in 4th European Conference on Visual Media Production (CVMP2007), London, UK, November 2007.
  24. C. T. E. R. Hewage, H. Kodikara Arachchi, T. Masterton, A. C. Yu, H. Uzuner, S. Dogan, and A. M. Kondoz, "Content adaptation for Virtual Office Environment using Scalable Video Coding", in Proceedings of the 16th IST Mobile and Wireless Communications Summit (IST Summit’2007), Budapest, Hungary, 1-5 July 2007
  25. H. Kodikara Arachchi, W.A.C. Fernando, “Unequal Error Protection Aware Rate Control Technique for Partitioned H.264 Coded Video Transmission,” in Proceedings of Wireless Personal Multimedia Communications (WPMC-06), San Diego, USA, Sep. 2006.
  26. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, W.A.R. Weerakkody, “Wyner-Ziv Intra Coding,” in Proceedings of Wireless Personal Multimedia Communications (WPMC-06), San Diego, USA, Sep. 2006.
  27. S. Adedoyin, W.A.C. Fernando, H. Kodikara Arachchi, A. Aggoun, , “An Efficient Motion Estimation Technique for 3D Integral Video Compression,” in Proceedings of Wireless Personal Multimedia Communications (WPMC-06), San Diego, USA, Sep. 2006.
  28. A. Shahriari, W.A.C. Fernando, H. Kodikara Arachchi, "Real-Time Concealment of Whole-Frame Losses with Generalized Regression Neural Networks for Conversational Video Communications Over Lossy Channels” in Proceedings of Wireless Personal Multimedia Communications (WPMC-06), San Diego, USA, pp.634-637, Sep. 2006.
  29. P. Sivanantharasa, W.A.C. Fernando, H. Kodikara Arachchi, “Region of Interest Video Coding with Flexible Macroblock Ordering,” in Proceedings of IEEE International Conference on Industrial and Information Systems, Sri Lanka, Aug. 2006.
  30. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, W.A.R.J. Weerakkody “Low Complex Key Frame Encoding With High Quality Wyner-Ziv Coding,” in Proceedings of IEEE International Conference on Industrial and Information Systems, Sri Lanka, Aug. 2006.
  31. A. Shahriari, W.A.C. Fernando, H. Kodikara Arachchi, W.A.R.J. Weerakkody “Adaptive Error Concealment With Radial Basis Neuro-Fuzzy Networks For Video Communication over Lossy Channels,” in Proceedings of IEEE International Conference on Industrial and Information Systems, Sri Lanka, Aug. 2006.
  32. H. Kodikara Arachchi, W.A.C. Fernando, S. Panchadcharam, “Unequal Error Protection Technique for ROI Based H.264 Video Coding,” in Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, Ottawa, Canada, May 2006.
  33. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, W.A.R. Weerakkody, “Wyner-Ziv Coding with Temporal and Spatial Correlations for Motion Video,” in Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, Ottawa, Canada, May 2006.
  34. S. Mayuran, W.A.C. Fernando, T. Kalganova, H. Kodikara Arachchi, ” Evolutionary Strategy Based Improved Motion Estimation Technique for H.264 Video Coding,” in Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, Ottawa, Canada, May 2006.
  35. A. Shahriari, W.A.C. Fernando, H. Kodikara Arachchi, “Adaptive Video Concealment Using Neural Networks for H.264 Based Video Coding,” in Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, Ottawa, Canada, May 2006.
  36. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, “A New Motion and Disparity Vector Prediction Technique for H.264 Based Stereoscopic Video Coding,” in Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS 2006), Island of Kos, Greece, May 2006.
  37. H. Kodikara Arachchi, W.A.C. Fernando, "A Modified Block Matching Algorithm for Error Concealment in Conversational Video Communications", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, September 2005.
  38. H. Kodikara Arachchi, E.A. Edirisinghe, W.A.C. Fernando, "Novel Scanning Order for Improving the Bit Rate Performance of ZTE Video Coding", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, September 2005.
  39. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi, K.K. Loo, "A H.264 Compliant Stereoscopic Video Codec", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, September 2005.
  40. S. Adedoyin, W.A.C. Fernando, H. Kodikara Arachchi, T. Kalganova, "An Efficient Motion Estimation Algorithm for H.264 Based Conversational Video Codecs", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, September 2005.
  41. L. Zhang, W.A.C. Fernando, H. Kodikara Arachchi, K.K. Loo, "Performance Evaluation of H.264 Codec in the W-CDMA Wireless Environments", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, September 2005.
  42. P.Y. Yip, W.A.C. Fernando, J.A. Malcolm, K.K. Loo, H. Kodikara Arachchi, "Constant Bit Rate H.264/AVC Compliant Stereoscopic Video Transmission Over W-CDMA Channels", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, vol. 7, pp. 1340-1349, September 2005.
  43. P.Y. Yip, W.A.C. Fernando, K.K. Loo, H. Kodikara Arachchi, "Prioritised Modulation Scheme for H.264/AVC Compliant Stereoscopic Video Transmission Over Rayleigh Fading Channel", in Proceedings of Wireless Personal Multimedia Communications (WPMC'05), Aalborg, Denmark, vol. 7, pp. 1360-1364, September 2005.
  44. H. Kodikara Arachchi, W.A.C. Fernando, "PSO Based Bit Rate Optimization for MPEG-1/2 Video Coding", in Proceedings of International Conference on Image Processing (ICIP'05), Genova, Italy, September 2005.
  45. S. Adedoyin, W.A.C. Fernando, H. Kodikara Arachchi, T. Kalganova and K.K. Loo, "An Evolutionary Strategy Based Motion Estimation Algorithm for H.264 Video Codec," in Proceedings of Canadian Conference on Electrical and Computer Engineering, Saskatoon, Saskatchewan, Canada, May 2005.
  46. A.B.B. Adikari, W.A.C. Fernando, H. Kodikara Arachchi and K.K. Loo, "H.264 Compliant Stereoscopic Video Codec for Low Bit Rate Applications," in Proceedings of Canadian Conference on Electrical and Computer Engineering, Saskatoon, Saskatchewan, Canada, May 2005.
  47. P.Y. Yip, J.A. Malcolm, W.A.C. Fernando, K.K. Loo and H. Kodikara Arachchi, "Joint Source and Channel Coding for H.264 Compliant Stereoscopic Video Transmission," in Proceedings of Canadian Conference on Electrical and Computer Engineering, Saskatoon, Saskatchewan, Canada, May 2005.
  48. H. Kodikara Arachchi, W.A.C. Fernando "GA Based Bit Rate Optimization for MPEG-1/2 Video Coding", in Proceedings of Wireless Personal Multimedia Communications (WPMC2004), Abano Terme, Italy, 12-15 September 2004.
  49. H. Kodikara Arachchi, W.A.C. Fernando, "Improving the Mpeg-1/2 Video Quality at Scene Transitions", in Proceedings of IEEE International Symposium on Circuits and Systems, May 2003.
  50. H. Kodikara Arachchi, W.A.C. Fernando, "Bit Rate Control Schemes in MPEG Video Compression", in Proceedings of IEEE ISCIT-2002 conference, Pattaya, Thailand, October 2002.
  51. H. Kodikara Arachchi and W.A.C. Fernando, "Effect of Dissolve Transitions in Rate Control of MPEG-1/2 Video", in Proceedings of 56th IEEE Vehicular Technology Conference, Vancouver, Canada, September 2002.
  52. H. Kodikara Arachchi and W.A.C. Fernando, "Intelligent Video Coding for MPEG-1/2, Video", in Proceedings of IEEE ITC-CSCC-2002 Conference, Phuket, Thailand, July 2002.
  53. H. Kodikara Arachchi, J.A.K.S. Jayasinghe, "Adaptive Traffic Signal Controller for Coordinated Traffic Control Systems in a Multi-processor Architecture", in Proceedings of the Fifth Annual Symposium of the Engineering Research Unit, University of Moratuwa, 1999.

