Tomasz Grajek, Jakub Stankowski,
Rate-Distortion Optimized Quantization in Motion JPEG,
30th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision : WSCG 2022, 2022, ISSN: 2464–4617,
Full text EndNote Citation Computer Science Research Notes

Abstract
Rate-Distortion Optimized Quantization (RDOQ) is an encoding optimization technique that may be applied to any transform-based compression technique preserving bitstream compliance with the standard. In the paper, the application of the RDOQ to Motion JPEG is described and evaluated. The proposed solution includes block-level optimization with picture-level Lagrange multiplier estimation. Performed evaluation results in higher compression ratios as compared to typical Motion JPEG.
Jakub Stankowski, Adrian Dziembowski,
Real-time CPU-based view synthesis for omnidirectional video,
30th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision : WSCG 2022, Pilsen, Czech Republic, 17-20 May 2022,
Full text EndNote Citation Computer Science Research Notes
Jakub Stankowski, Adrian Dziembowski,
Improved IV-PSNR software,
ISO/IEC JTC1/SC29/WG4 MPEG 139, M59974, July 2022,
Full text EndNote Citation
Adrian Dziembowski, Dawid Mieloch, Jakub Stankowski, Adam Grzelka,
IV-PSNR – the objective quality metric for immersive video applications,
IEEE Transactions on Circuits and Systems for Video Technology, Vol. 32, 1 June 2022, pp. 7575 - 7591, ISSN: 1558-2205,
Full text EndNote Citation DOI Code repository

Abstract
This paper presents a new objective quality metric that was adapted to the complex characteristics of immersive video (IV) which is prone to errors caused by processing and compression of multiple input views and virtual view synthesis. The proposed metric, IV-PSNR, contains two techniques that allow for the evaluation of quality loss for typical immersive video distortions: corresponding pixel shift and global component difference. The performed experiments compared the proposal with 31 state-of-the-art quality metrics, showing their performance in the assessment of quality in immersive video coding and processing, and in other applications, using commonly used image quality assessment databases – TID2013 and CVIQ. As presented, IV-PSNR outperforms other metrics in immersive video applications and still can be efficiently used in the evaluation of different images and videos. Moreover, basing the metric on the calculation of PSNR allowed the computational complexity to remain low. Publicly available, efficient implementation of IV-PSNR software was provided by the authors of this paper and is used by ISO/IEC MPEG for evaluation and research on the upcoming MPEG Immersive video (MIV) coding standard.
Jakub Stankowski, Marek Domański, Tomasz Grajek,
Fast and Energy-Efficient Watermarking of HEVC-Compressed Video Bitstreams,
30th European Signal Processing Conference EUSIPCO, Belgrade, Serbia, 29 Aug - 2 Sep 2022,
Full text EndNote Citation

Abstract
Most research results in video watermarking refer to the embedding of messages into uncompressed video, which needs full decoding and then full encoding of the content. In some applications, such a method is too complex, and watermarking of compressed bitstreams is required. Watermarking of compressed bitstreams is more difficult as the number of bits is very limited, and the compressed video is very sensitive to all modifications that may yield visible artifacts in the decoded watermarked video. In the paper, an original watermarking method is described for HEVC-compressed video. The main idea of the technique is to embed a message into nonzero residual transform coefficients in such a way that potential drift is limited. The watermark detection is based on reference, unwatermarked video. The experimental verification demonstrates the strong robustness of the embedded watermarks.

