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Laser speckle reduction based on angular diversity induced by Piezoelectric Benders [PDF]
Journal of the European Optical Society-Rapid Publications, 2013 Speckle reduction techniques have been investigated in display systems with coherent light sources. We propose a simple but efficient method to reduce speckle via two fast vibrating piezoelectric benders.
Ouyang G. +4 more
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Singularities in speckled speckle [PDF]
Optics Letters, 2008 Speckle patterns produced by random optical fields with two (or more) widely different correlation lengths exhibit speckle spots that are themselves highly speckled. Using computer simulations and analytic theory we present results for the point singularities of speckled speckle fields: optical vortices in scalar (one polarization component) fields; C ...
Freund, Isaac, Kessler, David A.
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Speckle reduction in double-pass retinal images using variable-focus lenses [PDF]
Journal of the European Optical Society-Rapid Publications, 2015 Speckle arises in double-pass images when coherent light is scattered by the retina. Since this noise degrades the images that are used to characterize the eye, there is special attention in reducing speckle when working with instruments based on retina ...
García-Guerra C. E. +3 more
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Remote Sensing, 2021 The detection and removal of erroneous pixels is a critical pre-processing step in producing chlorophyll-a (chl-a) concentration values to adequately understand the bio-physical oceanic process using optical satellite data.
Ji-Eun Park, Kyung-Ae Park
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Dynamic properties of speckled speckles [PDF]
SPIE Proceedings, 2010 We consider the dynamical properties of speckles observed through a second static diffuser arising from a linear or angularly displaced first diffuser. Analytical expressions are obtained for general situations where both the space between the displaced and the static diffuser and the space between the static diffuser and the plane of observation ...
G. Hanson, Steen +2 more
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Multi-Spectral Optimization for Tissue Probing Using Machine Learning
IEEE Photonics Journal, 2021 An optical approach for pigmented lesions detection in human skin is presented. As differences between normal skin tissue and pigmentation tissue (and even a change in pigmentation development) can be detected by their optical properties, this paper ...
Yarden Tzabari Kelman +4 more
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Singularities in speckled speckle: screening [PDF]
Journal of the Optical Society of America A, 2008 We study screening of optical singularities in random optical fields with two widely different length scales. We call the speckle patterns generated by such fields speckled speckle, because the major speckle spots in the pattern are themselves highly speckled.
Kessler, David A., Freund, Isaac
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Diagnostics, 2022 The ultrasonic technique is an indispensable imaging modality for diagnosis of breast cancer in young women due to its ability in efficiently capturing the tissue properties, and decreasing nega-tive recognition rate thereby avoiding non-essential ...
Gelan Ayana +4 more
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Physical Review E, 2010 We have measured the local and global statistics of singularity velocity, v, and have related these through the spatial correlation function of v. The distribution of v is a mixture of a mesoscopic distribution of global change in the speckle pattern and the distribution for v for Gaussian random fields.
Zhang, Sheng +2 more
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Optics Express, 2020 Speckle is the spatial fluctuation of irradiance seen when coherent light is reflected from a rough surface. It is due to light reflected from the surface’s many nooks and crannies accumulating vastly discrepant time delays, spanning much more than an optical period, en route to an observation point.
Justin Dove, Jeffrey H. Shapiro
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