Chair of Multimedia Telecommunications and Microelectronics


Krzysztof Klimaszewski

Krzysztof Klimaszewski


(born 1981) received M.Sc. degree from Poznan University of Technology in 2005 and Ph.D. in 2012. The main area of his professional activities is video compression in multipoint view systems. He is interested in historical and modern technology, and also designing and programming electronic circuits.

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Contact

Room: 108 (Polanka)
Phone: +48 61 665 3843
Mail: kklima@multimedia.edu.pl
www: http://cygnus.et.put.poznan.pl/~kklima

Duty hours

Tue 15:15 - 16:00, Thu 14:15 - 15:00

Awards

Research projects

Publications

Book chapters

  1. Carl James Debono, Marek Domański, Sérgio M. M. de Faria, Krzysztof Klimaszewski, Luís F. R. Lucas, Nuno M. M. Rodrigues, Krzysztof Wegner,
    Chapter: Efficient Depth-Based Coding,
    Book: 3D Visual Content Creation, Coding and Delivery, Editors: Pedro Amado Assunção, Atanas Gotchev,
    Signals and Communication Technology: Springer International, 2019, pp. 97-114, ISBN: 978-3-319-77841-9, ISSN: 1860-4862,
    EndNoteCitationDOI
  2. Jakub Stankowski, Mateusz Lorkiewicz, Krzysztof Klimaszewski,
    Chapter: System architecture for real-time comparison of audio streams for broadcast supervision,
    Book: Image Processing and Communications Challenges 10, Editors: Michał Choraś, Ryszard S. Choraś,
    Advances in Intelligent Systems and Computing: Vol. 892, Springer, November 2018, pp. 245-252, ISBN: 978-3-030-03658-4,
    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. Marek Domański, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Chapter: Efficient Transmission of 3D Video Using MPEG-4 AVC/H.264 Compression Technology,
    Book: Computer Communication Networks and Telecommunications, Editors: Zeadally, Sherali and Cerqueira, Eduardo and Curado, Marília and Leszczuk, Mikołaj,
    Lecture Notes in Computer Science: Vol. 6157, Springer Berlin Heidelberg, Berlin, 2010, pp. 145-156, ISBN: 978-3-642-13788-4, ISSN: 0302-9743,
    Full textEndNoteCitationDOI
  5. Jakub Stankowski, Krzysztof Klimaszewski,
    Chapter: Application of epipolar rectification algorithm in 3D Television,
    Book: Image Processing and Communications Challenges 2,
    Advances in Intelligent and Soft Computing: Vol. 84, Springer-Verlag, Berlin, 2010, pp. 345-352, ISBN: 978-3-642-16294-7, ISSN: 1867-5662,
    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. Krzysztof Klimaszewski,
    Disparity prediction in multiview coding,
    Poznań University of Technology Academic Journals - Electrical Engineering, No. 54, 2007, pp. 89-96,
    EndNoteCitation

International conferences

  1. 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
  2. Mateusz Lorkiewicz, Jakub Stankowski, Krzysztof Klimaszewski,
    Algorithm for real-time comparison of audio streams for broadcast supervision,
    25th International Conference on Systems, Signals and Image Processing, Maribor, Slovenia, 20-22 June 2018,
    Full textEndNoteCitation
  3. 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
  4. 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
  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
  6. 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
  7. 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
  8. Krzysztof Klimaszewski, Krzysztof Wegner, Marek Domański,
    Video and depth bitrate allocation in multiview compression,
    21st International Conference on Systems, Signals and Image Processing, IWSSIP 2014, Dubrovnik, Croatia, 12-15 May 2014,
    Full textEndNoteCitation
  9. 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
  10. 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
  11. 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
  12. Sandra Cancino-Suarez, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Enhancement of Stereoscopic Depth Estimation by the Use of Motion Information,
    44th IEEE Southeastern Symposium on System Theory, Jacksonville, FL, USA, 11-13 March 2012, pp. 94-98,
    Full textEndNoteCitation
  13. Krzysztof Klimaszewski, Krzysztof Wegner,
    Joint Intra Coding of Video and Depth Maps,
    IEEE International Conference on Signals and Electronic Systems – ICSES 2010, Gliwice, Poland, 7-10 September 2010,
    EndNoteCitation
  14. Marek Domański, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Olgierd Stankiewicz, Krzysztof Wegner,
    An experimental Free-view Television System,
    1st International Conference on Image Processing & Communications (IPC), Bydgoszcz, Polska, September 2009, pp. 175-184,
    Full textEndNoteCitation
  15. Krzysztof Klimaszewski, Krzysztof Wegner, Marek Domański,
    Distortions of synthesized views caused by compression of views and depth maps,
    3DTV-Conference 2009 The True Vision Capture, Transmission and Display of 3D Video, Potsdam, Germany, 4-6 May 2009,
    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 Klimaszewski, Krzysztof Wegner, Olgierd Stankiewicz, Marek Domański,
    3DV/FTV EE4 report on Poznan Street sequence,
    ISO/IEC JTC1/SC29/WG11 MPEG 2011/M19392, m19392, Daegu, South Korea, 24-28 January 2011,
    EndNoteCitation
  3. 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
  4. Krzysztof Klimaszewski,
    Cross-check results of CE2 on Multi-view Video Coding,
    ISO/IEC JTC1/SC29/WG11 MPEG2006, m13726, Klagenfurt, Austria, July 2006,
    EndNoteCitation

