Statistical Properties of an Unassisted Image Quality Index for SAR Imagery
Remote Sensing, 2019 The M estimator is a recently proposed image-quality index used to evaluate the despeckling operation in SAR (Synthetic Aperture Radar) data. It is used also to rank despeckling filters and to improve their design.
Luis Gomez +2 more
doaj +1 more source
Dynamic instability of speckle patterns in nonlinear random media [PDF]
J. Opt. Soc. Am. B 21(1) 168-176 (2004), 2003 Linear stability analysis of speckle pattern resulting from multiple, diffuse scattering of coherent light waves in random media with intensity-dependent refractive index (noninstantaneous Kerr nonlinearity) is performed. The speckle pattern is shown to become unstable with respect to dynamic perturbations within a certain frequency band, provided that
arxiv +1 more source
A New Insight into Biospeckle Activity in Apple Tissues
Sensors, 2019 The monitoring and characterization of agricultural products before harvest or during ripening, storage, and shelf life has recently been increasingly explored in the literature.
Christelle Abou Nader +3 more
doaj +1 more source
Speckle statistics of entangled photons [PDF]
Phys. Rev. A 94, 013828 (2016), 2016 We consider the propagation of several entangled photons through an elastically scattering medium and study statistical properties of their speckle patterns. We find the spatial correlations of multiphoton speckles and their sensitivity to changes of system parameters.
arxiv +1 more source
3D B-mode ultrasound speckle reduction using deep learning for 3D registration applications [PDF]
arXiv, 2020 Ultrasound (US) speckles are granular patterns which can impede image post-processing tasks, such as image segmentation and registration. Conventional filtering approaches are commonly used to remove US speckles, while their main drawback is long run-time in a 3D scenario.
arxiv
At-wavelength metrology of an X-ray mirror using a downstream wavefront modulator
Journal of Synchrotron RadiationAt-wavelength metrology of X-ray optics plays a crucial role in evaluating the performance of optics under actual beamline operating conditions, enabling in situ diagnostics and optimization.
Tunhe Zhou, Lingfei Hu, Hongchang Wang
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
Speckle Decorrelation and Dynamic Range in Speckle Noise Limited Imaging [PDF]
arXiv, 2003 The useful dynamic range of an image in the diffraction limited regime is usually limited by speckles caused by residual phase errors in the optical system forming the image. The technique of speckle decorrelation involves introducing many independent realizations of additional phase error into a wavefront during one speckle lifetime, changing the ...
arxiv
Reducing speckle artifacts in digital holography through programmable filtration
ETRI Journal, 2019 We propose a speckle reduction technique in electronic holographic display systems, where digital micro‐mirror array devices are used as spatial light modulators.
Yongjun Lim +5 more
doaj +1 more source
Effect of average number of reference speckles on the SNR of object retrieved using off-axis holographic technique [PDF]
arXiv, 2017 The propagation of coherent light through a random scattering medium generates speckle pattern. Although the speckle is random in nature, the object information is scrambled into it. The scrambled object information can be retrieved using off-axis holographic technique where the retrieval is made from coherence hologram which is constructed from the ...
arxiv