George D. Sergiadis

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This paper presents a wideband printed dipole antenna element. The broad bandwidth is achieved by optimization of the feeding network, which is implemented as a microstrip tapered balun. The design is based on the double-sided flat dipole implementation. The prototype antenna exhibits a measured impedance bandwidth of 58% (VSWR<2), operating over the entire(More)
This paper presents an automated fuzziness-driven algorithm for image enhancement. A class of parametric indices of fuzziness is introduced, which serves as the optimization criterion of the contrast-enhancement procedure. We show that the parametric class of indices constitutes a one-parameter generalization of the linear index of fuzziness of a set. The(More)
We extend the mathematical analysis of previous work [M.T. Andersson, Controllable multi-dimensional filters and models in low-level computer vision, Ph. and we give rigorous, general, mathematical formulas for the construction of 3-D steerable directional cosine filters of arbitrary higher order. Furthermore , we present the mathematical analysis for the(More)
Although the motion estimation problem has been extensively studied, most of the proposed estimation approaches deal mainly with monochrome videos. The most usual way to apply them also in color image sequences is to process each color channel separately. A different, more sophisticated approach is to process the color channels in a "holistic" manner using(More)
Wireless capsule endoscopy (WCE) is a novel imaging technique that is gradually gaining ground as it enables the non-invasive and efficacious visualization of the digestive track, and especially the entire small bowel including its middle part. However, the task of reviewing the vast amount of images produced by a WCE examination is a burden for the(More)
This short comment aims at providing connections between the algorithm for image thresholding using type II fuzzy sets, recently proposed by Tizhoosh in Ref. [1], and Atanassov's in-tuitionistic fuzzy sets (A-IFSs), as well as pointing out some terminological issues. The idea of applying higher-order fuzzy sets for image thresholding discussed in Ref. [1](More)