Laser speckle reduction using polymer-stabilized liquid crystals doped with Ag nanowires [PDF]
Heliyon, 2023 Miniaturized and pure static devices are expected to be used in laser-imaging systems for speckle reduction. In this study, a pure static device based on polymer-stabilized liquid crystal (PSLC) doped with Ag nanowires was developed to effectively ...
Xin Jiang +4 more
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Enhancing laser speckle reduction by decreasing the pitch of a chiral nematic liquid crystal diffuser [PDF]
Scientific Reports, 2021 The artefact known as speckle can plague numerous imaging applications where the narrow linewidth of laser light is required, which includes laser projection and medical imaging.
David J. Hansford +3 more
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Polychromatic speckle reduction in laser pico-projectors using stationary dual Hadamard diffusers [PDF]
Journal of the European Optical Society-Rapid Publications, 2014 Speckle from coherent light sources continues to be a limiting factor in the design and manufacturing of laser projectors. Utilizing diffractive diffusers has been an effective method for reducing monochromatic speckle contrast.
Thomas W., Middlebrook C.
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Laser speckle reduction based on angular diversity induced by Piezoelectric Benders [PDF]
Journal of the European Optical Society-Rapid Publications, 2013 Speckle reduction techniques have been investigated in display systems with coherent light sources. We propose a simple but efficient method to reduce speckle via two fast vibrating piezoelectric benders.
Ouyang G. +4 more
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Speckle reduction using phase plate array and lens array
Opto-Electronic Advances, 2020 In this paper, a solution for speckle reduction using phase plate array (PPA) and lens array (LA) in a motionless way is proposed. The specially designed PPA is composed of sub-phase plates, which are constituted by phase patterns formed by Hadamard sub ...
Xiaohui Ma +4 more
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DeepLSR: a deep learning approach for laser speckle reduction [PDF]
Biomedical Optics Express, 2019 Faisal Mahmood +2 more
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IEEE Access, 2021 The speckle phenomenon produced by coherent waves interfering with each other is undesirable in laser imaging systems. For each of the laser speckle reduction methods in the literature, it is difficult to reduce speckle to an extremely low level (<
Jun Zhou +6 more
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A novel wavelet thresholding rule for speckle reduction from ultrasound images
Journal of King Saud University: Computer and Information Sciences, 2022 The speckle noise is the major area of concern in ultrasound imaging. Speckle degrades the speed and accuracy of subsequent image processing tasks such as segmentation, description etc.
Leena Jain, Palwinder Singh
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NON-LOCAL MEANS FILTER FOR POLARIMETRIC SAR SPECKLE REDUCTION-EXPERIMENTS USING TERRASAR-X DATA [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015 The speckle is omnipresent in synthetic aperture radar (SAR) images as an intrinsic characteristic. However, it is unwanted in certain applications. Therefore, intelligent filters for speckle reduction are of great importance. It has been demonstrated in
J. Hu, R. Guo, X. Zhu, G. Baier, Y. Wang
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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.
Hosung Jeon, Joonku Hahn
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