Hemantha Kodikara Arachchi

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

Book chapters

  1. 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 processing and transmission, A. M. Kondoz (Ed.), John Wiley & Sons, In print.

Journal Publications

  1. 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, accepted, May/June 2009.
  2. 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 Journal, accepted, 2009.
  3. 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, accepted, Vol. E92-A, No. 3, April 2009.
  4. 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.
  5. 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
  6. 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
  7. 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.
  8. 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.
  9. 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. "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. 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," accepted to The International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS'09), London, UK, May 2009.
  2. G. Nur, H. Kodikara Arachchi, S. Dogan, and A. M. Kondoz, "Evaluation of quality scalability layer selection for content-aware scalable bit rate adaptation," accepted to The International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS'09), London, UK, May 2009.
  3. 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.
  4. 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.
  5. 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.
  6. 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)
  7. 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)
  8. 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.
  9. 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.
  10. 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
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. 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.
  20. 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.
  21. 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.
  22. 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.
  23. 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.
  24. 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.
  25. 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.
  26. 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.
  27. 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.
  28. 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.
  29. 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.
  30. 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.
  31. 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.
  32. 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.
  33. 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.
  34. 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.
  35. 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.
  36. 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.
  37. 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.
  38. 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.
  39. 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. Future Media and 3D Internet Task Force (FM3DI-TF), "Research on Future Media and 3D Internet, " October 2008.
  2. 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.
  3. 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.
  4. 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.
  5. 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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