Results 31 to 40 of about 1,068,113 (278)
Non-Local SAR Image Despeckling Based on Sparse Representation
Remote Sensing, 2023 Speckle noise is an inherent problem of synthetic aperture radar (SAR) images, which not only seriously affects the acquisition of SAR image information, but also greatly reduces the efficiency of image segmentation and feature classification. Therefore,
Houye Yang, Jindong Yu, Zhuo Li, Ze Yu
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Speckle Decorrelation and Dynamic Range in Speckle Noise–limited Imaging [PDF]
The Astrophysical Journal, 2002 The useful dynamic range of an image in the diffraction limited regime is usually limited by speckles caused by residual phase errors in the optical system forming the image. The technique of speckle decorrelation involves introducing many independent realizations of additional phase error into a wavefront during one speckle lifetime, changing the ...
Sivaramakrishnan, Anand +3 more
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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-Ramírez +2 more
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Use of diffuse reflections in tunable diode laser spectroscopy [PDF]
, 2009 Tunable diode laser absorption spectroscopy (TDLAS) is an optical gas sensing technique in which the emission frequency of a laser diode is tuned over a gas absorption line of interest.
Masiyano, Dackson
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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
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Speckle Suppression Using Cylindrical Self-Diffraction for Cylindrical Phase-Only Hologram
IEEE Photonics Journal, 2021 In the reconstruction of cylindrical phase-only hologram (POH), speckle noise caused by the addition of random phase is rarely discussed. Although some speckle noise suppression algorithms have been proposed for planar POH, it does not work well if they ...
Feng-Ming Jin +5 more
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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
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Heliyon, 2023 Optical coherence tomography (OCT) imaging is a technique that is frequently used to diagnose medical conditions. However, coherent noise, sometimes referred to as speckle noise, can dramatically reduce the quality of OCT images, which has an adverse ...
Ying Fang +3 more
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Robustness Research of Center Coordinate Value for Speckle Contour and Denoising Algorithm Implementation [PDF]
Zhengzhou Daxue xuebao. Gongxue ban, 2021 The combination of monocular vision and laser spot could measure the depth information.The laser spot was irradiated on the surface of the object to be measured,after imaging by CCD camera,it would be generally elliptical spot,the accuracy of the ...
Zhu Xinglong +3 more
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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
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