Results 31 to 40 of about 143,665 (236)
Anti-interference Computational Ghost Imaging with Pink Noise Speckle Patterns [PDF]
Phys. Rev. A 104, 013513 (2021), 2020 We propose a computational ghost imaging scheme using customized pink noise speckle pattern illumination. By modulating the spatial frequency amplitude of the speckles, we generate speckle patterns with a significant positive spatial correlation. We experimentally reconstruct images using our synthesized speckle patterns in the presence of a variety of
arxiv +1 more source
Rayleigh-maximum-likelihood bilateral filter for ultrasound image enhancement
BioMedical Engineering OnLine, 2017 Background Ultrasound imaging plays an important role in computer diagnosis since it is non-invasive and cost-effective. However, ultrasound images are inevitably contaminated by noise and speckle during acquisition. Noise and speckle directly impact the
Haiyan Li +5 more
doaj +1 more source
Fire, 2023 The temperature field and chemiluminescence measurements of axisymmetric flame are obtained simultaneously in only one image. Digital Laser Speckle Displacement measures temperature fields, and direct image flame determines chemiluminescence values ...
J. C. I. Zamarripa-RamÃrez +2 more
doaj +1 more source
Exoplanet detection with simultaneous spectral differential imaging: effects of out-of-pupil-plane optical aberrations [PDF]
, 2006 Imaging faint companions (exoplanets and brown dwarfs) around nearby stars is currently limited by speckle noise. To efficiently attenuate this noise, a technique called simultaneous spectral differential imaging (SSDI) can be used.
Macintosh, Bruce +2 more
core +2 more sources
Noise analysis in outdoor dynamic speckle measurement
Applied Optics, 2023 The dynamic speckle method (DSM) is an effective tool for the estimation of speed of processes. The speed distribution is encoded in a map built by statistical pointwise processing of time-correlated speckle patterns. For industrial inspection, the outdoor noisy measurement is required.
Mikhail Levchenko +6 more
openaire +4 more sources
Deep Learning-Based Ultrasound Image Despeckling by Noise Model Estimation [PDF]
Iranian Journal of Electrical and Electronic Engineering, 2023 Speckle noise is an inherent artifact appearing in medical images that significantly lowers the quality and accuracy of diagnosis and treatment.
O. Mahmoudi Mehr +2 more
doaj
Wavelet domain compounding for speckle reduction in optical coherence tomography [PDF]
, 2013 Visibility of optical coherence tomography (OCT) images can be severely degraded by speckle noise. A computationally efficient despeckling approach that strongly reduces the speckle noise is reported.
Chui, PC +6 more
core +1 more source
The Mysterious Lives Of Speckles. I. Residual atmospheric speckle lifetimes in ground-based coronagraphs [PDF]
, 2021 High-contrast imaging observations are fundamentally limited by the spatially and temporally correlated noise source called speckles. Suppression of speckle noise is the key goal of wavefront control and adaptive optics (AO), coronagraphy, and a host of post-processing techniques.
arxiv +1 more source
A Study of Speckle Noise Reduction Filters
Signal & Image Processing : An International Journal, 2015 Ultrasound images and SAR i.e. synthetic aperture radar images are usually corrupted because of speckle noise also called as granular noise. It is quite a tedious task to remove such noise and analyze those corrupted images. Till now many researchers worked to remove speckle noise using frequency domain methods, temporal methods, and adaptive methods ...
Jyoti Jaybhay, Rajveer Shastri
openaire +1 more source
Introducing speckle noise maps for laser vibrometry [PDF]
, 2008 When coherent light scatters from a surface, which is rough on the scale of the wavelength of the light, a speckle pattern is produced. The Laser Vibrometer measures target vibration velocity in the direction of the incident laser beam and typically ...
Peter Martin (306678) +1 more
core +1 more source