Results 21 to 30 of about 1,068,113 (278)
Numerical simulation of speckle noise in laser vibrometry [PDF]
Applied Optics, 2006 The fundamental mechanism by which speckle noise is generated in laser vibrometry before describing a new numerical simulation for prediction of speckle noise level in a real measurement is considered. Factors within the simulation include rate of change of phase within individual speckle transitions, low-pass filtering to match the frequency range of ...
Steve Rothberg
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Intrinsic speckle noise in in-line particle holography due to poly-disperse and continuous particle sizes [PDF]
, 2000 In-line particle holography is subject to image deterioration due to intrinsic speckle noise. The resulting reduction in the signal to noise ratio (SNR) of the replayed image can become critical for applications such as holographic particle velocimetry ...
Rodgers, GJ, Edwards, PJ, Hobson, PR
core +6 more sources
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023 Deep-learning-based on convolutional neural networks (CNN) has been widely applied in synthetic aperture radar (SAR) target recognition and made significant progress.
Yikui Zhai +8 more
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SSN2V: unsupervised OCT denoising using speckle split
Scientific Reports, 2023 Denoising in optical coherence tomography (OCT) is important to compensate the low signal-to-noise ratio originating from laser speckle. In recent years learning algorithms have been established as the most powerful denoising approach.
Julia Schottenhamml +6 more
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Compressed Sensing in the Presence of Speckle Noise
IEEE Transactions on Information Theory, 2022 The problem of recovering a structured signal from its linear measurements in the presence of speckle noise is studied. This problem appears in many imaging systems such as synthetic aperture radar and optical coherence tomography. The current acquisition technology oversamples signals and converts the problem into a denoising problem with ...
Wenda Zhou, Shirin Jalali, Arian Maleki
openaire +4 more sources
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
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Edge Enhancing Accelerated Diffusion Model for Speckle Denoising in Medical Imagery [PDF]
ITM Web of Conferences, 2019 Speckle noise occurs in a wide range of medical images due to sampling and digital degradation. Removing speckle noise from medical images is the key for further automated processing techniques like segmentation, and can help the clinicians with better ...
Bagchi Misra Arundhati +2 more
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Reduction of Multiplicative Noise in Radar Images
Известия высших учебных заведений России: Радиоэлектроника, 2021 Introduction. A radar image is an image obtained by remote sensing the earth's surface with a radar device. Radar images are characterized by background graininess caused by speckle noise, which should be filtered to improve the quality of radar images ...
A. A. Tuzova, V. A. Pavlov, A. A. Belov
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Signal diversity for the reduction of signal dropouts and speckle noise in a laser-Doppler extensometer [PDF]
, 2022 A recently demonstrated laser-Doppler extensometer is affected by signal dropouts caused by speckle noise, whereby the carrier-to-noise ratio (C/N) falls below the so-called frequency-modulation threshold.
Fangjian Wang +2 more
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Entropy Based Parameter Estimation of 2D Gaussian Filter for Image Speckle Noise Removal [PDF]
AUT Journal of Electrical Engineering, 2021 In this paper, a speckle noise suppression algorithm based on the 2D Gaussian filter is addressed, which employs entropy to estimate the filter's variance effectively.
Zahra Hosseini +1 more
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