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SAR can penetrate clouds and precipitation and can provide accurate observations of surface features such as fronts and localized coastal marine winds. Often atmosphere-ocean interaction processes evident in SAR imagery are not present from in situ observations, the operational network, weather prediction models, or scatterometer data, especially in complex coastal areas. Timely, high-resolution SAR-derived...
For a long while, launching satellites for the purpose of research and technology demonstration largely remained with national space agencies and government organizations as the huge funding requirements inhibited the initiation of such projects at university level. It was this idea of providing, at university level, cheap access to space that prompted the design of miniaturized versions of satellites...
Ant colony optimization (ACO), inspired by the ants' foraging behavior, is one of the most recent techniques for solving optimization problems. We present an ACO based algorithm for symbol detection in multi-input multi-output (MIMO) system. Since symbol detection is an NP-hard problem so ACO is particularly attractive as ACO algorithms are one of the most successful strands of swarm intelligence...
Computed tomography (CT) is used for the attenuation correction of positron emission tomography (PET) to enhance the efficiency of data acquisition process and to improve the quality of the reconstructed PET data in the brain. Due to the use of two different modalities, chances of misalignment between PET and CT images are quite significant. The main cause of this misregistration is the motion of...
We present a method for figure caption detection by employing a fusion of several information sources. The evaluation is performed on documents gathered from the collection of the historical medical digital library Medic@. A method based on perceptual grouping simultaneously segments the vertical and horizontal text lines in a page. Spatial relationships between the text lines and the graphics are...
An effective yet simple approach for text-dependent speaker verification is presented in this paper. The basic idea employs the fundamentals of Gaussian Mixture Model, which is a popular technique for speaker recognition in modern state-of-the- art systems. In this paper we introduce a novel technique for creating unique speaker models using spectral and prosodic features of speech signals which are...
An efficient approach for noise suppression in speech is presented in this paper. The basic idea is taken from signal subspace analysis, which is employed for noise reduction in speech. Different other subspace approaches assumed the estimation of noise from the initial silence or unvoiced portion of the speech signal and the noise was considered to be same and present throughout the signal. The problem...
Computed tomography (CT) is used for the attenuation correction of positron emission tomography (PET) to enhance the efficiency of data acquisition process but due to the use of two different modalities chances of misalignment between PET and CT images are quite significant. There are multiple causes of this misalignment, the most important being the respiratory motion of the patient. The position...
Planar ultrasound (US) phased arrays with square element are easier to fabricate and model than other concave shaped phased arrays. Combined with phases derived for single spot focusing, the sector-vortex phase scheme can be applied to the square planar array to generate a vortex shaped pressure field that can be controlled by the mode number M. Increasing the mode number M also increases the diameter...
Alignment of PET and CT images is essential for accurate measurements of cardiac perfusion. Misalignment can produce an erroneous attenuation map that projects lung attenuation parameters onto the heart wall, thereby underestimating the attenuation, and creating artifactual areas of hypoperfusion which may be misinterpreted as myocardial ischemia or infarction. The main cause of misregistration between...
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