2021

Gwangsoon Lee, Jun Young Jeong, Hong Chang Shin, Kug Jin Yun, Marek Domański, Olgierd Stankiewicz, Dawid Mieloch, Adrian Dziembowski, Adam Grzelka, Jakub Stankowski,
Method and apparatus for encoding/decoding image for virtual view synthesis,
Patent office: USPTO, Status: granted,
Application number: US 16/823663, Filling date: 19.03.2020,
Publication number: US 2021/0006831, Publication date: 7.01.2021,
Patent number: US 11064218, Date of Patent: 13.07.2021,
EndNote Citation
Sławomir Różek, Marek Domański, Sławomir Maćkowiak, Olgierd Stankiewicz, Jakub Stankowski,
[VCM] New results on analysis of influence of HEVC and VVC coding on the SIFT keypoints extracted from the decoded video,
ISO/IEC JTC 1/SC 29/WG 2 MPEG 135, M57456, July 2021,
Full text EndNote Citation
Adrian Dziembowski, Jakub Stankowski, Dawid Mieloch,
On the importance of chroma in immersive video quality assessment,
ISO/IEC JTC1/SC29/AG5 MPEG 135, M57119, July 2021,
Full text EndNote Citation
Adrian Dziembowski, Dawid Mieloch, Jakub Stankowski,
Performance of full-reference objective metrics in immersive video,
ISO/IEC JTC1/SC29/AG5 MPEG 135, M57118, July 2021,
Full text EndNote Citation
Sławomir Maćkowiak, Marek Domański, Jakub Stankowski, Dominik Cywiński, Jakub Szekiełda,
[VCM] Influence of HEVC and VVC coding on the SIFT characteristic points extracted from the received video,
ISO/IEC JTC1/SC29/WG2 MPEG 134, M56678, April 2021,
Full text EndNote Citation
Marek Domański, Tomasz Grajek, Sławomir Maćkowiak, Sławomir Różek, Olgierd Stankiewicz, Jakub Stankowski,
[VCM] Requirements for stereoscopic and multiview video in VCM environment,
ISO/IEC JTC1/SC29/WG02 MPEG 133, M56105, 11-15 January 2021,
Full text EndNote Citation
Marek Domański, Tomasz Grajek, Sławomir Maćkowiak, Sławomir Różek, Olgierd Stankiewicz, Jakub Stankowski,
[VCM] Poznan University of Technology additional anchor experiment for object detection,
ISO/IEC JTC1/SC29/WG02 MPEG 133, M56099, 11-15 January 2021,
Full text EndNote Citation
Jakub Stankowski, Adrian Dziembowski,
Slightly faster IVPSNR,
ISO/IEC JTC1/SC29/WG04 MPEG 133, M55752, 11-15 January 2021,
Full text EndNote Citation

