Chair of Multimedia Telecommunications and Microelectronics


Tomasz Grajek

Tomasz Grajek

(born 1980) received his M.Sc. and Ph.D. degrees from Poznan University of Technology in 2004 and 2010 respectively. At present he is an research assistant at Chair of Multimedia Telecommunications and Microelectronics.

Senior Member of Institute of Electrical and Electronics Engineers (IEEE) and member of Polish Society for Theoretical and Applied Electrical Engineering (PTETiS).

He is an author and co-author of about 80 papers on digital video compression, modeling of advanced video encoders, digital video watermarking and stereoscopic video surveillance systems. He holds 10 patents (EPO and USPTO). He has been taking part in several projects for industrial research and development:

  • A simple system for free-viewpoint television (FTV)
  • Video transcoders development (AVC to HEVC, HEVC to HEVC)
  • HEVC (MPEG-H part 2 / H.265) video codec software implementation and development
  • AVC (MPEG-4 part 10 / H.264) video codec software implementation and development
  • MPEG-2 to AVC (MPEG-4 part 10 / H.264) video transcoder development
  • Automatic image quality improvements
  • Scalable video encoder and decoder improvements
  • Compressed video bitstream watermarking
  • Automatic system for vehicle data extraction using stereoscopic video analysis
  • 3D-ConTourNet COST Action IC1105 (Member Country delegate)
  • Video coding for machines (VCM)

He received several awards and grants (selected):

  • Poznan University of Technology, Rector's Scientific and Didactic Awards, 2021
  • Poznan University of Technology, Rector's Scientific Award, 2020
  • Poznan University of Technology, Rector's Scientific Award, 2019
  • Poznan University of Technology, Rector's Scientific and Organization Awards, 2018
  • Poznan University of Technology, Rector's Scientific Award, 2017
  • Short Term Scientific Mission, “Compression of Light Field images with help of 3D-HEVC”, Politechnic Institute of Leiria, Portugal, September 2015
  • Trainee Grant Award, COST Action IC1105, ISCTE – Instituto Universitário de Lisboa, Lisbon, Portugal, July 2015
  • Poznan University of Technology, Rector's Scientific Award, 2014
  • Trainee Grant Award, COST Action IC1105, University of Technology and Economics, Budapest, Hungary,July 2014
  • GOLD MEDAL in the contest INNOVATION 2013 during 9th Industrial Technology, Science and Innovation Fair "TECHNICON-INNOVATION 2013" for “Stereoscopic system for estimation of vehicle size” (group award), Gdańsk, 2013
  • Poznan University of Technology, Rector's Organization Award, 2013
  • Kalman Fazekas Special Award for the best paper presented on International Conference on Systems, Signals and Image Processing, IWSSIP, Bucharest, 2013
  • Poznan University of Technology, Rector's Scientific Award, 2012
  • The best Ph.D. thesis in the domain of image processing from Association for Image Processing, 2012
  • Poznan University of Technology, Rector's Scientific Award, 2011

General Chair of 24th International Conference on Systems, Signals and Image Processing (IWSSIP) 2017

Organizing Committee member of renowned international conferences in signal processing and image coding thematic areas:

  • Picture Coding Symposium (PCS) 2012 – worldwide leading conference in image and video compression
  • European Signal Processing Conference (EUSIPCO) 2007 - major European conference in signal processing, over 500 participants from whole world
  • International Conference on Signals and Electronic Systems (ICSES) 2004
  • International Conference on Systems, Signals and Image Processing (IWSSIP) 2004
  • Organizing Committee member of 73rd MPEG meeting + 16th JVT meeting (2005) - leading body in research and standardization for multimedia, over 300 participants

His current researches encompass implementing and optimizing video encoders and decoders, modeling of advanced video coders, stereoscopic video surveillance system and video transcoding and watermarking.

He is interested in network issues, basketball, film and tourism.

Contact

Room: 137 (Polanka)
Phone: +48 61 665 3841
Mail: tgrajek@multimedia.edu.pl
MaiI: tomasz.grajek@put.poznan.pl

Duty hours

Wed 08:45 - 09:30, Thu 09:45 - 10:30

Awards

Research projects

Publications

Book chapters

  1. Dragan Kukolj, Libor Bolecek, Ladislav Polak, Tomas Kratochvil, Ondrej Zach, Jan Kufa, Martin Slanina, Tomasz Grajek, Jarosław Samelak, Marek Domański, Dragorad A. Milovanovic,
    Chapter: 3D Content Acquisition and Coding,
    Book: 3D Visual Content Creation, Coding and Delivery, Editors: Pedro Amado Assunção, Atanas Gotchev,
    Signals and Communication Technology: Springer International, 2019, pp. 41-95, ISBN: 978-3-319-77841-9, ISSN: 1860-4862,
    EndNoteCitationDOI
  2. Marek Domański, Tomasz Grajek, Caroline Conti, Carl James Debono, Sérgio M. M. de Faria, Peter Kovacs, Luís F. R. Lucas, Paulo Nunes, Cristian Perra, Nuno M. M. Rodrigues, Mårten Sjöström, Luís Ducla Soares, Olgierd Stankiewicz,
    Chapter: Emerging Imaging Technologies: Trends and Challenges,
    Book: 3D Visual Content Creation, Coding and Delivery, Editors: Pedro Amado Assunção, Atanas Gotchev,
    Signals and Communication Technology: Springer International, 2019, pp. 5-39, ISBN: 978-3-319-77841-9, ISSN: 1860-4862,
    EndNoteCitationDOI
  3. Damian Karwowski, Tomasz Grajek, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Chapter: 20 Years of Progress in Video Compression - from MPEG-1 to MPEG-H HEVC. General View on the Path of Video Coding Development,
    Book: Image Processing and Communications Challenges 8, Editors: Ryszard S. Choras,
    Advances in Intelligent Systems and Computing: No. 525, Springer International, 2016, pp. 3-15, ISBN: 978-3-319-47273-7, ISSN: 2194-5375,
    Full textEndNoteCitationDOI
  4. Tomasz Grajek, Damian Karwowski, Jakub Stankowski,
    Chapter: Algorithmically optimized AVC video encoder with parallel processing of data,
    Book: Image Processing and Communications Challenges 7, Editors: Ryszard S. Choras,
    Advances in Intelligent Systems and Computing: No. 389, Springer International, 2015, pp. 97-104, ISBN: 978-3-319-23813-5, ISSN: 2194-5375,
    Full textEndNoteCitationDOI

International journals

  1. Olgierd Stankiewicz, Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Tomasz Grajek,
    HEVC encoding assisted with noise reduction,
    International Journal of Electronics and Telecommunications, Vol. 64, No. 3, Electronics and Telecommunications Committee of Polish Academy of Sciences, Warsaw, 2018, pp. 285-292, ISSN: 0867-6747,
    Full textEndNoteCitationDOI
  2. Jakub Stankowski, Damian Karwowski, Tomasz Grajek, Krzysztof Wegner, Jakub Siast, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Analysis of Compressed Data Stream Content in HEVC Video Encoder,
    International Journal of Electronics and Telecommunications, Vol. 61, No. 2, Electronics and Telecommunications Committee of Polish Academy of Sciences, Warsaw, 2015, pp. 121-127, ISSN: 0867-6747,
    Full textEndNoteCitationDOI
  3. Filip Lewandowski, Mateusz Paluszkiewicz, Tomasz Grajek, Krzysztof Wegner,
    Methodology for 3D video subjective quality evaluation,
    International Journal of Electronics and Telecommunications, Vol. 59, No. 1, 2013, pp. 25-32,
    Full textEndNoteCitation
  4. Marek Domański, Olgierd Stankiewicz, Krzysztof Wegner, Maciej Kurc, Jacek Konieczny, Jakub Siast, Jakub Stankowski, Robert Ratajczak, Tomasz Grajek,
    High Efficiency 3D Video Coding Using New Tools Based on View Synthesis,
    IEEE Transactions on Image Processing, Special Issue on 3D Video Representation, Compression, & Rendering, Vol. 22, No. 9, September 2013, pp. 3517-3527,
    Full textEndNoteCitationDOI

