Results 21 to 30 of about 573,440 (274)
Jitter-Robust Phase Retrieval Wavefront Sensing Algorithms [PDF]
Sensors, 2022 Phase retrieval wavefront sensing methods are now of importance for imaging quality maintenance of space telescopes. However, their accuracy is susceptible to line-of-sight jitter due to the micro-vibration of the platform, which changes the intensity ...
Liang Guo +6 more
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Eikonal Phase Retrieval: unleashing the potential of fourth-generation sources for enhanced propagation-based tomography on biological samples [PDF]
Journal of Synchrotron RadiationThe evolution of synchrotrons towards higher brilliance beams has increased the possible sample-to-detector propagation distances for which the source confusion circle does not lead to geometrical blurring.
Alessandro Mirone +14 more
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Measurement of the Aspherical Optical Surfaces with the Improved Phase Retrieval [PDF]
Micromachines, 2022 In order to verify the estimated wave-front ability of the phase retrieval, a method utilized in the measurement of the aspherical optical surfaces using the phase retrieval technology is described.
Xinxue Ma +3 more
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Phase Transitions in Phase Retrieval [PDF]
, 2014 Consider a scenario in which an unknown signal is transformed by a known linear operator, and then the pointwise absolute value of the unknown output function is reported.
Mixon, Dustin G.
core +2 more sources
Sub-Millisecond Phase Retrieval for Phase-Diversity Wavefront Sensor [PDF]
Sensors, 2020 We propose a convolutional neural network (CNN) based method, namely phase diversity convolutional neural network (PD-CNN) for the speed acceleration of phase-diversity wavefront sensing.
Yu Wu +3 more
doaj +2 more sources
Frame Phase-Retrievability and Exact Phase-Retrievable Frames [PDF]
Journal of Fourier Analysis and Applications, 2019 An exact phase-retrievable frame $\{f_{i}\}_{i}^{N}$ for an $n$-dimensional Hilbert space is a phase-retrievable frame that fails to be phase-retrievable if any one element is removed from the frame. Such a frame could have different lengths. We shall prove that for the real Hilbert space case, exact phase-retrievable frame of length $N$ exists for ...
Han, Deguang +3 more
openaire +2 more sources
Quantization-aware phase retrieval [PDF]
International Journal of Wavelets, Multiresolution and Information Processing, 2020 We address the problem of phase retrieval (PR) from quantized measurements. The goal is to reconstruct a signal from quadratic measurements encoded with a finite precision, which is indeed the case in practical applications. We develop an iterative projected-gradient-type algorithm that recovers the signal subject to ensuring consistency with the ...
Mukherjee, Subhadip +1 more
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Low rank phase retrieval [PDF]
2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2017 To appear in IEEE Trans.
Vaswani, Namrata +2 more
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SPIE Proceedings, 2015 We answer a number of open problems concerning phase retrieval and phase retrieval by projections. In particular, one main theorem classifies phase retrieval by projections via collections of sequences of vectors allowing norm retrieval. Another key result computes the minimal number of vectors needed to add to a frame in order for it to possess the ...
Cahill, Jameson +3 more
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Phase Retrieval with Sparse Phase Constraint [PDF]
SIAM Journal on Mathematics of Data Science, 2020 For the first time, this paper investigates the phase retrieval problem with the assumption that the phase (of the complex signal) is sparse in contrast to the sparsity assumption on the signal itself as considered in the literature of sparse signal processing.
Nguyen Hieu Thao +3 more
openaire +3 more sources