2020

Jakub Stankowski, Adrian Dziembowski,
Fast view synthesis for immersive video systems,
28th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision : WSCG 2020, Pilzno, Czech Republic, 19.05.2020,
Full text EndNote Citation DOI
Marek Domański, Tomasz Grajek, Sławomir Maćkowiak, Dawid Mieloch, Sławomir Różek, Olgierd Stankiewicz, Jakub Stankowski,
[VCM] Test material for stereoscopic and multiview video coding for machines,
MPEG131/m55108, Rennes, France, October 2020,
Full text EndNote Citation
Dawid Mieloch, Adrian Dziembowski, Jakub Stankowski, Marek Domański, Gwangsoon Lee, Jun Young Jeong,
MIV CE1.2-related: Geometry scaling,
MPEG131/m54967, Rennes, France, October 2020,
Full text EndNote Citation
Jakub Szkiełda, Jakub Stankowski, Adrian Dziembowski, Dawid Mieloch,
On the computational time of MIV-related experiments,
MPEG131/m54897, Rennes, France, October 2020,
Full text EndNote Citation
Jakub Stankowski, Olgierd Stankiewicz, Adrian Dziembowski,
Even faster implementation of IV-PSNR software,
MPEG131/m54896, Rennes, France, October 2020,
Full text EndNote Citation
Jakub Stankowski, Adrian Dziembowski,
Fast implementation of IV-PSNR software,
MPEG131/m54279, Geneva, Switzerland, June 2020,
Full text EndNote Citation
Dawid Mieloch, Adrian Dziembowski, Jakub Stankowski, Marek Domański, Gwangsoon Lee, Jun Young Jeong,
Segmentation-based geometry upsampling in TMIV,
MPEG130/m53572, Alpbach, Austria, April 2020,
Full text EndNote Citation
Adrian Dziembowski, Dawid Mieloch, Adam Grzelka, Jakub Stankowski, Marek Domański, Gwangsoon Lee, Jun Young Jeong,
CE3-related: Color-based patch splitting and sorting,
MPEG130/m53408, Alpbach, Austria, April 2020,
Full text EndNote Citation
Dawid Mieloch, Adrian Dziembowski, Jakub Stankowski, Olgierd Stankiewicz, Marek Domański, Gwangsoon Lee, Yun Young Jeong,
Immersive video depth estimation,
MPEG130/m53407, Alpbach, Austria, April 2020,
Full text EndNote Citation
Adrian Dziembowski, Dawid Mieloch, Adam Grzelka, Jakub Stankowski, Marek Domański, Gwangsoon Lee,
Immersive Video CE3-related: Spatio-temporal patch redundancy removal,
MPEG129/m51604, Brussel, Belgium, January 2020,
Full text EndNote Citation
Adrian Dziembowski, Dawid Mieloch, Adam Grzelka, Jakub Stankowski, Marek Domański, Gwangsoon Lee,
Immersive Video CE3.2: Temporal patch redundancy removal,
MPEG129/m51603, Brussel, Belgium, January 2020,
Full text EndNote Citation
Adrian Dziembowski, Dawid Mieloch, Adam Grzelka, Jakub Stankowski, Marek Domański, Gwangsoon Lee,
Immersive Video CE3.1: Patch splitting,
MPEG129/m51602, Brussel, Belgium, January 2020,
Full text EndNote Citation
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 text EndNote Citation

2019

Adam Grzelka, Adrian Dziembowski, Dawid Mieloch, Olgierd Stankiewicz, Jakub Stankowski, Marek Domański,
Impact of Video Streaming Delay on User Experience with Head-Mounted Displays,
34th Picture Coding Symposium, PCS 2019, Ningbo, China, 12-15 November 2019,
Full text EndNote Citation
Marek Domański, Adrian Dziembowski, Dawid Mieloch, Olgierd Stankiewicz, Jakub Stankowski, Adam Grzelka, Gwangsoon Lee, Jun Young Jeong, Jeongil Seo,
Call for Proposals on 3DoF+: Aggregation of the results of submission assessments obtained by the subjective tests with naïve subjects,
ISO/IEC JTC1/SC29/WG11 MPEG2019, m47985, Geneva, Switzerland, March 2019,
Full text EndNote Citation
Marek Domański, Adrian Dziembowski, Dawid Mieloch, Olgierd Stankiewicz, Jakub Stankowski, Adam Grzelka, Gwangsoon Lee, Jun Young Jeong, Jeongil Seo,
Technical description of proposal for Call for Proposals on 3DoF+ Visual prepared by Poznań University of Technology (PUT) and Electronics and Telecommunications Research Institute (ETRI),
ISO/IEC JTC1/SC29/WG11 MPEG2019, m47407, Geneva, Switzerland, March 2019,
Full text EndNote Citation
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 text EndNote Citation
Tomasz Grajek, Jakub Stankowski, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Krzysztof Wegner,
Analysis of video quality losses in the homogeneous HEVC video transcoding,
IEEE Access, Vol. 7, 12 July 2019, pp. 96764 – 96774, ISSN: 2169-3536,
EndNote Citation DOI