International conferences

  1. Marek Domański, Yasir Al-Obaidi, Tomasz Grajek,
    Universal modeling of monoscopic and multiview video codecs with applications to encoder control,
    IEEE International Conference on Image Processing ICIP2021, Anchorage-Alaska, USA, 19-22 September 2021,
    Full textEndNoteCitationDOI
  2. Yasir Al-Obaidi, Tomasz Grajek,
    Estimation of the Optimum Depth Quantization Parameter for a Given Bitrate of Multiview Video plus Depth in 3D-HEVC Coding,
    28th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2020, Pilsen, Czech Republic, 19-21 June 2020,
    Full textEndNoteCitation
  3. Krzysztof Wegner, Jakub Stankowski, Olgierd Stankiewicz, Hubert Żabiński, Krzysztof Klimaszewski, Tomasz Grajek,
    High Frame-Rate Virtual View Synthesis Based on Low Frame-Rate Input,
    IEEE 22nd International Workshop on Multimedia Signal Processing, MMSP 2020, Tampere, Finland, 21-24 September 2020,
    Full textEndNoteCitation
  4. Krzysztof Wegner, Tomasz Grajek, Jakub Stankowski, Marek Domański,
    Video transrating in AVC to HEVC transcoding,
    25th International Conference on Systems, Signals and Image Processing, Maribor, Slovenia, 20-22 June 2018,
    Full textEndNoteCitationDOI
  5. Yasir Al-Obaidi, Tomasz Grajek, Olgierd Stankiewicz, Marek Domański,
    Bitrate Allocation for Multiview Video Plus Depth Simulcast Coding,
    25th International Conference on Systems, Signals and Image Processing, Maribor, Slovenia, 20-22 June 2018,
    Full textEndNoteCitation
  6. Krzysztof Wegner, Dominika Łosiewicz, Marek Domański, Adrian Dziembowski, Tomasz Grajek, Adam Grzelka, Dawid Mieloch, Robert Ratajczak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Real-time virtual navigation provision by simple means,
    International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
    EndNoteCitation
  7. Krzysztof Wegner, Dominika Łosiewicz, Tomasz Grajek, Olgierd Stankiewicz, Adrian Dziembowski, Marek Domański,
    Omnidirectional View Synthesis and Test Images,
    International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
    Full textEndNoteCitation
  8. Yasir Al-Obaidi, Tomasz Grajek,
    Influence of Depth Map Fidelity on Virtual View Quality,
    International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
    Full textEndNoteCitation
  9. Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek, Marek Domański,
    Depth estimation from stereoscopic 360-degree video,
    IEEE International Conference on Image Processing ICIP2018, Athens, Greece, 7-10 October 2018,
    Full textEndNoteCitation
  10. Marek Domański, Olgierd Stankiewicz, Krzysztof Wegner, Tomasz Grajek,
    Immersive visual media – MPEG-I: 360 video, virtual navigation and beyond,
    IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
    Full textEndNoteCitation
  11. Olgierd Stankiewicz, Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Tomasz Grajek,
    Encoding mode selection in HEVC with the use of noise reduction,
    IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
    Full textEndNoteCitation
  12. Krzysztof Wegner, Damian Karwowski, Krzysztof Klimaszewski, Jakub Stankowski, Olgierd Stankiewicz, Tomasz Grajek,
    Homogenous HEVC video transcoding by transform coefficient removal,
    IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
    Full textEndNoteCitation
  13. Jakub Stankowski, Damian Karwowski, Krzysztof Klimaszewski, Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek,
    Analysis of the complexity of the HEVC motion estimation,
    23rd International Conference on Systems, Signals and Image Processing, IWSSIP 2016, Bratislava, Slovakia, 23-25 May 2016, pp. 1-4, ISBN: 978-1-4673-9555-7 , ISSN: 2157-8702,
    Full textEndNoteCitationDOI
  14. Gauthier Lafruit, Marek Domański, Krzysztof Wegner, Tomasz Grajek, Takanori Senoh, Joel Jung, Peter Tamas Kovacs, Patrik Goorts, Lode Jorissen, Adrian Munteanu, Beerend Ceulemans, Pablo Carballeira, Sergio Garcia, Masayuki Tanimoto,
    New visual coding exploration in MPEG: Super-MultiView and Free Navigation in Free viewpoint TV,
    International Symposium on Electronic Imaging Science and Technology 2016, Stereoscopic Displays and Applications, San Francisco, California, USA, 14-18 February, 2016,
    Full textEndNoteCitation
  15. Jakub Stankowski, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Krzysztof Wegner,
    Computational complexity tradeoffs in HEVC motion estimation,
    International Conference on Signals and Electronic Systems, ICSES 2016, Kraków, Poland, September 5-7 2016, pp. 124-128, ISBN: 978-1-5090-2667-8,
    Full textEndNoteCitationDOI
  16. Jakub Stankowski, Cezary Korzeniewski, Marek Domański, Tomasz Grajek,
    Rate-distortion optimized quantization in HEVC: performance limitations,
    31st Picture Coding Symposium, PCS 2015, Cairns, Australia, 31 May - 3 June 2015, pp. 85-89,
    Full textEndNoteCitationDOI
  17. Jakub Stankowski, Damian Karwowski, Krzysztof Wegner, Olgierd Stankiewicz, Krzysztof Klimaszewski, Tomasz Grajek,
    Analysis of CABAC context models efficiency in the HEVC,
    57th International Symposium ELMAR-2015, Zadar, Croatia, 28-30 September 2015, pp. 217-220, ISBN: 978-953-184-209-9,
    Full textEndNoteCitationDOI
  18. Jakub Stankowski, Łukasz Kowalski, Jarosław Samelak, Marek Domański, Tomasz Grajek, Krzysztof Wegner,
    3D-HEVC Extension for Circular Camera Arrangements,
    3DTV Conference: The True Vision-Capture, Transmission and Display of 3D Video, 3DTV- Con 2015, Lisbon, Portugal, 8-10 July 2015,
    Full textEndNoteCitation
  19. Tomasz Grajek, Jakub Stankowski, Krzysztof Wegner, Marek Domański,
    Video quality in AVC homogenous transcoding,
    21st International Conference on Systems, Signals and Image Processing, IWSSIP 2014, Dubrovnik, Croatia, 12-15 May 2014, pp. 211-214,
    Full textEndNoteCitation
  20. Jakub Stankowski, Damian Karwowski, Tomasz Grajek, Krzysztof Wegner, Jakub Siast, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Bitrate Distribution of Syntax Elements in the HEVC Encoded Video,
    International Conference on Signals and Electronic Systems, ICSES 2014, Poznań, Poland, 11-13 September 2014, ISBN: 978-1-4799-7009-4,
    Full textEndNoteCitationDOI
  21. Jakub Stankowski, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Krzysztof Wegner, Marek Domański,
    Analysis of frame partitioning in HEVC,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2014, Warsaw, Poland, 15-17 September 2014, pp. 602-609,
    Full textEndNoteCitation
  22. Jakub Stankowski, Tomasz Grajek, Krzysztof Wegner, Marek Domański,
    Video Quality in Multiple HEVC Encoding-Decoding Cycles,
    20th International Conference on Systems, Signals and Image Processing, IWSSIP 2013, Bucharest, Romania, 7-9 July 2013, pp. 75-78, ISBN: 978-1-4799-0941-4,
    Full textEndNoteCitation
  23. Tomasz Grajek, Robert Ratajczak, Marek Domański, Krzysztof Wegner,
    Limitations of Vehicle Length Estimation Using Stereoscopic Video Analysis,
    20th International Conference on Systems, Signals and Image Processing, IWSSIP 2013, Bucharest, Romania, 7-9 July 2013, pp. 27-30, ISBN: 978-1-4799-0941-4,
    Full textEndNoteCitation
  24. Robert Ratajczak, Tomasz Grajek, Krzysztof Wegner, Krzysztof Klimaszewski, Maciej Kurc, Marek Domański,
    Vehicle Dimensions Estimation Scheme Using AAM on Stereoscopic Video,
    10th IEEE International Conference on Advanced Video and Signal-Based Surveillance, AVSS 2013, Workshop on Vehicle Retrieval in Surveillance (VRS) 2013, Kraków, Poland, 27-30 August 2013, pp. 478-482,
    Full textEndNoteCitation
  25. Jakub Stankowski, Tomasz Grajek, Marek Domański,
    Fast watermarking of MPEG-4 AVC/H.264 encoded HDTV video bitstreams,
    29th Picture Coding Symposium, PCS 2012, Kraków, Poland, 7-9 May 2012, pp. 265-268,
    Full textEndNoteCitationDOI
  26. Filip Lewandowski, Mateusz Paluszkiewicz, Tomasz Grajek, Krzysztof Wegner,
    Subjective Quality Assessment Methodology for 3D video Compression Technology ,
    International Conference on Signal and Electronics Systems, ICSES 2012, Wrocław, Poland, 18-21 September 2012, pp. 1-5, ISBN: 978-1-4673-1710-8,
    Full textEndNoteCitationDOI
  27. Adam Łuczak, Sławomir Maćkowiak, Damian Karwowski, Tomasz Grajek,
    A Large Barrel Distortion in an Acquisition System for Multifocal Images Extraction,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2012, Warsaw, Poland, 24-26 September 2012, pp. 164-171,
    Full textEndNoteCitation
  28. Adam Łuczak, Damian Karwowski, Sławomir Maćkowiak, Tomasz Grajek,
    Diamond scanning order of image blocks for massively parallel HEVC compression,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2012, Warsaw, Poland, 24-26 September 2012, pp. 172-179,
    Full textEndNoteCitation
  29. Tomasz Grajek, Damian Karwowski, Adam Łuczak, Sławomir Maćkowiak, Marek Domański,
    Architecture of Algorithmically Optimized MPEG-4 AVC/H.264 Video Encoder,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2012, Warsaw, Poland, 24-26 September 2012, pp. 79-86,
    Full textEndNoteCitation
  30. Tomasz Grajek, Marek Domański,
    New model of MPEG-4 AVC/H.264 video encoders,
    17th International Conference on Image Processing, ICIP 2010, Hong Kong, 26-29 September 2010, pp. 961-964, ISBN: 978-1-4244-7992-4,
    Full textEndNoteCitationDOI
  31. Tomasz Grajek, Marek Domański,
    Single Frame Rate-Quantization Model for MPEG-4 AVC/H.264 Video Encoders,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2010, Springer-Verlag, 20-22 September 2010, pp. 25-32,
    Full textEndNoteCitation
  32. Tomasz Grajek, Marek Domański,
    A global model of AVC/H.264 video encoders,
    27th Picture Coding Symposium, PCS 2009, Chicago, USA, 6-8 May 2009, pp. 1-4,
    Full textEndNoteCitationDOI
  33. Tomasz Grajek, Marek Domański,
    A Simple Quantitative Model of AVC/H.264 Video Coders,
    International Conference on Computer Vision and Graphics, Warsaw, Poland, 10-12 November 2008,
    Full textEndNoteCitation

