Anastasia Papastergiou

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A method is presented for the compression of biomedical images using in place of the discrete cosine transform (DCT) the discrete orthogonal Gauss-Hermite transform (DOGHT). The latter expands the signals on a basis of Gauss-Hermite functions instead of the cosine functions and leads, in many practical cases, to 2-3 times better compression for the same(More)
Muscle biopsy image morphometric analysis provides valuable diagnostic information to expert clinicians. Subsequently, there is an indispensable need to support muscle fiber morphometry with computer-aided automated systems that require no user interaction. The first step towards producing such a system is the automated border detection of muscle fibers.(More)
In this paper a web-based information retrieval system is presented for handling dermoscopic melanoma images and associated medical data, in order to provide an effective diagnostic support tool for medical scientists in the sensitive field of melanoma cases. The proposed system is semantic web-based and is driven by exploiting the combination of AJAX(More)
Magnetoencephalographic (MEG) recordings of patients with CNS disorders were obtained using a whole-head 122-channel magnetometer SQUID and analyzed using Fourier statistical analysis. External transcranial magnetic stimulation in the order of pico Tesla (pTMS) was applied to the above patients with proper characteristics (magnetic intensity 1-7.5 pT;(More)
Early diagnosis is the most reliable solution for an effective treatment of melanoma. There is an ongoing research effort to develop computer aided imaging tools and functional content-based image retrieval systems as diagnostic support to dermatologists. Following this spirit, a Topic Map based management and retrieval system for melanoma images has been(More)
An optimal design of a linear antenna array is presented. The antenna array is optimized using a particle swarm optimization based method in order to produce a radiation pattern that has the minimum possible side lobe level and the maximum possible gain at the desired direction. The method has been applied to collinear wire-dipole arrays and seems to be(More)
An optimal design of a linear antenna array is presented. The antenna array is optimized under the restriction of uniform excitation distribution using a particle swarm optimization based method. The optimization procedure is applied under the requirements for the minimum possible side lobe level and the maximum possible power gain at the desired direction.(More)
Prompt diagnosis is the most reliable solution for an effective treatment of melanoma. There is an ongoing research for providing computer-aided imaging tools in order to support the early detection and diagnosis of malignant melanomas. The first step towards producing such a diagnosis system is the automated and accurate boundary detection of skin lesion.(More)