National journals

  1. Marek Domański, Adam Łuczak, Krzysztof Klimaszewski,
    Telewizja swobodnego punktu widzenia,
    Przegląd Telekomunikacyjny, No. 2-3, February/March 2013, pp. 84-86,
    EndNoteCitation

National conferences

  1. Krzysztof Klimaszewski,
    Ocena efektywności kompresji sekwencji wielowidokowych ,
    Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji KKRRiT 2008, Wrocław, Poland, 9-11 April 2008,
    EndNoteCitation

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. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. Marek Domański, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Image coding method,
    Patent office: USPTO, Status: granted,
    Application number: US 13/680652, Filling date: 19.11.2012,
    Publication number: US 2013/0129235A1, Publication date: 23.05.2013,
    Patent number: US 8761527, Date of Patent: 24.06.2014,
    EndNoteCitation

Dissertations

  1. Krzysztof Klimaszewski,
    Algorytmy kompresji sekwencji wielowidokowych,
    PhD Dissertation at Poznan University of Technology, Faculty of Electronics and Telecommunications, 2012,
    Supervisor: prof. dr hab. inż. Marek Domański, Reviewers: dr hab. inż. Artur Przelaskowski, prof. dr hab. inż. Ryszard Stasiński,
    Abstract (pol)Full text (pol)EndNoteCitation

2020

  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, 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. Carl James Debono, Marek Domański, Sérgio M. M. de Faria, Krzysztof Klimaszewski, Luís F. R. Lucas, Nuno M. M. Rodrigues, Krzysztof Wegner,
    Chapter: Efficient Depth-Based Coding,
    Book: 3D Visual Content Creation, Coding and Delivery, Editors: Pedro Amado Assunção, Atanas Gotchev,
    Signals and Communication Technology: Springer International, 2019, pp. 97-114, ISBN: 978-3-319-77841-9, ISSN: 1860-4862,
    EndNoteCitationDOI

2018

  1. Jakub Stankowski, Mateusz Lorkiewicz, Krzysztof Klimaszewski,
    Chapter: System architecture for real-time comparison of audio streams for broadcast supervision,
    Book: Image Processing and Communications Challenges 10, Editors: Michał Choraś, Ryszard S. Choraś,
    Advances in Intelligent Systems and Computing: Vol. 892, Springer, November 2018, pp. 245-252, ISBN: 978-3-030-03658-4,
    EndNoteCitationDOI

  2. Mateusz Lorkiewicz, Jakub Stankowski, Krzysztof Klimaszewski,
    Algorithm for real-time comparison of audio streams for broadcast supervision,
    25th International Conference on Systems, Signals and Image Processing, Maribor, Slovenia, 20-22 June 2018,
    Full textEndNoteCitation

  3. 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.

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. 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

  3. 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. 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.

  4. 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.

  5. 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.

  6. 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. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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.

  12. 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.

  13. 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.

  14. 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.

2014

  1. Krzysztof Klimaszewski, Krzysztof Wegner, Marek Domański,
    Video and depth bitrate allocation in multiview compression,
    21st International Conference on Systems, Signals and Image Processing, IWSSIP 2014, Dubrovnik, Croatia, 12-15 May 2014,
    Full textEndNoteCitation

  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. Marek Domański, Adam Łuczak, Krzysztof Klimaszewski,
    Telewizja swobodnego punktu widzenia,
    Przegląd Telekomunikacyjny, No. 2-3, February/March 2013, pp. 84-86,
    EndNoteCitation

  2. 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. Krzysztof Klimaszewski,
    Algorytmy kompresji sekwencji wielowidokowych,
    PhD Dissertation at Poznan University of Technology, Faculty of Electronics and Telecommunications, 2012,
    Supervisor: prof. dr hab. inż. Marek Domański, Reviewers: dr hab. inż. Artur Przelaskowski, prof. dr hab. inż. Ryszard Stasiński,
    Abstract (pol)Full text (pol)EndNoteCitation

  2. Marek Domański, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Image coding method,
    Patent office: USPTO, Status: granted,
    Application number: US 13/680652, Filling date: 19.11.2012,
    Publication number: US 2013/0129235A1, Publication date: 23.05.2013,
    Patent number: US 8761527, Date of Patent: 24.06.2014,
    EndNoteCitation

    Abstract

    An image coding method. The method includes encoding a first image, the first image having a reduced spatial resolution relative to an input image, wherein values of the first image depend on energy of corresponding areas of the input image, and encoding a first shape information of the shape of a spatial spectrum of the input image. The method further includes reconstructing a second image from the encoded first image, reconstructing a second shape information from the encoded first shape information, and generating a noise image having an intensity described by the second image and having a spectrum shape described by the second shape information.

