Results 71 to 80 of about 1,311,142 (167)

Evaluation of Parallel Level Sets and Bowsher's Method as Segmentation-Free Anatomical Priors for Time-of-Flight PET Reconstruction. [PDF]

open access: yesIEEE Trans Med Imaging, 2018
Schramm G   +7 more
europepmc   +1 more source

Symmetry and convexity of level sets of solutions to infinity Laplace's equation

open access: yesElectronic Journal of Differential Equations, 1998
We consider the Dirichlet problem $$displaylines{ -Delta_infty u=f(u) quad hbox{in }Omega,,cr u=0quad hbox{on }partialOmega,,} $$ where $Delta_infty u=u_{x_i}u_{x_j}u_{x_ix_j}$ and $f$ is a nonnegative continuous function.
Edi Rosset
doaj  

Convexity of level sets for solutions to nonlinear elliptic problems in convex rings

open access: yesElectronic Journal of Differential Equations, 2006
We find suitable assumptions for the quasi-concave envelope $u^*$ of a solution (or a subsolution) $u$ of an elliptic equation $F(x,u, abla u,D^2u)=0$ (possibly fully nonlinear) to be a viscosity subsolution of the same equation.
Paola Cuoghi, Paolo Salani
doaj  

CONNECTEDNESS, ARCWISE- CONNECTEDNESS AND CONVEXITY FOR LEVEL-SETS OF MULTIDIMENSIONAL DISTRIBUTION FUNCTIONS

open access: yesRatio Mathematica, 1994
Sufficient conditions for guaranteeing connectedness, arcwisc-conncctedness and convexity for level-sets of multidimensional distribution functions are provided.
Luis Tibiletti
doaj  

Segmentation of neonatal brain MR images using patch-driven level sets. [PDF]

open access: yesNeuroimage, 2014
Wang L   +7 more
europepmc   +1 more source

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