337,016 research outputs found
Fusion-Based Versatile Video Coding Intra Prediction Algorithm with Template Matching and Linear Prediction
The new generation video coding standard Versatile Video Coding (VVC) has adopted many novel technologies to improve compression performance, and consequently, remarkable results have been achieved. In practical applications, less data, in terms of bitrate, would reduce the burden of the sensors and improve their performance. Hence, to further enhance the intra compression performance of VVC, we propose a fusion-based intra prediction algorithm in this paper. Specifically, to better predict areas with similar texture information, we propose a fusion-based adaptive template matching method, which directly takes the error between reference and objective templates into account. Furthermore, to better utilize the correlation between reference pixels and the pixels to be predicted, we propose a fusion-based linear prediction method, which can compensate for the deficiency of single linear prediction. We implemented our algorithm on top of the VVC Test Model (VTM) 9.1. When compared with the VVC, our proposed fusion-based algorithm saves a bitrate of 0.89%, 0.84%, and 0.90% on average for the Y, Cb, and Cr components, respectively. In addition, when compared with some other existing works, our algorithm showed superior performance in bitrate savings
Development and Evaluation of a Low-Drift Inertial Sensor-Based System for Analysis of Alpine Skiing Performance
This research has been funded by Junta de AndalucĂa (Spain) under project B-TIC-468-
UGR18. The project was partially supported by European Regional Development Funds (ERDF).In skiing it is important to know how the skier accelerates and inclines the skis during the turn to avoid injuries and improve technique. The purpose of this pilot study with three participants was to develop and evaluate a compact, wireless, and low-cost system for detecting the inclination and acceleration of skis in the field based on inertial measurement units (IMU). To that end, a commercial IMU board was placed on each ski behind the skier boot. With the use of an attitude and heading reference system algorithm included in the sensor board, the orientation and attitude data of the skis were obtained (roll, pitch, and yaw) by IMU sensor data fusion. Results demonstrate that the proposed IMU-based system can provide reliable low-drifted data up to 11 min of continuous usage in the worst case. Inertial angle data from the IMU-based system were compared with the data collected by a video-based 3D-kinematic reference system to evaluate its operation in terms of data correlation and system performance. Correlation coefficients between 0.889 (roll) and 0.991 (yaw) were obtained. Mean biases from -1.13 degrees (roll) to 0.44 degrees (yaw) and 95% limits of agreements from 2.87 degrees (yaw) to 6.27 degrees (roll) were calculated for the 1-min trials. Although low mean biases were achieved, some limitations arose in the system precision for pitch and roll estimations that could be due to the low sampling rate allowed by the sensor data fusion algorithm and the initial zeroing of the gyroscope.Junta de Andalucia
European Commission
B-TIC-468UGR18European Commissio
Target-adaptive CNN-based pansharpening
We recently proposed a convolutional neural network (CNN) for remote sensing
image pansharpening obtaining a significant performance gain over the state of
the art. In this paper, we explore a number of architectural and training
variations to this baseline, achieving further performance gains with a
lightweight network which trains very fast. Leveraging on this latter property,
we propose a target-adaptive usage modality which ensures a very good
performance also in the presence of a mismatch w.r.t. the training set, and
even across different sensors. The proposed method, published online as an
off-the-shelf software tool, allows users to perform fast and high-quality
CNN-based pansharpening of their own target images on general-purpose hardware
Applications of Skyrme energy-density functional to fusion reactions spanning the fusion barriers
The Skyrme energy density functional has been applied to the study of
heavy-ion fusion reactions. The barriers for fusion reactions are calculated by
the Skyrme energy density functional with proton and neutron density
distributions determined by using restricted density variational (RDV) method
within the same energy density functional together with semi-classical approach
known as the extended semi-classical Thomas-Fermi method. Based on the fusion
barrier obtained, we propose a parametrization of the empirical barrier
distribution to take into account the multi-dimensional character of real
barrier and then apply it to calculate the fusion excitation functions in terms
of barrier penetration concept. A large number of measured fusion excitation
functions spanning the fusion barriers can be reproduced well. The competition
between suppression and enhancement effects on sub-barrier fusion caused by
neutron-shell-closure and excess neutron effects is studied.Comment: 28 pages, 13 figures and 2 tables. accepted by Nucl. Phys.
Electrical Loads and Power Systems for the DEMO Nuclear Fusion Project
EU-DEMO is a European project, having the ambitious goal to be the first demonstrative
power plant based on nuclear fusion. The electrical power that is expected to be produced is in the
order of 700â800 MW, to be delivered via a connection to the European High Voltage electrical grid.
The initiation and control of fusion processes, besides the problems related to the nuclear physics,
need very complex electrical systems. Moreover, also the conversion of the output power is not
trivial, especially because of the inherent discontinuity in the EU-DEMO operations. The present
article concerns preliminary studies for the feasibility and realization of the nuclear fusion power
plant EU-DEMO, with a special focus on the power electrical systems. In particular, the first stage of
the study deals with the survey and analysis of the electrical loads, starting from the steady-state
loads. Their impact is so relevant that could jeopardy the efficiency and the convenience of the plant
itself. Afterwards, the loads are inserted into a preliminary internal distribution grid, sizing the main
electrical components to carry out the power flow analysis, which is based on simulation models
implemented in the DIgSILENT PowerFactory software
Confidence driven TGV fusion
We introduce a novel model for spatially varying variational data fusion,
driven by point-wise confidence values. The proposed model allows for the joint
estimation of the data and the confidence values based on the spatial coherence
of the data. We discuss the main properties of the introduced model as well as
suitable algorithms for estimating the solution of the corresponding biconvex
minimization problem and their convergence. The performance of the proposed
model is evaluated considering the problem of depth image fusion by using both
synthetic and real data from publicly available datasets
Modeling the evolution space of breakage fusion bridge cycles with a stochastic folding process
Breakage-Fusion-Bridge cycles in cancer arise when a broken segment of DNA is duplicated and an end from each copy joined together. This structure then 'unfolds' into a new piece of palindromic DNA. This is one mechanism responsible for the localised amplicons observed in cancer genome data. The process has parallels with paper folding sequences that arise when a piece of paper is folded several times and then unfolded. Here we adapt such methods to study the breakage-fusion-bridge structures in detail. We firstly consider discrete representations of this space with 2-d trees to demonstrate that there are 2^(n(n-1)/2) qualitatively distinct evolutions involving n breakage-fusion-bridge cycles. Secondly we consider the stochastic nature of the fold positions, to determine evolution likelihoods, and also describe how amplicons become localised. Finally we highlight these methods by inferring the evolution of breakage-fusion-bridge cycles with data from primary tissue cancer samples
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