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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of Compressed Data Stream Content in HEVC Video Encoder
    Autorzy:
    Stankowski, J.
    Karwowski, D.
    Grajek, T.
    Wegner, K.
    Siast, J.
    Klimaszewski, K.
    Stankiewicz, O.
    Domański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227246.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HEVC
    video compression
    compressed data stream analysis
    Opis:
    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.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 2; 121-127
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Key-point Detection based Fast CU Decision for HEVC Intra Encoding
    Autorzy:
    Xu, Z.
    Min, B.
    Cheung, R. C. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/226128.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HEVC
    video coding
    fast CU decision
    corner detection
    Opis:
    As the most recent video coding standard, High Efficiency Video Coding (HEVC) adopts various novel techniques, including a quad-tree based coding unit (CU) structure and additional angular modes used for intra encoding. These new techniques achieve a notable improvement in coding efficiency at the penalty of significant computational complexity increase. Thus, a fast HEVC coding algorithm is highly desirable. In this paper, we propose a fast intra CU decision algorithm for HEVC to reduce the coding complexity, mainly based on a key-point detection. A CU block is considered to have multiple gradients and is early split if corner points are detected inside the block. On the other hand, a CU block without corner points is treated to be terminated when its RD cost is also small according to statistics of the previous frames. The proposed fast algorithm achieves over 62% encoding time reduction with 3.66%, 2.82%, and 2.53% BD-Rate loss for Y, U, and V components, averagely. The experimental results show that the proposed method is efficient to fast decide CU size in HEVC intra coding, even though only static parameters are applied to all test sequences.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 3; 321-327
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HEVC Encoding Assisted with Noise Reduction
    Autorzy:
    Stankiewicz, O.
    Wegner, K.
    Karwowski, D.
    Stankowski, J.
    Klimaszewski, K.
    Grajek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226110.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HEVC encoding
    encoder control
    model selection optimization
    noise reduction
    Opis:
    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.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 3; 285-292
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increased Compression Efficiency of AVC and HEVC CABAC by Precise Statistics Estimation
    Autorzy:
    Karwowski, D.
    Domański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226764.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    entropy coding
    CABAC algorithm
    CTW technique
    Video Compression
    AVC
    HEVC
    Opis:
    The paper presents Improved Adaptive Arithmetic Coding algorithm for application in future video compression technology. The proposed solution is based on the Context-based Adaptive Binary Arithmetic Coding (CABAC) technique and uses the authors mechanism of symbols probability estimation that exploits Context-Tree Weighting (CTW) technique. This paper proposes the version of the algorithm, that allows an arbitrary selection of depth D of context trees, when activating the algorithm in the framework of the AVC or HEVC video encoders. The algorithm has been tested in terms of coding efficiency of data and its computational complexity. Results showed, that depending on depth of context trees from 0.1% to 0.86% reduction of bitrate is achieved, when using the algorithm in the HEVC video encoder and 0.4% to 2.3% compression gain in the case of the AVC. The new solution increases complexity of entropy encoder itself, however, this does not cause an increase of the complexity of the whole video encoder.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 3; 277-284
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hierarchical Fast Selection of Intraframe Prediction Mode in HEVC
    Autorzy:
    Siast, J.
    Stankowski, J.
    Domański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226081.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    video coding
    high efficiency video coding (HEVC)
    intraframe prediction
    fast mode selection
    Opis:
    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.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 2; 147-151
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of No-Reference Video Quality Metrics for HEVC Compression
    Autorzy:
    Rouis, K.
    Leszczuk, M.
    Janowski, M.
    Papir, Z.
