منابع مشابه
Sparsity driven ultrasound imaging.
An image formation framework for ultrasound imaging from synthetic transducer arrays based on sparsity-driven regularization functionals using single-frequency Fourier domain data is proposed. The framework involves the use of a physics-based forward model of the ultrasound observation process, the formulation of image formation as the solution of an associated optimization problem, and the sol...
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This paper presents a survey of recent research on sparsity-driven synthetic aperture radar (SAR) imaging. In particular, it reviews (i) analysis and synthesis-based sparse signal representation formulations for SAR image formation together with the associated imaging results; (ii) sparsity-based methods for wide-angle SAR imaging and anisotropy characterization; (iii) sparsity-based methods fo...
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In synthetic aperture radar (SAR) imaging, sparsity-driven imaging techniques have been shown to provide high resolution images with reduced sidelobes and reduced speckle, by allowing the incorporation of prior information about the scene into the problem. Just like many common SAR imaging methods, these techniques also assume the targets in the scene are stationary over the data collection int...
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Pulse-echo ultrasonography aims at imaging tissues using an array of piezoelectric elements by transmitting ultrasound (US) pulses and receiving backscattered echoes. Retrieving the image from the received signals can be mathematically formulated as an ill-posed inverse problem. Conventional realtime image reconstruction methods rely on delay-and-sum (DAS) beamforming, which recovers a relative...
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In this study, a novel weighted ensemble classifier that improves classification accuracy and minimizes the number of classifiers is proposed. Proposed method uses sparsity techniques therefore it is named sparsity-driven weighted ensemble classifier (SDWEC). In SDWEC, ensemble weight finding problem is modeled as a cost function with following terms: (a) a data fidelity term aiming to decrease...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 2012
ISSN: 0001-4966
DOI: 10.1121/1.3675002