Results 81 to 90 of about 2,210,509 (307)

Computerized tomography with total variation and with shearlets [PDF]

Inverse Problems, 2017
To reduce the x-ray dose in computerized tomography (CT), many constrained optimization approaches have been proposed aiming at minimizing a regularizing function that measures lack of consistency with some prior knowledge about the object that is being imaged, subject to a (predetermined) level of consistency with the detected attenuation of x-rays ...
Edgar Garduño, Gabor T. Herman
openaire   +2 more sources

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source

Multiclass total variation clustering [PDF]

, 2013
Ideas from the image processing literature have recently motivated a new set of clustering algorithms that rely on the concept of total variation.
James H. Von Brecht, Uminsky, David, Bresson, X, Xavier Bresson, Thomas Laurent, von Brecht, J, David Uminsky, Laurent, T   +7 more
core   +1 more source

Dualization and Automatic Distributed Parameter Selection of Total Generalized Variation via Bilevel Optimization [PDF]

, 2020
Total Generalized Variation (TGV) regularization in image reconstruction relies on an infimal convolution type combination of generalized first- and second-order derivatives.
Papafitsoros, Kostas, Hintermueller, M, Sun, Hongpeng, Rautenberg, Carlos N., Hintermüller, Michael, Rautenberg, CN, Sun, H, Papafitsoros, K   +7 more
core   +2 more sources

Viewpoint Selection for 3D-Games with f-Divergences

Entropy
In this paper, we present a novel approach for the optimal camera selection in video games. The new approach explores the use of information theoretic metrics f-divergences, to measure the correlation between the objects as viewed in camera frustum and ...
Micaela Y. Martin, Mateu Sbert, Miguel Chover   +2 more
doaj   +1 more source

A Direct Material Reconstruction Method for DECT Based on Total Variation and BM3D Frame

IEEE Access, 2019
Dual-energy computed tomography (DECT) has attracted the attention of clinical researchers because of its outstanding capabilities to identify and decompose materials.
Wenkun Zhang, Ailong Cai, Zhizhong Zheng, Linyuan Wang, Ningning Liang, Lei Li, Bin Yan, Guoen Hu   +7 more
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

When total variation is additive [PDF]

Proceedings of the American Mathematical Society, 1982
Let f f and g g be continuous functions of bounded variation on [ 0 , 1 ] [0,1] . We use the Dini derivates of f f and g g to give a necessary and sufficient condition that the equation V ( f +
openaire   +2 more sources

Regular Dependence of Total Variation on Parameters [PDF]

Real Analysis Exchange, 2004
If \(X\) is an interval, \(Y\) -- a metric space, \(T\) -- a set of parameters, and \(f: T\times X\to Y\) a function, then it can happen that \(f\) is measurable with respect to some \(\sigma\)-algebra while the function \(v:T\to X\), defined by \(v(t)\) equals to the total variation of \(f(t,\cdot)\), is not measurable.
Balcerzak, M., Kucia, A., Nowak, A.
openaire   +3 more sources

Phosphatidylinositol 4‐kinase as a target of pathogens—friend or foe?

FEBS Letters, EarlyView.
This graphical summary illustrates the roles of phosphatidylinositol 4‐kinases (PI4Ks). PI4Ks regulate key cellular processes and can be hijacked by pathogens, such as viruses, bacteria and parasites, to support their intracellular replication. Their dual role as essential host enzymes and pathogen cofactors makes them promising drug targets.
Ana C. Mendes, Guilherme M. Azevedo, Amanda P. Barcellos, Diana Bahia   +3 more
wiley   +1 more source