Results 1 to 10 of about 1,260,020 (249)

Numerical model for evaluating the speckle activity and characteristics of bone tissue under the biospeckle laser system

Journal of Innovative Optical Health Sciences, 2021
This paper discusses and studies the composition and characteristics of biospeckle on the surface of bone tissues. We used a laser speckle device to capture biospeckle patterns from fresh pig bone tissue. Traditional speckle activity metrics were used to
Xin Tang, Ping Zhong, Yinrui Gao, Haowei Hu   +3 more
doaj   +1 more source

Study on Speckle Noise Reduction in Laser Projection Displays

Photonics
Laser speckle has a negative effect on laser projectors, so reducing laser speckle is crucial for the development of laser projector displays. We primarily focus on studying the laser speckle contrast of laser projector displays and the mechanism for ...
Hongyou Zhang, Yu Hu, Shuihai Peng, Yong Liu   +3 more
doaj   +1 more source

Spatiotemporal characteristics of dynamic speckle from a 3D target in atmospheric turbulence

Heliyon, 2023
Spatiotemporal correlation function is the basic characteristic of dynamic laser speckle and the basis of various applications. The correlation function of the speckle intensity from a 3D target in turbulent atmosphere is derived based on the model of ...
Wang Liguo, Gong Lei, Li Yaqing, Yang Zhiqiang, Yang Lihong, Li Yao   +5 more
doaj   +1 more source

Different methods for characterizing surface roughness using laser speckle technique

Iraqi Journal of Physics, 2019
In this work, results from an optical technique (laser speckle technique) for measuring surface roughness was done by using statistical properties of speckle pattern from the point of view of computer image texture analysis.
Mayada B. Al-Quzweny
doaj   +1 more source

Nonsequential Speckle Reduction Method by Generating Uncorrelated Laser Subbeams With Equivalent Intensity Using a Reflective Spatial Light Modulator

IEEE Photonics Journal, 2017
Sequential speckle reduction methods demand the usage of fast modulators due to the short integration period of human eyes. Here, a nonsequential speckle reduction method by splitting one laser beam with short coherence length into uncorrelated laser ...
Zhaomin Tong, Shaohua Song, Suotang Jia, Xuyuan Chen   +3 more
doaj   +1 more source

Synchronized renal blood flow dynamics mapped with wavelet analysis of laser speckle flowmetry data. [PDF]

PLoS ONE, 2014
Full-field laser speckle microscopy provides real-time imaging of superficial blood flow rate. Here we apply continuous wavelet transform to time series of speckle-estimated blood flow from each pixel of the images to map synchronous patterns in ...
Alexey R Brazhe, Donald J Marsh, Niels-Henrik Holstein-Rathlou, Olga Sosnovtseva   +3 more
doaj   +1 more source

Improving Contrast Accuracy and Resolution of Laser Speckle Contrast Imaging Using Two-Dimensional Entropy Algorithm

IEEE Access, 2021
A two-dimensional entropy laser speckle contrast imaging (E-LSCI) algorithm is proposed to improve the accuracy and resolution of laser speckle contrast imaging (LSCI) systems.
Xinglong Liu, Hui Yang, Ran Li
doaj   +1 more source

Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires

Heliyon, 2023
Miniaturized and pure static devices are expected to be used in laser-imaging systems for speckle reduction. In this study, a pure static device based on polymer-stabilized liquid crystal (PSLC) doped with Ag nanowires was developed to effectively ...
Xin Jiang, Weilong Zhou, Wei Wang, Zichun Le, Wen Dong   +4 more
doaj   +1 more source

Speckle Noise Reduction via Linewidth Broadening for Planetary Laser Reflectance Spectrometers

Remote Sensing
The low obliquity of the Moon leads to challenging solar illumination conditions at the poles, especially for passive reflectance measurements aimed at determining the presence and extent of surface volatiles.
Daniel R. Cremons, Gregory B. Clarke, Xiaoli Sun   +2 more
doaj   +1 more source

Speckle-Based Sensing of Microscopic Dynamics in Expanding Polymer Foams: Application of the Stacked Speckle History Technique

Sensors, 2021
Microscopic structural rearrangements in expanding polylactide foams were probed using multiple dynamic scattering of laser radiation in the foam volume.
Dmitry Zimnyakov, Marina Alonova, Ekaterina Ushakova, Sergey Volchkov, Olga Ushakova, Daniil Klimov, Ilya Slavnetskov, Anna Kalacheva   +7 more
doaj   +1 more source