  3. Sandra Cancino-Suarez, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
    Enhancement of Stereoscopic Depth Estimation by the Use of Motion Information,
    44th IEEE Southeastern Symposium on System Theory, Jacksonville, FL, USA, 11-13 March 2012, pp. 94-98,
    Full textEndNoteCitation

2011

  1. Krzysztof Klimaszewski, Krzysztof Wegner, Olgierd Stankiewicz, Marek Domański,
    3DV/FTV EE4 report on Poznan Street sequence,
    ISO/IEC JTC1/SC29/WG11 MPEG 2011/M19392, m19392, Daegu, South Korea, 24-28 January 2011,
    EndNoteCitation

  2. 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. Krzysztof Klimaszewski, Krzysztof Wegner,
    Joint Intra Coding of Video and Depth Maps,
    IEEE International Conference on Signals and Electronic Systems – ICSES 2010, Gliwice, Poland, 7-10 September 2010,
    EndNoteCitation

  2. Marek Domański, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
    Chapter: Efficient Transmission of 3D Video Using MPEG-4 AVC/H.264 Compression Technology,
    Book: Computer Communication Networks and Telecommunications, Editors: Zeadally, Sherali and Cerqueira, Eduardo and Curado, Marília and Leszczuk, Mikołaj,
    Lecture Notes in Computer Science: Vol. 6157, Springer Berlin Heidelberg, Berlin, 2010, pp. 145-156, ISBN: 978-3-642-13788-4, ISSN: 0302-9743,
    Full textEndNoteCitationDOI

    Abstract

    At a receiver terminal, true 3D video provides ability to watch views selected from a large number of available views. Such ability is needed for the forthcoming 3D video applications like free-view television, autostereoscopic displays etc. Delivery of many views through communication channels is a challenging problem that has to be solved in the near future. In this paper, we study delivery of real 3D video using the state-of-the-art compression technology. Considered are the issues related to 3D video data model as well its application for generation of video from arbitrary virtual viewpoint. Included are respective experimental results.

  3. Jakub Stankowski, Krzysztof Klimaszewski,
    Chapter: Application of epipolar rectification algorithm in 3D Television,
    Book: Image Processing and Communications Challenges 2,
    Advances in Intelligent and Soft Computing: Vol. 84, Springer-Verlag, Berlin, 2010, pp. 345-352, ISBN: 978-3-642-16294-7, ISSN: 1867-5662,
    Full textEndNoteCitationDOI

    Abstract

    In the paper a method for performing rectifcation of video from cameras in 3D television parallel multi-camera setups is presented. Using the camera calibration data gathered, a new coordinate system is calculated, in which virtual camera positions and orientations are calculated. A rectifying perspective transform is calculated that performs transformation from the real camera coordinate system to a new system. Transformed images correspond to images from virtual rectifed camera setup. The results obtained using the method described are verifed by com putation of depth maps using the rectifed video.

2009

  1. Marek Domański, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Olgierd Stankiewicz, Krzysztof Wegner,
    An experimental Free-view Television System,
    1st International Conference on Image Processing & Communications (IPC), Bydgoszcz, Polska, September 2009, pp. 175-184,
    Full textEndNoteCitation

  2. Krzysztof Klimaszewski, Krzysztof Wegner, Marek Domański,
    Distortions of synthesized views caused by compression of views and depth maps,
    3DTV-Conference 2009 The True Vision Capture, Transmission and Display of 3D Video, Potsdam, Germany, 4-6 May 2009,
    Full textEndNoteCitation

2008

  1. Krzysztof Klimaszewski,
    Ocena efektywności kompresji sekwencji wielowidokowych ,
    Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji KKRRiT 2008, Wrocław, Poland, 9-11 April 2008,
    EndNoteCitation

2007

  1. Krzysztof Klimaszewski,
    Disparity prediction in multiview coding,
    Poznań University of Technology Academic Journals - Electrical Engineering, No. 54, 2007, pp. 89-96,
    EndNoteCitation

2006

  1. Krzysztof Klimaszewski,
    Cross-check results of CE2 on Multi-view Video Coding,
    ISO/IEC JTC1/SC29/WG11 MPEG2006, m13726, Klagenfurt, Austria, July 2006,
    EndNoteCitation