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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"Radon Transform"”.
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Acoustic modelling of near borehole anolmalies via the generalised radon transform
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.
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Applications of the Radon transform, Stratigraphic filtering, and Object-based stochastic reservoir modeling
… studies consisting of three applications of the Radon transform, one aspect of acoustic wave propagation, and a pilot study of generating a stochastic reservoir model. The first three studies focus on the use of the Radon transform to enhance surface-recorded, controlled-source seismic data. …
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Imaging of structure at and near the core mantle boundary using a generalized radon transform
… Earth's deep interior. Specially, a generalized Radon transform (GRT) approach is developed to image heterogeneity at and near interfaces in Earth's lowermost mantle with broadband, three-component seismograms from Global Seismograph Networks (GSN). With this GRT method I transformed ~100,000 …
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Fine scale imaging of structures at and near the mantle transition zone using a generalized Radon transform
We apply a generalized Radon transform (GRT) to the study of the transition zone discontinuities. The transition zone discontinuities, e.g. the '410' and '660', result from mineral phase changes that occur at depths constrained by temperature and chemistry, and can provide information about the …
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Fast and Scalable Architectures and Algorithms for the Computation of the Forward and Inverse Discrete Periodic Radon Transform with Applications to 2D Convolutions and Cross-Correlations
The Discrete Radon Transform (DRT) is an essential component of a wide range of applications in image processing, e.g. image denoising, image restoration, texture analysis, line detection, encryption, compressive sensing and reconstructing objects from projections in computed tomography and …
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Digital image processing of orbital synthetic aperture radar
… for the selected technique, namely the Radon transform. A transputer network is described in detail, together with OCCAM software to perform the Radon transform within a few seconds. The Radon transform, performed via the two-dimensional frequency domain, uses a technique based on the …
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New algorithms for image analysis, compression, and 2-D spectrum estimation in the radon space
… signal/image processing algorithms involving the Radon transform are presented. Algorithms that address computed tomography (CT) are motivated by the desire to process within the Radon space, instead of post-processing a reconstructed image. Algorithms that use the Radon transform as a tool, …
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AUTOMATED CURVED HAIR DETECTION AND REMOVAL IN SKIN IMAGES TO SUPPORT AUTOMATED MELANOMA DETECTION
… within a binary image mask using the Generalized Radon Transform. The Radon Transform was adapted to find quadratic curves characterized by rotational angle and scaling. The method detects curved hairs in the image mask for removal and replacement through pixel interpolation. Implementing this …
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Geometry of cone-beam reconstruction
… data to some intermediate functions in the Radon transform domain. However, the essential step towards final reconstruction, that is, differential-backprojection, has not yet achieved desired efficiency. A new inversion formula is obtained directly from the 3D Radon inverse [Radon, 1917, …
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Using the Hough transform for analysis of images containing straight lines
The Hough transform is a means for finding straight lines in an image. Since it is robust and efficient it is widely used in machine vision systems. The Hough transform has been shown to be a special case of the Radon transform. As a result, the Hough transform can be inverted using the inverse …
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Detection and Localization of Linear Features Based on Image Processing Methods
… the orientation detection of lines, utilized the Radon transform (sinogram) of an image to detect lines at different angles in an image. The line thickness algorithm was generated by finding a pattern formed by particular lines in an image. The filtering of reconstructed images dealt with the …
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A 500kHz-5MHz CW stepped frequency borehole tomographic imaging system
… The mathematical physical models of the Radon Transform are reviewed. The entire Cross-Borehole Tomographic process is simulated, based on these physical models of the Radon Transform. The system specifications for the final design are based on the results from the simulation. Finally, …
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ROAD : Rapid Optical Asteroid Detection
… present Tilt and the Three-Dimensional Discrete Radon Transform (3DRT), efficient image processing algorithms capable of identifying streaks at the detection limit in video of the night sky. Tilt and the 3DRT are asymptotically optimal algorithms for the blind search problem, which seeks to …
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Theory and applications of a functional from metric geometry
… formula is proved using the Fourier transform and tempered distributions. Ideas from integral geometry are used to apply the functional $J\sp\alpha$ to irregularities of distribution, and estimates of discrepancy are obtained for measures that do not have atoms. Finally, the close …
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Curvature Detection by Integral Transforms
… We first examine the properties of the parabolic Radon transform and show that it can be used to detect the edge curvature, as the smoothness of the parabolic Radon transform changes when the parabola is tangential to an edge and also, when additionally the curvature of the parabola coincides with …
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Doppler-only synthetic aperture radar
… data, a sinogram, is equivalent to taking the Radon transform of the target. The Fourier transform of the sinogram from each perspective (at an angle eÌ ) gives a slice of the two-dimensional transform subtending an angle eÌ with the axis, with equally distributed points along the line. This …
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Multilinear operators in harmonic analysis: Methods and applications
We first give a survey on multilinear Hilbert transforms. Then we study several variants of bilinear Hilbert transform such as bilinear Hilbert transform along two polynomials, discrete (integer) bilinear Hilbert transform along polynomials, finite field version of bilinear Radon transform, a …
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Multicomponent seismic data analysis in the tau-p domain
… data. I develop two versions of the discrete Radon transform (DRT) pair, a generalization of slant stacking, which can handle data unevenly spaced in both offset (x) and ray parameter (p). The discrete Radon transform matrix consists of two parts: a scaling matrix and a phase shift matrix. The …
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Machine vision system developments for industrial inspection applications
… a pellet tray image by a novel system using the Radon transform coupled with data clustering. Subsequent to the segmentation, the linking of four pellet views depicting the entire circumferential area of the pellet is described along with a simple technique to compensate for intensity variations …
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