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
Monitoring spatially heterogeneous dynamics in a drying colloidal thin film [PDF]
, 2010 We report on a new type of experiment that enables us to monitor spatially and temporally heterogeneous dynamic properties in complex fluids. Our approach is based on the analysis of near-field speckles produced by light diffusely reflected from the ...
Berne B.J. +8 more
core +2 more sources
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
On-sky speckle nulling demonstration at small angular separation with SCExAO [PDF]
, 2014 This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project.
Clergeon, Christophe +9 more
core +5 more sources
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-Free Interconnective Holographic Projection
Photonics, 2022 Generally, speckle noise is regarded as unavoidable in holographic projection, and it results from unexpected high spatial frequency components of diffracted light at the sharp edge of pixel openings in a spatial light modulator. Speckle noise typically reduces image contrast and degrades the image quality of the holographic projection.
Hosung Jeon, Joonku Hahn
openaire +2 more sources
Physical pupil manipulation for speckle reduction in digital holographic microscopy
Heliyon, 2021 The reduction of speckle noise by physically changing the pupil of the imaging system, as first envisioned in optical holography, is experimentally applied to a digital holographic microscope (DHM).
Carlos Buitrago-Duque +1 more
doaj +1 more source
Real Time Speckle Image De-Noising
, 2014 The paper presents real time speckle de-noising based on activity computation algorithm and wavelet transform. Speckles arise in an image when laser light is reflected from an illuminated surface. The process involves detection of speckles in an image by obtaining a number of frames of the same object under different illumination or angle and comparing
Kumar, D. Sachin +3 more
openaire +2 more sources
Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization
IEEE Access, 2020 Speckle noise in digital holography has a great influence on image quality, and one of the reasons for the formation of speckle noise is that the degree of coherence for the reference light and the object light is too high and unnecessary noise is ...
Tongyao Du +4 more
doaj +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