International conferences - standardization

  1. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Basel Salahieh, Bart Sonneveldt, Gwangsoon Lee, Adrian Dziembowski, Renaud Dore,
    MIV anchors and crosscheck,
    MPEG129/m51560, Brussel, Belgium, January 2020,
    Full textEndNoteCitation
  2. Krzysztof Wegner, Tomasz Grajek, Adam Grzelka, Mateusz Lorkiewicz, Robert Ratajczak, Olgierd Stankiewicz, Jakub Stankowski, Hubert Żabiński, Marek Domański,
    Depth Estimation Reference Software extension for lightfield images,
    ISO/IEC JTC1/SC29/WG11 MPEG2019, m46126, Marrakech, Morocco, 13-19 January 2019,
    Full textEndNoteCitation
  3. Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek,
    Multiview compression of lightfield images,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M42309, San Diego, USA, 16-20 April 2018,
    Full textEndNoteCitation
  4. Michał Rzyp, Dawid Olejniczak, Marek Domański, Tomasz Grajek, Olgierd Stankiewicz, Krzysztof Wegner,
    Omnidirectional lightfield test image “Poznan_Lab_360”,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M42307, San Diego, USA, 16-20 April 2018,
    Full textEndNoteCitation
  5. Dominika Łosiewicz, Tomasz Grajek, Krzysztof Wegner, Adam Grzelka, Olgierd Stankiewicz, Marek Domański,
    360 degree test image with depth,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M41991, Gwangju, South Korea, 22-26 January 2018,
    Full textEndNoteCitation
  6. Marek Domański, Dominika Łosiewicz, Tomasz Grajek, Olgierd Stankiewicz, Krzysztof Wegner, Adrian Dziembowski, Dawid Mieloch,
    Extended VSRS for 360 degree video,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M41990, Gwangju, South Korea, 22-26 January 2018,
    Full textEndNoteCitation
  7. Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek, Marek Domański,
    Depth map formats used within MPEG 3D frameworks,
    ISO/IEC JTC1/SC29/WG11 MPEG2017, M40019, Geneva, Switzerland, 16-20 January 2017,
    Full textEndNoteCitation
  8. Gauthier Lafruit, Krzysztof Wegner, Tomasz Grajek, Takanori Senoh, Peter Kovacs, Patrik Goorts, Lode Jorissen, Beerend Ceulemans, Pablo Lopez, Sergio Lobo, Qing Wang, Joel Jung, Masayuki Tanimoto,
    FTV software user guidelines,
    ISO/IEC JTC1/SC29/WG11 MPEG2015, M36590, Warsaw, Poland, 20-27 June 2015,
    Full textEndNoteCitation
  9. Tomasz Grajek, Olgierd Stankiewicz, Krzysztof Wegner,
    Correlation analysis between MOS data collected on stereoscopic and autostereoscopic displays,
    Joint Collaborative Team on 3D Video Coding Extension Development of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 3rd Meeting, JCT3V-C0202, Geneva, Switzerland, 17-23 January 2013,
    Full textEndNoteCitation
  10. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Multiview HEVC – experimental results,
    Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11, MPEG 2011 / M22147, Geneva, Switzerland, 28 November - 02 December 2011,
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National journals

  1. Olgierd Stankiewicz, Krzysztof Wegner, Tomasz Grajek, Marek Domański,
    Nowe media immersyjne,
    Przegląd Telekomunikacyjny, Vol. 91, No. 6, 2018, pp. 397-400, ISSN: 1230-3496,
    Full textEndNoteCitationDOI
  2. Mateusz Sokołowski, Krzysztof Wegner, Tomasz Grajek,
    Prosty wielokamerowy system rejestracji obrazu na potrzeby badań nad telewizją swobodnego punktu widzenia,
    Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 413-416, ISSN: 1230-3496,
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  3. Hubert Żabiński, Krzysztof Wegner, Jakub Stankowski, Tomasz Grajek,
    Wpływ algorytmów demozaikowania na dokładność kalibracji systemów wielokamerowych,
    Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 475-478, ISSN: 1230-3496,
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  4. Tomasz Grajek, Maciej Celmer, Monika Trączyńska, Krzysztof Wegner,
    Optyczny skaner obiektów trójwymiarowych,
    Przegląd Telekomunikacyjny, No. 4/2015, April 2015, pp. 400-403,
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National conferences

  1. Tomasz Dzięcielewski, Tomasz Grajek, Jarosław Marek,
    Eksperymentalna analiza efektywności trybów kodowania międzyobrazowego w zaawansowanym koderze wizyjnym,
    Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji, KKRRiT 2006, Poznań, Poland, 7-9 czerwca 2006, pp. 219-222,
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  2. Tomasz Dzięcielewski, Tomasz Grajek, Jarosław Marek,
    Eksperymentalna analiza częstotliwości wyboru trybów zaawansowanego kodowania wizyjnego,
    X Poznańskie Warsztaty Telekomunikacyjne, PWT 2005, Poznań, Poland, 8-9 grudnia 2005, pp. 115-120,
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  3. Tomasz Grajek, Damian Karwowski,
    Złożoność obliczeniowa i efektywność kodowania entropijnego w standardzie H.264/AVC,
    Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji, KKRRiT 2005, Kraków, Poland, 15-17 czerwca 2005, pp. 377-380,
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Patents & Applications

