Speckle Interferometry, Speckle Masking, Speckle Spectroscopy and Speckle Frame Selection [PDF]
International Astronomical Union Colloquium, 1984 AbstractHigh-resolution speckle imaging is one of the most fascinating possibilities of a Very Large Telescope (VLT). Various speckle methods can yield a resolution of about 0.01" with a 8-m to 10-m VLT. As exiting as the resolution is the limiting magnitude of the speckle methods. The limiting magnitude is extremely seeingdependent.
openaire +1 more source
Speckle filtering of Synthetic Aperture Radar images using filters with object-size-adapted windows
International Journal of Digital Earth, 2018 Speckle degrades the radiometric quality of a Synthetic Aperture Radar (SAR) image. Previous methods for speckle reduction have used a fixed-size window for filtering the entire image.
Sahel Mahdavi +4 more
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 +1 more source
Review of speckle on high resolution synthetic aperture radar imagery
Nantong Daxue xuebao. Ziran kexue ban, 2022 Understanding the speckle mechanism and modelling the physical representation is the theoretical basis for understanding synthetic aperture radar(SAR) images.
XU Zhihuo; LI Hengchao
doaj +1 more source
Demonstration of a Speckle Based Sensing with Pulse-Doppler Radar for Vibration Detection
Sensors, 2018 In previous works, an optical technique for extraction and separation of remote static vibrations has been demonstrated. In this paper, we will describe an approach in which RF speckle movement is used to extract remote vibrations of a static target. The
Nisan Ozana +6 more
doaj +1 more source
Single-Shot Structured Light Sensor for 3D Dense and Dynamic Reconstruction
Sensors, 2020 Structured light (SL) has a trade-off between acquisition time and spatial resolution. Temporally coded SL can produce a 3D reconstruction with high density, yet it is not applicable to dynamic reconstruction.
Feifei Gu, Zhan Song, Zilong Zhao
doaj +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
Superoscillation in speckle patterns [PDF]
, 2008 Waves are superoscillatory where their local phase gradient exceeds the maximum wavenumber in their Fourier spectrum. We consider the superoscillatory area fraction of random optical speckle patterns.
Hamilton, AC +11 more
core +1 more source
Laser Speckle Photometry - an advanced method for defect detection in ceramics
, 2022 Paper 1083415, 7 S.Due to the special structural and functional properties, the advanced ceramic technology plays an important role in many areas of the industry. Fraunhofer IKTS develops novel ceramic materials for industrial applications, e.g.
Cikalova, Ulana +2 more
core +1 more source
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