Results 1 to 10 of about 52,858 (287)
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
doaj +2 more sources
Speckle Reduction Using Multiple Tones of Illumination [PDF]
Applied Optics, 1973 The occurrence and smoothing of speckle are studied as a function of the line width for a highly collimated illuminating source. A general theory is presented for speckling in the image of a partially diffuse, phase type of object, which has a variable number of random scattering centers per resolution element.
George, Nicholas, Jain, Atul
openaire +5 more sources
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
doaj +1 more source
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
doaj +1 more source
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.
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Speckle Noise Removal for Synthetic Aperture Radar Imagery Based on Statistics Filters and Nonlinearing Function [PDF]
Engineering and Technology Journal, 2012 Synthetic Aperture Radar (SAR) images are contaminated by multiplicative noise, due to the coherence of the radar wavelength, labeled as speckle noise which results in an important reduction in the efficiency of target detection and classification ...
E kbal H. Ali
doaj +1 more source
Open Computer Science, 2021 Ultrasonography is an extensively used medical imaging technique for multiple reasons. It works on the basic theory of echoes from the tissues under consideration.
Dilna Kaitheri Thacharedath +1 more
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.
Hosung Jeon, Joonku Hahn
doaj +1 more source