2018

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,
EndNote Citation DOI
Krzysztof Wegner, Jakub Stankowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Adam Grzelka, Mateusz Lorkiewicz, Hubert Żabiński, Tomasz Grajek,
MUCHA – System rejestracji i przetwarzania obrazu przestrzennego,
Twierdza, Vol. 87, No. 1, 2018, pp. 48-54, ISSN: 1507-6474,
EndNote Citation
Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Krzysztof Wegner, Olgierd Stankiewicz, Tomasz Grajek,
Kodery wizyjne - 25 lat postępu,
Twierdza, Vol. 87, No. 1, 2018, pp. 56-59, ISSN: 1507-6474,
EndNote Citation
Marek Domański, Adrian Dziembowski, Tomasz Grajek, Adam Grzelka, Dawid Mieloch, Robert Ratajczak, Jarosław Samelak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Free-viewpoint television demonstration for sports events,
ISO/IEC JTC1/SC29/WG11 MPEG2018, M41992, Gwangju, South Korea, 22-26 January 2018,
Full text EndNote Citation
Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Tomasz Grajek, Krzysztof Klimaszewski, Olgierd Stankiewicz,
Fast Modes Selection in the HEVC Intra Video Encoder Based on Statistics of Modes,
Journal of Electronic Imaging, Vol. 27, No. 4 (043051), 2018,
EndNote Citation DOI
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 text EndNote Citation DOI
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 text EndNote Citation
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 text EndNote Citation DOI

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.
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,
Full text EndNote Citation

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.
Jakub Stankowski, Adam Grzelka, Dawid Mieloch, Krzysztof Wegner,
Processing Pipeline for Real-Time Remote Delivery of Virtual View in FTV Systems,
International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
EndNote Citation

Abstract
This article presents a processing pipeline for rendering servers used in free viewpoint television systems to provide virtual views requested by the user of the free navigation service. Such functionality requires a processing scheme to ensure a fast synthesis of virtual views and to operate with very large amount of data, because FTV systems are characterized by the large number of used cameras. The proposed solutions heavily utilize parallelization and multithreaded operations, together with the use of WebSocket. The proposal was to show that the solution guarantees the delivery of the new virtual view in real time, what ensures the high quality of the experience for the user of the free navigation service.
Adrian Dziembowski, Jakub Stankowski,
Real-Time CPU-Based Virtual View Synthesis,
International Conference on Signals and Electronic Systems, ICSES 2018, Kraków, Poland, September 10-12 2018,
Full text EndNote Citation

Abstract
This paper presents the fast virtual view synthesis method for free navigation purposes. Presented method was implemented on CPU in order to allow free navigation for even cheap personal computers with integrated graphic cards. The described synthesis technique is based on the hybrid view synthesis, combining advantages of forward-type and backward-type synthesis. It allows to synthesize high resolution sequences in the real time, allowing the viewer to freely navigate around the scene, e.g. volleyball playfield. Three implementations were developed and tested: single-threaded, vectorized and multi-threaded implementation.
Adrian Dziembowski, Jakub Stankowski,
Szybka synteza widoków wirtualnych dla systemów telewizji swobodnego punktu widzenia,
Przegląd Telekomunikacyjny, Vol. 91, No. 6, 2018, pp. 330-333, ISSN: 1230-3496,
Full text EndNote Citation DOI

2017

Olgierd Stankiewicz, Krzysztof Wegner, Damian Karwowski, Jakub Stankowski, Krzysztof Klimaszewski, Tomasz Grajek,
Sterowanie koderem HEVC wykorzystujące usuwanie szumów,
Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 488-492, ISSN: 1230-3496,
Full text EndNote Citation
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,
EndNote Citation