  1. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for disoccluded region coding in a multiview video data stream,
    Patent office: USPTO, Status: granted,
    Application number: US 14/753010, Filling date: 29.06.2015,
    Publication number: US 2016/0381390, Publication date: 29.12.2016,
    Patent number: US 9992514, Date of Patent: 05.06.2018,
    EndNoteCitation
  2. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for depth-image-based rendering,
    Patent office: USPTO, Status: granted,
    Application number: US 14/753015, Filling date: 29.06.2015,
    Publication number: US 2016/0379341, Publication date: 29.12.2016,
    Patent number: US 9582859, Date of Patent: 28.02.2017,
    EndNoteCitation
  3. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A method for predictive coding of depth maps and a depth map encoder,
    Patent office: USPTO, Status: granted,
    Application number: US 14/753015, Filling date: 29.06.2015,
    Publication number: U S2016/0381387, Publication date: 29.12.2016,
    Patent number: US 9848205, Date of Patent: 19.12.2017,
    EndNoteCitation
  4. Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Adam Łuczak, Robert Ratajczak, Krzysztof Wegner,
    A system and method for object dimension estimation using 3D models,
    Patent office: USPTO, Status: granted,
    Application number: US 14/690484, Filling date: 20.04.2015,
    Patent number: US 9430850, Date of Patent: 30.08.2016,
    EndNoteCitation
  5. Adam Łuczak, Sławomir Maćkowiak, Marek Domański, Jakub Siast, Tomasz Grajek,
    A system and a method for tracking objects,
    Patent office: USPTO, Status: granted,
    Application number: US 14/664862, Filling date: 22.03.2015,
    Publication number: US 2016/0275695, Publication date: 22.09.2016,
    Patent number: US 9672634, Date of Patent: 06.06.2017,
    EndNoteCitation
  6. Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Maciej Kurc, Jakub Stankowski, Robert Ratajczak, Krzysztof Wegner,
    A system and method for object dimension estimation,
    Patent office: USPTO, Status: granted,
    Application number: US 14/664983, Filling date: 23.03.2015,
    Patent number: US 9384417, Date of Patent: 5.07.2016,
    EndNoteCitation
  7. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for generating a depth map,
    Patent office: USPTO, Status: granted,
    Application number: US 14/665004, Filling date: 23.03.2015,
    Publication number: US 2016/0275691, Publication date: 22.09.2016,
    Patent number: US 9646385, Date of Patent: 09.05.2017,
    EndNoteCitation
  8. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for disoccluded region coding in a multiview video data stream,
    Patent office: EPO, Status: granted,
    Application number: EP 15173955.4, Filling date: 26.06.2015,
    Publication number: EP 3110156A1, Publication date: 28.12.2016,
    Patent number: EP 3110156, Date of Patent: 14.03.2018,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation
  9. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for depth-image-based rendering,
    Patent office: EPO, Status: granted,
    Application number: EP 15461540.5, Filling date: 25.06.2015,
    Publication number: EP 3110149A1, Publication date: 28.12.2016,
    Patent number: EP 3110149, Date of Patent: 02.01.2019,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation
  10. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A method for predictive coding of depth maps and a depth map encoder,
    Patent office: EPO, Status: granted,
    Application number: EP 15461541.3, Filling date: 25.06.2015,
    Publication number: EP 3110155A1, Publication date: 28.12.2016,
    Patent number: EP 3110155, Date of Patent: 21.06.2017,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation
  11. Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Maciej Kurc, Jakub Stankowski, Robert Ratajczak, Krzysztof Wegner,
    A system and method for object dimension estimation,
    Patent office: EPO, Status: granted,
    Application number: EP 15160202.06, Filling date: 23.03.2015,
    Publication number: EP 3073442, Publication date: 28.09.2016,
    Patent number: EP 3073442, Date of Patent: 01.03.2017,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation

Dissertations

  1. Tomasz Grajek,
    Modelowanie zaawansowanych koderów wizyjnych,
    PhD Dissertation at Poznan University of Technology, Faculty of Electronics and Telecommunications, 2010,
    Supervisor: prof. dr hab. inż. Marek Domański, Reviewers: prof. dr hab. inż. Władysław Skarbek, prof. dr hab. inż. Ryszard Stasiński,
    Abstract (pol)Full text (pol)EndNoteCitation

2022

2021

  1. Marek Domański, Yasir Al-Obaidi, Tomasz Grajek,
    Universal modeling of monoscopic and multiview video codecs with applications to encoder control,
    IEEE International Conference on Image Processing ICIP2021, Anchorage-Alaska, USA, 19-22 September 2021,
    Full textEndNoteCitationDOI

2020

  1. Yasir Al-Obaidi, Tomasz Grajek,
    Estimation of the Optimum Depth Quantization Parameter for a Given Bitrate of Multiview Video plus Depth in 3D-HEVC Coding,
    28th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2020, Pilsen, Czech Republic, 19-21 June 2020,
    Full textEndNoteCitation

  2. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Basel Salahieh, Bart Sonneveldt, Gwangsoon Lee, Adrian Dziembowski, Renaud Dore,
    MIV anchors and crosscheck,
    MPEG129/m51560, Brussel, Belgium, January 2020,
    Full textEndNoteCitation

  3. Krzysztof Wegner, Jakub Stankowski, Olgierd Stankiewicz, Hubert Żabiński, Krzysztof Klimaszewski, Tomasz Grajek,
    High Frame-Rate Virtual View Synthesis Based on Low Frame-Rate Input,
    IEEE 22nd International Workshop on Multimedia Signal Processing, MMSP 2020, Tampere, Finland, 21-24 September 2020,
    Full textEndNoteCitation

2019

  1. Krzysztof Wegner, Tomasz Grajek, Adam Grzelka, Mateusz Lorkiewicz, Robert Ratajczak, Olgierd Stankiewicz, Jakub Stankowski, Hubert Żabiński, Marek Domański,
    Depth Estimation Reference Software extension for lightfield images,
    ISO/IEC JTC1/SC29/WG11 MPEG2019, m46126, Marrakech, Morocco, 13-19 January 2019,
    Full textEndNoteCitation

  2. Dragan Kukolj, Libor Bolecek, Ladislav Polak, Tomas Kratochvil, Ondrej Zach, Jan Kufa, Martin Slanina, Tomasz Grajek, Jarosław Samelak, Marek Domański, Dragorad A. Milovanovic,
    Chapter: 3D Content Acquisition and Coding,
    Book: 3D Visual Content Creation, Coding and Delivery, Editors: Pedro Amado Assunção, Atanas Gotchev,
    Signals and Communication Technology: Springer International, 2019, pp. 41-95, ISBN: 978-3-319-77841-9, ISSN: 1860-4862,
    EndNoteCitationDOI

  3. Marek Domański, Tomasz Grajek, Caroline Conti, Carl James Debono, Sérgio M. M. de Faria, Peter Kovacs, Luís F. R. Lucas, Paulo Nunes, Cristian Perra, Nuno M. M. Rodrigues, Mårten Sjöström, Luís Ducla Soares, Olgierd Stankiewicz,
    Chapter: Emerging Imaging Technologies: Trends and Challenges,
    Book: 3D Visual Content Creation, Coding and Delivery, Editors: Pedro Amado Assunção, Atanas Gotchev,
    Signals and Communication Technology: Springer International, 2019, pp. 5-39, ISBN: 978-3-319-77841-9, ISSN: 1860-4862,
    EndNoteCitationDOI

2018

  1. Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek,
    Multiview compression of lightfield images,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M42309, San Diego, USA, 16-20 April 2018,
    Full textEndNoteCitation

  2. Michał Rzyp, Dawid Olejniczak, Marek Domański, Tomasz Grajek, Olgierd Stankiewicz, Krzysztof Wegner,
    Omnidirectional lightfield test image “Poznan_Lab_360”,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M42307, San Diego, USA, 16-20 April 2018,
    Full textEndNoteCitation

  3. Dominika Łosiewicz, Tomasz Grajek, Krzysztof Wegner, Adam Grzelka, Olgierd Stankiewicz, Marek Domański,
    360 degree test image with depth,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M41991, Gwangju, South Korea, 22-26 January 2018,
    Full textEndNoteCitation

  4. Marek Domański, Dominika Łosiewicz, Tomasz Grajek, Olgierd Stankiewicz, Krzysztof Wegner, Adrian Dziembowski, Dawid Mieloch,
    Extended VSRS for 360 degree video,
    ISO/IEC JTC1/SC29/WG11 MPEG2018, M41990, Gwangju, South Korea, 22-26 January 2018,
    Full textEndNoteCitation

  5. Olgierd Stankiewicz, Krzysztof Wegner, Tomasz Grajek, Marek Domański,
    Nowe media immersyjne,
    Przegląd Telekomunikacyjny, Vol. 91, No. 6, 2018, pp. 397-400, ISSN: 1230-3496,
    Full textEndNoteCitationDOI

  6. Krzysztof Wegner, Tomasz Grajek, Jakub Stankowski, Marek Domański,
    Video transrating in AVC to HEVC transcoding,
    25th International Conference on Systems, Signals and Image Processing, Maribor, Slovenia, 20-22 June 2018,
    Full textEndNoteCitationDOI

  7. Yasir Al-Obaidi, Tomasz Grajek, Olgierd Stankiewicz, Marek Domański,
    Bitrate Allocation for Multiview Video Plus Depth Simulcast Coding,
    25th International Conference on Systems, Signals and Image Processing, Maribor, Slovenia, 20-22 June 2018,
    Full textEndNoteCitation

  8. Olgierd Stankiewicz, Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Tomasz Grajek,
    HEVC encoding assisted with noise reduction,
    International Journal of Electronics and Telecommunications, Vol. 64, No. 3, Electronics and Telecommunications Committee of Polish Academy of Sciences, Warsaw, 2018, pp. 285-292, ISSN: 0867-6747,
    Full textEndNoteCitationDOI

    Abstract

    Optimization of encoding process in video compression is an important research problem, especially in the case of modern, sophisticated compression technologies. In this paper, we consider HEVC, for which a novel method for selection of the encoding modes is proposed. By the encoding modes we mean e.g. coding block structure, prediction types and motion vectors. The proposed selection is done basing on noise-reduced version of the input sequence, while the information about the video itself, e.g. transform coefficients, is coded basing on the unaltered input. The proposed method involves encoding of two versions of the input sequence. Further, we show realization proving that the complexity is only negligibly higher than complexity of a single encoding. The proposal has been implemented in HEVC reference software from MPEG and tested experimentally. The results show that the proposal provides up to 1.5% bitrate reduction while preserving the same quality of a decoded video.

