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Forehead flap perfusion monitored by laser speckle contrast imaging: Importance of flap length and thickness. [PDF]

JPRAS Open
Berggren J, Ottosson JN, Albinsson J, Sheikh R, Merdasa A, Tenland K.   +5 more
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Speckle evaluation in laser display: From speckle contrast to speckle influence degree

Optics Communications, 2020
Abstract Speckle contrast (SC) is universally used to evaluate speckle in laser display, which has virtues of briefness in calculating and definitude in physical meaning. But the results characterized by SC is usually inconsistent with human visual perception.
Yuan Yuan, Y. Bi, M. Sun, Dong Zhou Wang, D. Wang, Weinan Gao, Shuo Zhang   +6 more
semanticscholar   +2 more sources

Computational speckle contrast optical tomography

Dynamics and Fluctuations in Biomedical Photonics XVI, 2019
We present and validate a forward model for modeling light propagation in brain tissue. The model is a dynamic light scattering Monte Carlo simulation that tracks the dynamic scattering events of a photon through a brain tissue geometry.
David R. Miller, Chakameh Z. Jafari, C. Sullender, Samuel A. Mihelic, Ahmed M. Hassan, A. Dunn   +5 more
semanticscholar   +2 more sources

Functional imaging of human retina using integrated multispectral and laser speckle contrast imaging

Journal of Biophotonics, 2021
A novel integration of retinal multispectral imaging (MSI), retinal oximetry and laser speckle contrast imaging (LSCI) is presented for functional imaging of retinal blood vessels that could potentially allow early detection or monitoring of functional ...
Ximeng Feng, Yue Yu, Da Zou, Zi Jin, Chuanqing Zhou, Gangjun Liu, J. Fujimoto, Changhui Li, Yanye Lu, Q. Ren   +9 more
semanticscholar   +1 more source

Speckle Symmetry with High‐Contrast Coronagraphs

Publications of the Astronomical Society of the Pacific, 2002
We investigate the pattern of residual speckles obtained with high-contrast coronagraphs and extreme adaptive optics systems. In particular, we provide evidence of symmetry occurring for very small phase defects depending only on the ability of the coronagraph to attenuate the pupil diffraction pattern.
Boccaletti, Anthony, Riaud, Pierre, Rouan, Daniel   +2 more
openaire   +2 more sources

Correcting sampling bias in speckle contrast imaging

Optics Letters, 2022
When performing spatial or temporal laser speckle contrast imaging (LSCI), contrast is generally estimated from localized windows containing limited numbers of independent speckle grains N S . This leads to a systematic bias in the estimated speckle contrast.
Shuqi Zheng, Jerome Mertz
openaire   +2 more sources

Optimizing the parameters for measuring laser speckle and speckle contrast

Applied Optics, 2014
Evaluating the contrast in speckle patterns produced by laser projection displays can facilitate the development of methods to suppress such imperfection. Computer simulations were first conducted to characterize the contrast (C(gs)) of fully developed speckle patterns with spatial factor k and power factor r.
Wei-Feng, Hsu, Min-Chun, Chou
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Measurement of speckle pattern contrast

Journal of Optics, 1979
Knowledge of statistical properties of intensity in speckle patterns is of great interest. The authors give a method to measure the contrast. A laboratory simulation of the problem has been realised. Stellar images may be regarded as speckle patterns and the contrast should give some information concerning either the light source or the nature of the ...
D Dupuis, G Mas, C Peremarti
openaire   +1 more source

The evaluation of speckle contrast with variable speckle generator

Journal of the Society for Information Display, 2011
Abstract— While laser projection has many advantages, there is a problem with speckle patterns generated as a result of interference of the laser beam and results in bad effects to observers. In 2010, a variable speckle generator, which produces an angular shift of incident light to the screen and generates variable speckle patterns, was suggested.
Makio Kurashige, Kazutoshi Ishida, Tomoe Takanokura, Yasuyuki Ohyagi, Masachika Watanabe   +4 more
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Aspects of speckle contrast metrology

SPIE Proceedings, 2010
Recent revitalization of interests in applying speckle techniques gives rise to the concern of measurement accuracy. In particular, speckle contrast, an important metric in numerous optical techniques, is affected by many factors related to light sources, propagation media, and receivers.
L. Tchvialeva, I. Markhvida, T. K. Lee
openaire   +1 more source