Speckle Reduction of Reconstructions of Digital Holograms Using Gamma-Correction and Filtering
IEEE Access, 2018 Speckle noise is inevitable in the process of acquiring of digital holograms. In this paper, a new approach is proposed to suppress the speckle noise in the digital hologram.
Xiaohui Huang +4 more
doaj +1 more source
Detection of Electromagnetic Inclusions using Topological Sensitivity [PDF]
, 2016 In this article a topological sensitivity framework for far field detection of a diametrically small electromagnetic inclusion is established. The cases of single and multiple measurements of the electric far field scattering amplitude at a fixed ...
Abbas, Tasawar +3 more
core +3 more sources
Methods and Devices of Speckle-Noise Suppression (Review)
Optics and Photonics Journal, 2020 Speckles in images formed by a laser beam are interference noise arising due to coherent nature of laser radiation. As the number of projection systems using laser light sources increases, new methods and devices appear for reducing the contrast of ...
I. Kompanets, N. Zalyapin
semanticscholar +1 more source
First On-Sky High Contrast Imaging with an Apodizing Phase Plate [PDF]
, 2007 We present the first astronomical observations obtained with an Apodizing Phase Plate (APP). The plate is designed to suppress the stellar diffraction pattern by 5 magnitudes from 2-9 lambda/D over a 180 degree region. Stellar images were obtained in the
Ari Heinze +10 more
core +2 more sources
Noise-Powered Disentangled Representation for Unsupervised Speckle Reduction of Optical Coherence Tomography Images [PDF]
IEEE Transactions on Medical Imaging, 2020 Due to its noninvasive character, optical coherence tomography (OCT) has become a popular diagnostic method in clinical settings. However, the low-coherence interferometric imaging procedure is inevitably contaminated by heavy speckle noise, which ...
Yongqiang Huang +7 more
semanticscholar +1 more source
Real-Time Ultrasound Image Despeckling Using Mixed-Attention Mechanism Based Residual UNet
IEEE Access, 2020 Ultrasound imaging has been widely used for clinical diagnosis. However, the inherent speckle noise will degrade the quality of ultrasound images. Existing despeckling methods cannot deliver sufficient speckle reduction and preserve image details well at
Yancheng Lan, Xuming Zhang
doaj +1 more source
Speckle noise reduction techniques for high-dynamic range imaging [PDF]
, 2007 High-dynamic range imaging from space in the visible, aiming in particular at the detection of terrestrial exoplanets, necessitates not only the use of a coronagraph, but also of adaptive optics to correct optical defects in real time.
Belikov +23 more
core +3 more sources
Study on Speckle Noise Reduction in Laser Projection Displays
PhotonicsLaser speckle has a negative effect on laser projectors, so reducing laser speckle is crucial for the development of laser projector displays. We primarily focus on studying the laser speckle contrast of laser projector displays and the mechanism for ...
Hongyou Zhang +3 more
semanticscholar +1 more source
Denoising of Wrapped Phase in Digital Speckle Shearography Based on Convolutional Neural Network
Applied SciencesSpeckle-shearing technology is widely used in defect detection due to its high precision and non-contact characteristics. However, the wrapped-phase recording defect information is often accompanied by a lot of speckle noise, which affects the evaluation
Hao Zhang, Dawei Huang, Kaifu Wang
doaj +1 more source
Speckle noise and dynamic range in coronagraphic images [PDF]
, 2007 This paper is concerned with the theoretical properties of high contrast coronagraphic images in the context of exoplanet searches. We derive and analyze the statistical properties of the residual starlight in coronagraphic images, and describe the ...
Andre Ferrari +15 more
core +1 more source