  9. Krzysztof Wegner, Dominika Łosiewicz, Marek Domański, Adrian Dziembowski, Tomasz Grajek, Adam Grzelka, Dawid Mieloch, Robert Ratajczak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Real-time virtual navigation provision by simple means,
    International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
    EndNoteCitation

    Abstract

    The paper reports the results on virtual navigation in a sports hall. The video data is gathered and processed off-line thus producing the multiview plus depth representation of a scene. This representation is an input to the rendering server. Even a typical PC computer is able to serve a number of users that freely and independently navigate in real - time and watch virtual video. The users are able to navigate in the scene changing the virtual viewpoint and virtual view direction. The service is provided through a webpage, so a viewer does not need to install any software on smartphone, tablet or notebook. The paper discusses the technical solutions together with the rationale for their choice.

  10. Krzysztof Wegner, Dominika Łosiewicz, Tomasz Grajek, Olgierd Stankiewicz, Adrian Dziembowski, Marek Domański,
    Omnidirectional View Synthesis and Test Images,
    International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
    Full textEndNoteCitation

    Abstract

    In this paper we introduce an algorithm for omnidirectional virtual view synthesis based on Omnidirectional Video plus Depth (OVD) format. The implementation is done on the basis of View Synthesis Reference Software (VSRS) developed by MPEG of ISO/IEC. Also, we address the problem of lack of benchmark data disallowing objective quality assessment. We present a method for generating test images in OVD representation along with example omnidirectional images and omnidirectional depths, called “Poznan Hall 360”.

  11. Yasir Al-Obaidi, Tomasz Grajek,
    Influence of Depth Map Fidelity on Virtual View Quality,
    International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
    Full textEndNoteCitation

    Abstract

    The paper deals with optimal bitrate distribution between video and depth maps in multiview compression. Influence of noise in depth data on the optimal bitrate allocation is studied. For simplicity simulcast approach is used. The results show that for high bitrates, virtual view quality depends on the depth map fidelity. However for low bitrates, this influence is negligibly small.

  12. Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek, Marek Domański,
    Depth estimation from stereoscopic 360-degree video,
    IEEE International Conference on Image Processing ICIP2018, Athens, Greece, 7-10 October 2018,
    Full textEndNoteCitation

2017

  1. Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Tomasz Grajek, Krzysztof Wegner, Olgierd Stankiewicz,
    Kodery wizyjne – podstawowe ograniczenia w praktycznym wykorzystaniu,
    Twierdza, Vol. 85, No. 1, 2017, ISSN: 1507-6474,
    EndNoteCitation

    Abstract

    Co 9-10 lat powstaje nowa technika kompresji ruchomego obrazu, która jest około 2-krotnie wydajniejsza niż poprzednia. Daje to możliwość przemysłowego wykorzystania coraz lepszych rozwiązań w zakresie kompresji, mimo że w praktyce wykorzystanie nowych koderów wiąże się z wieloma istotnymi ograniczeniami. O nich właśnie jest ten artykuł.

  2. Mateusz Sokołowski, Krzysztof Wegner, Tomasz Grajek,
    Prosty wielokamerowy system rejestracji obrazu na potrzeby badań nad telewizją swobodnego punktu widzenia,
    Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 413-416, ISSN: 1230-3496,
    Full textEndNoteCitation

  3. Hubert Żabiński, Krzysztof Wegner, Jakub Stankowski, Tomasz Grajek,
    Wpływ algorytmów demozaikowania na dokładność kalibracji systemów wielokamerowych,
    Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 475-478, ISSN: 1230-3496,
    Full textEndNoteCitation

  4. Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek, Marek Domański,
    Depth map formats used within MPEG 3D frameworks,
    ISO/IEC JTC1/SC29/WG11 MPEG2017, M40019, Geneva, Switzerland, 16-20 January 2017,
    Full textEndNoteCitation

  5. Marek Domański, Olgierd Stankiewicz, Krzysztof Wegner, Tomasz Grajek,
    Immersive visual media – MPEG-I: 360 video, virtual navigation and beyond,
    IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
    Full textEndNoteCitation

  6. Olgierd Stankiewicz, Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Tomasz Grajek,
    Encoding mode selection in HEVC with the use of noise reduction,
    IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
    Full textEndNoteCitation

  7. Krzysztof Wegner, Damian Karwowski, Krzysztof Klimaszewski, Jakub Stankowski, Olgierd Stankiewicz, Tomasz Grajek,
    Homogenous HEVC video transcoding by transform coefficient removal,
    IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
    Full textEndNoteCitation

2016

  1. Damian Karwowski, Krzysztof Klimaszewski, Jakub Stankowski, Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek,
    Transkodowanie obrazu – nieunikniona perspektywa w systemach dozoru wizyjnego,
    Twierdza, Vol. 82, No. 1, 2016, pp. 34-37, ISSN: 1507-6474,
    EndNoteCitation

    Abstract

    Z każdym rokiem możliwości układów obliczeniowych (procesorów, układów scalonych) znacznie się zwiększają. Prawo Moore’a mówi, że moc obliczeniowa układów podwaja się co 18-24 miesiące. Ten dynamiczny wzrost umożliwia praktyczne zastosowanie coraz to nowszych technik kompresji obrazu ruchomego, które zapewniają wyższą efektywność kompresji danych.

  2. Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Tomasz Grajek,
    Nowa technika optymalizacji działania kodera HEVC,
    Przegląd Telekomunikacyjny, Vol. 88, No. 6, 2016, pp. 237-240, ISSN: 1230-3496,
    Full textEndNoteCitation

    Abstract

    W pracy przedstawiono nową metodą szybkiego wyboru trybu kodowania wewnątrzobrazowego INTRA w koderze standardu HEVC. Podstawą opracowanej metody jest szczegółowa wiedza o częstości wybierania przez koder poszczególnych trybów kodowania wewnątrzobrazowego, w zależności od żądanej prędkości bitowej, rozdzielczości obrazu oraz jakości zakodowanego obrazu. Realizacja programowa opracowanej metody pozwoliła na pokazanie, że można płynnie regulować stopień przyspieszenia kodera i efektywność kodowania za jego pomocą.

  3. Marek Domański, Maciej Bartkowiak, Adrian Dziembowski, Tomasz Grajek, Adam Grzelka, Adam Łuczak, Dawid Mieloch, Jarosław Samelak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    New results in free-viewpoint television systems for horizontal virtual navigation,
    2016 IEEE International Conference on Multimedia and Expo ICME 2016, Seattle, USA, 11-15 July 2016,
    Full textEndNoteCitation

    Abstract

    The paper presents the concept of a practical free-viewpoint television system with purely optical depth estimation. The system consists of camera modules that contain pairs or triples of cameras together with the respective microphones. The camera modules can be sparsely located in arbitrary positions around a scene. Each camera module is equivalent to a video camera with a depth sensor and microphones. The hardware requirements, the video and audio processing algorithms and the preliminary experimental results are reported. In particular, for such systems, a compression technique is discussed that is more efficient than the new 3D-HEVC technology. A set of new test sequences obtained with the use of camera pairs are presented.

  4. Krzysztof Klimaszewski, Tomasz Grajek, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner, Damian Karwowski, Marek Domański,
    Pruning in picture reference list in HEVC,
    ISO/IEC JTC1/SC29/WG11 MPEG2016, M38245, Geneva, Switzerland, 30 May - 03 June 2016,
    Full textEndNoteCitation

    Abstract

    Possibility of selection of a particular reference picture from many previously encoded frames is one of the reasons of significant extension of time necessary for encoding of a video sequence with HEVC. Search of motion vectors within all available reference pictures for every PU (allowed by the HEVC standard) and selecting the best one, significantly enhances coding effectiveness but requires big computational effort leading to long encoding time. A fast method for selection of the best reference picture would be a source of shortening of the encoding time. This documents reports and verifies a method for fast reference picture selection in which reference picture list is pruned basing on the size of the PU under consideration. This way the number of reference picture necessary to look at the during motion vector search is reduced. Foundations of the reported method are the results of statistical analysis of the actual selected reference picture (considered by the encoder as the best in terms of RD) during encoding of the particular PU size.

  5. Jakub Stankowski, Damian Karwowski, Krzysztof Klimaszewski, Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek,
    Analysis of the complexity of the HEVC motion estimation,
    23rd International Conference on Systems, Signals and Image Processing, IWSSIP 2016, Bratislava, Slovakia, 23-25 May 2016, pp. 1-4, ISBN: 978-1-4673-9555-7 , ISSN: 2157-8702,
    Full textEndNoteCitationDOI

    Abstract

    The paper presents analysis and comparison of complexity of selected algorithms of motion estimation used in video compression. With the use of own, highly optimized software implementation the authors explored complexity of the methods applied in the framework of the new High Efficiency Video Compression (HEVC) technology. The influence of many different factors on motion estimation complexity has been deeply studied, including the implementation technique, type of the algorithm, number of processor threads used, kind of metric of blocks similarity. The results obtained allowed to formulate guidelines and conclusions that may be useful for future implementation of motion estimation algorithms in context of HEVC encoders.

