Results 341 to 350 of about 237,317 (388)
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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
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Clinical and Experimental Dermatology, 1990
We report a case of a localized speckled compound naevus arising within normally pigmented skin. Speckled melanocytic naevi are reviewed and the distinctive features of the case enumerated.
A J, Carmichael, C Y, Tan
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We report a case of a localized speckled compound naevus arising within normally pigmented skin. Speckled melanocytic naevi are reviewed and the distinctive features of the case enumerated.
A J, Carmichael, C Y, Tan
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Subfeature speckle interferometry
Optics Letters, 1995A novel speckle technique, subfeature speckle interferometry, is introduced that relies on the amplitude interference of two independent speckle patterns, originating from coherent illumination, by use of an optical system that produces interferometric quality interference fringes on a scale comparable with the speckle correlation length.
D, Burckel +4 more
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Paired correlation speckles and speckle moire
Annual Meeting Optical Society of America, 1987The mechanism of moire specklegram is explained in theory by the concept of paired correlation speckles.
Duomin He, Zhishen Liu
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Speckle photography combined with speckle interferometry
Optics and Lasers in Engineering, 2004By combining speckle interferometry (SI) measurements with speckle photography, the fringe visibility can be kept high despite the presence of a large bulk or rotating motion of the object. This combined technique improves the usability and measuring range of both pulsed and phase-stepped SI-methods. This paper reviews the theory of fringe formation in
N.-E. Molin +3 more
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Applied Optics, 1986
A computer-based method is developed to measure the out-of-plane motion of a surface which might arise, for example, from the deflection of a structural component or as a result of contouring a 3-D surface with respect to a reference plane. Artificial speckles are projected onto the test surface using an ordinary 35-mm projector equipped with a clear ...
J A, Gilbert +3 more
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A computer-based method is developed to measure the out-of-plane motion of a surface which might arise, for example, from the deflection of a structural component or as a result of contouring a 3-D surface with respect to a reference plane. Artificial speckles are projected onto the test surface using an ordinary 35-mm projector equipped with a clear ...
J A, Gilbert +3 more
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Optics Letters, 2018
In this Letter, we propose a fast speckle noise reduction method with only a single reconstructed image based on convolutional neural networks. The proposed network has multi-sized kernels that can capture the speckle noise component effectively from ...
Wonseok Jeon +3 more
semanticscholar +1 more source
In this Letter, we propose a fast speckle noise reduction method with only a single reconstructed image based on convolutional neural networks. The proposed network has multi-sized kernels that can capture the speckle noise component effectively from ...
Wonseok Jeon +3 more
semanticscholar +1 more source
Physics in Medicine and Biology, 1989
It is demonstrated that the instantaneous frequency of a backscattered echo sequence can be used to pinpoint the location of destructive interference effects. These interference artefacts, which are generally interpreted as speckle in the image, are generally removed by stochastic averaging or filtering methods applied to the acquired image. The method
J C, Gatenby, J C, Hoddinott, S, Leeman
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It is demonstrated that the instantaneous frequency of a backscattered echo sequence can be used to pinpoint the location of destructive interference effects. These interference artefacts, which are generally interpreted as speckle in the image, are generally removed by stochastic averaging or filtering methods applied to the acquired image. The method
J C, Gatenby, J C, Hoddinott, S, Leeman
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Optics Letters, 1997
We report on a new laser feedback mechanism that uses speckle-pattern phenomena to create highly dispersive feedback. This speckle mirror is capable of creating laser emission as narrow as that from laser cavities using a number of dispersive elements such as gratings and prisms.
P C, de Oliveira +2 more
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We report on a new laser feedback mechanism that uses speckle-pattern phenomena to create highly dispersive feedback. This speckle mirror is capable of creating laser emission as narrow as that from laser cavities using a number of dispersive elements such as gratings and prisms.
P C, de Oliveira +2 more
openaire +2 more sources