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TwoDimensional Phase Unwrapping Using Neural Networks
"... Imaging systems that construct an image from phase information in received signals include synthetic aperture radar (SAR) and optical Doppler tomography (ODT) systems. A fundamental problem in the image formation is phase ambiguity; i.e. it is impossible to distinguish between phases that differ by ..."
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by 2π. Phase unwrapping in two dimensions essentially consists of detecting the pixel locations of the phase discontinuities, finding an ordering among the pixel locations for unwrapping the phase, and adding offsets of multiples of 2π. In this paper, we propose a new method for detecting phase
A multigrid approach to twodimensional phase unwrapping
 Numer. Linear Algebra Appl
"... The twodimensional phase unwrapping problem is studied. Using the minimum L pnorm approach, we apply three different nonlinear multigrid algorithms for reconstructing surfaces from their “wrapped” values—two classical approaches and a novel Multilevel Nonlinear Method (MNM). The methods prove to b ..."
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Cited by 3 (1 self)
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The twodimensional phase unwrapping problem is studied. Using the minimum L pnorm approach, we apply three different nonlinear multigrid algorithms for reconstructing surfaces from their “wrapped” values—two classical approaches and a novel Multilevel Nonlinear Method (MNM). The methods prove
Isotropic inverseproblem approach for twodimensional phase unwrapping
"... We propose a new technique for twodimensional phase unwrapping. The unwrapped phase is found as the solution of an inverse problem that consists in the minimization of an energy functional. The latter includes a weighted data fidelity term that favors sparsity in the error between the true and wrap ..."
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We propose a new technique for twodimensional phase unwrapping. The unwrapped phase is found as the solution of an inverse problem that consists in the minimization of an energy functional. The latter includes a weighted data fidelity term that favors sparsity in the error between the true
A FactorTwo Approximation Algorithm for TwoDimensional PhaseUnwrapping
"... Twodimensional phase unwrapping is the problem of deducing unambiguous “phase ” from values known only modulo 2π. Many authors agree that the objective of phase unwrapping should be to find a (weighted) minimum of the number of places where adjacent discretized phase values differ by more than π. T ..."
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Twodimensional phase unwrapping is the problem of deducing unambiguous “phase ” from values known only modulo 2π. Many authors agree that the objective of phase unwrapping should be to find a (weighted) minimum of the number of places where adjacent discretized phase values differ by more than π
TwoDimensional Phase Unwrapping for the Design of Distributed Phase Plates
"... When the surface of a distributed phase plate (DPP) is designed via the phase retrieval method, the resulting phase profile is discontinuous because of the use of the inverse tangent function. The precise manufacturing of a discontinuous phase plate is impossible, however, and any imperfections scat ..."
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When the surface of a distributed phase plate (DPP) is designed via the phase retrieval method, the resulting phase profile is discontinuous because of the use of the inverse tangent function. The precise manufacturing of a discontinuous phase plate is impossible, however, and any imperfections
Network Centric Warfare: Developing and Leveraging Information Superiority
 Command and Control Research Program (CCRP), US DoD
, 2000
"... the mission of improving DoD’s understanding of the national security implications of the Information Age. Focusing upon improving both the state of the art and the state of the practice of command and control, the CCRP helps DoD take full advantage of the opportunities afforded by emerging technolo ..."
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Cited by 308 (5 self)
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the mission of improving DoD’s understanding of the national security implications of the Information Age. Focusing upon improving both the state of the art and the state of the practice of command and control, the CCRP helps DoD take full advantage of the opportunities afforded by emerging technologies. The CCRP pursues a broad program of research and analysis in information superiority, information operations, command and control theory, and associated operational concepts that enable us to leverage shared awareness to improve the effectiveness and efficiency of assigned missions. An important aspect of the CCRP program is its ability to serve as a bridge between the operational, technical, analytical, and educational communities. The CCRP provides leadership for the command and control research community by: n n
Fast and Accurate Phase Unwrapping
"... More and more speech technology and signal processing applications make use of the phase information. A proper estimation and representation of the phase goes inextricably along with a correct phase unwrapping, which refers to the problem of finding the instance of the phase function chosen to ens ..."
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with respect to the unit circle. The proposed method is compared to five stateoftheart phase unwrappers on a large dataset of both synthetic random and real speech signals. By leveraging the two aforementioned considerations, the proposed approach is shown to perform an exact estimation of the unwrapped
Phase unwrapping in three dimensions with application to InSAR time series
 J. Opt. Soc. Amer. A
"... The problem of phase unwrapping in two dimensions has been studied extensively in the past two decades, but the threedimensional (3D) problem has so far received relatively little attention. We develop here a theoretical framework for 3D phase unwrapping and also describe two algorithms for impleme ..."
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Cited by 11 (2 self)
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The problem of phase unwrapping in two dimensions has been studied extensively in the past two decades, but the threedimensional (3D) problem has so far received relatively little attention. We develop here a theoretical framework for 3D phase unwrapping and also describe two algorithms
Quantitative Testing of Probabilistic Phase Unwrapping Methods
, 2001
"... author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ii The reconstruction of a phase surface from the observed principal values is required for a ..."
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for a number of applications, including synthetic aperture radar (SAR) and magnetic resonance imaging (MRI). However, the process of reconstruction, called “phase unwrapping”, is an illposed problem. One class of phaseunwrapping algorithms uses smoothness prior models to remedy this situation. We
Results 1  10
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140,357