  6. Damian Karwowski, Tomasz Grajek, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Chapter: 20 Years of Progress in Video Compression - from MPEG-1 to MPEG-H HEVC. General View on the Path of Video Coding Development,
    Book: Image Processing and Communications Challenges 8, Editors: Ryszard S. Choras,
    Advances in Intelligent Systems and Computing: No. 525, Springer International, 2016, pp. 3-15, ISBN: 978-3-319-47273-7, ISSN: 2194-5375,
    Full textEndNoteCitationDOI

    Abstract

    Compression of moving images has opened unprecedented opportunities of transmission and storage of digital video. Extraordinary performance of today’s video codecs is a result of tens of years of work on the development of methods of data encoding. This paper is an attempt to show this history of development. It highlights the history of individual algorithms of data encoding as well as the evolution of video compression technologies as a whole. With the development of successive technologies also functionalities of codecs were evolving, which make also the topic of the paper. The paper ends the attempt of authors’ forecasting about the future evolution of video compression technologies.

  7. Gauthier Lafruit, Marek Domański, Krzysztof Wegner, Tomasz Grajek, Takanori Senoh, Joel Jung, Peter Tamas Kovacs, Patrik Goorts, Lode Jorissen, Adrian Munteanu, Beerend Ceulemans, Pablo Carballeira, Sergio Garcia, Masayuki Tanimoto,
    New visual coding exploration in MPEG: Super-MultiView and Free Navigation in Free viewpoint TV,
    International Symposium on Electronic Imaging Science and Technology 2016, Stereoscopic Displays and Applications, San Francisco, California, USA, 14-18 February, 2016,
    Full textEndNoteCitation

    Abstract

    ISO/IEC MPEG and ITU-T VCEG have recently jointly issued a new multiview video compression standard, called 3D-HEVC, which reaches unpreceded compression performances for linear, dense camera arrangements. In view of supporting future high-quality, auto-stereoscopic 3D displays and Free Navigation virtual/augmented reality applications with sparse, arbitrarily arranged camera setups, innovative depth estimation and virtual view synthesis techniques with global optimizations over all camera views should be developed. Preliminary studies in response to the MPEG-FTV (Free viewpoint TV) Call for Evidence suggest these targets are within reach, with at least 6% bitrate gains over 3D-HEVC technology.

  8. Jakub Stankowski, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Krzysztof Wegner,
    Computational complexity tradeoffs in HEVC motion estimation,
    International Conference on Signals and Electronic Systems, ICSES 2016, Kraków, Poland, September 5-7 2016, pp. 124-128, ISBN: 978-1-5090-2667-8,
    Full textEndNoteCitationDOI

    Abstract

    The paper reports the results of the experiments conducted on the HEVC encoder, regarding the complexity and performance of the motion estimation algorithm. The research focuses on the search range of motion vectors and its influence on the encoding time of the video with the use of a HEVC encoder, as well as on the method for choosing the starting point of the motion estimation algorithm. Performance is measured as the time reduction and Bjontegaard metric bitrate reduction.

2015

  1. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for disoccluded region coding in a multiview video data stream,
    Patent office: USPTO, Status: granted,
    Application number: US 14/753010, Filling date: 29.06.2015,
    Publication number: US 2016/0381390, Publication date: 29.12.2016,
    Patent number: US 9992514, Date of Patent: 05.06.2018,
    EndNoteCitation

  2. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for depth-image-based rendering,
    Patent office: USPTO, Status: granted,
    Application number: US 14/753015, Filling date: 29.06.2015,
    Publication number: US 2016/0379341, Publication date: 29.12.2016,
    Patent number: US 9582859, Date of Patent: 28.02.2017,
    EndNoteCitation

  3. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A method for predictive coding of depth maps and a depth map encoder,
    Patent office: USPTO, Status: granted,
    Application number: US 14/753015, Filling date: 29.06.2015,
    Publication number: U S2016/0381387, Publication date: 29.12.2016,
    Patent number: US 9848205, Date of Patent: 19.12.2017,
    EndNoteCitation

  4. Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Adam Łuczak, Robert Ratajczak, Krzysztof Wegner,
    A system and method for object dimension estimation using 3D models,
    Patent office: USPTO, Status: granted,
    Application number: US 14/690484, Filling date: 20.04.2015,
    Patent number: US 9430850, Date of Patent: 30.08.2016,
    EndNoteCitation

  5. Adam Łuczak, Sławomir Maćkowiak, Marek Domański, Jakub Siast, Tomasz Grajek,
    A system and a method for tracking objects,
    Patent office: USPTO, Status: granted,
    Application number: US 14/664862, Filling date: 22.03.2015,
    Publication number: US 2016/0275695, Publication date: 22.09.2016,
    Patent number: US 9672634, Date of Patent: 06.06.2017,
    EndNoteCitation

  6. Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Maciej Kurc, Jakub Stankowski, Robert Ratajczak, Krzysztof Wegner,
    A system and method for object dimension estimation,
    Patent office: USPTO, Status: granted,
    Application number: US 14/664983, Filling date: 23.03.2015,
    Patent number: US 9384417, Date of Patent: 5.07.2016,
    EndNoteCitation

  7. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for generating a depth map,
    Patent office: USPTO, Status: granted,
    Application number: US 14/665004, Filling date: 23.03.2015,
    Publication number: US 2016/0275691, Publication date: 22.09.2016,
    Patent number: US 9646385, Date of Patent: 09.05.2017,
    EndNoteCitation

  8. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for disoccluded region coding in a multiview video data stream,
    Patent office: EPO, Status: granted,
    Application number: EP 15173955.4, Filling date: 26.06.2015,
    Publication number: EP 3110156A1, Publication date: 28.12.2016,
    Patent number: EP 3110156, Date of Patent: 14.03.2018,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation

  9. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A system and a method for depth-image-based rendering,
    Patent office: EPO, Status: granted,
    Application number: EP 15461540.5, Filling date: 25.06.2015,
    Publication number: EP 3110149A1, Publication date: 28.12.2016,
    Patent number: EP 3110149, Date of Patent: 02.01.2019,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation

  10. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    A method for predictive coding of depth maps and a depth map encoder,
    Patent office: EPO, Status: granted,
    Application number: EP 15461541.3, Filling date: 25.06.2015,
    Publication number: EP 3110155A1, Publication date: 28.12.2016,
    Patent number: EP 3110155, Date of Patent: 21.06.2017,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation

  11. Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Maciej Kurc, Jakub Stankowski, Robert Ratajczak, Krzysztof Wegner,
    A system and method for object dimension estimation,
    Patent office: EPO, Status: granted,
    Application number: EP 15160202.06, Filling date: 23.03.2015,
    Publication number: EP 3073442, Publication date: 28.09.2016,
    Patent number: EP 3073442, Date of Patent: 01.03.2017,
    Validated in: PL, DE, FR, GB,
    EndNoteCitation

  12. Damian Karwowski, Jakub Stankowski, Krzysztof Wegner, Olgierd Stankiewicz, Krzysztof Klimaszewski, Tomasz Grajek,
    HEVC. Nowe rozwiązania dla systemów dozoru wizyjnego,
    Twierdza, Vol. 81, No. 2, 2015, pp. 52-61, ISSN: 1507-6474,
    EndNoteCitation

    Abstract

    Technika HEVC (High Efficiency Video Coding) to nowy pomysł na kompresję obrazów. Jej bardzo wysoka efektywność kodowania obrazów pozwala przewidywać, że w ciągu kilku lat wyprze ona stosowaną obecnie technikę AVC. W efekcie firmy z branży IT będą zmuszone do aktualizacji swoich ofert handlowych i przejścia na nową technikę.

  13. Jakub Stankowski, Cezary Korzeniewski, Marek Domański, Tomasz Grajek,
    Rate-distortion optimized quantization in HEVC: performance limitations,
    31st Picture Coding Symposium, PCS 2015, Cairns, Australia, 31 May - 3 June 2015, pp. 85-89,
    Full textEndNoteCitationDOI

    Abstract

    Rate-Distortion Optimized Quantization (RDOQ) is an encoding optimization technique that may be modified with no implications to the bitstream compliance with the standard. In the paper, we propose an RDOQ variant with exact cost estimation resulting in higher compression ratios as compared to HEVC Test Model. This improvement is obtained at the cost of the complexity increase that may be scaled by replacing the individual steps of exact estimation by the simplified ones from HEVC Test Model. In that way, a family of RDOQ variants is created. The performance of the exact variant from this paper defines a kind of the performance limit for RDOQ.

