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Speckle-Free SAR Image Ship Detection
IEEE Transactions on Image Processing, 2021Ship detection is one of important applications for synthetic aperture radar (SAR). Speckle effects usually make SAR image understanding difficult and speckle reduction becomes a necessary pre-processing step for majority SAR applications.
Siwei Chen +3 more
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Non-invasive single-shot imaging through scattering layers and around corners via speckle correlations [PDF]
Nature Photonics, 2014 Optical imaging through and inside complex samples is a difficult challenge with important applications in many fields. The fundamental problem is that inhomogeneous samples such as biological tissue randomly scatter and diffuse light, preventing the ...
Ori Katz, Mathias Fink, Sylvain Gigan
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Surface-Emitting Perovskite Random Lasers for Speckle-Free Imaging
ACS Nano, 2019 Random lasers have been ideal illumination sources for speckle-free and high-speed imaging. Despite of their successes, the real applications of random lasers are facing a long-standing challenge, i.e.
, Nan Zhang, Yubin Fan
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Ultrahigh-definition dynamic 3D holographic display by active control of volume speckle fields
Nature Photonics, 2017Hyeonseung Yu +2 more
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SAR Speckle Removal Using Hybrid Frequency Modulations
IEEE Transactions on Geoscience and Remote Sensing, 2020Synthetic aperture radar (SAR) images often interfere with speckle artifacts that have a great impact on subsequent processing and analysis operations.
Shuaiqi Liu +6 more
semanticscholar +1 more source
Hololens in speckle and speckle shear interferometry
Applied Optics, 1985This paper presents a number of methods to obtain in-plane displacement, out of plane displacement and slope data using holographic optical elements. The results obtained with a hololens and a holoshear lens are as good as those obtained with conventional optical systems.
C, Joenathan, R K, Mohanty, R S, Sirohi
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Multimode Random Fiber Laser for Speckle-Free Imaging
IEEE Journal of Selected Topics in Quantum Electronics, 2019Light sources with high radiance are increasingly required for full-field real-time imaging. Conventional lasing sources are poorly suited for such imaging due to their high spatial or temporal coherence, which generates a speckle that deteriorates image
R. Ma, Y. Rao, Wei Li Zhang, Bo Hu
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Speckle Imaging And Speckle Spectroscopy
SPIE Proceedings, 1989The atmosphere of the earth restricts the resolution of conventional astronomical imaging to about 1 arcsec. Much higher resolution can be obtained by speckle methods. The Knox-Thompson method and the speckle masking method (bispectrum or triple correlation processing) yield diffraction-limited images in spite of image degradation by the atmosphere and
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Speckle-Noise-Invariant Convolutional Neural Network for SAR Target Recognition
IEEE Geoscience and Remote Sensing Letters, 2019Speckle noise is inherent to synthetic aperture radar (SAR) images and degrades the target recognition performance. Deep learning based on convolutional neural networks (CNNs) has been widely applied for SAR target recognition, but the extracted features
Youngchul Kwak +2 more
semanticscholar +1 more source
Optics Letters, 2015
A novel spectrometer concept is analyzed and experimentally verified. The method relies on probing the speckle displacement due to a change in the incident wavelength. A rough surface is illuminated at an oblique angle, and the peak position of the covariance between the speckle patterns observed in the far field with the two wavelengths reveals the ...
Maumita, Chakrabarti +2 more
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A novel spectrometer concept is analyzed and experimentally verified. The method relies on probing the speckle displacement due to a change in the incident wavelength. A rough surface is illuminated at an oblique angle, and the peak position of the covariance between the speckle patterns observed in the far field with the two wavelengths reveals the ...
Maumita, Chakrabarti +2 more
openaire +2 more sources