Results 51 to 60 of about 237,317 (388)
Semiclassical theory of speckle correlations [PDF]
, 2013 Coherent wave propagation in random media results in a characteristic speckle pattern, with spatial intensity correlations with short-range and long-range behavior. Here, we show how the speckle correlation function can be obtained from a ray picture for
Breitkreiz, Maxim, Brouwer, Piet W.
core +2 more sources
Optical Energy Variability Induced by Speckle: The Cases of MERLIN and CHARM-F IPDA Lidar
Atmosphere, 2019 In the context of the FrenchGerman space lidar mission MERLIN (MEthane Remote LIdar missioN) dedicated to the determination of the atmospheric methane content, an end-to-end mission simulator is being developed.
Vincent Cassé +4 more
doaj +1 more source
Statistical Region Based Segmentation of Ultrasound Images [PDF]
, 2008 Segmentation of ultrasound images is a challenging problem due to speckle, which corrupts the image and can result in weak or missing image boundaries, poor signal to noise ratio, and diminished contrast resolution.
Ayed +30 more
core +3 more sources
Beamforming and Speckle Reduction Using Neural Networks
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2019 With traditional beamforming methods, ultrasound B-mode images contain speckle noise caused by the random interference of subresolution scatterers. In this paper, we present a framework for using neural networks to beamform ultrasound channel signals ...
D. Hyun +3 more
semanticscholar +1 more source
Ten Years of Speckle Interferometry at SOAR [PDF]
, 2018 Since 2007, close binary and multiple stars are observed by speckle interferometry at the 4.1 m Southern Astrophysical Research (SOAR) telescope. The HRCam instrument, observing strategy and planning, data processing and calibration methods, developed ...
A. Tokovinin
semanticscholar +1 more source
SAR Image Despeckle With CNN Using a Novel Logarithmic Discrete Cosine Transform-Based Loss
IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingThe coherent nature of imaging in synthetic aperture radar (SAR) inevitably gives rise to speckle noise, a challenge exacerbated by the constrained bandwidth and limited look angles.
Ammar Saleem +2 more
doaj +1 more source
Photon-Counting Security Tagging and Verification Using Optically Encoded QR Codes
IEEE Photonics Journal, 2014 We propose an optical security method for object authentication using photon-counting encryption implemented with phase encoded QR codes. By combining the full phase double-random-phase encryption with photon-counting imaging method and applying an ...
A. Markman, B. Javidi, M. Tehranipoor
doaj +1 more source
Speckle tracking approaches in speckle sensing [PDF]
SPIE Proceedings, 2017 This paper reports some initial investigations into the application of feature tracking algorithms as an alternative data processing method for speckle correlation sensors capable of determining both the speckle pattern translation and rotation. The accuracy of translation measurements using the feature tracking approach was found to be similar to that
Charrett, Thomas O. H. +2 more
openaire +2 more sources
, 2007 We describe an extension of multi-speckle diffusing wave spectroscopy adapted to follow the non-stationary microscopic dynamics in drying films and coatings in a very reactive way and with a high dynamic range.
Brun, Alice +3 more
core +2 more sources
Spatially adaptive polarimetric image despeckling using bandelet transform
European Journal of Remote Sensing, 2020 Polarimetric Synthetic Aperture Radar (PolSAR) imaging extended SAR applications by exploring the polarimetric properties of the target scatterers. Similar to SAR images, PolSAR images are prone to multiplicative speckle noise due to its coherent imaging
Roy Thankachan +2 more
doaj +1 more source