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.
Krzysztof Wegner, Damian Karwowski, Tomasz Grajek, Krzysztof Klimaszewski, Jakub Stankowski, Olgierd Stankiewicz,
Szybkie transkodowanie strumieni HEVC poprzez eliminację skwantowanych współczynników transformaty o wartości jeden,
Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 417-420, ISSN: 1230-3496,
Full text EndNote Citation
Krzysztof Klimaszewski, Damian Karwowski, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner, Tomasz Grajek,
Przyspieszenie estymacji ruchu oraz wyboru podziału CU w koderze HEVC,
Przegląd Telekomunikacyjny, Vol. 86, No. 6, Poznań, Poland, 2017, pp. 483-487, ISSN: 1230-3496,
Full text EndNote Citation
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 text EndNote Citation
Krzysztof Wegner, Tomasz Grajek, Jakub Stankowski, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
HEVC transcoding with pruning of insignificant coefficients,
ISO/IEC JTC1/SC29/WG11 MPEG2017, M40017, Geneva, Switzerland, 16-20 January 2017,
Full text EndNote Citation
Jarosław Samelak, Jakub Stankowski, Marek Domański,
Experimental results for frame –compatible multiview video coding using HEVC SCC,
ISO/IEC JTC1/SC29/WG11 Joint Collaborative Team on Video Coding (JCT-VC), JCTVC-Z0041, Geneva, Switzerland, January 2017,
Full text EndNote Citation
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 text EndNote Citation
Jarosław Samelak, Jakub Stankowski, Marek Domański,
Efficient frame-compatible stereoscopic video coding using HEVC Screen Content Coding,
IEEE International Conference on Systems, Signals and Image Processing IWSSIP 2017, Poznań, Poland, 22-24 May 2017,
Full text EndNote Citation
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 text EndNote Citation
Marek Domański, Adrian Dziembowski, Tomasz Grajek, Adam Grzelka, Krzysztof Klimaszewski, Dawid Mieloch, Robert Ratajczak, Olgierd Stankiewicz, Jakub Siast, Jakub Stankowski, Krzysztof Wegner,
Demonstration of a simple free viewpoint television system,
IEEE International Conference on Image Processing ICIP 2017, Bejing, China, 17-20 September 2017,
Full text EndNote Citation

2016

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,
EndNote Citation

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.
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 text EndNote Citation

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.
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 text EndNote Citation

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.
Krzysztof Wegner, Tomasz Grajek, Jakub Stankowski, Damian Karwowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Marek Domański,
Pruning of insignificant coefficient in HEVC transcoding,
ISO/IEC JTC1/SC29/WG11 MPEG2016, M39528, Chengdu, China, 17-21 October 2016,
Full text EndNote Citation
Marek Domański, Adrian Dziembowski, Adam Grzelka, Łukasz Kowalski, Dawid Mieloch, Jarosław Samelak, Jakub Stankowski, Olgierd Stankiewicz, Krzysztof Wegner,
Experimental video coding software for Free Navigation applications,
ISO/IEC JTC1/SC29/WG11 MPEG2016, M39527, Chengdu, China, 17-21 October 2016,
Full text EndNote Citation
Marek Domański, Adrian Dziembowski, Adam Grzelka, Łukasz Kowalski, Dawid Mieloch, Jarosław Samelak, Jakub Stankowski, Olgierd Stankiewicz, Krzysztof Wegner,
Coding results for Poznan Fencing 2 and Poznan Blocks 2 test sequences in Free Navigation scenario,
ISO/IEC JTC1/SC29/WG11 MPEG2016, M39215, Chengdu, China, 17-21 October 2016,
Full text EndNote Citation
Marek Domański, Adrian Dziembowski, Adam Grzelka, Łukasz Kowalski, Dawid Mieloch, Jarosław Samelak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Extended results of Poznan University of Technology proposal for Call for Evidence on Free-Viewpoint Television,
ISO/IEC JTC1/SC29/WG11 MPEG2016, M38246, Geneva, Switzerland, 30 May - 03 June 2016,
Full text EndNote Citation
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 text EndNote Citation