    Tahar, J. B. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/307568.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    High Efficiency Video Coding (HEVC)
    No-Reference metrics
    Quality of Experience (QoE)
    Video Quality Assessment
    Opis:
    The paper proposes a No-Reference (NR) quality assessment measurement originally developed for H.264, used for High Efficiency Video Coding (HEVC). In particular, authors present an investigation of NR metrics to objectively estimate the perceptual quality of a set of processed video sequences. The authors take into account typical distortions introduced by the block-based coding approaches like HEVC codec. The underlying processing used for the quality assessment considers the blockiness caused by the boundaries of each coded block and the blurring as a lack of spatial details. The correlation between the NR quality metrics and the well-known and most widely used objective metric, the Video Quality Model (VQM), is performed to validate the quality prediction accuracy based on the provided scores. The Pearson correlation coefficients obtained stand for promising results for different types of videos.
    Źródło:
    Journal of Telecommunications and Information Technology; 2016, 1; 22-28
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Parameterized Model for Determining Quality of Online Video Service Using Modern H.265/HEVC and VP9 Codecs
    Autorzy:
    Uhl, Tadeus
    Hoppe, Christian
    Powiązania:
    https://bibliotekanauki.pl/articles/1839313.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    H.265/HEVC
    IP network
    ITU-T
    J.341
    native RTP
    QoS measurement techniques
    video services
    VP9
    Opis:
    This paper describes a new measurement method (VS model) for determining the quality of online video services relying on modern H.265/HEVC and VP9 codecs. The said method has been developed on the basis of VQuad-HD curves (according to ITU-T J.341). This model does not refer to signal analysis, but protocol analysis instead. The parameters used are: type of video codec, encoding rate, transport technique, packet loss and burst size. The method may be implemented quickly and easily, which is one of the great advantages when using this method to measure QoS.
    Źródło:
    Journal of Telecommunications and Information Technology; 2020, 4; 72-78
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A system for evaluating performance of video codecs in image compression
    System do badania skuteczności kodeków wideo w kodowaniu obrazu
    Autorzy:
    Parfieniuk, M.
    Szpakowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/88436.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    wideo
    obraz
    kodowanie
    kompresja
    kodek
    HEVC
    H.264
    dekompozycja składowa polifazowa
    video
    image
    coding
    compression
    codec
    MPEG4 AVC
    polyphase
    decomposition
    Opis:
    This article presents a system for evaluating how well do video codecs perform in still image compression. As it is time consuming and tedious to directly configure and run the reference H.265 (HEVC) and H.264 (MPEG4 AVC) codecs, our tool makes experimenting easier and more efficient. The system provides a graphical user interface for conveniently and quickly preparing input files, for repeatedly running video codecs, and for analysing output data. In the background, there are algorithms for forming video sequences and configuration files, for batch executing an encoder, and for extracting information from output files. Our research was mainly aimed at speeding-up experiments related to compressing an image represented as a video sequence composed of its polyphase components. The system has allowed us to experimentally verify that, like its predecessor, the H.264, the HEVC standard needs modified entropy codes for effectively processing decimated images.
    Artykuł prezentuje system do badania sprawności kodeków wideo w kompresowaniu obrazu. Ponieważ bezpośrednie konfigurowanie i uruchamianie referencyjnych kodeków H.265 (HEVC) i H.264 (MPEG4 AVC) jest pracą czasochłonną i żmudną, omawiane narzędzie pozwala przeprowadzać eksperymenty łatwiej i szybciej. System jest wyposażony w graficzny interfejs użytkownika do wygodnego i sprawnego przygotowywania ˙ plików wejściowych, do wielokrotnego uruchamiania kodeków wideo i do analizowania danych wyjściowych. Interfejs opiera się na podprogramach do formowania sekwencji wideo i plików konfiguracyjnych, do wsadowego uruchamiania koderów i do wydobywania informacji z plików wynikowych. Głównym celem pracy nad systemem było przyspieszenie eksperymentów nad kodowaniem obrazu reprezentowanego jako sekwencja wideo złożona z jego składowych polifazowych. System umożliwił eksperymentalne sprawdzenie, że podobnie jak H.264, standard HEVC może skutecznie przetwarzać obrazy zdecymowane, ale wymaga to zoptymalizowania kodów entropijnych.
    Źródło:
    Advances in Computer Science Research; 2016, 13; 59-73
    2300-715X
    Pojawia się w:
    Advances in Computer Science Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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