Results 61 to 70 of about 3,214,745 (368)
Tandem-pulsed acousto-optics: an analytical framework of modulated high-contrast speckle patterns [PDF]
, 2015 Recently we presented acousto-optic (AO) probing of scattering media using addition or subtraction of speckle patterns due to tandem nanosecond pulses. Here we present a theoretical framework for ideal (polarized, noise-free) speckle patterns with unity ...
Resink, S.G., Steenbergen, W.
core +2 more sources
Optics Express, 2013 In laser speckle contrast imaging, it was usually suggested that speckle size should exceed two camera pixels to eliminate the spatial averaging effect. In this work, we show the benefit of enhancing signal to noise ratio by correcting the speckle contrast at small speckle size.
Jianjun, Qiu +4 more
openaire +2 more sources
Investigation of speckle pattern dynamics by laser speckle contrast imaging [PDF]
Biophotonics: Photonic Solutions for Better Health Care VI, 2018 Laser speckle contrast imaging (LSCI) is a simple and quite powerful method for visualization of flow, microcirculation and perfusion. In current study the speckle contrast variations towards breaking ergodicity conditions are considered with a final aim of envision a practical approach allowing real-time imaging of variations in dynamic properties of ...
Sdobnov, A. (Anton) +4 more
openaire +3 more sources
Synthetic exposure with a CMOS camera for multiple exposure speckle imaging of blood flow
Scientific Reports, 2022 Speckle contrast imaging is an established technique to obtain relative blood flow maps over wide fields of view. A major improvement of the method relies on the acquisition of raw speckle images at different exposure times but requires simultaneous ...
M. Chammas, F. Pain
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Observing Exoplanets with High-Dispersion Coronagraphy. II. Demonstration of an Active Single-Mode Fiber Injection Unit [PDF]
, 2017 High-dispersion coronagraphy (HDC) optimally combines high contrast imaging techniques such as adaptive optics/wavefront control plus coronagraphy to high spectral resolution spectroscopy.
Choquet, Elodie +14 more
core +3 more sources
Statistical Region Based Segmentation of Ultrasound Images [PDF]
, 2008 Segmentation of ultrasound images is a challenging problem due to speckle, which corrupts the image and can result in weak or missing image boundaries, poor signal to noise ratio, and diminished contrast resolution.
Ayed +30 more
core +3 more sources
, 2021 The laser speckle contrast imaging allows the determination of the flow motion in a sequence of images. The aim of this study is to combine the speckle contrast imaging and machine learning methods to recognition of physiological fluids flow rate.
E. Kornaeva +4 more
semanticscholar +1 more source
SFADI: the Speckle-Free Angular Differential Imaging method [PDF]
, 2017 We present a new processing technique aimed at significantly improving the angular differential imaging method (ADI) in the context of high-contrast imaging of faint objects nearby bright stars in observations obtained with extreme adaptive optics (EXAO)
Antoniucci, Simone +5 more
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Applied Sciences, 2022 Coherent plane-wave compounding (CPWC) enables high-frame-rate ultrasound imaging, but the imaging quality is mainly determined by the beamforming method.
Yuanguo Wang +3 more
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Laser Speckle Modeling and Simulation for Biophysical Dynamics: Influence of Sample Statistics
Journal of Biomedical Photonics & Engineering, 2017 Laser speckle is a statistical phenomenon and should be treated as such when establishing experimental parameters for using laser speckle techniques to infer information about the dynamics of a coherently illuminated medium, such as biological tissue ...
Kosar Khaksari, Sean J. Kirkpatrick
doaj +1 more source