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.
Marek Domański, Jarosław Samelak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
[FTV AHG] 3D-HEVC extensions for free navigation,
ISO/IEC JTC1/SC29/WG11 MPEG2016, M38101, San Diego, US, 22-26 February 2016,
Full text EndNote Citation
Marek Domański, Adrian Dziembowski, Adam Grzelka, Łukasz Kowalski, Dawid Mieloch, Jarosław Samelak, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Technical Description of Poznan University of Technology proposal for Call for Evidence on Free-Viewpoint Television,
ISO/IEC JTC1/SC29/WG11 MPEG2016, M37893, San Diego, US, 22-26 February 2016,
Full text EndNote Citation
Adrian Dziembowski, Marek Domański, Adam Grzelka, Dawid Mieloch, Jakub Stankowski, Krzysztof Wegner,
The influence of a lossy compression on the quality of estimated depth maps,
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 text EndNote Citation DOI

Abstract
The paper considers the influence of a lossy compression of multiview video on the quality of estimated depth maps. We have encoded a set of views with commonly known compression techniques used in compact IP cameras: HEVC (MPEG H part 2 / H.265), AVC (MPEG 4 part 10 / H.264) and MPEG 2 part 2 / H.262. Basing on the decoded data we have estimated depth maps and rendered a set of the intermediate virtual views. A drop of the quality was studied by comparison of virtual views rendered out of the depth maps estimated from an uncompressed video. The obtained results show that with a reasonable compression rate, lower quality of virtual views is acceptable for real implementable FTV systems.
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 text EndNote Citation DOI

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.
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 text EndNote Citation DOI

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.
Jakub Siast, Jakub Stankowski, Marek Domański,
Hierarchical fast selection of intraframe prediction mode in HEVC,
International Journal of Electronics and Telecommunications, Vol. 62, No. 2, Electronics and Telecommunications Committee of Polish Academy of Sciences, Warsaw, 2016, pp. 147-151, ISSN: 2300-1933,
Full text EndNote Citation DOI

Abstract
In the new HEVC standard, there are 35 intraframe prediction modes. Therefore, real-time implementations need fast mode pre-selection to reduce the computational load of cost comparison for individual modes. In this paper, a simple technique is proposed to reduce the complexity of the Unified Intra Prediction by decreasing the mode candidate number evaluated in the Rough Mode Decision step. We call this approach hierarchical as we decrease stepwise the angles between the directions of the prediction modes that are tested. Obviously, the fast mode selection results in significant complexity reduction obtained at the cost of choosing a sub-optimum mode related to slightly reduced compression performance. In the paper, it is proposed how to calculate the trade-off between encoder complexity and compression performance, using the ratio of relative coding time reduction and average bitrate increase estimated for constant decoded video quality. Extensive experiments prove that this ratio is much higher for the proposed technique than for many other techniques from the references.
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 text EndNote Citation DOI

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.
Jarosław Samelak, Jakub Stankowski, Marek Domański,
Adaptation of the 3D-HEVC coding tools to arbitrary locations of cameras,
International Conference on Signals and Electronic Systems, ICSES 2016, Kraków, Poland, September 5-7 2016,
Full text EndNote Citation

Abstract
In the paper, we describe the extensions of the 3D HEVC compression technology aimed at improved compression efficiency for multi-view sequences acquired from arbitrarily located cameras. Our proposal refines the inter-view prediction by replacing the horizontal shifts with the true mapping in the 3D space. This implies changes in several coding tools, which we describe in details. The paper also reports experimental results on the comparison of the proposed solution to the 3D-HEVC standard codec. We also discuss the influence of the number of views and the view coding order on the compression efficiency.

2015

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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation
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,
EndNote Citation

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.
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 text EndNote Citation DOI

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.
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 text EndNote Citation

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.
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 text EndNote Citation DOI

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.
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 text EndNote Citation DOI

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.
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 text EndNote Citation DOI

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.
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 text EndNote Citation DOI

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.
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 text EndNote Citation

