• Adaptive Tile Parallelization for Fast Video Encoding in HEVC 

      Koziri M., Papadopoulos P.K., Tziritas N., Dadaliaris A.N., Loukopoulos T., Khan S.U., Xu C.-Z. (2017)
      As large multimedia providers rely more and more on Cloud resources to perform video coding and transcoding, designing fast and efficient coders that take advantage of parallelization, particularly for the new video standard ...
    • Binocular-Combination-Oriented Perceptual Rate-Distortion Optimization for Stereoscopic Video Coding 

      Liu Y., Liu J., Argyriou A., Ci S. (2018)
      In the chain of stereoscopic video processing, stereoscopic video coding and viewing are usually two independent stages. Conventional stereoscopic video coding puts an emphasis on improving the coding efficiency by seeking ...
    • Coding Time Prediction in H.264/HEVC Transcoding Using Macroblock Sizes 

      Papadopoulos P.K., Panagou N., Koziri M., Kolomvatsos K., Loukopoulos T., Anagnostopoulos I. (2019)
      The continuous customers' demand for higher resolution video led to the development of video coding standards that surpass the limitations of H.264/AVC. Prominent examples in this category include the High Efficiency Video ...
    • Combining tile parallelism with slice partitioning in video coding 

      Koziri M., Papadopoulos P.K., Loukopoulos T. (2018)
      Tiles and slices provide different frame partitioning options. While they can both be used for video coding parallelization, tiles offer better scalability to the number of available processors, especially as far as video ...
    • Cross-layer optimized authentication and error control for wireless 3D medical video streaming over LTE 

      Liu Y., Liu J., Argyriou A., Ci S. (2017)
      3D video for tele-medicine applications is gradually gaining momentum since the 3D technology can provide precise location information. However, the weak link for 3D video streaming is the necessary wireless link of the ...
    • Efficient Cloud Provisioning for Video Transcoding: Review, Open Challenges and Future Opportunities 

      Koziri M.G., Papadopoulos P.K., Tziritas N., Loukopoulos T., Khan S.U., Zomaya A.Y. (2018)
      Video transcoding is the process of encoding an initial video sequence into multiple sequences of different bitrates, resolutions, and video standards, so that it can be viewed on devices of various capabilities and with ...
    • Efficient high-performance ASIC implementation of JPEG-LS encoder 

      Papadonikolakis, M.; Pantazis, V.; Kakarountas, A. P. (2007)
      This paper introduces an innovative design which implements a high-performance JPEG-LS encoder. The encoding process follows the principles of the JPEG-LS lossless mode. The proposed implementation consists of an efficient ...
    • Evaluation of heterogeneous scheduling algorithms for wavefront and tile parallelism in video coding 

      Panagou N., Koziri M., Papadopoulos P.K., Oikonomou P., Tziritas N., Kolomvatsos K., Loukopoulos T., Khan S.U. (2019)
      Video is by far the “biggest” Big Data, stretching network and storage capacity to their limits. To handle the situation, video compression has been an active field of study for many years, producing output of huge commercial ...
    • A Fast Heuristic for Tile Partitioning and Processor Assignment in Hevc 

      Papadopoulos P.K., Koziri M., Loukopoulos T. (2018)
      As the compression efficiency of HEVC comes at the cost of high complexity, especially in the encoder's side, improved parallelization techniques that will speedup the encoding process are essential. One of the parallelization ...
    • Fast Rules to Speedup HEVC to VVC Transcoding 

      Panagou N., Belememis P., Papadopoulos P.K., Koziri M., Loukopoulos T. (2021)
      With the advent of the newly introduced Versatile Video Coding Standard (VVC) the need for converting legacy content from its widely used predecessor, High Efficiency Video Coding (HEVC), to the new format has emerged due ...
    • A framework for joint network coding and transmission rate control in wireless networks 

      Kim, T. S.; Vural, S.; Broustis, I.; Syrivelis, D.; Krishnamurthy, S. V.; La Porta, T. F. (2010)
      Network coding has been proposed as a technique that can potentially increase the transport capacity of a wireless network via processing and mixing of data packets at intermediate routers. However, most previous studies ...
    • Heuristics for tile parallelism in HEVC 

      Koziri M., Papadopoulos P.K., Tziritas N., Giachoudis N., Loukopoulos T., Khan S.U., Stamoulis G.I. (2017)
      HEVC has emerged as the new video coding standard promising increased compression ratios compared to its predecessors. This performance improvement comes at a high computational cost. For this reason, HEVC offers three ...
    • HEVC decoder optimization in low power configurable architecture for wireless devices 

      Magoulianitis V., Katsavounidis I. (2015)
      High Efficiency Video Coding (HEVC) is the new video compression standard, reducing bitrates nearly at half compared to H.264, offering potentially significant power savings for wireless video transmission at the network ...
    • Interactive installations and the conception of space - An introduction 

      Papaconstantinou, G. A. (2006)
      Today we are living in the midst of an emerging new iconographic paradigm, that of the digital image. On one hand all information media and cultural objects can be transferred and encoded in digital form while on the other ...
    • Joint quantizer optimization for scalable coding 

      Koziri, M.; Eleftheriadis, A. (2010)
      Scalability is an attractive solution to the problems posed by modern multimedia transmission systems. The key for better performance in scalable coding is joint rate distortion optimization. We present a new stochastic ...
    • A low-power VLSI architecture for intra and inter prediction in H.264 

      Koziri, M. G.; Stamoulis, G. I.; Katsvounidis, I. X. (2006)
      The H.264 video coding standard can achieve considerably higher coding efficiency than previous standards. The keys to this high code efficiency are mainly the two prediction modes (Intra & Inter) provided by the standard. ...
    • Mobile healthcare information management utilizing Cloud Computing and Android OS 

      Doukas, C.; Pliakas, T.; Maglogiannis, I. (2010)
      Cloud Computing provides functionality for managing information data in a distributed, ubiquitous and pervasive manner supporting several platforms, systems and applications. This work presents the implementation of a ...
    • On evaluating the impact of tile partitioning in AV1 

      Panagou N., Papadopoulos P.K., Koziri M., Loukopoulos T. (2018)
      The advent of 4K and 8K resolutions in cameras and TV sets, posed a challenge to Video on Demand (VoD) and live streaming industry since the network overhead compared to FullHD was multiplied. For this reason, new video ...
    • On improving the speedup of slice and tile level parallelism in HEVC Using AVX2 

      Skoumpourdis D., Papadopoulos P.K., Koziri M.G., Tziritas N., Loukopoulos T., Anagnostopoulos I. (2017)
      HEVC has emerged as the new video coding standard promising improved compression ratios (for the same quality) by up to 50% compared to H.264/AVC. To achieve this performance HEVC requires increased computational overhead ...
    • On planning the adoption of new video standards in social media networks: a general framework and its application to HEVC 

      Koziri M., Papadopoulos P.K., Tziritas N., Dadaliaris A.N., Loukopoulos T., Stamoulis G.I. (2017)
      In recent years, we have witnessed an explosion in the growth of social media networks, powered by the proliferation of handheld smart devices with high processing capabilities and a plethora of sensors including high-resolution ...