Results 41 to 50 of about 154,931 (347)
Hyperuniformity in amorphous speckle patterns [PDF]
, 2018 Hyperuniform structures possess the ability to confine and drive light, although their fabrication is extremely challenging. Here we demonstrate that speckle patters obtained by a superposition of randomly arranged sources of Bessel beams can be used to ...
Ancora, Daniele +4 more
core +2 more sources
Speckle‐Based Optical Cryptosystem and its Application for Human Face Recognition via Deep Learning
Advanced Science, 2022 Face recognition has become ubiquitous for authentication or security purposes. Meanwhile, there are increasing concerns about the privacy of face images, which are sensitive biometric data and should be protected. Software‐based cryptosystems are widely
Qi Zhao +9 more
doaj +1 more source
Photonics, 2023 A convolutional neural network (CNN) was used to identify the morphology of rough particles from their interferometric images. The tested particles had the shapes of sticks, crosses, and dendrites as well as Y-like, L-like, and T-like shapes.
Alexis Abad +5 more
doaj +1 more source
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 +9 more
core +4 more sources
Journal of Medical Ultrasound, 2020 The "snowstorm" sign refers to the ultrasound appearance of motile hyperechoic specks within synovial fluid and has been reported to have a high specificity for gout. We describe three additional etiologies commonly encountered in the rheumatology clinic that can produce a snowstorm: calcium pyrophosphate deposition disease, fibrin collections/rice ...
Eugene Y. Kissin, Benjamin Persons
openaire +4 more sources
Toward an Estimation of the Optical Feedback Factor C on the Fly for Displacement Sensing
Sensors, 2021 In this paper, a method based on the inherent event-based sampling capability of laser optical feedback interferometry (OFI) is proposed to assess the optical feedback factor C when the laser operates in the moderate and strong feedback regimes.
Olivier D. Bernal +3 more
doaj +1 more source
A Practical Solution for SAR Despeckling With Adversarial Learning Generated Speckled-to-Speckled Images [PDF]
IEEE Geoscience and Remote Sensing Letters,(2020)1-5, 2019 In this letter, we aim to address a synthetic aperture radar (SAR) despeckling problem with the necessity of neither clean (speckle-free) SAR images nor independent speckled image pairs from the same scene, and a practical solution for SAR despeckling (PSD) is proposed.
arxiv +1 more source
Twisted speckle entities inside wavefront reversal mirrors
, 2009 The previously unknown property of the optical speckle pattern reported. The interference of a speckle with an oppositely moving phase-conjugated speckle wave produces a randomly distributed ensemble of a twisted entities (ropes) surrounding optical ...
A. Yu Okulov +6 more
core +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
, 2022 Speckle patterns are formed by random interferences of mutually coherent beams. While speckles are often considered as an unwanted noise in many areas, they also formed the foundation for the development of numerous speckle-based imaging, holography and sensing technologies.
openaire +2 more sources