  14. Marek Domański, Adrian Dziembowski, Tomasz Grajek, Adam Grzelka, Łukasz Kowalski, Maciej Kurc, Adam Łuczak, Dawid Mieloch, Robert Ratajczak, Jarosław Samelak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Methods of High Efficiency Compression for Transmission of Spatial Representation of Motion Scenes,
    IEEE International Conference on Multimedia and Expo ICME 2015, Torino, Italy, June 29-July 3 2015,
    Full textEndNoteCitation

    Abstract

    The paper reports the hitherto obtained results of the research project that deals with scene representations that are suitable for free navigation around the scene. These scene representations are acquired from a limited number of cameras located around the scene. The project is aimed at the development of an efficient compression technology and the experimental environment for testing such technology. The paper reports some new multiview test sequences with the circular camera arrangement, including the hybrid ones that have been acquired using also the depth sensors. Finally, the paper also briefly reports the recent results of the new compression technology being under development. This technology outperforms the state-of-the-art 3D-HEVC.

  15. Gauthier Lafruit, Krzysztof Wegner, Tomasz Grajek, Takanori Senoh, Peter Kovacs, Patrik Goorts, Lode Jorissen, Beerend Ceulemans, Pablo Lopez, Sergio Lobo, Qing Wang, Joel Jung, Masayuki Tanimoto,
    FTV software user guidelines,
    ISO/IEC JTC1/SC29/WG11 MPEG2015, M36590, Warsaw, Poland, 20-27 June 2015,
    Full textEndNoteCitation

  16. Tomasz Grajek, Maciej Celmer, Monika Trączyńska, Krzysztof Wegner,
    Optyczny skaner obiektów trójwymiarowych,
    Przegląd Telekomunikacyjny, No. 4/2015, April 2015, pp. 400-403,
    Full textEndNoteCitation

  17. Tomasz Grajek, Damian Karwowski, Jakub Stankowski,
    Chapter: Algorithmically optimized AVC video encoder with parallel processing of data,
    Book: Image Processing and Communications Challenges 7, Editors: Ryszard S. Choras,
    Advances in Intelligent Systems and Computing: No. 389, Springer International, 2015, pp. 97-104, ISBN: 978-3-319-23813-5, ISSN: 2194-5375,
    Full textEndNoteCitationDOI

    Abstract

    Algorithmically optimized AVC (MPEG-4 part 10/H.264) video encoder with parallel processing of data is presented in the paper. The paper reveals the architecture of the proposed encoder together with the description of the applied software optimization techniques. Conducted experiments show exactly the degree of parallelization of computations in the encoder and the compression performance of video encoding.

  18. Jakub Stankowski, Damian Karwowski, Tomasz Grajek, Krzysztof Wegner, Jakub Siast, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Analysis of Compressed Data Stream Content in HEVC Video Encoder,
    International Journal of Electronics and Telecommunications, Vol. 61, No. 2, Electronics and Telecommunications Committee of Polish Academy of Sciences, Warsaw, 2015, pp. 121-127, ISSN: 0867-6747,
    Full textEndNoteCitationDOI

    Abstract

    In this paper, a detailed analysis of the content of the bitstream, produced by the HEVC video encoder is presented. With the use of the HM 10.0 reference software the following statistics were investigated: 1) the amount of data in the encoded stream related to individual frame types, 2) the relationship between the value of the QP and the size of the bitstream at the output of the encoder, 3) contribution of individual types of data to I and B frames. The above mentioned aspects have been thoroughly explored for a wide range of target bitrates. The obtained results became the basis for highlighting guidelines that allow for efficient bitrate control in the HEVC encoder.

  19. Krzysztof Wegner, Tomasz Grajek, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Multi-Generation Encoding Using HEVC All Intra Versus JPEG 2000,
    57th International Symposium ELMAR-2015, Zadar, Croatia, 28-30 September 2015, pp. 41-44, ISBN: 978-953-184-209-9,
    Full textEndNoteCitationDOI

    Abstract

    For the new HEVC compression technology, the analysis of accumulation of quality losses in multi-generation coding is still an open problem. In this paper, we describe the results of extensive experiments that demonstrate quality loss accumulation in 300 encoding-decoding cycles using the HEVC codec in the All Intra mode. For consecutive encoding cycles with constant encoder configuration, the coding quality loss decrease much slower than for JPEG 2000. However, for SD resolution, the HEVC intra-only encoder provides lower bitrates than JPEG 2000 with the same video quality. Therefore, even after 300 cycles, the HEVC All Intra usually provides lower bitrates than JPEG 2000 with the same decoded-video quality.

  20. Jakub Stankowski, Damian Karwowski, Krzysztof Wegner, Olgierd Stankiewicz, Krzysztof Klimaszewski, Tomasz Grajek,
    Analysis of CABAC context models efficiency in the HEVC,
    57th International Symposium ELMAR-2015, Zadar, Croatia, 28-30 September 2015, pp. 217-220, ISBN: 978-953-184-209-9,
    Full textEndNoteCitationDOI

    Abstract

    This paper presents detailed analysis of the CABAC efficiency when operating in the HEVC in a number of bits per number of bins manner. The paper reveals what fraction of bit is produced by the CABAC for each and every binary symbols encoded in HEVC. The statistics of bins encoded with a given efficiency are presented for the three types of video data: 1) prediction error of image samples, 2) motion data, and 3) control data.

  21. Jakub Stankowski, Łukasz Kowalski, Jarosław Samelak, Marek Domański, Tomasz Grajek, Krzysztof Wegner,
    3D-HEVC Extension for Circular Camera Arrangements,
    3DTV Conference: The True Vision-Capture, Transmission and Display of 3D Video, 3DTV- Con 2015, Lisbon, Portugal, 8-10 July 2015,
    Full textEndNoteCitation

2014

  1. Tomasz Grajek, Jakub Stankowski, Krzysztof Wegner, Marek Domański,
    Video quality in AVC homogenous transcoding,
    21st International Conference on Systems, Signals and Image Processing, IWSSIP 2014, Dubrovnik, Croatia, 12-15 May 2014, pp. 211-214,
    Full textEndNoteCitation

    Abstract

    In this paper the results obtained for homogenous Cascaded Pixel Domain Transcoder of AVC bitstreams are reported in order to show the expected transcoding efficiency gain/loss. A wide set of test video sequences has been used in experiments and in total 19200 bitstreams have been encoded and examined. It has been proved that there is a universal dependency between the quality, defined as ΔPSNR and bitstream reduction. ΔPSNR is described as the difference between quality of the transcoded material and the original material that could potentially be encoded at the same bitrate as the transcoded one.

  2. Jakub Stankowski, Damian Karwowski, Tomasz Grajek, Krzysztof Wegner, Jakub Siast, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Bitrate Distribution of Syntax Elements in the HEVC Encoded Video,
    International Conference on Signals and Electronic Systems, ICSES 2014, Poznań, Poland, 11-13 September 2014, ISBN: 978-1-4799-7009-4,
    Full textEndNoteCitationDOI

    Abstract

    The paper focuses on two problems: 1) analysis of bitrate contribution of I and B frames in encoded HEVC data stream, and 2) analysis of distribution of HEVC syntax elements in I and B frames. The relationship between sizes of I and B frames located at a different levels in hierarchical coding scheme was experimentally determined, as well as contribution of HEVC syntax elements in encoded streams of I, B0, B1, B2, and B3 frames. The results are presented in the paper. All presented results concern a wide range of QP values in a video encoder.

  3. Jakub Stankowski, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Krzysztof Wegner, Marek Domański,
    Analysis of frame partitioning in HEVC,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2014, Warsaw, Poland, 15-17 September 2014, pp. 602-609,
    Full textEndNoteCitation

    Abstract

    The paper presents analysis of frame partitioning in the next generation video coding standard HEVC. Complex study on frequency of the particular coding unit, prediction unit and transform unit sizes selection made by the encoder compliant with HEVC technology is included. General conclusions based on extensive experiments for HD video sequences are presented. Such knowledge may be the first step to the development of more efficient mode selection algorithms.

2013

  1. Jakub Siast, Jakub Stankowski, Tomasz Grajek, Marek Domański,
    Digital Watermarking with Local Strength Adjustment for AVC-Compressed HDTV Bitstreams,
    30th Picture Coding Symposium, PCS 2013, San Jose, CA, USA, 8-11 December 2013, pp. 53-56,
    Full textEndNoteCitationDOI

    Abstract

    A computationally inexpensive watermark schema for MPEG-4 AVC/H.264 streams that use local mark strength adjustment minimizing visible artifacts is presented. The local mark strength adjustment mechanism and watermark embedding mechanism operate on residual data. This approach minimize the number of operations needed for video bitstream decoding and subsequent watermarked video data encoding. The experimental results included herein, described for real-world MPEG4 AVC/H.264 encoded HDTV video bitstreams prove its robustness to complex attacks, especially camcorder recording attack.