Technical Reports

  1. H. Kodikara Arachchi, B. Günel, L. Yasakethu, W.A.C. Fernando, L. A. Maltoni, K. P. Tamas, and A Laborie, "QoE methodology and tools," Technocal Report, MUSCADE T4.1 deliverable, MUS.RP.00007.UNIS, June 2010.
  2. H. Kodikara Arachchi, B. Günel, L. Yasakethu, C. Ozsinar, W.A.C. Fernando, E. Robeis and K. P. Tamas, "QoE algorithms and tools," Technocal Report, MUSCADE T4.1 deliverable, MUS.RP.00011.UNIS, December 2010.
  3. Future Media and 3D Internet Task Force (FM3DI-TF), "Research on Future Media and 3D Internet, " October 2008.
  4. H. Kodikara Arachchi, B. Günel, D. Rodriguez, S. Dogan and H. Uzuner "High definition video and B-format audio data set," White paper VISNET/WP21, July 2008.
  5. Hemantha Kodikara Arachchi, Sabih Nasir, Marta Mrak, Kan Ren, Gokce Nur, Janko Calic, Safak Dogan, Anna Carreras, Jaime Delgado, Vitor Barbosa, and Maria Teresa Andrade "Second set of contributions on context-based adaptation," Networked Audiovisual Media Technologies (VISNET II), IST–1-038398, Technical Report VISNET/WP21/D213, April 2008.
  6. VISNET II/WP2.3 Partners, "Report on Common Evaluation Methodologies and Results," Networked Audiovisual Media Technologies (VISNET II), IST–1-038398, Technical Report VISNET/WP23/D232, Dec. 2007.
  7. Maria Teresa Andrade, Jaime Delgado, Anna Carreras, S. Nasir, H. Kodikara Arachchi, S. Dogan, H. Uzuner, G. Nur, "First developments on context-based adaptation," Networked Audiovisual Media Technologies (VISNET II), IST–1-038398, Technical Report VISNET/WP21/D211, May 2007.

