Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
Wireless Multimedia Sensor Networks (WMSNs), is a network of sensors, which are limited in terms\nof memory, computing, bandwidth, and battery lifetime. Multimedia transmission over WSN requires\ncertain QoS guarantees such as huge amount of bandwidth, strict delay and lower loss ratio\nthat makes transmitting multimedia is a complicated task. However, adopting cross-layer approach\nin WMSNs improves quality of service of WSN under different environmental conditions. In this\nwork, an energy efficient and QoS aware framework for transmitting multimedia content over\nWSN (EQWSN) is presented, where packet, queue and path scheduling were introduced. It adapts\nthe application layer parameter of video encoder to current wireless channel state, and drops less\nimportant packets in case of network congestion according to packet type. Finally, the path scheduling\ndifferentiates packets types/priority and route them through different paths with different\nQoS considering network lifetime. Simulation results show that the new scheme EQWSN transmits\nvideo quality with QoS guarantees in addition to prolonging network lifetime....
To improve rate-distortion (R-D) performance, high efficiency video coding (HEVC) increases the intraprediction modes with\nheavy computational load, and thus the intracoding optimization is highly demanded for real-time applications. According to the\nconditional probabilities of most probable modes and the correlation of potential candidate subsets, this paper proposes a fast\nHEVC intramode decision scheme based on the hybrid cost ranking which includes both Hadamard cost and rate-distortion cost.\nThe proposed scheme utilizes the coded results of the modified rough mode decision and the neighboring prediction units so as to\nobtain a potential candidate subset and then conditionally selects the optimal mode through early likelihood decision and hybrid\ncost ranking. By the experiment-driven methodology, the proposed scheme implements the early termination if the best mode from\nthe candidate subset is equal to one or two neighboring intramodes.The experimental results demonstrate that the proposed scheme\naveragely provides about 23.7% encoding speedup with just 0.82% BD-rate loss in comparison with default fast intramode decision\nin HM16.0. Compared to other fast intramode decision schemes, the proposed scheme also significantly reduces intracoding time\nwhile maintaining similar R-D performance for the all-intraconfiguration in HM16.0 Main profile...
Eye tracking methodology is used to examine the influence of interactive multimedia on the allocation of\nvisual attention and its dynamics during learning. We hypothesized that an interactive simulation promotes\nmore organized switching of attention between different elements of multimedia learning material, e.g.,\ntextual description and pictorial visualization. Participants studied a description of an algorithm accompanied\neither by an interactive simulation, self-paced animation, or static illustration. Using a novel framework for\nentropy-based comparison of gaze transition matrices, results showed that the interactive simulation elicited\nmore careful visual investigation of the learning material as well as reading of the problem description\nthrough to its completion....
The aim of this paper is focused on the problem of improving movement notion and increasing the efficiency of motor learning in skiing using multimedia tools. The text approaches the system providing a targeted feedback in the process of the acquisition of skiing skills. The platform influencing the movement notion introduces innovative means of the acquisition of essential skiing skills in ski courses organized by the Department of PE and Sport of the Faculty of Education, University of Hradec Kr�¡lov�©. The paper presents the selected results of the survey realized by an enquiring method, which was aimed to find out opinions on a monitored platform among students specializing in physical education and sport, who took part in this form of education. The research results indicate that the use of multimedia tools in providing visual feedback can effectively influence the process and the final effect of the acquisition of skiing skills. Positive opinions of the overwhelming majority of respondents illustrate that the use of video analysis in combination with verbal mistake correction is an effective support in skiing practice and it is an efficient platform that accelerates results in learning skiing technique, especially in the context of educational courses. Conclusions also point to some of the negative aspects related to the use of multimedia tools within the platform....
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