Results 21 to 30 of about 3,337,138 (296)
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 +3 more
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Objective speckle velocimetry for autonomous vehicle odometry [PDF]
, 2012 Speckle velocimetry is investigated as a means of determining odometry data with potential for application on autonomous robotic vehicles. The technique described here relies on the integration of translation measurements made by normalized cross ...
Charrett, Thomas O. H. +3 more
core +1 more source
Material characterization by laser speckle photometry
, 2022 Paper 841315The damage and stress conditions of large industrial components have to be tested continuously. Especially welding processes in the field of coal production demand a nondestructive monitoring of internal stresses under an external load.
Cikalova, U., Schreiber, J., Bendjus, B.
core +1 more source
Delaunay triangulation based image enhancement for echocardiography images [PDF]
, 2009 A novel image enhancement approach for automatic echocardiography image processing is proposed. The main steps include undecimated wavelet based speckle noise reduction, edge detection, followed by a regional enhancement process that employs Delaunay ...
Ahanathapillai, V. +2 more
core +2 more sources
IEEE Photonics Journal, 2015 We report on the implementation of a current drive modulation circuitry that is effective in suppressing speckle noise for laser diodes. The drive circuit allows for operating the laser diode current at constant dc or modulating the current with square ...
I. Yilmazlar, M. Sabuncu
doaj +1 more source
Estimation of Ultrasound Echogenicity Map from B-Mode Images Using Convolutional Neural Network
Sensors, 2020 In ultrasound B-mode imaging, speckle noises decrease the accuracy of estimation of tissue echogenicity of imaged targets from the amplitude of the echo signals.
Che-Chou Shen, Jui-En Yang
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Multi-frame speckle reduction in OCT using supercontinuum pumped by noise-like pulses [PDF]
Journal of Innovative Optical Health Sciences, 2019 In most coherent imaging modality, speckle noise is a major cause that blurs the boundary of tissues and degrades the image contrast. By utilizing the unique properties of supercontinuum (SC) generated by noise-like pulses (NLPs) and a simple multi-frame
Chengming Wang +10 more
doaj +1 more source
Speckle Reduction Using Stochastic Distances [PDF]
, 2012 This paper presents a new approach for filter design based on stochastic distances and tests between distributions. A window is defined around each pixel, samples are compared and only those which pass a goodness-of-fit test are used to compute the filtered value.
Leonardo Torres 0001 +2 more
openaire +4 more sources
Laser Speckle Reduction Using a Liquid Crystal Diffuser Enhanced with Redox Dopants
Advanced Photonics Research, 2021 Herein, a large reduction in the speckle noise is observed using a thin electroresponsive film consisting of a chiral nematic liquid crystal (LC) that has been enhanced with the addition of a redox dopant.
Yihan Jin +3 more
doaj +1 more source
Remote Sensing, 2020 Speckle reduction is a longstanding topic in synthetic aperture radar (SAR) images. Many different schemes have been proposed for the restoration of intensity SAR images.
Emanuele Dalsasso +4 more
doaj +1 more source