Selected Abstracts

Title - Adaptation-aware encryption of scalable H.264/AVC video for content security

Abstract - Data encryption is one of the key information security technologies used for safeguarding multimedia content from unauthorised access and manipulation in end-to-end delivery and access chains. This technology, combined with the appropriate cryptographic methods, effectively prevents the content against malicious attacks, so as to protect its authenticity as well as integrity. While encryption based security is ensuring the authorised consumption of the multimedia content, content adaptation technologies have the primary goal of providing means for wider dissemination of the content across diverse networks, devices and users, and thus enriching user satisfaction and experience of the delivered content within a given set of usage environment constraints. Traditionally, protected contents can only be adapted at trusted adaptation engines residing between the source and end-users since they have to be fully decrypted before performing the necessary adaptation operations. The drawback of such a process is that it significantly limits the availability and flexibility of adaptation engines applicable for adapting protected contents on the fly. Thus, this paper proposes a novel scalable H.264/Advance Video Coding (AVC)-compatible video encryption technique, which is also transparent to adaptation engines in an end-to-end video delivery scenario. The proposed technology relies on keeping syntax elements required for performing the adaptation operations clear (i.e., not encrypted). The effectiveness of the proposed technique has been successfully verified in scenarios, where both conventional Joint Scalable Video Model (JSVM) bit stream extracting and random packet dropping mechanisms are used.


Title - Utilising Macroblock SKIP Mode Information to Accelerate Cropping of an H.264/AVC Encoded Video Sequence for User Centric Content Adaptation

Abstract - This paper proposes a framework for a virtual classroom application based on a Virtual Collaboration System (VCS), which is being developed under the VISNET II Network of Excellence (NoE)1, and discusses adaptation technologies that enable seamless access to classroom sessions while intellectual property and digital rights are managed. The proposed virtual classroom framework enables academic institutions to conduct their collaborative lecture series, to which registered students will be able to attend remotely and interactively over the Internet. Furthermore, the general public may also follow the classroom sessions under certain restrictions imposed by the participating institutions. In order to facilitate seamless access to a heterogeneous audience that is composed of users with various preferences and privileges accessing the classroom sessions over different network infrastructures and using terminal devices with diverse capabilities, context-aware content adaptation is required to meet constraints imposed by the usage context and enhance the quality of the user experience. Thus, this paper describes the concepts and functionalities of a context-aware content adaptation platform that suits the requirements of such multimedia application scenarios. This platform is able to consume low-level contextual information to infer higher-level contexts, and thus decide the need for and type of adaptation operations to be performed upon the content. In this way, it is aimed to meet usage constraints while also satisfying restrictions imposed by the Digital Rights Management (DRM) to govern the use of protected content. (Full Paper)


Title - Context based motion and disparity vector prediction algorithm for H.264 based stereoscopic video coding

Abstract - H.264 video coding standard supports 3D video through dedicated Stereo Video Information (SVI) Supplemental Enhancement Information (SEI) message. This SEI message allows main and auxiliary frames be coded into alternative pictures in which disparity information can also be utilized. However, due to the presence of both disparity and motion vectors at the neighborhood of a given macroblock, the H.264 predicted motion vector motion vector concept becomes less efficient. This paper presents a novel motion and disparity vector prediction algorithm that overcomes this drawback. Results show that the proposed algorithm achieves up to 1dB gain compared to the conventional motion vector prediction algorithm. (Abstract/Full Text)


Title - An Intelligent Rate Control Algorithm to Improve the Video Quality at Scene Transitions for off-line MPEG-1/2 Encoders

Abstract - MPEG-I/2 are the most popular compression schemes used in consumer video products. The significant problem in these compression schemes is high fluctuation in output data rate over the video sequence. These encoders, in general, utilize a rate control algorithm in order to maintain the output data rate at a constant level regardless of the properties of the video sequence and differences in compression ratios of different picture types. Conventional rate control algorithms such as TM5 cannot maintain the picture quality at scene transitions where statistical properties of pictures changes significantly. This paper presents an innovative algorithm to improve the video quality at sudden and gradual scene transitions. The algorithm works in three steps. The fixed encoding structure of the MPEG data stream is disturbed by forcing an extension or termination of the last GOP of the first scene such that the first anchor picture of the second scene becomes an I-coded picture. The complexity parameters of each picture types are, then, corrected with an iterative algorithm. P-pictures are provided with additional bits to cope with inefficient forward prediction during gradual scene transitions. Experimental results show that with the proposed algorithm, both objective and subjective quality of MPEG video can be improved significanty during scene transitions. (Full Text)

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