State-of-the-Art and Trends in Scalable Video Compression with Wavelet Based Approaches

3noScalable Video Coding (SVC) differs form traditional single point approaches mainly because it allows to encode in a unique bit stream several working points corresponding to different quality, picture size and frame rate. This work describes the current state-of-the-art in SVC, focusing on wavelet based motion-compensated approaches (WSVC). It reviews individual components that have been designed to address the problem over the years and how such components are typically combined to achieve meaningful WSVC architectures. Coding schemes which mainly differ from the space-time order in which the wavelet transforms operate are here compared, discussing strengths and weaknesses of the resulting implementations. An evaluation of the achievable coding performances is provided considering the reference architectures studied and developed by ISO/MPEG in its exploration on WSVC. The paper also attempts to draw a list of major differences between wavelet based solutions and the SVC standard jointly targeted by ITU and ISO/MPEG. A major emphasis is devoted to a promising WSVC solution, named STP-tool, which presents architectural similarities with respect to the SVC standard. The paper ends drawing some evolution trends for WSVC systems and giving insights on video coding applications which could benefit by a wavelet based approach.partially_openpartially_openADAMI N; SIGNORONI. A; R. LEONARDIAdami, Nicola; Signoroni, Alberto; Leonardi, Riccard

MASCOT : metadata for advanced scalable video coding tools : final report

The goal of the MASCOT project was to develop new video coding schemes and tools that provide both an increased coding efficiency as well as extended scalability features compared to technology that was available at the beginning of the project. Towards that goal the following tools would be used: - metadata-based coding tools; - new spatiotemporal decompositions; - new prediction schemes. Although the initial goal was to develop one single codec architecture that was able to combine all new coding tools that were foreseen when the project was formulated, it became clear that this would limit the selection of the new tools. Therefore the consortium decided to develop two codec frameworks within the project, a standard hybrid DCT-based codec and a 3D wavelet-based codec, which together are able to accommodate all tools developed during the course of the project

Measurements, Models, Systems and Design

531 s.

High Performance Multiview Video Coding

Following the standardization of the latest video coding standard High Efficiency Video Coding in 2013, in 2014, multiview extension of HEVC (MV-HEVC) was published and brought significantly better compression performance of around 50% for multiview and 3D videos compared to multiple independent single-view HEVC coding. However, the extremely high computational complexity of MV-HEVC demands significant optimization of the encoder. To tackle this problem, this work investigates the possibilities of using modern parallel computing platforms and tools such as single-instruction-multiple-data (SIMD) instructions, multi-core CPU, massively parallel GPU, and computer cluster to significantly enhance the MVC encoder performance. The aforementioned computing tools have very different computing characteristics and misuse of the tools may result in poor performance improvement and sometimes even reduction. To achieve the best possible encoding performance from modern computing tools, different levels of parallelism inside a typical MVC encoder are identified and analyzed. Novel optimization techniques at various levels of abstraction are proposed, non-aggregation massively parallel motion estimation (ME) and disparity estimation (DE) in prediction unit (PU), fractional and bi-directional ME/DE acceleration through SIMD, quantization parameter (QP)-based early termination for coding tree unit (CTU), optimized resource-scheduled wave-front parallel processing for CTU, and workload balanced, cluster-based multiple-view parallel are proposed. The result shows proposed parallel optimization techniques, with insignificant loss to coding efficiency, significantly improves the execution time performance. This , in turn, proves modern parallel computing platforms, with appropriate platform-specific algorithm design, are valuable tools for improving the performance of computationally intensive applications

Holography

Holography - Basic Principles and Contemporary Applications is a collection of fifteen chapters, describing the basic principles of holography and some recent innovative developments in the field. The book is divided into three sections. The first, Understanding Holography, presents the principles of hologram recording illustrated with practical examples. A comprehensive review of diffraction in volume gratings and holograms is also presented. The second section, Contemporary Holographic Applications, is concerned with advanced applications of holography including sensors, holographic gratings, white-light viewable holographic stereograms. The third section of the book Digital Holography is devoted to digital hologram coding and digital holographic microscopy

The Prospects of Institutional Transfer: A Within-Case Study of NATO Advisor Influence Across the Afghan Security Ministries and National Security Forces, 2009-2012

This dissertation is an in-depth case study of NATO advisors and their perceived influence in Afghanistan (2009-2012). It explores the two-part question, how do foreign security actors (ministerial advisors and security force trainers, advisors, and commanders) attempt to influence their host-nation partners and what are their perceptions of these approaches on changes in local capacity, values, and security governance norms? I argue that security sector reform (SSR) programs in fragile states lack an explicit theory of change that specifies how reform occurs. From this view, I theorize internationally led SSR as guided institutional transfer, grounded in rationalist and social constructivist explanations of convergence, diffusion, and socialization processes. Responding to calls for greater depth and emphasis on interactions and institutional change in SSR research, I examine NATO\u27s efforts in Afghanistan as an extreme case of SSR in which external-internal interactions were the highest. A stratified, purposive sample of 68 military and civilian elites (24 ministerial advisors, 27 embedded field advisors and commanders, and 17 experts and external observers) participated in a confidential, semi-structured interview. Content analysis of interviews and supporting documentation reveal that participants perceived modest impact on capacity development in both the Afghan security ministries and security forces; however, they perceived limited normative impact on both organizational and individual levels. Second, participants who used heavy-handed or transactional approaches rarely saw positive or enduring outcomes with their counterparts. Third, legitimacy-based approaches that elicited partner engagement were perceived as more effective than power-based approaches (e.g., demands, incentives), though the techniques participants favored (e.g., persuasion, guided discovery learning) varied by level and context. Fourth, in addition to Afghan political and cultural constraints, NATO\u27s campaign strategy, accelerated timeline, and high resource inflow created perverse incentives for some advisors and leaders to pressure or induce their counterparts in the spirit of progress. Finally, advisors with the unique ability to develop close relationships were more likely to promote capacity transfer and, elicit curiosity and dialogue on security governance norms (e.g., civilian control, ethical leadership)

Proceedings of the GPEA Polytechnic Summit 2022: Session Papers

Welcome to GPEA PS 2022 Each year the Polytechnic Summit assembles leaders, influencers and contributors who shape the future of polytechnic education. The Polytechnic Summit provides a forum to enable opportunities for collaboration and partnerships and for participants to focus on innovation in curriculum and pedagogy, to share best practices in active and applied learning, and discuss practice-based research to enhance student learning. This year a view on the aspects of applied research will be added. How to conduct research in a teaching first environment and make use of this. Which characteristics of applied research are important to be used in teaching and vice versa?The Summit will – once again - also provide an opportunity to examine the challenges and opportunities presented by COVID-19 and will offer us all an opportunity to explore the ways in which we can collaborate more effectively using our new-found virtual engagement skills and prepare for a hybrid future. PS2022 Themes: Design (Programmes, Curriculum, Organisation);Practice-Based Learning;Applied Research; Employability and Graduate Skills; Internationalisation, Global Teaching & Collaboration and Sustainability Theme