  2. Filip Lewandowski, Mateusz Paluszkiewicz, Tomasz Grajek, Krzysztof Wegner,
    Methodology for 3D video subjective quality evaluation,
    International Journal of Electronics and Telecommunications, Vol. 59, No. 1, 2013, pp. 25-32,
    Full textEndNoteCitation

  3. Tomasz Grajek, Olgierd Stankiewicz, Krzysztof Wegner,
    Correlation analysis between MOS data collected on stereoscopic and autostereoscopic displays,
    Joint Collaborative Team on 3D Video Coding Extension Development of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 3rd Meeting, JCT3V-C0202, Geneva, Switzerland, 17-23 January 2013,
    Full textEndNoteCitation

  4. Jakub Stankowski, Tomasz Grajek, Krzysztof Wegner, Marek Domański,
    Video Quality in Multiple HEVC Encoding-Decoding Cycles,
    20th International Conference on Systems, Signals and Image Processing, IWSSIP 2013, Bucharest, Romania, 7-9 July 2013, pp. 75-78, ISBN: 978-1-4799-0941-4,
    Full textEndNoteCitation

  5. Tomasz Grajek, Robert Ratajczak, Marek Domański, Krzysztof Wegner,
    Limitations of Vehicle Length Estimation Using Stereoscopic Video Analysis,
    20th International Conference on Systems, Signals and Image Processing, IWSSIP 2013, Bucharest, Romania, 7-9 July 2013, pp. 27-30, ISBN: 978-1-4799-0941-4,
    Full textEndNoteCitation

  6. Marek Domański, Olgierd Stankiewicz, Krzysztof Wegner, Maciej Kurc, Jacek Konieczny, Jakub Siast, Jakub Stankowski, Robert Ratajczak, Tomasz Grajek,
    High Efficiency 3D Video Coding Using New Tools Based on View Synthesis,
    IEEE Transactions on Image Processing, Special Issue on 3D Video Representation, Compression, & Rendering, Vol. 22, No. 9, September 2013, pp. 3517-3527,
    Full textEndNoteCitationDOI

    Abstract

    We propose a new coding technology for 3D video represented by multiple views and the respective depth maps. The proposed technology is demonstrated as an extension of the recently developed high efficiency video coding (HEVC). One base views are compressed into a standard bitstream (like in HEVC). The remaining views and the depth maps are compressed using new coding tools that mostly rely on view synthesis. In the decoder, those views and the depth maps are derived via synthesis in the 3D space from the decoded baseview and from data corresponding to small disoccluded regions. The shapes and locations of those disoccluded regions can be derived by the decoder without any side information transmitted. To achieve high compression efficiency, we propose several new tools such as depth-based motion prediction, joint high frequency layer coding, consistent depth representation, and nonlinear depth representation. The experiments show high compression efficiency of the proposed technology. The bitrate needed for transmission of two side views with depth maps is mostly less than 50% than that of the bitrate for a single-view video.

  7. Robert Ratajczak, Tomasz Grajek, Krzysztof Wegner, Krzysztof Klimaszewski, Maciej Kurc, Marek Domański,
    Vehicle Dimensions Estimation Scheme Using AAM on Stereoscopic Video,
    10th IEEE International Conference on Advanced Video and Signal-Based Surveillance, AVSS 2013, Workshop on Vehicle Retrieval in Surveillance (VRS) 2013, Kraków, Poland, 27-30 August 2013, pp. 478-482,
    Full textEndNoteCitation

2012

  1. Jakub Stankowski, Tomasz Grajek, Marek Domański,
    Fast watermarking of MPEG-4 AVC/H.264 encoded HDTV video bitstreams,
    29th Picture Coding Symposium, PCS 2012, Kraków, Poland, 7-9 May 2012, pp. 265-268,
    Full textEndNoteCitationDOI

    Abstract

    The paper describes watermarking of compressed video bitstreams. This technique is proven to be very fast and robust against various attacks including camcorder recording attack. The watermark is embedded using indirect modifications of transform coefficients in selected P- and B-frames. In the watermarked bitstream there exist sequences of watermarked pictures interleaved with sequences of unmodified pictures. The unmodified pictures serve as a reference for the watermark detection. The experimental results described for real-world MPEG-4 AVC/H.264 encoded HDTV video bitstreams are included.

  2. Filip Lewandowski, Mateusz Paluszkiewicz, Tomasz Grajek, Krzysztof Wegner,
    Subjective Quality Assessment Methodology for 3D video Compression Technology ,
    International Conference on Signal and Electronics Systems, ICSES 2012, Wrocław, Poland, 18-21 September 2012, pp. 1-5, ISBN: 978-1-4673-1710-8,
    Full textEndNoteCitationDOI

  3. Adam Łuczak, Sławomir Maćkowiak, Damian Karwowski, Tomasz Grajek,
    A Large Barrel Distortion in an Acquisition System for Multifocal Images Extraction,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2012, Warsaw, Poland, 24-26 September 2012, pp. 164-171,
    Full textEndNoteCitation

  4. Adam Łuczak, Damian Karwowski, Sławomir Maćkowiak, Tomasz Grajek,
    Diamond scanning order of image blocks for massively parallel HEVC compression,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2012, Warsaw, Poland, 24-26 September 2012, pp. 172-179,
    Full textEndNoteCitation

  5. Tomasz Grajek, Damian Karwowski, Adam Łuczak, Sławomir Maćkowiak, Marek Domański,
    Architecture of Algorithmically Optimized MPEG-4 AVC/H.264 Video Encoder,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2012, Warsaw, Poland, 24-26 September 2012, pp. 79-86,
    Full textEndNoteCitation

2011

  1. Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Multiview HEVC – experimental results,
    Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11, MPEG 2011 / M22147, Geneva, Switzerland, 28 November - 02 December 2011,
    Full textEndNoteCitation

2010

  1. Tomasz Grajek,
    Modelowanie zaawansowanych koderów wizyjnych,
    PhD Dissertation at Poznan University of Technology, Faculty of Electronics and Telecommunications, 2010,
    Supervisor: prof. dr hab. inż. Marek Domański, Reviewers: prof. dr hab. inż. Władysław Skarbek, prof. dr hab. inż. Ryszard Stasiński,
    Abstract (pol)Full text (pol)EndNoteCitation

  2. Tomasz Grajek, Marek Domański,
    New model of MPEG-4 AVC/H.264 video encoders,
    17th International Conference on Image Processing, ICIP 2010, Hong Kong, 26-29 September 2010, pp. 961-964, ISBN: 978-1-4244-7992-4,
    Full textEndNoteCitationDOI

  3. Tomasz Grajek, Marek Domański,
    Single Frame Rate-Quantization Model for MPEG-4 AVC/H.264 Video Encoders,
    Lecture Notes in Computer Science, Proceedings of International Conference on Computer Vision and Graphics ICCVG 2010, Springer-Verlag, 20-22 September 2010, pp. 25-32,
    Full textEndNoteCitation

2009

  1. Tomasz Grajek, Marek Domański,
    A global model of AVC/H.264 video encoders,
    27th Picture Coding Symposium, PCS 2009, Chicago, USA, 6-8 May 2009, pp. 1-4,
    Full textEndNoteCitationDOI

2008

  1. Tomasz Grajek, Marek Domański,
    A Simple Quantitative Model of AVC/H.264 Video Coders,
    International Conference on Computer Vision and Graphics, Warsaw, Poland, 10-12 November 2008,
    Full textEndNoteCitation

2006

  1. Tomasz Dzięcielewski, Tomasz Grajek, Jarosław Marek,
    Eksperymentalna analiza efektywności trybów kodowania międzyobrazowego w zaawansowanym koderze wizyjnym,
    Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji, KKRRiT 2006, Poznań, Poland, 7-9 czerwca 2006, pp. 219-222,
    Full textEndNoteCitation

2005

  1. Tomasz Dzięcielewski, Tomasz Grajek, Jarosław Marek,
    Eksperymentalna analiza częstotliwości wyboru trybów zaawansowanego kodowania wizyjnego,
    X Poznańskie Warsztaty Telekomunikacyjne, PWT 2005, Poznań, Poland, 8-9 grudnia 2005, pp. 115-120,
    Full textEndNoteCitation

  2. Tomasz Grajek, Damian Karwowski,
    Złożoność obliczeniowa i efektywność kodowania entropijnego w standardzie H.264/AVC,
    Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji, KKRRiT 2005, Kraków, Poland, 15-17 czerwca 2005, pp. 377-380,
    Full textEndNoteCitation