Zobrazeno 1 - 10
of 44
pro vyhledávání: '"T. Herman"'
Publikováno v:
Inverse Problems. 36:089601
Autor:
Gabor T. Herman, Kai Tobias Block, Elias S. Helou, Ravinder R. Regatte, Leon Axel, Marcelo V. W. Zibetti
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
Estimation of the Discrete-Time Fourier Transform (DTFT) at points of a finite domain arises in many imaging applications. A new approach to this task, the Golden Angle Linogram Fourier Domain (GALFD), is presented, together with a computationally fa
Algorithms for convex feasibility find or approximate a point in the intersection of given closed convex sets. Typically there are only finitely many convex sets, but the case of infinitely many convex sets also has some applications. In this context
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ecb448e3588f3bc02467646d3bf87ab1
http://arxiv.org/abs/1807.00234
http://arxiv.org/abs/1807.00234
Autor:
Gabor T. Herman, Edgar Garduño
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 be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8029f7f943e9a1aa463728351a3c3f0
Publikováno v:
Journal of Visual Communication and Image Representation. 23:883-891
It is often the case that the same object is imaged in different ways, resulting in digital pictures of (some parts of) it at different resolutions. This leads to the combinatorial problem of ''embedding'' one of these pictures into the other in a wa
Publikováno v:
Inverse Problems. 34:034001
The conjugate gradient (CG) method is commonly used for the relatively-rapid solution of least squares problems. In image reconstruction, the problem can be ill-posed and also contaminated by noise; due to this, approaches such as regularization shou
Autor:
Gabor T. Herman, Edgar Garduño
Publikováno v:
Theoretical Computer Science. 346:281-299
An implicit surface of a density function is the set of points at which the value of the function is equal to a fixed threshold. An object that is defined as the collection of points at which the density function value is above the threshold can be v
Autor:
Hstau Y. Liao, Gabor T. Herman
Publikováno v:
Discrete Applied Mathematics. 139(1-3):149-170
Image modeling using Gibbs priors was shown to be effective in image reconstruction problems. This motivated us to evaluate three techniques for estimating the priors: the heuristic method, the histogram method and Borges' method. We found that both
Publikováno v:
Inverse Problems. 19:933-949
Three-dimensional reconstruction of nano-scale objects (such as biological macromolecules) can be accomplished using data recorded with a transmission electron microscope. An image obtained by a transmission electron microscope can be conceived of as
Autor:
Yair Censor, Gabor T. Herman
Publikováno v:
SIAM Journal on Optimization. 13:283-297
The notion of relaxation is well understood for orthogonal projections onto convex sets. For general Bregman projections it was considered only for hyperplanes, and the question of how to relax Bregman projections onto convex sets that are not linear