2014

Krzysztof Wegner, Tomasz Grajek, Jakub Stankowski, Luis Lucas,
Badania nad technikami przetwarzania obrazu trójwymiarowego realizowane w europejskim programie współpracy naukowo-technicznej,
Przegląd Telekomunikacyjny, No. 8-9, August/September 2014, pp. 1321-1326,
Full text EndNote Citation
Jarosław Samelak, Cezary Korzeniewski, Łukasz Kowalski, Jakub Stankowski,
Zoptymalizowana implementacja dekodera HEVC,
Przegląd Telekomunikacyjny, No. 6/2014, Warszawa, Polska, June 2014, pp. 583-586,
Full text EndNote Citation
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 text EndNote Citation

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.
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 text EndNote Citation DOI

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.
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 text EndNote Citation

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

Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Poznański kodek obrazów trójwymiarowych,
Przegląd Telekomunikacyjny, No. 2-3, February/March 2013, pp. 81-83,
EndNote Citation
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 text EndNote Citation DOI

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.
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 text EndNote Citation
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 text EndNote Citation DOI

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.

2012

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,
EndNote Citation

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.
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 text EndNote Citation DOI

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.
Marek Domański, Tomasz Grajek, Damian Karwowski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Coding of multiple video+depth using HEVC technology and reduced representations of side views and depth maps,
29th Picture Coding Symposium, PCS 2012, Kraków, Poland, 7-9 May 2012, pp. 5-8,
Full text EndNote Citation DOI
Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
New coding technology for 3D video with depth maps as proposed for standardization within MPEG,
19th International Conference on Systems, Signals and Image Processing, IWSSIP 2012, Vienna, Austria, 11-13 April 2012, pp. 401-404, ISBN: 978-1-4577-2191-5 ,
Full text EndNote Citation
Jakub Stankowski, Marek Domański, Olgierd Stankiewicz, Jacek Konieczny, Jakub Siast, Krzysztof Wegner,
Extensions of the HEVC Technology for Efficient Multiview Video Coding,
19th IEEE International Conference on Image Processing (ICIP 2012), Orlando, Florida, U.S.A., 30 September - 3 October 2012, pp. 1317-1320, ISSN: 1522-4880,
Full text EndNote Citation DOI
Marek Domański, Jacek Konieczny, Maciej Kurc, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
3D video compression by coding of disoccluded regions,
19th IEEE International Conference on Image Processing (ICIP 2012), Orlando, Florida, U.S.A., 30 September - 3 October 2012, pp. 1317-1320,
Full text EndNote Citation DOI

2011

Marek Domański, Tomasz Grajek, Damian Karwowski, Krzysztof Klimaszewski, Jacek Konieczny, Maciej Kurc, Adam Łuczak, Robert Ratajczak, Jakub Siast, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Technical Desciption of Poznan University of Technology proposal for Call on 3D Video Coding Technology,
ISO/IEC JTC1/SC29/WG11, MPEG 2011 / M22697, Geneva, Switzerland, 28 November-02 December 2011,
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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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2010

Jakub Stankowski, Krzysztof Klimaszewski, Olgierd Stankiewicz, Krzysztof Wegner, Marek Domański,
Preprocessing methods used for Poznan 3D/FTV test sequences,
ISO/IEC JTC1/SC29/WG11 MPEG 2010/M17174, m17174, Kyoto, Japan, January 2010,
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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,
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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.
Krzysztof Wegner, Krzysztof Klimaszewski, Olgierd Stankiewicz, Jakub Stankowski, Marek Domański,
Przygotowanie wielowidokowych sekwencji wizyjnych dla badań nad telewizją trójwymiarową,
Krajowa Konferencja Radiokomunikacji, Radiofonii i Telewizji KKRRiT 2010, Kraków, Polska, 16-19 June 2010,
EndNote Citation
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,
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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

Marek Domański, Tomasz Grajek, Krzysztof Klimaszewski, Maciej Kurc, Olgierd Stankiewicz, Jakub Stankowski, Krzysztof Wegner,
Poznań Multiview Video Test Sequences and Camera Parameters,
ISO/IEC JTC1/SC29/WG11, MPEG/M17050, m17050, Xian, China, 26-30 October 2009,
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Jakub Stankowski

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