Results 71 to 80 of about 146,877 (332)
Quasi-Noise-Free and Detail-Preserved Digital Holographic Reconstruction
IEEE Access, 2019 The shortcoming of the coherence of digital holographic light sources leads to the generation of holographic reconstruction speckle noise, which seriously affects the quality of holographic reconstruction.
Ruyong Ren +4 more
doaj +1 more source
MuLoG, or How to apply Gaussian denoisers to multi-channel SAR speckle reduction? [PDF]
, 2017 Speckle reduction is a longstanding topic in synthetic aperture radar (SAR) imaging. Since most current and planned SAR imaging satellites operate in polarimetric, interferometric or tomographic modes, SAR images are multi-channel and speckle reduction techniques must jointly process all channels to recover polarimetric and interferometric information.
arxiv +1 more source
Convolutional neural network-based single-shot speckle tracking for x-ray phase-contrast imaging [PDF]
arXiv, 2023 X-ray phase-contrast imaging offers enhanced sensitivity for weakly-attenuating materials, such as breast and brain tissue, but has yet to be widely implemented clinically due to high coherence requirements and expensive x-ray optics. Speckle-based phase contrast imaging has been proposed as an affordable and simple alternative; however, obtaining high-
arxiv
Comparison of Fuzzy Filters on Synthetic Aperture Radar Image [PDF]
, 2016 The Synthetic Aperture Radar (SAR) image with its advantages is becoming more popular than the optical image in earth observation in using the remote-sensing techniques. However, the speckle noise that occurs in the SAR image causes difficulties in image
Bayuaji, Luhur +5 more
core +1 more source
Advanced Engineering Materials, EarlyView.This study explores aerosol jet‐printed (AJP) surface roughness, its effects on the performance of microwave electronics, and its process contributors. First, an electromagnetic model is vetted for AJP's unique roughness signature. Simulations are built which show process‐induced roughness is as significant as conductor resistivity in driving microwave
Christopher Areias, Alkim Akyurtlu
wiley +1 more source
Purely Speckled Intensity Images Need for SAR Despeckling with SDS-SAR [PDF]
arXiv, 2023 Speckle noise is generated along with the SAR imaging mechanism and degrades the quality of SAR images, leading to difficult interpretation. Hence, despeckling is an indispensable step in SAR pre-processing. Fortunately, supervised learning (SL) has proven to be a progressive method for SAR image despeckling.
arxiv
Stochastic Speckle Discrimination with Time-Tagged Photon Lists: Digging Below the Speckle Noise Floor [PDF]
PASP, 131, 2019, 114506, 2019 We present an algorithm that uses the distribution of photon arrival times to distinguish speckles from incoherent sources, like planets and disks, in high contrast images. Using simulated data, we show that our approach can overcome the noise limit from fluctuating speckle intensity.
arxiv +1 more source
Comparison of the estimation of the degree of polarization from four or two intensity images degraded by speckle noise [PDF]
, 2006 Active polarimetric imagery is a powerful tool for accessing the information present in a scene. Indeed, the polarimetric images obtained can reveal polarizing properties of the objects that are not avalaible using conventional imaging systems.
Roche, Muriel, Réfrégier, Philippe
core +4 more sources
Advanced Functional Materials, EarlyView.Integrating selective RNA shortcut, targeted gene isolation, and micro‐arrayed nanoimaging, the NanoPick‐array platform excels in detecting severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) at just 60 copies µL−1 and accurately differentiating variants at the single‐nucleotide level. It ensures 100% accuracy for samples with cycle threshold (
Zixun Wang +9 more
wiley +1 more source
The Signal to Noise Ratio in Speckle Interferometry [PDF]
International Astronomical Union Colloquium, 1979 AbstractRecent theoretical studies of the signal to noise ratio (SNR) of photon limited speckle (image plane) interferometry are reviewed. The SNR of an estimate of the object power spectrum is evaluated for both the single and double aperture cases, for arbitrary light levels.
J. C. Dainty, Alan H. Greenaway
openaire +2 more sources