Results 51 to 60 of about 3,214,745 (368)

Singularities in Speckled Speckle [PDF]

, 2007
Speckle patterns produced by random optical fields with two (or more) widely different correlation lengths exhibit speckle spots that are themselves highly speckled.
Baranova, Berry, Berry, Born, Cartwright, David A. Kessler, Dennis, Dennis, Dennis, Freund, Freund, Freund, Freund, Freund, Freund, Goodman, Halperin, Isaac Freund, Kessler, Kessler, Longuet-Higgins, Nye, Nye, Nye, Rice   +24 more
core   +4 more sources

Assessing Intraoperative Laser Speckle Contrast Imaging of Parathyroid Glands in Relation to Total Thyroidectomy Patient Outcomes

Thyroid, 2021
Background: Accurate assessment of parathyroid gland vascularity is important during thyroidectomy to preserve the function of parathyroid glands and to prevent postoperative hypocalcemia.
Emmanuel A. Mannoh, Giju Thomas, Naira Baregamian, S. Rohde, C. Solórzano, A. Mahadevan-Jansen   +5 more
semanticscholar   +1 more source

Statistics of local speckle contrast

Journal of the Optical Society of America A, 2007
In describing the first-order properties of laser speckle under polarized illumination conditions, it is almost an article of faith that the contrast is unity. In many processing schemes, however, the contrast defined as the quotient of the standard deviation and the mean is calculated over a localized spatial region. In such cases, this local contrast
Duncan, Donald D., Kirkpatrick, Sean J., Wang, Ruikang K.   +2 more
openaire   +4 more sources

On-sky speckle nulling demonstration at small angular separation with SCExAO [PDF]

, 2014
This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project.
Clergeon, Christophe, Currie, Thayne, Guyon, Olivier, Jovanovic, Nemanja, Kudo, Tomoyuki, Martinache, Frantz, McElwain, Michael, Singh, Garima, Tamura, Motohide, Thalmann, Christian   +9 more
core   +5 more sources

Enhancement of microvessel in laser speckle image using gaussian kernel template [PDF]

Journal of Innovative Optical Health Sciences, 2019
Laser speckle contrast imaging (LSCI) is an optical imaging method, which can monitor microvascular flow variation directly without addition of any ectogenous dye.
Yameng Zhang, Yuemei Zhao, Weitao Li, Zhiyu Qian, Lidong Xing   +4 more
doaj   +1 more source

Comparison between Speckle Plethysmography and Photoplethysmography during Cold Pressor Test Referenced to Finger Arterial Pressure

Sensors, 2023
Speckle Plethysmography (SPG) and Photoplethysmography (PPG) are different biophotonics technologies that allow for measurement of haemodynamics. As the difference between SPG and PPG under low perfusion conditions is not fully understood, a Cold Pressor
Jorge Herranz Olazabal, Ilde Lorato, Jesse Kling, Marc Verhoeven, Fokko Wieringa, Chris Van Hoof, Willem Verkruijsse, Evelien Hermeling   +7 more
doaj   +1 more source

Spatiotemporal laser speckle contrast analysis for blood flow imaging with maximized speckle contrast

Journal of Biomedical Optics, 2010
Laser speckle contrast imaging is a technique used for imaging blood flow without scanning. Though several studies have attempted to combine spatial and temporal statistics of laser speckle images for reducing image noise as well as preserving acceptable spatiotemporal resolution, the statistical accuracy of these spatiotemporal methods has not been ...
Jianjun, Qiu, Pengcheng, Li, Weihua, Luo, Jia, Wang, Hongyan, Zhang, Qingming, Luo   +5 more
openaire   +2 more sources

Speckle noise and dynamic range in coronagraphic images [PDF]

, 2007
This paper is concerned with the theoretical properties of high contrast coronagraphic images in the context of exoplanet searches. We derive and analyze the statistical properties of the residual starlight in coronagraphic images, and describe the ...
Andre Ferrari, Cagigal M. P., Canales V. F., Claude Aime, Codona J. L., Gladysz S., Laurent Jolissaint, Lyot B., Macintosh B. A., Marois C., Moffat A. F. J., Remi Soummer, Roddier F., Serabyn E., Shaklan S. B., Wallace J. K.   +15 more
core   +1 more source

Contribution of speckle noise in near-infrared spectroscopy measurements [PDF]

, 2019
Near-infrared spectroscopy (NIRS) is widely used in biomedical optics with applications ranging from basic science, such as in functional neuroimaging, to clinical, as in pulse oximetry.
Boas, David A., Cheng, Xiaojun, Li, Xinge, Ortega-Martinez, Antonio, Yucel, Meryem Ayşe, Zimmermann, Bernhard   +5 more
core   +1 more source

Exploring TEM Coherence Properties via Speckle Contrast Analysis in Coherent Electron Scattering of Amorphous Material

Nanomaterials, 2023
We investigate the coherence properties of a transmission electron microscope by analyzing nano-diffraction speckles originating from bulk metallic glass. The spatial correlation function of the coherent diffraction patterns, obtained in the transmission
Ji-Hwan Kwon, Joohyun Lee, Je In Lee, Byeong-Gwan Cho, Sooheyong Lee   +4 more
doaj   +1 more source